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From "Raymond Liu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5491) DFSIO do not initialize write buffer correctly
Date Tue, 03 Sep 2013 23:51:52 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13757262#comment-13757262
] 

Raymond Liu commented on MAPREDUCE-5491:
----------------------------------------

hmm, I did try move RandomTextWriter's logic here, it yeild to about 1:4 compression rate,
did you think it is acceptable? I will see is there simpler random way to gain similar outputs.
                
> DFSIO do not initialize write buffer correctly
> ----------------------------------------------
>
>                 Key: MAPREDUCE-5491
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5491
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: benchmarks, test
>    Affects Versions: trunk
>            Reporter: Raymond Liu
>            Assignee: Raymond Liu
>         Attachments: MAPREDUCE-5491.patch
>
>
> In DFSIO test, the IOMapperBase will set bufferSize in configure method, while writeMapper,
appendMapper etc use bufferSize to initialize buffer in the constructor. This will lead to
buffer not initialized at all. It is ok for non compression route, while compression is used,
the output data size will be very small due to all 0 in buffer.
> Thus, the overrided configure method should be be the correct place for initial buffer

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