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https://issues.apache.org/jira/browse/MAPREDUCE-2787?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13082823#comment-13082823
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Arun C Murthy commented on MAPREDUCE-2787:
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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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