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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2398) MRBench: setting the baseDir parameter has no effect
Date Mon, 05 Sep 2011 05:17:09 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2398?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13097007#comment-13097007
] 

Harsh J commented on MAPREDUCE-2398:
------------------------------------

Michael,

Thanks for the patch! :)

One minor nit: Can "mr_input" and "mr_output" strings be constant-ized and reused across both
setting statements?

For the test question, I think events outside code approach is better.

> MRBench: setting the baseDir parameter has no effect
> ----------------------------------------------------
>
>                 Key: MAPREDUCE-2398
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2398
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: benchmarks
>    Affects Versions: 0.20.2, 0.22.0
>            Reporter: Michael Noll
>            Priority: Minor
>             Fix For: 0.22.0
>
>         Attachments: MAPREDUCE-2398-trunk.patch, MAPREDUCE-2398_0.20.2.patch
>
>
> The optional {{-baseDir}} parameter lets user specify the base DFS path for output/input
of MRBench.
> However, the two private variables {{INPUT_DIR}} and {{OUTPUT_DIR}} (MRBench.java) are
not updated in the case that the default value of  {{-baseDir}} is actually overwritten by
the user. Hence any input and output is always written to the default locations ({{/benchmarks/MRBench/...}}),
even though the user-supplied location for {{-baseDir}} is created (and eventually deleted
again) on HDFS.
> The bug affects at least Hadoop 0.20.2 and the current trunk (r1082703) as of March 21,
2011.

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