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https://issues.apache.org/jira/browse/MAPREDUCE-4680?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13806963#comment-13806963
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Robert Kanter commented on MAPREDUCE-4680:
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The test passes locally and the test I added doesn't start a JHS, so it can't 
be causing this.

> Job history cleaner should only check timestamps of files in old enough 
> directories
> -----------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-4680
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4680
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: jobhistoryserver
>    Affects Versions: 2.0.0-alpha
>            Reporter: Sandy Ryza
>            Assignee: Robert Kanter
>         Attachments: MAPREDUCE-4680.patch, MAPREDUCE-4680.patch, 
> MAPREDUCE-4680.patch, MAPREDUCE-4680.patch, MAPREDUCE-4680.patch
>
>
> Job history files are stored in yyyy/mm/dd folders.  Currently, the job 
> history cleaner checks the modification date of each file in every one of 
> these folders to see whether it's past the maximum age.  The load on HDFS 
> could be reduced by only checking the ages of files in directories that are 
> old enough, as determined by their name.



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