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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-3598) Map-Reduce framework needlessly creates temporary _${taskid} directories for Maps
Date Fri, 20 Jun 2008 22:37:45 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-3598?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Arun C Murthy updated HADOOP-3598:
----------------------------------

      Resolution: Fixed
    Release Note: Map-Reduce framework now no-longer creates temporary task-output directories
for staging outputs if it isn't necessary.
          Status: Resolved  (was: Patch Available)

I just committed this.

> Map-Reduce framework needlessly creates temporary _${taskid} directories for Maps
> ---------------------------------------------------------------------------------
>
>                 Key: HADOOP-3598
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3598
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.18.0
>            Reporter: Arun C Murthy
>            Assignee: Arun C Murthy
>            Priority: Blocker
>             Fix For: 0.18.0
>
>         Attachments: HADOOP-3598_0_20080619.patch, HADOOP-3598_0_20080619.patch, HADOOP-3598_0_20080619.patch,
HADOOP-3598_1_20080620.patch
>
>
> The staging directory for task-outputs (i.e. ${mapred.out.dir}/_temporary/_${taskid})
should only be created when Maps produce output on HDFS, which usually isn't the case. This
plays very badly with HDFS quotas and may lead to thousands of temp names in the FS namespace,
there-by overhauling the quotas. IAC, it isn't good to needlessly create these directories.

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