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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2730) Only one localizer can run on a NodeManager at a time
Date Mon, 03 Nov 2014 14:53:35 GMT

    [ https://issues.apache.org/jira/browse/YARN-2730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14194593#comment-14194593
] 

Jason Lowe commented on YARN-2730:
----------------------------------

Thanks for updating the patch, Siqi.  In the latest patch the startLocalizer method is still
synchronized, so the original problem remains.

> Only one localizer can run on a NodeManager at a time
> -----------------------------------------------------
>
>                 Key: YARN-2730
>                 URL: https://issues.apache.org/jira/browse/YARN-2730
>             Project: Hadoop YARN
>          Issue Type: Bug
>    Affects Versions: 2.4.0
>            Reporter: Siqi Li
>            Assignee: Siqi Li
>            Priority: Critical
>         Attachments: YARN-2730.v1.patch, YARN-2730.v2.patch
>
>
> We are seeing that when one of the localizerRunner stuck, the rest of the localizerRunners
are blocked. We should remove the synchronized modifier.
> The synchronized modifier appears to have been added by https://issues.apache.org/jira/browse/MAPREDUCE-3537
> It could be removed if Localizer doesn't depend on current directory



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