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https://issues.apache.org/jira/browse/MAPREDUCE-3628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13181510#comment-13181510
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Todd Lipcon commented on MAPREDUCE-3628:
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k, my hunch is that it's probably MR-related, then. I've seen a lot of cases
where differences in scheduler performance give either better or worse looking
DFSIO results on the same HDFS version. And my benchmarks of HDFS 0.23 show it
significantly _faster_ than 0.20.
> DFSIO read throughput is decreased by 16% in 0.23 than Hadoop-0.20.204 on 350
> nodes size cluster.
> -------------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-3628
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3628
> Project: Hadoop Map/Reduce
> Issue Type: Task
> Components: mrv2
> Affects Versions: 0.23.0
> Reporter: Amol Kekre
> Priority: Blocker
> Fix For: 0.23.1
>
>
> DFSIO read throughput is decreased by 16% in 0.23 than Hadoop-0.20.204 on 350
> nodes size cluster.
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