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From "Eric Payne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-7051) FifoIntraQueuePreemptionPlugin can get concurrent modification exception/
Date Fri, 18 Aug 2017 21:18:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-7051?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16133631#comment-16133631
] 

Eric Payne commented on YARN-7051:
----------------------------------

In the cross-queue preemption policy, it is synchronizing on the leafqueue when it walks the
applications list:
{code:title=FifoCandidatesSelector#selectCandidates}
...
      synchronized (leafQueue) {
...
        Iterator<FiCaSchedulerApp> desc =
            leafQueue.getOrderingPolicy().getPreemptionIterator();
        while (desc.hasNext()) {
          FiCaSchedulerApp fc = desc.next();
{code}

> FifoIntraQueuePreemptionPlugin can get concurrent modification exception/
> -------------------------------------------------------------------------
>
>                 Key: YARN-7051
>                 URL: https://issues.apache.org/jira/browse/YARN-7051
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacity scheduler, scheduler preemption, yarn
>    Affects Versions: 2.9.0, 2.8.1, 3.0.0-alpha3
>            Reporter: Eric Payne
>            Priority: Critical
>
> {{FifoIntraQueuePreemptionPlugin#calculateUsedAMResourcesPerQueue}} has the following
code:
> {code}
>     Collection<FiCaSchedulerApp> runningApps = leafQueue.getApplications();
>     Resource amUsed = Resources.createResource(0, 0);
>     for (FiCaSchedulerApp app : runningApps) {
> {code}
> {{runningApps}} is unmodifiable but not concurrent. This caused the preemption monitor
thread to crash in the RM in one of our clusters.



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