[jira] [Updated] (CASSANDRA-19477) Do not go to disk to get HintsStore.getTotalFileSize
[
https://issues.apache.org/jira/browse/CASSANDRA-19477?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Gil Ganz updated CASSANDRA-19477:
-
Attachment: flamegraph_20240711.html
> Do not go to disk to get HintsStore.getTotalFileSize
>
>
> Key: CASSANDRA-19477
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19477
> Project: Cassandra
> Issue Type: Bug
> Components: Consistency/Hints
>Reporter: Jon Haddad
>Assignee: Stefan Miklosovic
>Priority: Normal
> Fix For: 4.1.5, 5.0-beta2, 5.0, 5.1-alpha1
>
> Attachments: flame-cassandra0-patched-2024-03-25_00-40-47.html,
> flame-cassandra0-release-2024-03-25_00-16-44.html, flamegraph.cpu.html,
> flamegraph_20240711.html, image-2024-03-24-17-57-32-560.png,
> image-2024-03-24-18-08-36-918.png, image-2024-03-24-18-16-50-370.png,
> image-2024-03-24-18-17-48-334.png, image-2024-03-24-18-20-07-734.png
>
> Time Spent: 4h 40m
> Remaining Estimate: 0h
>
> When testing a cluster with more requests than it could handle, I noticed
> significant CPU time (25%) spent in HintsStore.getTotalFileSize. Here's what
> I'm seeing from profiling:
> 10% of CPU time spent in HintsDescriptor.fileName which only does this:
>
> {noformat}
> return String.format("%s-%s-%s.hints", hostId, timestamp, version);{noformat}
> At a bare minimum here we should create this string up front with the host
> and version and eliminate 2 of the 3 substitutions, but I think it's probably
> faster to use a StringBuilder and avoid the underlying regular expression
> altogether.
> 12% of the time is spent in org.apache.cassandra.io.util.File.length. It
> looks like this is called once for each hint file on disk for each host we're
> hinting to. In the case of an overloaded cluster, this is significant. It
> would be better if we were to track the file size in memory for each hint
> file and reference that rather than go to the filesystem.
> These fairly small changes should make Cassandra more reliable when under
> load spikes.
> CPU Flame graph attached.
> I only tested this in 4.1 but it looks like this is present up to trunk.
>
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
-
To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org
For additional commands, e-mail: commits-h...@cassandra.apache.org
[jira] [Updated] (CASSANDRA-19477) Do not go to disk to get HintsStore.getTotalFileSize
[
https://issues.apache.org/jira/browse/CASSANDRA-19477?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Michael Semb Wever updated CASSANDRA-19477:
---
Fix Version/s: 5.0
> Do not go to disk to get HintsStore.getTotalFileSize
>
>
> Key: CASSANDRA-19477
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19477
> Project: Cassandra
> Issue Type: Bug
> Components: Consistency/Hints
>Reporter: Jon Haddad
>Assignee: Stefan Miklosovic
>Priority: Normal
> Fix For: 4.1.5, 5.0-beta2, 5.0, 5.1-alpha1
>
> Attachments: flame-cassandra0-patched-2024-03-25_00-40-47.html,
> flame-cassandra0-release-2024-03-25_00-16-44.html, flamegraph.cpu.html,
> image-2024-03-24-17-57-32-560.png, image-2024-03-24-18-08-36-918.png,
> image-2024-03-24-18-16-50-370.png, image-2024-03-24-18-17-48-334.png,
> image-2024-03-24-18-20-07-734.png
>
> Time Spent: 4h 40m
> Remaining Estimate: 0h
>
> When testing a cluster with more requests than it could handle, I noticed
> significant CPU time (25%) spent in HintsStore.getTotalFileSize. Here's what
> I'm seeing from profiling:
> 10% of CPU time spent in HintsDescriptor.fileName which only does this:
>
> {noformat}
> return String.format("%s-%s-%s.hints", hostId, timestamp, version);{noformat}
> At a bare minimum here we should create this string up front with the host
> and version and eliminate 2 of the 3 substitutions, but I think it's probably
> faster to use a StringBuilder and avoid the underlying regular expression
> altogether.
> 12% of the time is spent in org.apache.cassandra.io.util.File.length. It
> looks like this is called once for each hint file on disk for each host we're
> hinting to. In the case of an overloaded cluster, this is significant. It
> would be better if we were to track the file size in memory for each hint
> file and reference that rather than go to the filesystem.
> These fairly small changes should make Cassandra more reliable when under
> load spikes.
> CPU Flame graph attached.
> I only tested this in 4.1 but it looks like this is present up to trunk.
>
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
-
To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org
For additional commands, e-mail: commits-h...@cassandra.apache.org
[jira] [Updated] (CASSANDRA-19477) Do not go to disk to get HintsStore.getTotalFileSize
[
https://issues.apache.org/jira/browse/CASSANDRA-19477?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Stefan Miklosovic updated CASSANDRA-19477:
--
Fix Version/s: 4.1.5
5.0-beta2
5.1-alpha1
(was: 5.x)
(was: 4.1.x)
(was: 5.0-rc)
Since Version: 4.1-alpha1
Source Control Link:
https://github.com/apache/cassandra/commit/38408938ccfe5b8c051e25c645bdcd71b45fa66e
Resolution: Fixed
Status: Resolved (was: Ready to Commit)
> Do not go to disk to get HintsStore.getTotalFileSize
>
>
> Key: CASSANDRA-19477
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19477
> Project: Cassandra
> Issue Type: Bug
> Components: Consistency/Hints
>Reporter: Jon Haddad
>Assignee: Stefan Miklosovic
>Priority: Normal
> Fix For: 4.1.5, 5.0-beta2, 5.1-alpha1
>
> Attachments: flame-cassandra0-patched-2024-03-25_00-40-47.html,
> flame-cassandra0-release-2024-03-25_00-16-44.html, flamegraph.cpu.html,
> image-2024-03-24-17-57-32-560.png, image-2024-03-24-18-08-36-918.png,
> image-2024-03-24-18-16-50-370.png, image-2024-03-24-18-17-48-334.png,
> image-2024-03-24-18-20-07-734.png
>
> Time Spent: 4h 10m
> Remaining Estimate: 0h
>
> When testing a cluster with more requests than it could handle, I noticed
> significant CPU time (25%) spent in HintsStore.getTotalFileSize. Here's what
> I'm seeing from profiling:
> 10% of CPU time spent in HintsDescriptor.fileName which only does this:
>
> {noformat}
> return String.format("%s-%s-%s.hints", hostId, timestamp, version);{noformat}
> At a bare minimum here we should create this string up front with the host
> and version and eliminate 2 of the 3 substitutions, but I think it's probably
> faster to use a StringBuilder and avoid the underlying regular expression
> altogether.
> 12% of the time is spent in org.apache.cassandra.io.util.File.length. It
> looks like this is called once for each hint file on disk for each host we're
> hinting to. In the case of an overloaded cluster, this is significant. It
> would be better if we were to track the file size in memory for each hint
> file and reference that rather than go to the filesystem.
> These fairly small changes should make Cassandra more reliable when under
> load spikes.
> CPU Flame graph attached.
> I only tested this in 4.1 but it looks like this is present up to trunk.
>
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
-
To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org
For additional commands, e-mail: commits-h...@cassandra.apache.org
[jira] [Updated] (CASSANDRA-19477) Do not go to disk to get HintsStore.getTotalFileSize
[
https://issues.apache.org/jira/browse/CASSANDRA-19477?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Aleksey Yeschenko updated CASSANDRA-19477:
--
Status: Ready to Commit (was: Review In Progress)
+1, good stuff
> Do not go to disk to get HintsStore.getTotalFileSize
>
>
> Key: CASSANDRA-19477
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19477
> Project: Cassandra
> Issue Type: Bug
> Components: Consistency/Hints
>Reporter: Jon Haddad
>Assignee: Stefan Miklosovic
>Priority: Normal
> Fix For: 4.1.x, 5.0-rc, 5.x
>
> Attachments: flame-cassandra0-patched-2024-03-25_00-40-47.html,
> flame-cassandra0-release-2024-03-25_00-16-44.html, flamegraph.cpu.html,
> image-2024-03-24-17-57-32-560.png, image-2024-03-24-18-08-36-918.png,
> image-2024-03-24-18-16-50-370.png, image-2024-03-24-18-17-48-334.png,
> image-2024-03-24-18-20-07-734.png
>
> Time Spent: 4h 10m
> Remaining Estimate: 0h
>
> When testing a cluster with more requests than it could handle, I noticed
> significant CPU time (25%) spent in HintsStore.getTotalFileSize. Here's what
> I'm seeing from profiling:
> 10% of CPU time spent in HintsDescriptor.fileName which only does this:
>
> {noformat}
> return String.format("%s-%s-%s.hints", hostId, timestamp, version);{noformat}
> At a bare minimum here we should create this string up front with the host
> and version and eliminate 2 of the 3 substitutions, but I think it's probably
> faster to use a StringBuilder and avoid the underlying regular expression
> altogether.
> 12% of the time is spent in org.apache.cassandra.io.util.File.length. It
> looks like this is called once for each hint file on disk for each host we're
> hinting to. In the case of an overloaded cluster, this is significant. It
> would be better if we were to track the file size in memory for each hint
> file and reference that rather than go to the filesystem.
> These fairly small changes should make Cassandra more reliable when under
> load spikes.
> CPU Flame graph attached.
> I only tested this in 4.1 but it looks like this is present up to trunk.
>
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
-
To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org
For additional commands, e-mail: commits-h...@cassandra.apache.org
[jira] [Updated] (CASSANDRA-19477) Do not go to disk to get HintsStore.getTotalFileSize
[
https://issues.apache.org/jira/browse/CASSANDRA-19477?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Aleksey Yeschenko updated CASSANDRA-19477:
--
Status: Patch Available (was: Needs Committer)
> Do not go to disk to get HintsStore.getTotalFileSize
>
>
> Key: CASSANDRA-19477
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19477
> Project: Cassandra
> Issue Type: Bug
> Components: Consistency/Hints
>Reporter: Jon Haddad
>Assignee: Stefan Miklosovic
>Priority: Normal
> Fix For: 4.1.x, 5.0-rc, 5.x
>
> Attachments: flame-cassandra0-patched-2024-03-25_00-40-47.html,
> flame-cassandra0-release-2024-03-25_00-16-44.html, flamegraph.cpu.html,
> image-2024-03-24-17-57-32-560.png, image-2024-03-24-18-08-36-918.png,
> image-2024-03-24-18-16-50-370.png, image-2024-03-24-18-17-48-334.png,
> image-2024-03-24-18-20-07-734.png
>
> Time Spent: 4h 10m
> Remaining Estimate: 0h
>
> When testing a cluster with more requests than it could handle, I noticed
> significant CPU time (25%) spent in HintsStore.getTotalFileSize. Here's what
> I'm seeing from profiling:
> 10% of CPU time spent in HintsDescriptor.fileName which only does this:
>
> {noformat}
> return String.format("%s-%s-%s.hints", hostId, timestamp, version);{noformat}
> At a bare minimum here we should create this string up front with the host
> and version and eliminate 2 of the 3 substitutions, but I think it's probably
> faster to use a StringBuilder and avoid the underlying regular expression
> altogether.
> 12% of the time is spent in org.apache.cassandra.io.util.File.length. It
> looks like this is called once for each hint file on disk for each host we're
> hinting to. In the case of an overloaded cluster, this is significant. It
> would be better if we were to track the file size in memory for each hint
> file and reference that rather than go to the filesystem.
> These fairly small changes should make Cassandra more reliable when under
> load spikes.
> CPU Flame graph attached.
> I only tested this in 4.1 but it looks like this is present up to trunk.
>
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
-
To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org
For additional commands, e-mail: commits-h...@cassandra.apache.org
[jira] [Updated] (CASSANDRA-19477) Do not go to disk to get HintsStore.getTotalFileSize
[
https://issues.apache.org/jira/browse/CASSANDRA-19477?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Aleksey Yeschenko updated CASSANDRA-19477:
--
Reviewers: Aleksey Yeschenko, Aleksey Yeschenko (was: Aleksey Yeschenko)
Aleksey Yeschenko, Aleksey Yeschenko (was: Aleksey Yeschenko)
Status: Review In Progress (was: Patch Available)
> Do not go to disk to get HintsStore.getTotalFileSize
>
>
> Key: CASSANDRA-19477
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19477
> Project: Cassandra
> Issue Type: Bug
> Components: Consistency/Hints
>Reporter: Jon Haddad
>Assignee: Stefan Miklosovic
>Priority: Normal
> Fix For: 4.1.x, 5.0-rc, 5.x
>
> Attachments: flame-cassandra0-patched-2024-03-25_00-40-47.html,
> flame-cassandra0-release-2024-03-25_00-16-44.html, flamegraph.cpu.html,
> image-2024-03-24-17-57-32-560.png, image-2024-03-24-18-08-36-918.png,
> image-2024-03-24-18-16-50-370.png, image-2024-03-24-18-17-48-334.png,
> image-2024-03-24-18-20-07-734.png
>
> Time Spent: 4h 10m
> Remaining Estimate: 0h
>
> When testing a cluster with more requests than it could handle, I noticed
> significant CPU time (25%) spent in HintsStore.getTotalFileSize. Here's what
> I'm seeing from profiling:
> 10% of CPU time spent in HintsDescriptor.fileName which only does this:
>
> {noformat}
> return String.format("%s-%s-%s.hints", hostId, timestamp, version);{noformat}
> At a bare minimum here we should create this string up front with the host
> and version and eliminate 2 of the 3 substitutions, but I think it's probably
> faster to use a StringBuilder and avoid the underlying regular expression
> altogether.
> 12% of the time is spent in org.apache.cassandra.io.util.File.length. It
> looks like this is called once for each hint file on disk for each host we're
> hinting to. In the case of an overloaded cluster, this is significant. It
> would be better if we were to track the file size in memory for each hint
> file and reference that rather than go to the filesystem.
> These fairly small changes should make Cassandra more reliable when under
> load spikes.
> CPU Flame graph attached.
> I only tested this in 4.1 but it looks like this is present up to trunk.
>
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
-
To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org
For additional commands, e-mail: commits-h...@cassandra.apache.org
[jira] [Updated] (CASSANDRA-19477) Do not go to disk to get HintsStore.getTotalFileSize
[
https://issues.apache.org/jira/browse/CASSANDRA-19477?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Stefan Miklosovic updated CASSANDRA-19477:
--
Status: Needs Committer (was: Patch Available)
> Do not go to disk to get HintsStore.getTotalFileSize
>
>
> Key: CASSANDRA-19477
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19477
> Project: Cassandra
> Issue Type: Bug
> Components: Consistency/Hints
>Reporter: Jon Haddad
>Assignee: Stefan Miklosovic
>Priority: Normal
> Fix For: 4.1.x, 5.0-rc, 5.x
>
> Attachments: flame-cassandra0-patched-2024-03-25_00-40-47.html,
> flame-cassandra0-release-2024-03-25_00-16-44.html, flamegraph.cpu.html,
> image-2024-03-24-17-57-32-560.png, image-2024-03-24-18-08-36-918.png,
> image-2024-03-24-18-16-50-370.png, image-2024-03-24-18-17-48-334.png,
> image-2024-03-24-18-20-07-734.png
>
> Time Spent: 4h 10m
> Remaining Estimate: 0h
>
> When testing a cluster with more requests than it could handle, I noticed
> significant CPU time (25%) spent in HintsStore.getTotalFileSize. Here's what
> I'm seeing from profiling:
> 10% of CPU time spent in HintsDescriptor.fileName which only does this:
>
> {noformat}
> return String.format("%s-%s-%s.hints", hostId, timestamp, version);{noformat}
> At a bare minimum here we should create this string up front with the host
> and version and eliminate 2 of the 3 substitutions, but I think it's probably
> faster to use a StringBuilder and avoid the underlying regular expression
> altogether.
> 12% of the time is spent in org.apache.cassandra.io.util.File.length. It
> looks like this is called once for each hint file on disk for each host we're
> hinting to. In the case of an overloaded cluster, this is significant. It
> would be better if we were to track the file size in memory for each hint
> file and reference that rather than go to the filesystem.
> These fairly small changes should make Cassandra more reliable when under
> load spikes.
> CPU Flame graph attached.
> I only tested this in 4.1 but it looks like this is present up to trunk.
>
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
-
To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org
For additional commands, e-mail: commits-h...@cassandra.apache.org
[jira] [Updated] (CASSANDRA-19477) Do not go to disk to get HintsStore.getTotalFileSize
[
https://issues.apache.org/jira/browse/CASSANDRA-19477?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Jon Haddad updated CASSANDRA-19477:
---
Attachment: image-2024-03-24-18-20-07-734.png
> Do not go to disk to get HintsStore.getTotalFileSize
>
>
> Key: CASSANDRA-19477
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19477
> Project: Cassandra
> Issue Type: Bug
> Components: Consistency/Hints
>Reporter: Jon Haddad
>Assignee: Stefan Miklosovic
>Priority: Normal
> Fix For: 4.1.x, 5.0-rc, 5.x
>
> Attachments: flame-cassandra0-patched-2024-03-25_00-40-47.html,
> flame-cassandra0-release-2024-03-25_00-16-44.html, flamegraph.cpu.html,
> image-2024-03-24-17-57-32-560.png, image-2024-03-24-18-08-36-918.png,
> image-2024-03-24-18-16-50-370.png, image-2024-03-24-18-17-48-334.png,
> image-2024-03-24-18-20-07-734.png
>
> Time Spent: 4h 10m
> Remaining Estimate: 0h
>
> When testing a cluster with more requests than it could handle, I noticed
> significant CPU time (25%) spent in HintsStore.getTotalFileSize. Here's what
> I'm seeing from profiling:
> 10% of CPU time spent in HintsDescriptor.fileName which only does this:
>
> {noformat}
> return String.format("%s-%s-%s.hints", hostId, timestamp, version);{noformat}
> At a bare minimum here we should create this string up front with the host
> and version and eliminate 2 of the 3 substitutions, but I think it's probably
> faster to use a StringBuilder and avoid the underlying regular expression
> altogether.
> 12% of the time is spent in org.apache.cassandra.io.util.File.length. It
> looks like this is called once for each hint file on disk for each host we're
> hinting to. In the case of an overloaded cluster, this is significant. It
> would be better if we were to track the file size in memory for each hint
> file and reference that rather than go to the filesystem.
> These fairly small changes should make Cassandra more reliable when under
> load spikes.
> CPU Flame graph attached.
> I only tested this in 4.1 but it looks like this is present up to trunk.
>
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
-
To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org
For additional commands, e-mail: commits-h...@cassandra.apache.org
[jira] [Updated] (CASSANDRA-19477) Do not go to disk to get HintsStore.getTotalFileSize
[
https://issues.apache.org/jira/browse/CASSANDRA-19477?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Jon Haddad updated CASSANDRA-19477:
---
Attachment: image-2024-03-24-18-16-50-370.png
> Do not go to disk to get HintsStore.getTotalFileSize
>
>
> Key: CASSANDRA-19477
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19477
> Project: Cassandra
> Issue Type: Bug
> Components: Consistency/Hints
>Reporter: Jon Haddad
>Assignee: Stefan Miklosovic
>Priority: Normal
> Fix For: 4.1.x, 5.0-rc, 5.x
>
> Attachments: flame-cassandra0-patched-2024-03-25_00-40-47.html,
> flame-cassandra0-release-2024-03-25_00-16-44.html, flamegraph.cpu.html,
> image-2024-03-24-17-57-32-560.png, image-2024-03-24-18-08-36-918.png,
> image-2024-03-24-18-16-50-370.png
>
> Time Spent: 4h 10m
> Remaining Estimate: 0h
>
> When testing a cluster with more requests than it could handle, I noticed
> significant CPU time (25%) spent in HintsStore.getTotalFileSize. Here's what
> I'm seeing from profiling:
> 10% of CPU time spent in HintsDescriptor.fileName which only does this:
>
> {noformat}
> return String.format("%s-%s-%s.hints", hostId, timestamp, version);{noformat}
> At a bare minimum here we should create this string up front with the host
> and version and eliminate 2 of the 3 substitutions, but I think it's probably
> faster to use a StringBuilder and avoid the underlying regular expression
> altogether.
> 12% of the time is spent in org.apache.cassandra.io.util.File.length. It
> looks like this is called once for each hint file on disk for each host we're
> hinting to. In the case of an overloaded cluster, this is significant. It
> would be better if we were to track the file size in memory for each hint
> file and reference that rather than go to the filesystem.
> These fairly small changes should make Cassandra more reliable when under
> load spikes.
> CPU Flame graph attached.
> I only tested this in 4.1 but it looks like this is present up to trunk.
>
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
-
To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org
For additional commands, e-mail: commits-h...@cassandra.apache.org
[jira] [Updated] (CASSANDRA-19477) Do not go to disk to get HintsStore.getTotalFileSize
[
https://issues.apache.org/jira/browse/CASSANDRA-19477?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Jon Haddad updated CASSANDRA-19477:
---
Attachment: image-2024-03-24-18-17-48-334.png
> Do not go to disk to get HintsStore.getTotalFileSize
>
>
> Key: CASSANDRA-19477
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19477
> Project: Cassandra
> Issue Type: Bug
> Components: Consistency/Hints
>Reporter: Jon Haddad
>Assignee: Stefan Miklosovic
>Priority: Normal
> Fix For: 4.1.x, 5.0-rc, 5.x
>
> Attachments: flame-cassandra0-patched-2024-03-25_00-40-47.html,
> flame-cassandra0-release-2024-03-25_00-16-44.html, flamegraph.cpu.html,
> image-2024-03-24-17-57-32-560.png, image-2024-03-24-18-08-36-918.png,
> image-2024-03-24-18-16-50-370.png, image-2024-03-24-18-17-48-334.png
>
> Time Spent: 4h 10m
> Remaining Estimate: 0h
>
> When testing a cluster with more requests than it could handle, I noticed
> significant CPU time (25%) spent in HintsStore.getTotalFileSize. Here's what
> I'm seeing from profiling:
> 10% of CPU time spent in HintsDescriptor.fileName which only does this:
>
> {noformat}
> return String.format("%s-%s-%s.hints", hostId, timestamp, version);{noformat}
> At a bare minimum here we should create this string up front with the host
> and version and eliminate 2 of the 3 substitutions, but I think it's probably
> faster to use a StringBuilder and avoid the underlying regular expression
> altogether.
> 12% of the time is spent in org.apache.cassandra.io.util.File.length. It
> looks like this is called once for each hint file on disk for each host we're
> hinting to. In the case of an overloaded cluster, this is significant. It
> would be better if we were to track the file size in memory for each hint
> file and reference that rather than go to the filesystem.
> These fairly small changes should make Cassandra more reliable when under
> load spikes.
> CPU Flame graph attached.
> I only tested this in 4.1 but it looks like this is present up to trunk.
>
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
-
To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org
For additional commands, e-mail: commits-h...@cassandra.apache.org
[jira] [Updated] (CASSANDRA-19477) Do not go to disk to get HintsStore.getTotalFileSize
[
https://issues.apache.org/jira/browse/CASSANDRA-19477?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Jon Haddad updated CASSANDRA-19477:
---
Attachment: image-2024-03-24-18-08-36-918.png
> Do not go to disk to get HintsStore.getTotalFileSize
>
>
> Key: CASSANDRA-19477
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19477
> Project: Cassandra
> Issue Type: Bug
> Components: Consistency/Hints
>Reporter: Jon Haddad
>Assignee: Stefan Miklosovic
>Priority: Normal
> Fix For: 4.1.x, 5.0-rc, 5.x
>
> Attachments: flame-cassandra0-patched-2024-03-25_00-40-47.html,
> flame-cassandra0-release-2024-03-25_00-16-44.html, flamegraph.cpu.html,
> image-2024-03-24-17-57-32-560.png, image-2024-03-24-18-08-36-918.png
>
> Time Spent: 4h 10m
> Remaining Estimate: 0h
>
> When testing a cluster with more requests than it could handle, I noticed
> significant CPU time (25%) spent in HintsStore.getTotalFileSize. Here's what
> I'm seeing from profiling:
> 10% of CPU time spent in HintsDescriptor.fileName which only does this:
>
> {noformat}
> return String.format("%s-%s-%s.hints", hostId, timestamp, version);{noformat}
> At a bare minimum here we should create this string up front with the host
> and version and eliminate 2 of the 3 substitutions, but I think it's probably
> faster to use a StringBuilder and avoid the underlying regular expression
> altogether.
> 12% of the time is spent in org.apache.cassandra.io.util.File.length. It
> looks like this is called once for each hint file on disk for each host we're
> hinting to. In the case of an overloaded cluster, this is significant. It
> would be better if we were to track the file size in memory for each hint
> file and reference that rather than go to the filesystem.
> These fairly small changes should make Cassandra more reliable when under
> load spikes.
> CPU Flame graph attached.
> I only tested this in 4.1 but it looks like this is present up to trunk.
>
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
-
To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org
For additional commands, e-mail: commits-h...@cassandra.apache.org
[jira] [Updated] (CASSANDRA-19477) Do not go to disk to get HintsStore.getTotalFileSize
[
https://issues.apache.org/jira/browse/CASSANDRA-19477?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Jon Haddad updated CASSANDRA-19477:
---
Attachment: image-2024-03-24-17-57-32-560.png
> Do not go to disk to get HintsStore.getTotalFileSize
>
>
> Key: CASSANDRA-19477
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19477
> Project: Cassandra
> Issue Type: Bug
> Components: Consistency/Hints
>Reporter: Jon Haddad
>Assignee: Stefan Miklosovic
>Priority: Normal
> Fix For: 4.1.x, 5.0-rc, 5.x
>
> Attachments: flame-cassandra0-patched-2024-03-25_00-40-47.html,
> flame-cassandra0-release-2024-03-25_00-16-44.html, flamegraph.cpu.html,
> image-2024-03-24-17-57-32-560.png
>
> Time Spent: 4h 10m
> Remaining Estimate: 0h
>
> When testing a cluster with more requests than it could handle, I noticed
> significant CPU time (25%) spent in HintsStore.getTotalFileSize. Here's what
> I'm seeing from profiling:
> 10% of CPU time spent in HintsDescriptor.fileName which only does this:
>
> {noformat}
> return String.format("%s-%s-%s.hints", hostId, timestamp, version);{noformat}
> At a bare minimum here we should create this string up front with the host
> and version and eliminate 2 of the 3 substitutions, but I think it's probably
> faster to use a StringBuilder and avoid the underlying regular expression
> altogether.
> 12% of the time is spent in org.apache.cassandra.io.util.File.length. It
> looks like this is called once for each hint file on disk for each host we're
> hinting to. In the case of an overloaded cluster, this is significant. It
> would be better if we were to track the file size in memory for each hint
> file and reference that rather than go to the filesystem.
> These fairly small changes should make Cassandra more reliable when under
> load spikes.
> CPU Flame graph attached.
> I only tested this in 4.1 but it looks like this is present up to trunk.
>
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
-
To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org
For additional commands, e-mail: commits-h...@cassandra.apache.org
[jira] [Updated] (CASSANDRA-19477) Do not go to disk to get HintsStore.getTotalFileSize
[
https://issues.apache.org/jira/browse/CASSANDRA-19477?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Jon Haddad updated CASSANDRA-19477:
---
Attachment: flame-cassandra0-patched-2024-03-25_00-40-47.html
> Do not go to disk to get HintsStore.getTotalFileSize
>
>
> Key: CASSANDRA-19477
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19477
> Project: Cassandra
> Issue Type: Bug
> Components: Consistency/Hints
>Reporter: Jon Haddad
>Assignee: Stefan Miklosovic
>Priority: Normal
> Fix For: 4.1.x, 5.0-rc, 5.x
>
> Attachments: flame-cassandra0-patched-2024-03-25_00-40-47.html,
> flame-cassandra0-release-2024-03-25_00-16-44.html, flamegraph.cpu.html
>
> Time Spent: 4h 10m
> Remaining Estimate: 0h
>
> When testing a cluster with more requests than it could handle, I noticed
> significant CPU time (25%) spent in HintsStore.getTotalFileSize. Here's what
> I'm seeing from profiling:
> 10% of CPU time spent in HintsDescriptor.fileName which only does this:
>
> {noformat}
> return String.format("%s-%s-%s.hints", hostId, timestamp, version);{noformat}
> At a bare minimum here we should create this string up front with the host
> and version and eliminate 2 of the 3 substitutions, but I think it's probably
> faster to use a StringBuilder and avoid the underlying regular expression
> altogether.
> 12% of the time is spent in org.apache.cassandra.io.util.File.length. It
> looks like this is called once for each hint file on disk for each host we're
> hinting to. In the case of an overloaded cluster, this is significant. It
> would be better if we were to track the file size in memory for each hint
> file and reference that rather than go to the filesystem.
> These fairly small changes should make Cassandra more reliable when under
> load spikes.
> CPU Flame graph attached.
> I only tested this in 4.1 but it looks like this is present up to trunk.
>
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
-
To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org
For additional commands, e-mail: commits-h...@cassandra.apache.org
[jira] [Updated] (CASSANDRA-19477) Do not go to disk to get HintsStore.getTotalFileSize
[
https://issues.apache.org/jira/browse/CASSANDRA-19477?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Jon Haddad updated CASSANDRA-19477:
---
Attachment: flame-cassandra0-release-2024-03-25_00-16-44.html
> Do not go to disk to get HintsStore.getTotalFileSize
>
>
> Key: CASSANDRA-19477
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19477
> Project: Cassandra
> Issue Type: Bug
> Components: Consistency/Hints
>Reporter: Jon Haddad
>Assignee: Stefan Miklosovic
>Priority: Normal
> Fix For: 4.1.x, 5.0-rc, 5.x
>
> Attachments: flame-cassandra0-patched-2024-03-25_00-40-47.html,
> flame-cassandra0-release-2024-03-25_00-16-44.html, flamegraph.cpu.html
>
> Time Spent: 4h 10m
> Remaining Estimate: 0h
>
> When testing a cluster with more requests than it could handle, I noticed
> significant CPU time (25%) spent in HintsStore.getTotalFileSize. Here's what
> I'm seeing from profiling:
> 10% of CPU time spent in HintsDescriptor.fileName which only does this:
>
> {noformat}
> return String.format("%s-%s-%s.hints", hostId, timestamp, version);{noformat}
> At a bare minimum here we should create this string up front with the host
> and version and eliminate 2 of the 3 substitutions, but I think it's probably
> faster to use a StringBuilder and avoid the underlying regular expression
> altogether.
> 12% of the time is spent in org.apache.cassandra.io.util.File.length. It
> looks like this is called once for each hint file on disk for each host we're
> hinting to. In the case of an overloaded cluster, this is significant. It
> would be better if we were to track the file size in memory for each hint
> file and reference that rather than go to the filesystem.
> These fairly small changes should make Cassandra more reliable when under
> load spikes.
> CPU Flame graph attached.
> I only tested this in 4.1 but it looks like this is present up to trunk.
>
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
-
To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org
For additional commands, e-mail: commits-h...@cassandra.apache.org
[jira] [Updated] (CASSANDRA-19477) Do not go to disk to get HintsStore.getTotalFileSize
[
https://issues.apache.org/jira/browse/CASSANDRA-19477?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Stefan Miklosovic updated CASSANDRA-19477:
--
Fix Version/s: (was: 4.0.x)
> Do not go to disk to get HintsStore.getTotalFileSize
>
>
> Key: CASSANDRA-19477
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19477
> Project: Cassandra
> Issue Type: Bug
> Components: Consistency/Hints
>Reporter: Jon Haddad
>Assignee: Stefan Miklosovic
>Priority: Normal
> Fix For: 4.1.x, 5.0-rc, 5.x
>
> Attachments: flamegraph.cpu.html
>
> Time Spent: 3h 50m
> Remaining Estimate: 0h
>
> When testing a cluster with more requests than it could handle, I noticed
> significant CPU time (25%) spent in HintsStore.getTotalFileSize. Here's what
> I'm seeing from profiling:
> 10% of CPU time spent in HintsDescriptor.fileName which only does this:
>
> {noformat}
> return String.format("%s-%s-%s.hints", hostId, timestamp, version);{noformat}
> At a bare minimum here we should create this string up front with the host
> and version and eliminate 2 of the 3 substitutions, but I think it's probably
> faster to use a StringBuilder and avoid the underlying regular expression
> altogether.
> 12% of the time is spent in org.apache.cassandra.io.util.File.length. It
> looks like this is called once for each hint file on disk for each host we're
> hinting to. In the case of an overloaded cluster, this is significant. It
> would be better if we were to track the file size in memory for each hint
> file and reference that rather than go to the filesystem.
> These fairly small changes should make Cassandra more reliable when under
> load spikes.
> CPU Flame graph attached.
> I only tested this in 4.1 but it looks like this is present up to trunk.
>
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
-
To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org
For additional commands, e-mail: commits-h...@cassandra.apache.org
[jira] [Updated] (CASSANDRA-19477) Do not go to disk to get HintsStore.getTotalFileSize
[
https://issues.apache.org/jira/browse/CASSANDRA-19477?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Stefan Miklosovic updated CASSANDRA-19477:
--
Test and Documentation Plan: ci
Status: Patch Available (was: In Progress)
> Do not go to disk to get HintsStore.getTotalFileSize
>
>
> Key: CASSANDRA-19477
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19477
> Project: Cassandra
> Issue Type: Bug
> Components: Consistency/Hints
>Reporter: Jon Haddad
>Assignee: Stefan Miklosovic
>Priority: Normal
> Fix For: 4.0.x, 4.1.x, 5.0-rc, 5.x
>
> Attachments: flamegraph.cpu.html
>
> Time Spent: 3h 50m
> Remaining Estimate: 0h
>
> When testing a cluster with more requests than it could handle, I noticed
> significant CPU time (25%) spent in HintsStore.getTotalFileSize. Here's what
> I'm seeing from profiling:
> 10% of CPU time spent in HintsDescriptor.fileName which only does this:
>
> {noformat}
> return String.format("%s-%s-%s.hints", hostId, timestamp, version);{noformat}
> At a bare minimum here we should create this string up front with the host
> and version and eliminate 2 of the 3 substitutions, but I think it's probably
> faster to use a StringBuilder and avoid the underlying regular expression
> altogether.
> 12% of the time is spent in org.apache.cassandra.io.util.File.length. It
> looks like this is called once for each hint file on disk for each host we're
> hinting to. In the case of an overloaded cluster, this is significant. It
> would be better if we were to track the file size in memory for each hint
> file and reference that rather than go to the filesystem.
> These fairly small changes should make Cassandra more reliable when under
> load spikes.
> CPU Flame graph attached.
> I only tested this in 4.1 but it looks like this is present up to trunk.
>
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
-
To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org
For additional commands, e-mail: commits-h...@cassandra.apache.org
[jira] [Updated] (CASSANDRA-19477) Do not go to disk to get HintsStore.getTotalFileSize
[
https://issues.apache.org/jira/browse/CASSANDRA-19477?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Stefan Miklosovic updated CASSANDRA-19477:
--
Fix Version/s: 4.0.x
4.1.x
5.0-rc
> Do not go to disk to get HintsStore.getTotalFileSize
>
>
> Key: CASSANDRA-19477
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19477
> Project: Cassandra
> Issue Type: Bug
> Components: Consistency/Hints
>Reporter: Jon Haddad
>Assignee: Stefan Miklosovic
>Priority: Normal
> Fix For: 4.0.x, 4.1.x, 5.0-rc, 5.x
>
> Attachments: flamegraph.cpu.html
>
> Time Spent: 3h 50m
> Remaining Estimate: 0h
>
> When testing a cluster with more requests than it could handle, I noticed
> significant CPU time (25%) spent in HintsStore.getTotalFileSize. Here's what
> I'm seeing from profiling:
> 10% of CPU time spent in HintsDescriptor.fileName which only does this:
>
> {noformat}
> return String.format("%s-%s-%s.hints", hostId, timestamp, version);{noformat}
> At a bare minimum here we should create this string up front with the host
> and version and eliminate 2 of the 3 substitutions, but I think it's probably
> faster to use a StringBuilder and avoid the underlying regular expression
> altogether.
> 12% of the time is spent in org.apache.cassandra.io.util.File.length. It
> looks like this is called once for each hint file on disk for each host we're
> hinting to. In the case of an overloaded cluster, this is significant. It
> would be better if we were to track the file size in memory for each hint
> file and reference that rather than go to the filesystem.
> These fairly small changes should make Cassandra more reliable when under
> load spikes.
> CPU Flame graph attached.
> I only tested this in 4.1 but it looks like this is present up to trunk.
>
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
-
To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org
For additional commands, e-mail: commits-h...@cassandra.apache.org
[jira] [Updated] (CASSANDRA-19477) Do not go to disk to get HintsStore.getTotalFileSize
[
https://issues.apache.org/jira/browse/CASSANDRA-19477?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Aleksey Yeschenko updated CASSANDRA-19477:
--
Reviewers: Aleksey Yeschenko
> Do not go to disk to get HintsStore.getTotalFileSize
>
>
> Key: CASSANDRA-19477
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19477
> Project: Cassandra
> Issue Type: Bug
> Components: Consistency/Hints
>Reporter: Jon Haddad
>Assignee: Stefan Miklosovic
>Priority: Normal
> Fix For: 5.x
>
> Attachments: flamegraph.cpu.html
>
> Time Spent: 2h 40m
> Remaining Estimate: 0h
>
> When testing a cluster with more requests than it could handle, I noticed
> significant CPU time (25%) spent in HintsStore.getTotalFileSize. Here's what
> I'm seeing from profiling:
> 10% of CPU time spent in HintsDescriptor.fileName which only does this:
>
> {noformat}
> return String.format("%s-%s-%s.hints", hostId, timestamp, version);{noformat}
> At a bare minimum here we should create this string up front with the host
> and version and eliminate 2 of the 3 substitutions, but I think it's probably
> faster to use a StringBuilder and avoid the underlying regular expression
> altogether.
> 12% of the time is spent in org.apache.cassandra.io.util.File.length. It
> looks like this is called once for each hint file on disk for each host we're
> hinting to. In the case of an overloaded cluster, this is significant. It
> would be better if we were to track the file size in memory for each hint
> file and reference that rather than go to the filesystem.
> These fairly small changes should make Cassandra more reliable when under
> load spikes.
> CPU Flame graph attached.
> I only tested this in 4.1 but it looks like this is present up to trunk.
>
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
-
To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org
For additional commands, e-mail: commits-h...@cassandra.apache.org
[jira] [Updated] (CASSANDRA-19477) Do not go to disk to get HintsStore.getTotalFileSize
[
https://issues.apache.org/jira/browse/CASSANDRA-19477?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Stefan Miklosovic updated CASSANDRA-19477:
--
Summary: Do not go to disk to get HintsStore.getTotalFileSize (was:
Significant CPU overhead in HintsStore.getTotalFileSize)
> Do not go to disk to get HintsStore.getTotalFileSize
>
>
> Key: CASSANDRA-19477
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19477
> Project: Cassandra
> Issue Type: Bug
> Components: Consistency/Hints
>Reporter: Jon Haddad
>Assignee: Stefan Miklosovic
>Priority: Normal
> Fix For: 5.x
>
> Attachments: flamegraph.cpu.html
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> When testing a cluster with more requests than it could handle, I noticed
> significant CPU time (25%) spent in HintsStore.getTotalFileSize. Here's what
> I'm seeing from profiling:
> 10% of CPU time spent in HintsDescriptor.fileName which only does this:
>
> {noformat}
> return String.format("%s-%s-%s.hints", hostId, timestamp, version);{noformat}
> At a bare minimum here we should create this string up front with the host
> and version and eliminate 2 of the 3 substitutions, but I think it's probably
> faster to use a StringBuilder and avoid the underlying regular expression
> altogether.
> 12% of the time is spent in org.apache.cassandra.io.util.File.length. It
> looks like this is called once for each hint file on disk for each host we're
> hinting to. In the case of an overloaded cluster, this is significant. It
> would be better if we were to track the file size in memory for each hint
> file and reference that rather than go to the filesystem.
> These fairly small changes should make Cassandra more reliable when under
> load spikes.
> CPU Flame graph attached.
> I only tested this in 4.1 but it looks like this is present up to trunk.
>
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
-
To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org
For additional commands, e-mail: commits-h...@cassandra.apache.org
