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Posted to mapreduce-dev@hadoop.apache.org by "Ramya Sunil (Created) (JIRA)" <ji...@apache.org> on 2012/02/01 23:47:53 UTC

[jira] [Created] (MAPREDUCE-3784) maxActiveApplications(|PerUser) per queue is too low for small clusters

maxActiveApplications(|PerUser) per queue is too low for small clusters
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                 Key: MAPREDUCE-3784
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3784
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: mrv2
    Affects Versions: 0.23.1
            Reporter: Ramya Sunil


We ran into this issue while testing on small clusters. 
On a 7node cluster with 8G per node,  for a queue with absolute capacity 30%, user limit 100%, maxActiveApplications and maxActiveApplicationsPerUser is calculated to be 1.
This means that even though the queue has 17GB(0.3*8*7), only 1 user can run 1 app at a given time queuing up rest of the apps/users. This hurts performance on small clusters.


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