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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14405) Fix performance regression due to incorrect use of DataChecksum
Date Wed, 10 May 2017 17:58:04 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16005106#comment-16005106

Tsz Wo Nicholas Sze commented on HADOOP-14405:

Thanks [~GeLiXin] for the contribution and [~iwasakims] for committing the patch.

> Fix performance regression due to incorrect use of DataChecksum
> ---------------------------------------------------------------
>                 Key: HADOOP-14405
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14405
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: native, performance
>    Affects Versions: 2.8.0, 3.0.0-alpha1
>            Reporter: LiXin Ge
>            Assignee: LiXin Ge
>             Fix For: 2.9.0, 2.8.1, 3.0.0-alpha3
>         Attachments: HDFS-11765.patch
> Recently I have upgraded my Hadoop version from 2.6 to 3.0, and I find that the write
performance decreased by 13%. After some days comparative analysis, It's seems introduced
by HADOOP-10865. 
> Since James Thomas have done the work that native checksum can run against byte[] arrays
instead of just against byte buffers, we may use native method preferential because it runs
faster than others.
> [~szetszwo] and [~iwasakims] could you take a look at this to see if  it make bad effect
on your benchmark test? [~tlipcon] could you help to see if I have make mistakes in this patch?
> thanks!

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