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https://issues.apache.org/jira/browse/YARN-9940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16969793#comment-16969793
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Wilfred Spiegelenburg commented on YARN-9940:
---------------------------------------------

Hadoop 2.7 has been EOL'ed, no more releases or fixes.
Please see here: 
https://cwiki.apache.org/confluence/display/HADOOP/EOL+%28End-of-life%29+Release+Branches



> 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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