[jira] [Commented] (YARN-2755) NM fails to clean up usercache_DEL_ dirs after YARN-661

["Siqi Li (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-2755?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14185948#comment-14185948 ] 

Siqi Li commented on YARN-2755:
-------------------------------

[~sjlee0] mentioned that "NM's initialization is taking a LONG time because of this (this one's been doing this for 1 hour 41 minutes, and not all done), but monit isn't restarting it. To me, the ill effect is that the NM startup is taking a long time (and probably will get longer each time), and the directories are not getting cleaned up."

> 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
>
> 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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