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https://issues.apache.org/jira/browse/MAPREDUCE-1485?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Allen Wittenauer resolved MAPREDUCE-1485.
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Resolution: Fixed
user limits were implemented.
> CapacityScheduler should have prevent a single job taking over large parts of
> a cluster
> ---------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-1485
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1485
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: capacity-sched
> Reporter: Arun C Murthy
> Assignee: Arun C Murthy
>
> The proposal is to have a per-queue limit on the number of concurrent tasks a
> job can run on a cluster.
> We've seen cases where a single, large, job took over a majority of the
> cluster - worse, it meant that any bug in it caused issues for both the
> NameNode _and_ the JobTracker.
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