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https://issues.apache.org/jira/browse/MAPREDUCE-3568?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vinod Kumar Vavilapalli updated MAPREDUCE-3568:
-----------------------------------------------
Status: Patch Available (was: Open)
> Optimize Job's progress calculations in MR AM
> ---------------------------------------------
>
> Key: MAPREDUCE-3568
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3568
> Project: Hadoop Map/Reduce
> Issue Type: Sub-task
> Components: mr-am, mrv2, performance
> Affects Versions: 0.23.0
> Reporter: Vinod Kumar Vavilapalli
> Assignee: Vinod Kumar Vavilapalli
> Fix For: 0.23.1
>
> Attachments: MAPREDUCE-3568-20111215.1.txt,
> MAPREDUCE-3568-20111220.txt
>
>
> Besides catering to client requests, Job progress is calculated in every
> heartbeat to the RM so as to print the MR AM's progress. Today the map and
> reduce progresses are calculated by looking up of each task in a big map
> while we can simply make do with a scan and aggregate. With large number of
> tasks, this can make a difference.
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