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https://issues.apache.org/jira/browse/MAPREDUCE-6735?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15384286#comment-15384286
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Jason Lowe commented on MAPREDUCE-6735:
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What happens when HADOOP-12107 and HADOOP_12706 are pulled in together? We did
see some cases where the former without the latter was causing some extra GC
overhead, although I'd be a bit surprised it would be significant in a terasort
test.
> 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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