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https://issues.apache.org/jira/browse/YARN-2755?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14188728#comment-14188728
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Siqi Li commented on YARN-2755:
-------------------------------

Hi [~jlowe] can you take a look at this?

> NM fails to clean up usercache_DEL_<timestamp> dirs after YARN-661
> ------------------------------------------------------------------
>
>                 Key: YARN-2755
>                 URL: https://issues.apache.org/jira/browse/YARN-2755
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Siqi Li
>            Assignee: Siqi Li
>            Priority: Critical
>         Attachments: YARN-2755.v1.patch, YARN-2755.v2.patch, 
> YARN-2755.v3.patch
>
>
> When NM restarts frequently due to some reason, a large number of directories 
> like these left in /data/disk$num/yarn/local/:
> /data/disk1/yarn/local/usercache_DEL_1414372756105
> /data/disk1/yarn/local/usercache_DEL_1413557901696
> /data/disk1/yarn/local/usercache_DEL_1413657004894
> /data/disk1/yarn/local/usercache_DEL_1413675321860
> /data/disk1/yarn/local/usercache_DEL_1414093167936
> /data/disk1/yarn/local/usercache_DEL_1413565841271
> These directories are empty, but take up 100M+ due to the number of them. 
> There were 38714 on the machine I looked at per data disk.
> It appears to be a regression introduced by YARN-661



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