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https://issues.apache.org/jira/browse/YUNIKORN-3386?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dale Richardson reassigned YUNIKORN-3386:
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Assignee: Dale Richardson
> Chaos scenarios for preemption under fault injection.
> -----------------------------------------------------
>
> Key: YUNIKORN-3386
> URL: https://issues.apache.org/jira/browse/YUNIKORN-3386
> Project: Apache YuniKorn
> Issue Type: Test
> Components: core - scheduler, shim - kubernetes
> Reporter: Dale Richardson
> Assignee: Dale Richardson
> Priority: Major
>
> h3. Design
> A tight two-queue guaranteed/max config (built as a reusable helper) so
> filling
> the low-priority queue forces preemption when a high-priority wave arrives.
> Fault
> axes: bind failure on the high-priority pods, delete failure on victims (the
> second
> consumer of the create/delete loopback -- victim deletion goes through task
> release
> -> KubeClient.Delete), and node flap during the preemption window. Oracles: P1
> victim accounting (a deleted victim is gone from both sides; an undeleted
> victim is
> characterised in full), P2 no lost pods, P3 no double-count / no node
> over-capacity
> at settle (O6 covers), P4 the system settles.
> h3. Results
> Control green with a hard non-vacuity assertion: on a full cluster the wave
> triggers real PREEMPTED_BY_SCHEDULER victim deletes and low-queue usage drops
> while
> high-queue usage rises (a control that preempts nothing is rejected). The
> delete-failure axis is red-by-design and produced the finding filed as
> YUNIKORN-3382: one failed victim delete permanently wedges the preemption
> (victim
> stays IsPreempted, queue preemptingResource never returns to zero, the
> high-priority ask starves). The node-flap axis reproduced the YUNIKORN-3375
> overcommit in full (core believes the cluster is idle while pods run).
> h3. Note
> Red-by-design until YUNIKORN-3382 is fixed; draft per the YUNIKORN-3377
> precedent.
> The tight-capacity config doubles as the demonstration config for the
> YUNIKORN-3375
> queue-overcommit consequence.
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