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From "Sunil G (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-7051) Avoid concurrent modification exception in FifoIntraQueuePreemptionPlugin
Date Mon, 28 Aug 2017 06:53:00 GMT

     [ https://issues.apache.org/jira/browse/YARN-7051?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sunil G updated YARN-7051:
--------------------------
    Summary: Avoid concurrent modification exception in FifoIntraQueuePreemptionPlugin  (was:
FifoIntraQueuePreemptionPlugin can get concurrent modification exception)

> 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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