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From "zhihai xu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3491) PublicLocalizer#addResource is too slow.
Date Wed, 06 May 2015 23:13:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-3491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14531639#comment-14531639

zhihai xu commented on YARN-3491:

thanks [~jlowe], [~sjlee0] and [~jira.shegalov] for the valuable suggestions.
thanks [~wilfreds] and [~adhoot] for reviewing the patch.
thanks [~rkanter] for the review and committing the patch.
thanks [~vinodkv] for your feedback!

> PublicLocalizer#addResource is too slow.
> ----------------------------------------
>                 Key: YARN-3491
>                 URL: https://issues.apache.org/jira/browse/YARN-3491
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: nodemanager
>    Affects Versions: 2.7.0
>            Reporter: zhihai xu
>            Assignee: zhihai xu
>            Priority: Critical
>             Fix For: 2.8.0
>         Attachments: YARN-3491.000.patch, YARN-3491.001.patch, YARN-3491.002.patch, YARN-3491.003.patch,
> Based on the profiling, The bottleneck in PublicLocalizer#addResource is getInitializedLocalDirs.
getInitializedLocalDirs call checkLocalDir.
> checkLocalDir is very slow which takes about 10+ ms.
> The total delay will be approximately number of local dirs * 10+ ms.
> This delay will be added for each public resource localization.
> Because PublicLocalizer#addResource is slow, the thread pool can't be fully utilized.
Instead of doing public resource localization in parallel(multithreading), public resource
localization is serialized most of the time.
> And also PublicLocalizer#addResource is running in Dispatcher thread, 
> So the Dispatcher thread will be blocked by PublicLocalizer#addResource for long time.

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