Omkar Aradhya K S commented on HADOOP-14407:

I committed to trunk. When trying to backport to branch-2, saw quite some 
conflicts. Would you please help doing branch-2 version and other ones you 

[~yzhangal] Thanks. OK, I will work on the branch-2 patch today.

> 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.patch, 
> HADOOP-14407.004.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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