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https://issues.apache.org/jira/browse/MAPREDUCE-2694?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vinod Kumar Vavilapalli reopened MAPREDUCE-2694:
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Assignee: (was: Arun C Murthy)
Reopening the issue as the discussion is still happening.
> AM releases too many containers due to the protocol
> ---------------------------------------------------
>
> Key: MAPREDUCE-2694
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2694
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2
> Reporter: Arun C Murthy
>
> - AM sends request asking 4 containers on host H1.
> - Asynchronously, host H1 reaches RM and gets assigned 4 containers. RM at
> this point, sets the value against H1 to
> zero in its aggregate request-table for all apps.
> - In the mean-while AM gets to need 3 more containers, so a total of 7
> including the 4 from previous request.
> - Today, AM sends the absolute number of 7 against H1 to RM as part of its
> request table.
> - RM seems to be overriding its earlier value of zero against H1 to 7 against
> H1. And thus allocating 7 more
> containers.
> - AM already gets 4 in this scheduling iteration, but gets 7 more, a total of
> 11 instead of the required 7.
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