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Date: Fri, 20 Jun 2008 11:55:45 -0700 (PDT)
From: "Arun C Murthy (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Updated: (HADOOP-3598) Map-Reduce framework needlessly
 creates temporary _${taskid} directories for Maps
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     [ https://issues.apache.org/jira/browse/HADOOP-3598?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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

    Status: Open  (was: Patch Available)

> 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
>
>
> 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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