[jira] [Assigned] (YUNIKORN-3241) Fence root search bug when queue is at max capacity

["Wilfred Spiegelenburg (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/YUNIKORN-3241?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wilfred Spiegelenburg reassigned YUNIKORN-3241:
-----------------------------------------------

    Assignee: Victor Zhou

> Fence root search bug when queue is at max capacity
> ---------------------------------------------------
>
>                 Key: YUNIKORN-3241
>                 URL: https://issues.apache.org/jira/browse/YUNIKORN-3241
>             Project: Apache YuniKorn
>          Issue Type: Bug
>          Components: core - scheduler
>            Reporter: Victor Zhou
>            Assignee: Victor Zhou
>            Priority: Major
>              Labels: Yunikorn-core, bug, preemption, pull-request-available
>             Fix For: 1.9.0
>
>
> h3. Description
> [findPreemptionFenceRoot() |https://github.com/apache/yunikorn-core/blob/master/pkg/scheduler/objects/queue.go#L2201]in pkg/scheduler/objects/queue.go only fenced on max when allocated == max.
> Allocated equals max exactly is a pretty rare case, and this misses cases where a queue is not yet full, but the incoming ask would bring it to or beyond max (allocated + ask >= max), causing preemption scope to be computed too broadly.
> h3. Root Cause
> Fence-root max check was based on current allocation equality only, without considering the pending ask resource.



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