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From "Maxim Khutornenko (JIRA)" <j...@apache.org>
Subject [jira] [Created] (AURORA-1219) Improve preemptor efficiency
Date Mon, 23 Mar 2015 17:47:10 GMT
Maxim Khutornenko created AURORA-1219:
-----------------------------------------

             Summary: Improve preemptor efficiency
                 Key: AURORA-1219
                 URL: https://issues.apache.org/jira/browse/AURORA-1219
             Project: Aurora
          Issue Type: Task
          Components: Scheduler
            Reporter: Maxim Khutornenko


While AURORA-1158 makes the preemptor asynchronous and helps scheduling loop performance,
it loses some preemption efficiency due to adapting the original algorithm to work asynchronously:
- Preemptor repeatedly searches for preemption slots with the same ClusterState increasing
the probability of victim collisions. 
- Slave/offer/resource mappings are redundantly recomputed for every pending task slot search.
- Pending tasks are repeatedly sized up against every slave (as opposed to the other way around)
making internal loop optimizations more expensive (i.e. pending task count is expected to
be << slave count under normal conditions).



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