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From "Omkar Aradhya K S (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14407) DistCp - Introduce a configurable copy buffer size
Date Thu, 18 May 2017 04:00:08 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14407?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16015158#comment-16015158
] 

Omkar Aradhya K S commented on HADOOP-14407:
--------------------------------------------

{quote}
Thanks for the updated patch Omkar Aradhya K S, are you guys still looking into setting input
and output buffer to different size? Or any chance we need to do that in the future?
{quote}
[~yzhangal] Thanks for checking the patch. As explained in the previous commit, we don't need
to do this change since even a small copybiffersize can give huge boos in performance.

{quote}
Somehow your submitting the patch did not trigger a jenkins test, maybe there is an infra
issue.
{quote}
Thanks for pointing this out. Yes, even I waited for quite some time, but there was no result!
Do I need any additional permissions for this?
Also, can you point out how exactly you triggered the build? May be I missed something?

> 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,
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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