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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-7051) Avoid concurrent modification exception in FifoIntraQueuePreemptionPlugin
Date Mon, 28 Aug 2017 07:12:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-7051?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16143460#comment-16143460
] 

Hudson commented on YARN-7051:
------------------------------

SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #12253 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/12253/])
YARN-7051. Avoid concurrent modification exception in (sunilg: rev 02599bda04e0ef46f4628b006f2430ad63cac97e)
* (edit) hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/monitor/capacity/FifoIntraQueuePreemptionPlugin.java


> Avoid concurrent modification exception in FifoIntraQueuePreemptionPlugin
> -------------------------------------------------------------------------
>
>                 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
>            Assignee: Eric Payne
>            Priority: Critical
>         Attachments: YARN-7051.001.patch, YARN-7051.002.patch
>
>
> {{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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