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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 19:22:09 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-52?page=comments#action_12371451 ] 

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

Overall this looks great!  A few minor comments:

. your new local variables and non-static fields use underscores as word separators, rather
than camelCase, as is both the Java convention and the convention used in the files you're
changing.  Can you please switch these to use camelCase?

. In LocalJobRunner there are potentially multiple threads changing the working directory
of a single fs.  Perhaps we should instead have a different fs instance for each job thread?
 Should we make FileSystem support clone()?

Thanks!


> 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
>
> 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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