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From "Karthik Kambatla (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (YARN-6448) Continuous scheduling thread crashes while sorting nodes
Date Wed, 05 Apr 2017 23:01:41 GMT

     [ https://issues.apache.org/jira/browse/YARN-6448?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Karthik Kambatla resolved YARN-6448.
------------------------------------
       Resolution: Fixed
     Hadoop Flags: Reviewed
    Fix Version/s: 2.9.0

Just committed this to trunk and branch-2. 

Thanks Yufei for reporting and fixing this. 

> Continuous scheduling thread crashes while sorting nodes
> --------------------------------------------------------
>
>                 Key: YARN-6448
>                 URL: https://issues.apache.org/jira/browse/YARN-6448
>             Project: Hadoop YARN
>          Issue Type: Bug
>    Affects Versions: 2.9.0, 3.0.0-alpha2
>            Reporter: Yufei Gu
>            Assignee: Yufei Gu
>             Fix For: 2.9.0
>
>         Attachments: YARN-6448.001.patch, YARN-6448.002.patch, YARN-6448.003.patch, YARN-6448.004.patch
>
>
> YARN-4719 remove the lock in continuous scheduling while sorting nodes. It breaks the
order in comparison if nodes changes while sorting.
> {code}
> 2017-04-04 23:42:26,123 FATAL org.apache.hadoop.yarn.server.resourcemanager.RMCriticalThreadUncaughtExceptionHandler:
Critical thread FairSchedulerContinuousScheduling crashed!
> java.lang.IllegalArgumentException: Comparison method violates its general contract!
>         at java.util.TimSort.mergeHi(TimSort.java:899)
>         at java.util.TimSort.mergeAt(TimSort.java:516)
>         at java.util.TimSort.mergeForceCollapse(TimSort.java:457)
>         at java.util.TimSort.sort(TimSort.java:254)
>         at java.util.Arrays.sort(Arrays.java:1512)
>         at java.util.ArrayList.sort(ArrayList.java:1454)
>         at java.util.Collections.sort(Collections.java:175)
>         at org.apache.hadoop.yarn.server.resourcemanager.scheduler.ClusterNodeTracker.sortedNodeList(ClusterNodeTracker.java:306)
>         at org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.continuousSchedulingAttempt(FairScheduler.java:884)
>         at org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler$ContinuousSchedulingThread.run(FairScheduler.java:316)
> {code}



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