Jason Lowe updated YARN-2730:
    Summary: DefaultContainerExecutor runs only one localizer at a time  (was: 
Only one localizer can run on a NodeManager at a time)

+1 for the latest patch, committing this.

> DefaultContainerExecutor runs only one localizer 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, 
> YARN-2730.v3.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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