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From "Jonathan Eagles (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2666) MR-279: Need to retrieve shuffle port number on ApplicationMaster restart
Date Tue, 11 Oct 2011 16:31:12 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2666?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13125171#comment-13125171
] 

Jonathan Eagles commented on MAPREDUCE-2666:
--------------------------------------------

Please give initial feedback on the jobhistory storage approach. After getting feedback on
the initial approach, will start implementing the recovery service portion of the fix.
                
> MR-279: Need to retrieve shuffle port number on ApplicationMaster restart
> -------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-2666
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2666
>             Project: Hadoop Map/Reduce
>          Issue Type: Sub-task
>          Components: mrv2
>    Affects Versions: 0.23.0
>            Reporter: Robert Joseph Evans
>            Assignee: Jonathan Eagles
>            Priority: Blocker
>             Fix For: 0.23.0
>
>         Attachments: MAPREDUCE-2666.patch
>
>
> MAPREDUCE-2652 allows ShuffleHandler to return the port it is operating on.  In the case
of an ApplicationMaster crash where it needs to be restarted that information is lost.  We
either need to re-query it from each of the NodeManagers or to persist it to the JobHistory
logs and retrieve it again.  The job history logs is probably the simpler solution.

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