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Bug 1989722

Summary:	Descheduler operator should allow eviction based on soft topology constraints
Product:	OpenShift Container Platform	Reporter:	Mike Dame <mdame>
Component:	kube-scheduler	Assignee:	Mike Dame <mdame>
Status:	CLOSED ERRATA	QA Contact:	RamaKasturi <knarra>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	4.8	CC:	aos-bugs, knarra, mfojtik
Target Milestone:	---
Target Release:	4.9.0
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Enhancement
Doc Text:	Descheduler now allows pods with soft topology constraints to be evicted by the SoftTopologyAndDuplicates profile	Story Points:	---
Clone Of:	1989720	Environment:
Last Closed:	2021-10-18 17:44:27 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Mike Dame 2021-08-03 19:38:20 UTC

The Descheduler operator should provide users with the ability to evict pods using soft (`ScheduleAnyway`) topology spread constraints. This is possible upstream, but needs to be exposed as an option (or additional profile) in the operator

Comment 2 RamaKasturi 2021-08-09 16:06:24 UTC

currently blocked on this due to bug https://bugzilla.redhat.com/show_bug.cgi?id=1990603

Comment 3 RamaKasturi 2021-08-14 16:39:23 UTC

Hello Mike,

   I have a question related to SoftTopologyAndDuplicates / TopologyAndDuplicates. I have performed below tests.

First Test:
=========================
1) Enabled SoftTopologyAndDuplicates
2) created  pods according to test [1], WhenUnsatisfiable set to "ScheduleAnyway"
3) I see that pods got evicted due to PodTopologySpread

Second Test:
======================
1) Enabled SoftTopologyAndDuplicates
2) created pods according to test [2] , WhenUnsatisfiable set to "DoNotSchedule"
3) I see that pods got evicted in a similar fashion.

I expected SecondTest not to evict any pods as the profile set here is "SoftTopologyAndDuplicates", could you please help confirm why the pods got evicted even though the profile set was "SoftTopologyAndDuplicates" ? 

[1] https://polarion.engineering.redhat.com/polarion/#/project/OSE/workitem?id=OCP-43283
[2] https://polarion.engineering.redhat.com/polarion/#/project/OSE/workitem?id=OCP-40055

Thanks
kasturi

Comment 4 Mike Dame 2021-08-16 14:28:43 UTC

@Rama The SoftTopologyAndDuplicates profile will evict both ScheduleAnyway AND DoNotSchedule pods, so this is working as expected.

Comment 5 RamaKasturi 2021-08-23 09:26:56 UTC

Thanks Mike, Moving the bug to verified state based on comment 3 & comment 4.

Comment 8 errata-xmlrpc 2021-10-18 17:44:27 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: OpenShift Container Platform 4.9.0 bug fix and security update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2021:3759