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Date: Mon, 28 Aug 2017 14:30:00 +0000 (UTC)
From: "Eric Payne (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
Message-ID: <JIRA.13096144.1503090790000.136091.1503930600591@Atlassian.JIRA>
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Subject: [jira] [Commented] (YARN-7051) Avoid concurrent modification
 exception in FifoIntraQueuePreemptionPlugin
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archived-at: Mon, 28 Aug 2017 14:30:07 -0000


    [ https://issues.apache.org/jira/browse/YARN-7051?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16143830#comment-16143830 ] 

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

Thanks [~sunilg] for your help in resolving this problem.

> 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
>             Fix For: 2.9.0, 3.0.0-beta1, 2.8.2
>
>         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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