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From "Yongjun Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14407) DistCp - Introduce a configurable copy buffer size
Date Thu, 25 May 2017 02:20:04 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14407?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16024063#comment-16024063

Yongjun Zhang commented on HADOOP-14407:

HI [~omkarksa],

Thanks for looking into, and good point! This helped me to find a similar problem with HADOOP-11794's
branch-2 patch. In trunk, the test exists in TestOptionParser, however, similar test exists
in TestDistCpOptions in branch-2. 

I just updated branch-2 patches for both HADOOP-11794 and HADOOP-14407. So the issues are


> DistCp - Introduce a configurable copy buffer size
> --------------------------------------------------
>                 Key: HADOOP-14407
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14407
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: tools/distcp
>    Affects Versions: 2.9.0
>            Reporter: Omkar Aradhya K S
>            Assignee: Omkar Aradhya K S
>             Fix For: 2.9.0, 3.0.0-alpha3
>         Attachments: HADOOP-14407.001.patch, HADOOP-14407.002.patch, HADOOP-14407.002.patch,
HADOOP-14407.003.patch, HADOOP-14407.004.branch2.patch, HADOOP-14407.004.patch, HADOOP-14407.004.patch,
HADOOP-14407.branch2.002.patch, TotalTime-vs-CopyBufferSize.jpg
> Currently, the RetriableFileCopyCommand has a fixed copy buffer size of just 8KB. We
have noticed in our performance tests that with bigger buffer sizes we saw upto ~3x performance
boost. Hence, making the copy buffer size a configurable setting via the new parameter <copybuffersize>.

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