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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-52) mapred input and output dirs must be absolute
Date Wed, 22 Mar 2006 22:46:59 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-52?page=comments#action_12371479 ] 

Doug Cutting commented on HADOOP-52:
------------------------------------

The synchronization fixes the problem, but causes everything to run sequentially.  I think
with the same amount of code we could add a clone() method to FileSystem and provide a better
fix.  Currently one cannot pass a FileSystem instance to JobClient, but if one could, then
we would be changing the CWD of that filesystem underneath other processes that might be using
it w/o synchronization.

If we want to be totally safe, we could make setWorkingDirectory return a clone, with no side-effects.
 Cloning an FS should be cheap enough.

> mapred input and output dirs must be absolute
> ---------------------------------------------
>
>          Key: HADOOP-52
>          URL: http://issues.apache.org/jira/browse/HADOOP-52
>      Project: Hadoop
>         Type: Bug
>   Components: mapred
>     Versions: 0.1
>     Reporter: Doug Cutting
>     Assignee: Owen O'Malley
>      Fix For: 0.1
>  Attachments: cwd.patch, cwd2.patch
>
> DFS converts relative pathnames to be under /user/$USER.  But MapReduce jobs may be submitted
by a different user than is running the jobtracker and tasktracker.  Thus relative paths must
be resolved before a job is submitted, so that only absolute paths are seen on the job tracker
and tasktracker.  I think the simplest way to fix this is to make JobConf.setInputDir(), setOutputDir(),
etc. resolve relative pathnames. 

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