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From "Eric Payne (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-3897) capacity scheduler - maxActiveApplicationsPerUser calculation can be wrong
Date Fri, 02 Mar 2012 19:07:58 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-3897?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Eric Payne updated MAPREDUCE-3897:

    Attachment: MAPREDUCE-3897-2.txt

Updated patch so that maxActiveApplications remains calculated based on absoluteMaxCapacity
but modified so that only maxActiveApplicationsPerUser is calculated based on absoluteCapacity.

This will limit the number of active apps for a single user to a percetage corresponding the
absolute capacity of the queue unless the user limit factor is increased for that queue.
> capacity scheduler - maxActiveApplicationsPerUser calculation can be wrong
> --------------------------------------------------------------------------
>                 Key: MAPREDUCE-3897
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3897
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 0.23.0
>            Reporter: Thomas Graves
>            Assignee: Eric Payne
>            Priority: Critical
>         Attachments: MAPREDUCE-3897-1.txt, MAPREDUCE-3897-1.txt, MAPREDUCE-3897-2.txt
> The capacity scheduler calculates the maxActiveApplications and the maxActiveApplicationsPerUser
based on the config yarn.scheduler.capacity.maximum-applications or default 10000.  
> MaxActiveApplications = max ( ceil ( clusterMemory/minAllocation * maxAMResource% * absoluteMaxCapacity),
> MaxActiveAppsPerUser = max( ceil (maxActiveApplicationsComputedAbove * (userLimit%/100)
* userLimitFactor), 1) 
> maxActiveApplications is already multiplied by the queue absolute MAXIMUM capacity, so
if max capacity > capacity and if you have user limit factor 1 (which is the default) and
only 1 user is running, that user will not be allowed to use over the queue capacity, so having
it relative to MAX capacity doesn't make sense.  That user could easily end up in a deadlock
and all its space used by application masters.

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