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https://issues.apache.org/jira/browse/YARN-9940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16969691#comment-16969691
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Wilfred Spiegelenburg commented on YARN-9940:
---------------------------------------------
The stack trace does not line up with hadoop 2.7.2. The FS call to sort is
located at [line
1002|https://github.com/apache/hadoop/blob/branch-2.7.2/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/FairScheduler.java#L1002]
in that release. Line 1117 is blank.
This fix also does not look correct at all. It touches code which I think it
should not touch.
The method {{FairScheduler.completedContainer()}} method is already
synchronised adding a synchronised block inside that will not help. The same
for the {{AbstractYarnScheduler.recoverContainersOnNode()}} is synchronised.
> avoid continuous scheduling thread crashes while sorting nodes get
> 'Comparison method violates its general contract'
> --------------------------------------------------------------------------------------------------------------------
>
> Key: YARN-9940
> URL: https://issues.apache.org/jira/browse/YARN-9940
> Project: Hadoop YARN
> Issue Type: Bug
> Components: fairscheduler
> Affects Versions: 2.7.2
> Reporter: kailiu_dev
> Assignee: kailiu_dev
> Priority: Major
> Attachments: YARN-9940-branch-2.7.2.001.patch
>
>
> 2019-10-16 09:14:51,215 ERROR
> org.apache.hadoop.yarn.YarnUncaughtExceptionHandler: Thread
> Thread[FairSchedulerContinuousScheduling,5,main] threw an Exception.
> java.lang.IllegalArgumentException: Comparison method violates its general
> contract!
> at java.util.TimSort.mergeHi(TimSort.java:868)
> at java.util.TimSort.mergeAt(TimSort.java:485)
> at java.util.TimSort.mergeForceCollapse(TimSort.java:426)
> at java.util.TimSort.sort(TimSort.java:223)
> at java.util.TimSort.sort(TimSort.java:173)
> at java.util.Arrays.sort(Arrays.java:659)
> at java.util.Collections.sort(Collections.java:217)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.continuousSchedulingAttempt(FairScheduler.java:1117)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler$ContinuousSchedulingThread.run(FairScheduler.java:296)
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