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From "Arun C Murthy (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-3784) maxActiveApplications(|PerUser) per queue is too low for small clusters
Date Thu, 02 Feb 2012 20:04:55 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-3784?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Arun C Murthy updated MAPREDUCE-3784:
-------------------------------------

    Attachment: MAPREDUCE-3784.patch

Changed to use queue max-cap in calculation of maxActiveApps.
                
> 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: 0.23.0
>            Reporter: Ramya Sunil
>            Assignee: Arun C Murthy
>             Fix For: 0.23.1
>
>         Attachments: MAPREDUCE-3784.patch, MAPREDUCE-3784.patch, MAPREDUCE-3784.patch,
MAPREDUCE-3784.patch
>
>
> 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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