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https://issues.apache.org/jira/browse/MAPREDUCE-3667?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13194597#comment-13194597
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Karam Singh commented on MAPREDUCE-3667:
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Hi Arun 
I have similar setting for 0.23 and Hadoop-0.20.204 with GridMix and same trace
mapred.job.shuffle.input.buffer.percent=0.7 is Hadoop 0.20.204
And
mapreduce.reduce.shuffle.input.buffer.percent=0.7

Hadoop 0.20.204 reducers does not goes OOM, I have seen this in Hadoop.Next 
only.
And even in Hadoop 0.23 the behavior is not consistent, random number of job 
used fail due to this.
W.r.t to Hadoop-0.20.204 is not a regression


                
> Gridmix jobs are failing with OOM in reduce shuffle phase.
> ----------------------------------------------------------
>
>                 Key: MAPREDUCE-3667
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3667
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 0.23.0
>            Reporter: Amol Kekre
>            Priority: Blocker
>             Fix For: 0.23.1
>
>
> Roll up bug for gridmix3 benchmark

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