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From "Jason Lowe (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4099) ApplicationMaster may fail to remove staging directory
Date Wed, 11 Apr 2012 15:05:20 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13251652#comment-13251652
] 

Jason Lowe commented on MAPREDUCE-4099:
---------------------------------------

TestClientRMService failure appears to be unrelated to this patch.  It's testing an area of
the code unrelated to the changes, and the test passes for me when I run it locally.
                
> ApplicationMaster may fail to remove staging directory
> ------------------------------------------------------
>
>                 Key: MAPREDUCE-4099
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4099
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 0.23.2
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>            Priority: Critical
>             Fix For: 0.23.3, 2.0.0
>
>         Attachments: MAPREDUCE-4099-addendum.patch, MAPREDUCE-4099-addendum.patch, MAPREDUCE-4099.patch,
MAPREDUCE-4099.patch, MAPREDUCE-4099.patch
>
>
> When the ApplicationMaster shuts down it's supposed to remove the staging directory,
assuming properties weren't set to override this behavior. During shutdown the AM tells the
ResourceManager that it has finished before it cleans up the staging directory.  However upon
hearing the AM has finished, the RM turns right around and kills the AM container.  If the
AM is too slow, the AM will be killed before the staging directory is removed.
> We're seeing the AM lose this race fairly consistently on our clusters, and the lack
of staging directory cleanup quickly leads to filesystem quota issues for some users.

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