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From "Maxim Khutornenko (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AURORA-1219) Improve preemptor efficiency
Date Tue, 14 Apr 2015 20:06:59 GMT

    [ https://issues.apache.org/jira/browse/AURORA-1219?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14494772#comment-14494772
] 

Maxim Khutornenko commented on AURORA-1219:
-------------------------------------------

https://reviews.apache.org/r/32907/

> 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
>            Assignee: 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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