FAQ
Improve TestDFSIO
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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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postedAug 10, '10 at 4:41p
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