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Date: Tue, 9 Sep 2014 16:33:28 +0000 (UTC)
From: "Wei Yan (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
Message-ID: <JIRA.12740173.1410279511000.28570.1410280408435@Atlassian.JIRA>
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 <JIRA.12740173.1410279511489@arcas>
Subject: [jira] [Updated] (YARN-2526) Scheduler Load Simulator may enter
 deadlock if lots of applications submitted to the RM at the same time
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     [ https://issues.apache.org/jira/browse/YARN-2526?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wei Yan updated YARN-2526:
--------------------------
    Priority: Minor  (was: Major)

> Scheduler Load Simulator may enter deadlock if lots of applications submitted to the RM at the same time
> --------------------------------------------------------------------------------------------------------
>
>                 Key: YARN-2526
>                 URL: https://issues.apache.org/jira/browse/YARN-2526
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Wei Yan
>            Assignee: Wei Yan
>            Priority: Minor
>         Attachments: YARN-2526-1.patch
>
>
> The simulation may enter deadlock if all application simulators hold all threads provided by the thread pool, and all wait for AM container allocation. In that case, all AM simulators wait for NM simulators to do heartbeat to allocate resource, and all NM simulators wait for AM simulators to release some threads. The simulator is deadlocked.
> To solve this deadlock, need to remove the while() loop in the MRAMSimulator.
> {code}
>     // waiting until the AM container is allocated
>     while (true) {
>       if (response != null && ! response.getAllocatedContainers().isEmpty()) {
>         // get AM container
>         .....
>         break;
>       }
>       // this sleep time is different from HeartBeat
>       Thread.sleep(1000);
>       // send out empty request
>       sendContainerRequest();
>       response = responseQueue.take();
>     }
> {code}


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