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From "Amar Kamat (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1979) "Output directory already exists" error in gridmix when gridmix.output.directory is not defined
Date Tue, 07 Sep 2010 08:25:34 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12906706#action_12906706
] 

Amar Kamat commented on MAPREDUCE-1979:
---------------------------------------

+1. Looks fine to me.

> "Output directory already exists" error in gridmix when gridmix.output.directory is not
defined
> -----------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-1979
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1979
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: contrib/gridmix
>            Reporter: Ravi Gummadi
>            Assignee: Ravi Gummadi
>         Attachments: 1979.patch, 1979.v1.1.patch, 1979.v1.2.patch, 1979.v1.3.patch, 1979.v1.patch
>
>
> "Output directory already exists" error is seen in gridmix when gridmix.output.directory
is not defined. When gridmix.output.directory is not defined, then gridmix uses inputDir/gridmix/
as output path for gridmix run. Because gridmix is creating outputPath(in this case, inputDir/gridmix/)
at the begining, the output path to generate-data-mapreduce-job(i.e. inputDir) already exists
and becomes error from mapreduce.
> There is need for creation of this outputPath in any case(whether user specifies the
path using gridmix.output.directory OR gridmix itself considering inputDir/gridmix/ ) even
though the paths are automatically created for output paths of mapreduce jobs(like mkdir -p),
because gridmix needs to set 777 permissions for this outputPath sothat different users can
create different output directories of different mapreduce jobs within this gridmix run.
> The other case in which this problem is seen is when gridmix.output.directory is defined
as a relative path. This is because in this case also, gridmix tries to create relative path
under ioPath/ and thus the same issue.

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