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From "Ahmed Radwan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-2787) MR-279: Performance improvement in running Uber MapTasks
Date Mon, 08 Aug 2011 19:34:28 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2787?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ahmed Radwan updated MAPREDUCE-2787:
------------------------------------

    Attachment: MAPREDUCE-2787.patch

The attached patch fixes the described issue by only creating the FileSystem and Configuration
once for all task attempts.

All mapreduce unit tests ran successfully.

> MR-279: Performance improvement in running Uber MapTasks
> --------------------------------------------------------
>
>                 Key: MAPREDUCE-2787
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2787
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: mrv2
>            Reporter: Ahmed Radwan
>            Assignee: Ahmed Radwan
>         Attachments: MAPREDUCE-2787.patch
>
>
> The runUberMapTasks() in org.apache.hadoop.mapred.UberTask obtains the local fileSystem
and local job configuration for every task attempt.  This will have a negative performance
impact.

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