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https://issues.apache.org/jira/browse/HDFS-1338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12897071#action_12897071
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Tsz Wo (Nicholas), SZE commented on HDFS-1338:
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> ... The MR scheduler has no opportunity to do any optimization for the
> TestDFSIO MR application. ...
I might be wrong: I think the original design of TestDFSIO is to measure DFS IO
but not MR scheduler or other MR component. Would you consider to have a
separated TestMRIO benchmark for MR?
> Improve TestDFSIO
> -----------------
>
> Key: HDFS-1338
> URL: https://issues.apache.org/jira/browse/HDFS-1338
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Arun C Murthy
>
> Currently the read test in TestDFSIO benchmark just opens a large side file
> and measures the read performance. The MR scheduler has no opportunity to do
> *any* optimization for the TestDFSIO MR application. The side-effect of this
> is that it is *very* hard to do any meaningful analysis of the results of the
> benchmark i.e. to check if node-local or rack-local or off-switch read
> performance improved/degraded.
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