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