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Date: Thu, 2 Feb 2012 06:59:53 +0000 (UTC)
From: "Arun C Murthy (Assigned) (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Assigned] (MAPREDUCE-3784) maxActiveApplications(|PerUser)
 per queue is too low for small clusters
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     [ https://issues.apache.org/jira/browse/MAPREDUCE-3784?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Arun C Murthy reassigned MAPREDUCE-3784:
----------------------------------------

    Assignee: Arun C Murthy
    
> maxActiveApplications(|PerUser) per queue is too low for small clusters
> -----------------------------------------------------------------------
>
>                 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
>            Assignee: Arun C Murthy
>
> 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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