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Date: Thu, 7 Jan 2010 10:22:58 +0000 (UTC)
From: "V.V.Chaitanya Krishna (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-6439) Shuffle deadlocks on wrong number
 of maps
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    [ https://issues.apache.org/jira/browse/HADOOP-6439?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12797579#action_12797579 ] 

V.V.Chaitanya Krishna commented on HADOOP-6439:
-----------------------------------------------

Ran ant test in mapreduce successfully with the core jar containing the patch.
All tests passed except TestTrackerDistributedCacheManager which passed later when run individually.

> Shuffle deadlocks on wrong number of maps
> -----------------------------------------
>
>                 Key: HADOOP-6439
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6439
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: conf
>    Affects Versions: 0.21.0, 0.22.0
>            Reporter: Owen O'Malley
>            Assignee: V.V.Chaitanya Krishna
>            Priority: Blocker
>             Fix For: 0.21.0, 0.22.0
>
>         Attachments: HADOOP-6439-1.patch, HADOOP-6439-2.patch, HADOOP-6439-3.patch, HADOOP-6439-4.patch, HADOOP-6439-5.patch, HADOOP-6439-6.patch, mr-1252.patch
>
>
> The new shuffle assumes that the number of maps is correct. The new JobSubmitter sets the old value. Something misfires in the middle causing:
> 09/12/01 00:00:15 WARN conf.Configuration: mapred.job.split.file is deprecated. Instead, use mapreduce.job.splitfile
> 09/12/01 00:00:15 WARN conf.Configuration: mapred.map.tasks is deprecated. Instead, use mapreduce.job.maps
> But my reduces got stuck at 2 maps / 12 when there were only 2 maps in the job.

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