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https://issues.apache.org/jira/browse/AURORA-122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13882433#comment-13882433
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Bill Farner commented on AURORA-122:
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https://reviews.apache.org/r/17372/
> Introduce a task store secondary index on slave host
> ----------------------------------------------------
>
> Key: AURORA-122
> URL: https://issues.apache.org/jira/browse/AURORA-122
> Project: Aurora
> Issue Type: Story
> Components: Scheduler
> Reporter: Bill Farner
> Assignee: Bill Farner
>
> We've observed the {{resourceOffers}} callback taking longer than desired in
> large clusters. Timing has indicated that they take as long as 100ms
> regularly, with occasional calls taking as long as a minute. We've narrowed
> down the majority of time spent to be performing expensive task store queries
> by slave host (in {{GcExecutorLauncher}}. When lots of hosts and tasks are
> present, these calls should be considerably faster if we maintain a index on
> slave host to avoid full task store scans.
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