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From "Eric Payne (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-7051) FifoIntraQueuePreemptionPlugin can get concurrent modification exception/
Date Fri, 18 Aug 2017 21:14:00 GMT
Eric Payne created YARN-7051:
--------------------------------

             Summary: FifoIntraQueuePreemptionPlugin can get concurrent modification exception/
                 Key: YARN-7051
                 URL: https://issues.apache.org/jira/browse/YARN-7051
             Project: Hadoop YARN
          Issue Type: Bug
    Affects Versions: 3.0.0-alpha3, 2.8.1, 2.9.0
            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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