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From "Adam Kramer (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-2210) Preemption does not obey job priority
Date Mon, 06 Dec 2010 06:32:10 GMT
Preemption does not obey job priority
-------------------------------------

                 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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