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From "Jason Lowe (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4157) ResourceManager should not kill apps that are well behaved
Date Thu, 19 Apr 2012 15:34:41 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13257546#comment-13257546
] 

Jason Lowe commented on MAPREDUCE-4157:
---------------------------------------

All of the test failures are unrelated to the patch because the tests fail with error messages
like the following:

{noformat}
org.apache.hadoop.yarn.YarnException: java.net.BindException: Problem binding to [0.0.0.0:8031]
java.net.BindException: Address already in use
{noformat}

Apparently rogue Hadoop daemons are running on the machine and preventing these tests from
binding to the usual ports.  A failure to cleanup a prior test run maybe?

I manually ran the tests, and they all passed.
                
> ResourceManager should not kill apps that are well behaved
> ----------------------------------------------------------
>
>                 Key: MAPREDUCE-4157
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4157
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: mrv2
>    Affects Versions: 2.0.0
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>         Attachments: MAPREDUCE-4157.patch
>
>
> Currently when the ApplicationMaster unregisters with the ResourceManager, the RM kills
(via the NMs) all the active containers for an application.  This introduces a race where
the AM may be trying to clean up and may not finish before it is killed.  The RM should give
the AM a chance to exit cleanly on its own rather than always race with a pending kill on
shutdown.

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