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https://issues.apache.org/jira/browse/HADOOP-4211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12633385#action_12633385
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Owen O'Malley commented on HADOOP-4211:
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There isn't preemption between users in the same queue. Did you observe J1
getting more map slots after J2 was submitted, but before J2 reached 50%? And
similarly for the second case?
> Capacity Scheduler does not divide queue resources properly among users, when
> jobs are submitted one after other.
> -----------------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-4211
> URL: https://issues.apache.org/jira/browse/HADOOP-4211
> Project: Hadoop Core
> Issue Type: Bug
> Components: contrib/capacity-sched
> Affects Versions: 0.19.0
> Environment: Mapred Cluster capacity with 204 Maps and 204 Reduces.
> User limit =25% and only one queue.
> Reporter: Karam Singh
> Assignee: Hemanth Yamijala
> Priority: Blocker
> Fix For: 0.19.0
>
>
> Capacity Scheduler does not divide queue resources properly among users,
> when job are submitted one after other. E.g. user limit =25. Say User1's job
> is running. Then user2 submits a job. Then user1's job uses 75% and user2's
> job 25%=user limit.
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