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Posted to mapreduce-issues@hadoop.apache.org by "Arun C Murthy (JIRA)" <ji...@apache.org> on 2011/08/11 02:57:27 UTC

[jira] [Commented] (MAPREDUCE-2787) MR-279: Performance improvement in running Uber MapTasks

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2787?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13082823#comment-13082823 ] 

Arun C Murthy commented on MAPREDUCE-2787:
------------------------------------------

Ahmed - UberTask isn't used anymore in MR-279. The AM uses a different LocalContainerLauncher and LocalContainerAllocator in-lieu of UberTask. Please do take a look at the newer impl. Thanks.

Should we close this as won't fix? 

> 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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