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https://issues.apache.org/jira/browse/MAPREDUCE-3628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13181391#comment-13181391
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Kihwal Lee commented on MAPREDUCE-3628:
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I believe it was TestDFSIO.
{noformat}
12/01/05 07:50:01 INFO fs.TestDFSIO: TestDFSIO.0.0.6
12/01/05 07:50:01 INFO fs.TestDFSIO: nrFiles = 2037
12/01/05 07:50:01 INFO fs.TestDFSIO: fileSize (MB) = 1024.0
12/01/05 07:50:01 INFO fs.TestDFSIO: bufferSize = 10485760
12/01/05 07:50:01 INFO fs.TestDFSIO: baseDir = /benchmarks/TestDFSIO
12/01/05 07:50:02 INFO fs.TestDFSIO: creating control file: 1073741824 bytes,
2037 files
12/01/05 07:50:36 INFO fs.TestDFSIO: created control files for: 2037 files
{noformat}
The input data set wasn't that big. So many factors external to DFS and disk
I/O could have caused this. I asked Vinay who ran the test for more details.
> 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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