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From "Hemanth Yamijala (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6439) Shuffle deadlocks on wrong number of maps
Date Wed, 21 Apr 2010 04:58:52 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6439?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12859198#action_12859198
] 

Hemanth Yamijala commented on HADOOP-6439:
------------------------------------------

bq. @Hemanth, I don't think we need to update patches for branch 0.21, as per discussion in
general mailing list, branch 0.21 will be cut from trunk itself.

Ah. If that's so, then we are good to go. I will wait for Tom's / anyone else's confirmation
on this.

> 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, HADOOP-6439-6.patch, HADOOP-6439-7.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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