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https://issues.apache.org/jira/browse/MAPREDUCE-5491?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Allen Wittenauer updated MAPREDUCE-5491:
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Labels: BB2015-05-TBR (was: )
> 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
> Reporter: Raymond Liu
> Assignee: Raymond Liu
> Labels: BB2015-05-TBR
> Attachments: MAPREDUCE-5491-v2.patch, 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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