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From "Jason Lowe (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-4099) ApplicationMaster may fail to remove staging directory
Date Fri, 06 Apr 2012 21:58:16 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4099?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jason Lowe updated MAPREDUCE-4099:
----------------------------------

    Attachment: MAPREDUCE-4099.patch

Patch to add new FINISHING state to app/appattempt.  The RM will now wait for the AM liveness
expiry interval after the AM unregisters for the AM to exit cleanly.  During this period the
app is in the FINISHING state.  Once the AM exits or it expires, the app is moved to the FINISHED
state where any containers are cleaned as usual.  This allows the AM time to perform final
cleanup tasks like removing the staging directory.

Patch is based on trunk.  Looks like we'll need a new patch for the 0.23 branch.
                
> 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
>            Priority: Critical
>         Attachments: 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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