[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Andrew Purtell updated HBASE-18451:
---
Fix Version/s: (was: 1.5.0)
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: Xu Cang
>Priority: Major
> Fix For: 3.0.0, 1.3.3, 2.2.0, 1.4.8, 2.1.1
>
> Attachments: HBASE-18451.branch-1.001.patch,
> HBASE-18451.branch-1.002.patch, HBASE-18451.branch-1.002.patch,
> HBASE-18451.master.002.patch, HBASE-18451.master.003.patch,
> HBASE-18451.master.004.patch, HBASE-18451.master.004.patch,
> HBASE-18451.master.patch
>
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flu
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Andrew Purtell updated HBASE-18451:
---
Fix Version/s: 1.3.3
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: Xu Cang
>Priority: Major
> Fix For: 3.0.0, 1.5.0, 1.3.3, 2.2.0, 1.4.8, 2.1.1
>
> Attachments: HBASE-18451.branch-1.001.patch,
> HBASE-18451.branch-1.002.patch, HBASE-18451.branch-1.002.patch,
> HBASE-18451.master.002.patch, HBASE-18451.master.003.patch,
> HBASE-18451.master.004.patch, HBASE-18451.master.004.patch,
> HBASE-18451.master.patch
>
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush o
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Andrew Purtell updated HBASE-18451:
---
Resolution: Fixed
Hadoop Flags: Reviewed
Fix Version/s: 2.1.1
1.4.8
2.2.0
1.5.0
3.0.0
Status: Resolved (was: Patch Available)
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: Xu Cang
>Priority: Major
> Fix For: 3.0.0, 1.5.0, 2.2.0, 1.4.8, 2.1.1
>
> Attachments: HBASE-18451.branch-1.001.patch,
> HBASE-18451.branch-1.002.patch, HBASE-18451.branch-1.002.patch,
> HBASE-18451.master.002.patch, HBASE-18451.master.003.patch,
> HBASE-18451.master.004.patch, HBASE-18451.master.004.patch,
> HBASE-18451.master.patch
>
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after r
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Xu Cang updated HBASE-18451:
Attachment: HBASE-18451.master.004.patch
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: Xu Cang
>Priority: Major
> Attachments: HBASE-18451.branch-1.001.patch,
> HBASE-18451.branch-1.002.patch, HBASE-18451.branch-1.002.patch,
> HBASE-18451.master.002.patch, HBASE-18451.master.003.patch,
> HBASE-18451.master.004.patch, HBASE-18451.master.004.patch,
> HBASE-18451.master.patch
>
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae.
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Xu Cang updated HBASE-18451:
Attachment: HBASE-18451.branch-1.002.patch
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: Xu Cang
>Priority: Major
> Attachments: HBASE-18451.branch-1.001.patch,
> HBASE-18451.branch-1.002.patch, HBASE-18451.branch-1.002.patch,
> HBASE-18451.master.002.patch, HBASE-18451.master.003.patch,
> HBASE-18451.master.004.patch, HBASE-18451.master.patch
>
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit s
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Xu Cang updated HBASE-18451:
Attachment: HBASE-18451.master.004.patch
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: Xu Cang
>Priority: Major
> Attachments: HBASE-18451.branch-1.001.patch,
> HBASE-18451.branch-1.002.patch, HBASE-18451.branch-1.002.patch,
> HBASE-18451.master.002.patch, HBASE-18451.master.003.patch,
> HBASE-18451.master.004.patch, HBASE-18451.master.patch
>
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Xu Cang updated HBASE-18451:
Attachment: HBASE-18451.branch-1.002.patch
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: Xu Cang
>Priority: Major
> Attachments: HBASE-18451.branch-1.001.patch,
> HBASE-18451.branch-1.002.patch, HBASE-18451.master.002.patch,
> HBASE-18451.master.003.patch, HBASE-18451.master.patch
>
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 35390ms
> 2017-07-24 18:4
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Xu Cang updated HBASE-18451:
Attachment: HBASE-18451.master.003.patch
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: Xu Cang
>Priority: Major
> Attachments: HBASE-18451.branch-1.001.patch,
> HBASE-18451.master.002.patch, HBASE-18451.master.003.patch,
> HBASE-18451.master.patch
>
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 35390ms
> 2017-07-24 18:45:33,362 INFO
> org.apache.hadoop
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Xu Cang updated HBASE-18451:
Attachment: HBASE-18451.branch-1.001.patch
HBASE-18451.master.002.patch
Status: Patch Available (was: Open)
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: Xu Cang
>Priority: Major
> Attachments: HBASE-18451.branch-1.001.patch,
> HBASE-18451.master.002.patch, HBASE-18451.master.patch
>
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Andrew Purtell updated HBASE-18451:
---
Status: Open (was: Patch Available)
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Priority: Major
> Attachments: HBASE-18451.master.patch
>
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 35390ms
> 2017-07-24 18:45:33,362 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
>
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
nihed mbarek updated HBASE-18451:
-
Status: Open (was: Patch Available)
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: nihed mbarek
> Attachments: HBASE-18451.master.patch
>
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 35390ms
> 2017-07-24 18:45:33,362 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
nihed mbarek updated HBASE-18451:
-
Status: Patch Available (was: Open)
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: nihed mbarek
> Attachments: HBASE-18451.master.patch
>
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 35390ms
> 2017-07-24 18:45:33,362 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
nihed mbarek updated HBASE-18451:
-
Status: Open (was: Patch Available)
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: nihed mbarek
> Attachments: HBASE-18451.master.patch
>
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 35390ms
> 2017-07-24 18:45:33,362 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
nihed mbarek updated HBASE-18451:
-
Attachment: HBASE-18451.master.patch
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: nihed mbarek
> Attachments: HBASE-18451.master.patch
>
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 35390ms
> 2017-07-24 18:45:33,362 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
nihed mbarek updated HBASE-18451:
-
Status: Patch Available (was: Open)
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: nihed mbarek
> Attachments: HBASE-18451.master.patch
>
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 35390ms
> 2017-07-24 18:45:33,362 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
nihed mbarek updated HBASE-18451:
-
Attachment: (was: HBASE-18451.master.patch)
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: nihed mbarek
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 35390ms
> 2017-07-24 18:45:33,362 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
nihed mbarek updated HBASE-18451:
-
Status: Open (was: Patch Available)
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: nihed mbarek
> Attachments: HBASE-18451.master.patch
>
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 35390ms
> 2017-07-24 18:45:33,362 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
nihed mbarek updated HBASE-18451:
-
Status: Patch Available (was: Open)
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: nihed mbarek
> Attachments: HBASE-18451.master.patch
>
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 35390ms
> 2017-07-24 18:45:33,362 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
nihed mbarek updated HBASE-18451:
-
Status: Open (was: Patch Available)
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: nihed mbarek
> Attachments: HBASE-18451.master.patch
>
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 35390ms
> 2017-07-24 18:45:33,362 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
nihed mbarek updated HBASE-18451:
-
Attachment: (was: ISSUE.patch)
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: nihed mbarek
> Attachments: HBASE-18451.master.patch
>
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 35390ms
> 2017-07-24 18:45:33,362 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
>
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
nihed mbarek updated HBASE-18451:
-
Status: Patch Available (was: Open)
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: nihed mbarek
> Attachments: HBASE-18451.master.patch
>
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 35390ms
> 2017-07-24 18:45:33,362 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
nihed mbarek updated HBASE-18451:
-
Attachment: HBASE-18451.master.patch
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: nihed mbarek
> Attachments: HBASE-18451.master.patch
>
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 35390ms
> 2017-07-24 18:45:33,362 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
nihed mbarek updated HBASE-18451:
-
Status: Patch Available (was: Open)
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: nihed mbarek
> Attachments: ISSUE.patch
>
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 35390ms
> 2017-07-24 18:45:33,362 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of te
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
nihed mbarek updated HBASE-18451:
-
Attachment: ISSUE.patch
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: nihed mbarek
> Attachments: ISSUE.patch
>
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 35390ms
> 2017-07-24 18:45:33,362 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
nihed mbarek updated HBASE-18451:
-
Status: Open (was: Patch Available)
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: nihed mbarek
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 35390ms
> 2017-07-24 18:45:33,362 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
nihed mbarek updated HBASE-18451:
-
Attachment: (was: ISSUE.patch)
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: nihed mbarek
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 35390ms
> 2017-07-24 18:45:33,362 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
nihed mbarek updated HBASE-18451:
-
Status: Patch Available (was: In Progress)
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: nihed mbarek
> Attachments: ISSUE.patch
>
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 35390ms
> 2017-07-24 18:45:33,362 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flus
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
nihed mbarek updated HBASE-18451:
-
Attachment: ISSUE.patch
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: nihed mbarek
> Attachments: ISSUE.patch
>
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 35390ms
> 2017-07-24 18:45:33,362 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
nihed mbarek updated HBASE-18451:
-
Attachment: (was:
0001-HBASE-15134-Add-visibility-into-Flush-and-Compaction.patch)
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: nihed mbarek
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 35390ms
> 2017-07-24 18:45:33,362 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
nihed mbarek updated HBASE-18451:
-
Attachment: (was:
0001-HBASE-18451-PeriodicMemstoreFlusher-should-inspect-t.patch)
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: nihed mbarek
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 35390ms
> 2017-07-24 18:45:33,362 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
nihed mbarek updated HBASE-18451:
-
Status: In Progress (was: Patch Available)
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: nihed mbarek
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 35390ms
> 2017-07-24 18:45:33,362 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
nihed mbarek updated HBASE-18451:
-
Status: Patch Available (was: Open)
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: nihed mbarek
> Attachments:
> 0001-HBASE-15134-Add-visibility-into-Flush-and-Compaction.patch,
> 0001-HBASE-18451-PeriodicMemstoreFlusher-should-inspect-t.patch
>
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 35390ms
> 2017-07-24 18:45:33,362 INFO
> org.apache.hadoop.hbase.
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
nihed mbarek updated HBASE-18451:
-
Attachment: 0001-HBASE-15134-Add-visibility-into-Flush-and-Compaction.patch
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: nihed mbarek
> Attachments:
> 0001-HBASE-15134-Add-visibility-into-Flush-and-Compaction.patch,
> 0001-HBASE-18451-PeriodicMemstoreFlusher-should-inspect-t.patch
>
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 35390ms
> 2017-07-24 18:45:
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
nihed mbarek updated HBASE-18451:
-
Status: Open (was: Patch Available)
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: nihed mbarek
> Attachments:
> 0001-HBASE-18451-PeriodicMemstoreFlusher-should-inspect-t.patch
>
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 35390ms
> 2017-07-24 18:45:33,362 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,15009
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
nihed mbarek updated HBASE-18451:
-
Status: Patch Available (was: In Progress)
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: nihed mbarek
> Attachments:
> 0001-HBASE-18451-PeriodicMemstoreFlusher-should-inspect-t.patch
>
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 35390ms
> 2017-07-24 18:45:33,362 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,6002
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
nihed mbarek updated HBASE-18451:
-
Attachment: 0001-HBASE-18451-PeriodicMemstoreFlusher-should-inspect-t.patch
Patch provided with code refactor to support boolean return for
requestDelayedFlush and requestFlush
> PeriodicMemstoreFlusher should inspect the queue before adding a delayed
> flush request
> --
>
> Key: HBASE-18451
> URL: https://issues.apache.org/jira/browse/HBASE-18451
> Project: HBase
> Issue Type: Bug
> Components: regionserver
>Affects Versions: 2.0.0-alpha-1
>Reporter: Jean-Marc Spaggiari
>Assignee: nihed mbarek
> Attachments:
> 0001-HBASE-18451-PeriodicMemstoreFlusher-should-inspect-t.patch
>
>
> If you run a big job every 4 hours, impacting many tables (they have 150
> regions per server), ad the end all the regions might have some data to be
> flushed, and we want, after one hour, trigger a periodic flush. That's
> totally fine.
> Now, to avoid a flush storm, when we detect a region to be flushed, we add a
> "randomDelay" to the delayed flush, that way we spread them away.
> RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
> which is very good.
> However, because we don't check if there is already a request in the queue,
> 10 seconds after, we create a new request, with a new randomDelay.
> If you generate a randomDelay every 10 seconds, at some point, you will end
> up having a small one, and the flush will be triggered almost immediatly.
> As a result, instead of spreading all the flush within the next 5 minutes,
> you end-up getting them all way more quickly. Like within the first minute.
> Which not only feed the queue to to many flush requests, but also defeats the
> purpose of the randomDelay.
> {code}
> @Override
> protected void chore() {
> final StringBuffer whyFlush = new StringBuffer();
> for (Region r : this.server.onlineRegions.values()) {
> if (r == null) continue;
> if (((HRegion)r).shouldFlush(whyFlush)) {
> FlushRequester requester = server.getFlushRequester();
> if (requester != null) {
> long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
> MIN_DELAY_TIME;
> LOG.info(getName() + " requesting flush of " +
> r.getRegionInfo().getRegionNameAsString() + " because " +
> whyFlush.toString() +
> " after random delay " + randomDelay + "ms");
> //Throttle the flushes by putting a delay. If we don't throttle,
> and there
> //is a balanced write-load on the regions in a table, we might
> end up
> //overwhelming the filesystem with too many flushes at once.
> requester.requestDelayedFlush(r, randomDelay, false);
> }
> }
> }
> }
> {code}
> {code}
> 2017-07-24 18:44:33,338 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 270785ms
> 2017-07-24 18:44:43,328 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 200143ms
> 2017-07-24 18:44:53,954 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 191082ms
> 2017-07-24 18:45:03,528 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 92532ms
> 2017-07-24 18:45:14,201 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after random delay 238780ms
> 2017-07-24 18:45:24,195 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
> flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
> has an old edit so flush to free WALs after rand
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Jean-Marc Spaggiari updated HBASE-18451:
Description:
If you run a big job every 4 hours, impacting many tables (they have 150
regions per server), ad the end all the regions might have some data to be
flushed, and we want, after one hour, trigger a periodic flush. That's totally
fine.
Now, to avoid a flush storm, when we detect a region to be flushed, we add a
"randomDelay" to the delayed flush, that way we spread them away.
RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
which is very good.
However, because we don't check if there is already a request in the queue, 10
seconds after, we create a new request, with a new randomDelay.
If you generate a randomDelay every 10 seconds, at some point, you will end up
having a small one, and the flush will be triggered almost immediatly.
As a result, instead of spreading all the flush within the next 5 minutes, you
end-up getting them all way more quickly. Like within the first minute. Which
not only feed the queue to to many flush requests, but also defeats the purpose
of the randomDelay.
{code}
@Override
protected void chore() {
final StringBuffer whyFlush = new StringBuffer();
for (Region r : this.server.onlineRegions.values()) {
if (r == null) continue;
if (((HRegion)r).shouldFlush(whyFlush)) {
FlushRequester requester = server.getFlushRequester();
if (requester != null) {
long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
MIN_DELAY_TIME;
LOG.info(getName() + " requesting flush of " +
r.getRegionInfo().getRegionNameAsString() + " because " +
whyFlush.toString() +
" after random delay " + randomDelay + "ms");
//Throttle the flushes by putting a delay. If we don't throttle,
and there
//is a balanced write-load on the regions in a table, we might end
up
//overwhelming the filesystem with too many flushes at once.
requester.requestDelayedFlush(r, randomDelay, false);
}
}
}
}
{code}
{code}
2017-07-24 18:44:33,338 INFO
org.apache.hadoop.hbase.regionserver.HRegionServer:
hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
has an old edit so flush to free WALs after random delay 270785ms
2017-07-24 18:44:43,328 INFO
org.apache.hadoop.hbase.regionserver.HRegionServer:
hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
has an old edit so flush to free WALs after random delay 200143ms
2017-07-24 18:44:53,954 INFO
org.apache.hadoop.hbase.regionserver.HRegionServer:
hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
has an old edit so flush to free WALs after random delay 191082ms
2017-07-24 18:45:03,528 INFO
org.apache.hadoop.hbase.regionserver.HRegionServer:
hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
has an old edit so flush to free WALs after random delay 92532ms
2017-07-24 18:45:14,201 INFO
org.apache.hadoop.hbase.regionserver.HRegionServer:
hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
has an old edit so flush to free WALs after random delay 238780ms
2017-07-24 18:45:24,195 INFO
org.apache.hadoop.hbase.regionserver.HRegionServer:
hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
has an old edit so flush to free WALs after random delay 35390ms
2017-07-24 18:45:33,362 INFO
org.apache.hadoop.hbase.regionserver.HRegionServer:
hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
has an old edit so flush to free WALs after random delay 283034ms
2017-07-24 18:45:43,933 INFO
org.apache.hadoop.hbase.regionserver.HRegionServer:
hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
has an old edit so flush to free WALs after random delay 84328ms
2017-07-24 18:45:53,866 INFO
org.apache.hadoop.hbase.regionserver.HRegionServer:
hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
has an old ed
[jira] [Updated] (HBASE-18451) PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request
[
https://issues.apache.org/jira/browse/HBASE-18451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Jean-Marc Spaggiari updated HBASE-18451:
Description:
If you run a big job every 4 hours, impacting many tables (they have 150
regions per server), ad the end all the regions might have some data to be
flushed, and we want, after one hour, trigger a periodic flush. That's totally
fine.
Now, to avoid a flush storm, when we detect a region to be flushed, we add a
"randomDelay" to the delayed flush, that way we spread them away.
RANGE_OF_DELAY is 5 minutes. So we spread the flush over the next 5 minutes,
which is very good.
However, because we don't check if there is already a request in the queue, 10
seconds after, we create a new request, with a new randomDelay.
If you generate a randomDelay every 10 seconds, at some point, you will end up
having a small one, and the flush will be triggered almost immediatly.
As a result, instead of spreading all the flush within the next 5 minutes, you
end-up getting them all way more quickly. Like within the first minute. Which
defeats the purpose of the randomDelay.
{code}
@Override
protected void chore() {
final StringBuffer whyFlush = new StringBuffer();
for (Region r : this.server.onlineRegions.values()) {
if (r == null) continue;
if (((HRegion)r).shouldFlush(whyFlush)) {
FlushRequester requester = server.getFlushRequester();
if (requester != null) {
long randomDelay = RandomUtils.nextInt(RANGE_OF_DELAY) +
MIN_DELAY_TIME;
LOG.info(getName() + " requesting flush of " +
r.getRegionInfo().getRegionNameAsString() + " because " +
whyFlush.toString() +
" after random delay " + randomDelay + "ms");
//Throttle the flushes by putting a delay. If we don't throttle,
and there
//is a balanced write-load on the regions in a table, we might end
up
//overwhelming the filesystem with too many flushes at once.
requester.requestDelayedFlush(r, randomDelay, false);
}
}
}
}
{code}
{code}
2017-07-24 18:44:33,338 INFO
org.apache.hadoop.hbase.regionserver.HRegionServer:
hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
has an old edit so flush to free WALs after random delay 270785ms
2017-07-24 18:44:43,328 INFO
org.apache.hadoop.hbase.regionserver.HRegionServer:
hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
has an old edit so flush to free WALs after random delay 200143ms
2017-07-24 18:44:53,954 INFO
org.apache.hadoop.hbase.regionserver.HRegionServer:
hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
has an old edit so flush to free WALs after random delay 191082ms
2017-07-24 18:45:03,528 INFO
org.apache.hadoop.hbase.regionserver.HRegionServer:
hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
has an old edit so flush to free WALs after random delay 92532ms
2017-07-24 18:45:14,201 INFO
org.apache.hadoop.hbase.regionserver.HRegionServer:
hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
has an old edit so flush to free WALs after random delay 238780ms
2017-07-24 18:45:24,195 INFO
org.apache.hadoop.hbase.regionserver.HRegionServer:
hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
has an old edit so flush to free WALs after random delay 35390ms
2017-07-24 18:45:33,362 INFO
org.apache.hadoop.hbase.regionserver.HRegionServer:
hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
has an old edit so flush to free WALs after random delay 283034ms
2017-07-24 18:45:43,933 INFO
org.apache.hadoop.hbase.regionserver.HRegionServer:
hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
has an old edit so flush to free WALs after random delay 84328ms
2017-07-24 18:45:53,866 INFO
org.apache.hadoop.hbase.regionserver.HRegionServer:
hbasetest2.domainname.com,60020,1500916375517-MemstoreFlusherChore requesting
flush of testflush,,1500932649126.578c27d2eb7ef0ad437bf2ff38c053ae. because f
has an old edit so flush to free WALs after random delay 72291ms
2017-07-2
