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https://issues.apache.org/jira/browse/HADOOP-16833?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17028979#comment-17028979
]
Hadoop QA commented on HADOOP-16833:
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m
59s{color} | {color:blue} Docker mode activated. {color} |
|| || || || {color:brown} Prechecks {color} ||
| {color:green}+1{color} | {color:green} @author {color} | {color:green} 0m
0s{color} | {color:green} The patch does not contain any @author tags. {color} |
| {color:green}+1{color} | {color:green} test4tests {color} | {color:green} 0m
0s{color} | {color:green} The patch appears to include 2 new or modified test
files. {color} |
|| || || || {color:brown} trunk Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 20m
28s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 15m
59s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m
46s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 1m
18s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green}
15m 11s{color} | {color:green} branch has no errors when building and testing
our client artifacts. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 1m
39s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m
22s{color} | {color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 0m
45s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 15m
15s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 15m
15s{color} | {color:green} the patch passed {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}
0m 42s{color} | {color:orange} hadoop-common-project/hadoop-common: The patch
generated 1 new + 1 unchanged - 0 fixed = 2 total (was 1) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 1m
12s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green} 0m
0s{color} | {color:green} The patch has no whitespace issues. {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green}
12m 52s{color} | {color:green} patch has no errors when building and testing
our client artifacts. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 1m
47s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m
21s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 8m
59s{color} | {color:green} hadoop-common in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m
46s{color} | {color:green} The patch does not generate ASF License warnings.
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| {color:black}{color} | {color:black} {color} | {color:black}101m 17s{color} |
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|| Subsystem || Report/Notes ||
| Docker | Client=19.03.5 Server=19.03.5 Image:yetus/hadoop:c44943d1fc3 |
| JIRA Issue | HADOOP-16833 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12992489/HADOOP-16833.003.patch
|
| Optional Tests | dupname asflicense compile javac javadoc mvninstall
mvnsite unit shadedclient findbugs checkstyle |
| uname | Linux 07400c9d6f36 4.15.0-74-generic #84-Ubuntu SMP Thu Dec 19
08:06:28 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / 1e3a0b0 |
| maven | version: Apache Maven 3.3.9 |
| Default Java | 1.8.0_242 |
| findbugs | v3.1.0-RC1 |
| checkstyle |
https://builds.apache.org/job/PreCommit-HADOOP-Build/16749/artifact/out/diff-checkstyle-hadoop-common-project_hadoop-common.txt
|
| Test Results |
https://builds.apache.org/job/PreCommit-HADOOP-Build/16749/testReport/ |
| Max. process+thread count | 1795 (vs. ulimit of 5500) |
| modules | C: hadoop-common-project/hadoop-common U:
hadoop-common-project/hadoop-common |
| Console output |
https://builds.apache.org/job/PreCommit-HADOOP-Build/16749/console |
| Powered by | Apache Yetus 0.8.0 http://yetus.apache.org |
This message was automatically generated.
> InstrumentedLock should log lock queue time
> -------------------------------------------
>
> Key: HADOOP-16833
> URL: https://issues.apache.org/jira/browse/HADOOP-16833
> Project: Hadoop Common
> Issue Type: Improvement
> Components: util
> Affects Versions: 3.3.0
> Reporter: Stephen O'Donnell
> Assignee: Stephen O'Donnell
> Priority: Major
> Attachments: HADOOP-16833.001.patch, HADOOP-16833.002.patch,
> HADOOP-16833.003.patch
>
>
> Within the Datanode, we often see contention around the FsDatasetImpl lock.
> This can be for various reasons, eg the DN is under IO load, and other bugs,
> eg HDFS-15131.
> When DN slow downs happen, it is very difficult to debug what is causing it,
> as there are few messages in the logs which indicate what is happening.
> In my experience, the presence of this log is informative:
> {code}
> 2019-11-27 09:00:49,678 INFO org.apache.hadoop.hdfs.server.datanode.DataNode:
> Took 21540ms to process 1 commands from NN
> {code}
> This comes from the datanode heartbeat thread, and it is logged when the
> commands returned from the heartbeat cannot be enqueued, and usually this is
> because the thread cannot get the FsDatasetImpl lock due to contention with
> other slow threads.
> HDFS-14997 moved the command processing to an async thread, and hence this
> useful message will disappear.
> InstrumentedLock introduced a feature to the datanode, where it will log a
> stack trace if any thread holds the lock for over 300ms. However this will
> not catch a scenario where 10 threads each hold a lock for 200ms, leading to
> the next in the queue having waited over 2 seconds.
> I believe it would be useful to extend InstrumentedLock to log if a thread
> has to wait for over some threshold. That way, we could be able to catch
> scenarios like the heartbeat thread shows us, but in a much more obvious way,
> provided lock contention is involved.
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