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https://issues.apache.org/jira/browse/YARN-742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13675337#comment-13675337
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Hadoop QA commented on YARN-742:
--------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest 
attachment 
  
http://issues.apache.org/jira/secure/attachment/12586204/YARN-742-1.branch-0.23.patch
  against trunk revision .

    {color:red}-1 patch{color}.  The patch command could not apply the patch.

Console output: https://builds.apache.org/job/PreCommit-YARN-Build/1117//console

This message is automatically generated.
                
> Log aggregation causes a lot of redundant setPermission calls
> -------------------------------------------------------------
>
>                 Key: YARN-742
>                 URL: https://issues.apache.org/jira/browse/YARN-742
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: nodemanager
>    Affects Versions: 0.23.7, 2.0.4-alpha
>            Reporter: Kihwal Lee
>            Assignee: Jason Lowe
>         Attachments: YARN-742-1.branch-0.23.patch, YARN-742-1.patch, 
> YARN-742.patch
>
>
> In one of our clusters, namenode RPC is spending 45% of its time on serving 
> setPermission calls. Further investigation has revealed that most calls are 
> redundantly made on /mapred/logs/<user>/logs. Also mkdirs calls are made 
> before this.

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