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Thomas Graves commented on MAPREDUCE-3897: ------------------------------------------ +1 for the formula change to fix the current issue described here. I haven't had a chance to review the code in detail. I think there is still a bug in the computation in that it uses the user minimum limit % in the calculation of maxActiveApplicationPerUser, when really that need to factor in the number active users. so similar to computeUserLimit function where it takes the max of userlimit*capacity or capacity/activeusers. Perhaps Arun can comment. > 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), 1) > 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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira