[jira] [Updated] (YUNIKORN-2212) Don't collect requests that hasn't been scheduled yet or already triggered scale up

["Peter Bacsko (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/YUNIKORN-2212?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Peter Bacsko updated YUNIKORN-2212:
-----------------------------------
    Summary: Don't collect requests that hasn't been scheduled yet or already triggered scale up  (was: Request should not be outstanding if scheduling has not been attempted)

> Don't collect requests that hasn't been scheduled yet or already triggered scale up
> -----------------------------------------------------------------------------------
>
>                 Key: YUNIKORN-2212
>                 URL: https://issues.apache.org/jira/browse/YUNIKORN-2212
>             Project: Apache YuniKorn
>          Issue Type: Bug
>          Components: core - scheduler
>            Reporter: Peter Bacsko
>            Assignee: Peter Bacsko
>            Priority: Major
>              Labels: pull-request-available
>         Attachments: outstandingRequests-1.png
>
>
> In every second, we collect "outstanding requests", ie those which cannot be scheduled.
> Problem is, the scheduling cycle might not even tried to schedule those pods. If that's the case, we mistakenly set them to "Unschedulable", which can trigger autoscaling if the cluster autoscaler happens to run at the beginning of the next scan interval.
> Another thing to consider is when we need to mark them as Unschedulable. Eg. tryPreemption() succeeded, do we still need new nodes? This can addressed in a separate JIRA.
> This issue also shows up during performance testing. Since we submit a lot of pods to Yunikorn, {{Scheduler.inspectOutstandingRequests()}} finds&collects them and subsequently generates a lot of API server updates. This is a special edge case, but on busy clusters, something similar can happen.



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