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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MAPREDUCE-1471) FileOutputCommitter does not safely clean up it's temporary files
Date Sun, 22 Apr 2012 05:37:35 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1471?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Harsh J resolved MAPREDUCE-1471.

    Resolution: Won't Fix

The resolution here was that the dev ought to implement a custom OC for such needs.
> FileOutputCommitter does not safely clean up it's temporary files
> -----------------------------------------------------------------
>                 Key: MAPREDUCE-1471
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1471
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 0.20.1
>            Reporter: Jim Finnessy
>   Original Estimate: 4h
>  Remaining Estimate: 4h
> When the FileOutputCommitter cleans up during it's cleanupJob method, it potentially
deletes the temporary files of other concurrent jobs.
> Since all the temporary files for all concurrent jobs are written to working_path/_temporary/
any concurrent tasks that have the same working_path will remove all currently executing jobs
when it removes working_path/_temporary during job cleanup.
> If the file name output is guaranteed by the client application to be unique, the temporary
files/directories should also be guaranteed to be unique to avoid this problem. Suggest modifying
cleanupJob to only remove files that it created itself.

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