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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 Fri, 12 May 2017 11:09:04 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14407?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16007968#comment-16007968
] 

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

[~yzhangal] I have submitted the patch. Could you please check this (HADOOP-14407.001.patch)?
Also, we will do more investigations into introducing both input and output copybuffersize
configurations.
If there is benefit of doing this I will submit a new patch with the changes or else we will
go ahead with this patch.

> 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
>
>
> 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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