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From "Sanjay Dahiya (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-728) Map-reduce task does not produce correct results when -reducer NONE is specified through streaming
Date Thu, 30 Nov 2006 19:12:23 GMT
     [ http://issues.apache.org/jira/browse/HADOOP-728?page=all ]

Sanjay Dahiya updated HADOOP-728:
---------------------------------

    Attachment: Hadoop-728.patch

This patch fixes a few other issues as well - 
1. Some map tasks writing to DFS were generating incomplete files, added flush() in MROutputThread
2. Added extra checks in TaskTracker and PhasedFileSystem to check for temporary file existence
before attempting delete. This avoids extra lines in namenode logs. 
3. Changed a variable name, sideEffectURI_ is now finalOutputURI and is used to get correct
file name. 

off topic : I was not aware that there are real languages written bottom to top http://en.wikipedia.org/wiki/Writing_system#Directionality


> Map-reduce task does not produce correct results when -reducer NONE is specified through
streaming
> --------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-728
>                 URL: http://issues.apache.org/jira/browse/HADOOP-728
>             Project: Hadoop
>          Issue Type: Bug
>          Components: contrib/streaming
>            Reporter: dhruba borthakur
>         Assigned To: Sanjay Dahiya
>         Attachments: Hadoop-728.patch, Hadoop-728.patch
>
>
> a) a file is create for the output instead of a directory.
> b) there is no way to understand what is going on from the client output
> I can produce an example for you, if you like -- but the behavior is consistent, so $HSTREAM
-mapper /bin/cat -reducer NONE should show the problem
> ~

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