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From "anty.rao (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3685) There are some bugs in implementation of MergeManager
Date Mon, 19 Mar 2012 16:12:39 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13232701#comment-13232701
] 

anty.rao commented on MAPREDUCE-3685:
-------------------------------------


The bugs i reported are very clear on a glance for anyone who know the nuts and bolts of mapreduce
implementation.As for the attached patch is also very simple and straight.

I have done A LOG OF tests comparing the overall mapreduce performance in hadoop-0.23.0 and
hadoop-0.20.*,,,the results is dispointing for me, mapreduce performance in hadoop-0.23.0
is worse than that in hadoop-0.20.*,,

after digging through the code of hadoop-0.23.0, i was astonished by so many bugs that i reported.

i was wondering that do they do any performance evaluation before release these codes? Maybe
hadoop-0.23.0 isn't used in production cases, currently no one care about the performance
of mapreduce.

Which version should i generate patch  against? directly against the trunk  
                
> There are some bugs in implementation of MergeManager
> -----------------------------------------------------
>
>                 Key: MAPREDUCE-3685
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3685
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 0.23.1
>            Reporter: anty.rao
>            Assignee: Zhihong Yu
>            Priority: Minor
>             Fix For: 0.24.0
>
>         Attachments: MAPREDUCE-3685-branch-0.23.1.patch, MAPREDUCE-3685-branch-0.23.1.patch,
MAPREDUCE-3685.patch
>
>


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