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From "Mariappan Asokan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4842) Shuffle race can hang reducer
Date Wed, 06 Mar 2013 02:16:12 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4842?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13594248#comment-13594248
] 

Mariappan Asokan commented on MAPREDUCE-4842:
---------------------------------------------

Hi Ravi,
  Thanks for the compliment.  I will look at the patch for MAPREDUCE-3685 and post my comments
there once I understand it completely.

-- Asokan

                
> Shuffle race can hang reducer
> -----------------------------
>
>                 Key: MAPREDUCE-4842
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4842
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 2.0.2-alpha, 0.23.5
>            Reporter: Jason Lowe
>            Assignee: Mariappan Asokan
>            Priority: Blocker
>             Fix For: 2.0.3-alpha, 0.23.6
>
>         Attachments: MAPREDUCE-4842-2.patch, mapreduce-4842.patch, mapreduce-4842.patch,
mapreduce-4842.patch, mapreduce-4842.patch, mapreduce-4842.patch, mapreduce-4842.patch, MAPREDUCE-4842.patch,
MAPREDUCE-4842.patch, MAPREDUCE-4842.patch, MAPREDUCE-4842.patch
>
>
> Saw an instance where the shuffle caused multiple reducers in a job to hang.  It looked
similar to the problem described in MAPREDUCE-3721, where the fetchers were all being told
to WAIT by the MergeManager but no merge was taking place.

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