Preemption does not obey job priority
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Key: MAPREDUCE-2210
URL: https://issues.apache.org/jira/browse/MAPREDUCE-2210
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: jobtracker
Reporter: Adam Kramer
Preemption, as it currently works, kills running tasks that are "unfair" in
terms of the amount of task attention used by one job compared to another.
The bug is that pre-emption occurs such that HIGH priority jobs have their
tasks killed when the cluster is filled with lower-priority jobs. Pre-emption
should only be allowed to kill tasks for jobs with equal or lower priority.
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