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From "Kihwal Lee (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3628) DFSIO read throughput is decreased by 16% in 0.23 than Hadoop-0.20.204 on 350 nodes size cluster.
Date Fri, 06 Jan 2012 15:30:39 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13181391#comment-13181391
] 

Kihwal Lee commented on MAPREDUCE-3628:
---------------------------------------

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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