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https://issues.apache.org/jira/browse/MAPREDUCE-6735?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15384265#comment-15384265
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Alexandr Balitsky commented on MAPREDUCE-6735:
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Unfortunately, I don't know how HADOOP-12107 is impacting things, but there is
~1min increase coming from commit HADOOP-12107.
> Performance degradation caused by MAPREDUCE-5465 and HADOOP-12107
> -----------------------------------------------------------------
>
> Key: MAPREDUCE-6735
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6735
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Alexandr Balitsky
>
> Two commits, MAPREDUCE-5465 and HADOOP-12107 are making Terasort on YARN 10%
> slower.
> Reduce phase with those commits ~5 mins
> Reduce phase without ~3.5 mins
> Average Reduce is taking 4mins, 16sec with those commits compared to 3mins,
> 48sec without.
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