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