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https://issues.apache.org/jira/browse/MAPREDUCE-1845?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Scott Chen updated MAPREDUCE-1845:
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Priority: Major (was: Minor)
I am changing this to major because this is a serious problem for preemption.
The jobs which are supposed to be preempt (running task > fairshare) will
actually generate negative tasksToPreempt.
That makes the total number of tasks to preemption go down.
This actually makes them able to escape from preemption.
> FairScheduler.tasksToPeempt() can return negative number
> --------------------------------------------------------
>
> Key: MAPREDUCE-1845
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1845
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: contrib/fair-share
> Affects Versions: 0.22.0
> Reporter: Scott Chen
> Assignee: Scott Chen
> Fix For: 0.22.0
>
>
> This method can return negative number. This will cause the preemption to
> under-preempt.
> The bug was discovered by Joydeep.
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