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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3598) Map-Reduce framework needlessly creates temporary _${taskid} directories for Maps
Date Sat, 21 Jun 2008 12:25:45 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12607004#action_12607004
] 

Hudson commented on HADOOP-3598:
--------------------------------

Integrated in Hadoop-trunk #525 (See [http://hudson.zones.apache.org/hudson/job/Hadoop-trunk/525/])

> 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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