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https://issues.apache.org/jira/browse/YARN-2755?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14186238#comment-14186238
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Sangjin Lee commented on YARN-2755:
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Thanks [~l201514]. Just wanted to add that when this happens and if the NM has
enough of these empty directories it would take a long time for the NM to
finish the init, and the RM gives up on it and sends a shutdown to the NM. This
cycle repeats.
> 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
>
>
> 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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