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https://issues.apache.org/jira/browse/HADOOP-14407?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16024063#comment-16024063
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Yongjun Zhang commented on HADOOP-14407:
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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 resolved.
Thanks.
> 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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