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Posted to issues@aurora.apache.org by "Maxim Khutornenko (JIRA)" <ji...@apache.org> on 2015/03/28 04:32:53 UTC
[jira] [Assigned] (AURORA-1219) Improve preemptor efficiency
[ https://issues.apache.org/jira/browse/AURORA-1219?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Maxim Khutornenko reassigned AURORA-1219:
-----------------------------------------
Assignee: Maxim Khutornenko
> 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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