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From "Robert Chansler (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-3598) Map-Reduce framework needlessly creates temporary _${taskid} directories for Maps
Date Fri, 04 Jul 2008 00:26:45 GMT

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

Robert Chansler updated HADOOP-3598:
------------------------------------

    Release Note: Changed Map-Reduce framework to no longer create temporary task output directories
for staging outputs if staging outputs isn't necessary. ${mapred.out.dir}/_temporary/_${taskid}
 (was: Map-Reduce framework now no-longer creates temporary task-output directories for staging
outputs if it isn't necessary.)

> 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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