Victor Zhou created YUNIKORN-3241:
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Summary: 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
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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