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https://issues.apache.org/jira/browse/AURORA-117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13906105#comment-13906105
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Bill Farner commented on AURORA-117:
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https://reviews.apache.org/r/18157/
> Scheduler performance issues with very large jobs
> -------------------------------------------------
>
> Key: AURORA-117
> URL: https://issues.apache.org/jira/browse/AURORA-117
> Project: Aurora
> Issue Type: Task
> Components: Reliability, Scheduler
> Reporter: Bill Farner
> Assignee: Bill Farner
> Labels: O1
>
> The scheduler tends to have performance issues when scheduling very large
> jobs. We've observed this with jobs exceeding 2000 instances. The
> {{TaskScheduler}} thread tends to consume a large amount of CPU (100%,
> limited by the global storage lock). Current hypothesis is that the majority
> of the time is spent satisfying diversity constraints (rack, machine), which
> require expensive queries.
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