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From "Wilfred Spiegelenburg (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2910) FSLeafQueue can throw ConcurrentModificationException
Date Thu, 27 Nov 2014 22:31:12 GMT

    [ https://issues.apache.org/jira/browse/YARN-2910?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14227990#comment-14227990
] 

Wilfred Spiegelenburg commented on YARN-2910:
---------------------------------------------

[~rohithsharma] Not a problem, I tried assigning it to myself but I do not seem to have the
right to do so. I don't know if you can assign it to me or that I need to get some extra access.

> FSLeafQueue can throw ConcurrentModificationException
> -----------------------------------------------------
>
>                 Key: YARN-2910
>                 URL: https://issues.apache.org/jira/browse/YARN-2910
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: fairscheduler
>    Affects Versions: 2.5.0
>            Reporter: Wilfred Spiegelenburg
>            Assignee: Rohith
>         Attachments: FSLeafQueue_concurrent_exception.txt, YARN-2910.patch
>
>
> The list that maintains the runnable and the non runnable apps are a standard ArrayList
but there is no guarantee that it will only be manipulated by one thread in the system. This
can lead to the following exception:
> 2014-11-12 02:29:01,169 ERROR [RMCommunicator Allocator] org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator:
ERROR IN CONTACTING RM.
> java.util.ConcurrentModificationException: java.util.ConcurrentModificationException
> at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:859)
> at java.util.ArrayList$Itr.next(ArrayList.java:831)
> at org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FSLeafQueue.getResourceUsage(FSLeafQueue.java:147)
> at org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FSAppAttempt.getHeadroom(FSAppAttempt.java:180)
> at org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.allocate(FairScheduler.java:923)
> at org.apache.hadoop.yarn.server.resourcemanager.ApplicationMasterService.allocate(ApplicationMasterService.java:516)
> Full stack trace in the attached file.
> We should guard against that by using a thread safe version from java.util.concurrent.CopyOnWriteArrayList



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