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From "jianjin qin (Jira)" <j...@apache.org>
Subject [jira] [Created] (YARN-10765) Fair scheduler continuous scheduling thread crashes while sorting nodes
Date Mon, 10 May 2021 05:23:00 GMT
jianjin qin created YARN-10765:
----------------------------------

             Summary: Fair scheduler continuous scheduling thread crashes while sorting nodes
                 Key: YARN-10765
                 URL: https://issues.apache.org/jira/browse/YARN-10765
             Project: Hadoop YARN
          Issue Type: Bug
          Components: scheduler
    Affects Versions: 2.7.1, 2.7.0
            Reporter: jianjin qin
             Fix For: 3.0.0
         Attachments: 0001-fix-fair-scheduler-continuous-scheduling-thread-cras.patch

NodeAvailableResourceComparator use variable nodes which contains to compare, but nodeIdList
is not same with nodes.keySet() during sort. when node removed before sort, such as n2,n3
are removed, compare(n2, n3)=1 and compare(n3, n2)=1, this violates the reflexivity of comparator,
we may get the exception: java.lang.IllegalArgumentException: Comparison method violates its
general contract!
{code:java}
2021-01-19 10:22:55,102 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.mergeLo(TimSort.java:747)
        at java.util.TimSort.mergeAt(TimSort.java:483)
        at java.util.TimSort.mergeCollapse(TimSort.java:410)
        at java.util.TimSort.sort(TimSort.java:214)
        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:1069)
        at org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler$ContinuousSchedulingThread.run(FairScheduler.java:322)
{code}



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