Note: This bug is displayed in read-only format because the product is no longer active in Red Hat Bugzilla.

Bug 1939922

Summary:	Descheduler profile triggers needless stateful pods needlessly
Product:	OpenShift Container Platform	Reporter:	Fabian Deutsch <fdeutsch>
Component:	kube-scheduler	Assignee:	Mike Dame <mdame>
Status:	CLOSED DEFERRED	QA Contact:	RamaKasturi <knarra>
Severity:	urgent	Docs Contact:
Priority:	high
Version:	4.7	CC:	aos-bugs, gausingh, jhopper, mfojtik, mfuruta
Target Milestone:	---
Target Release:	4.8.0
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-04-08 19:56:44 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Fabian Deutsch 2021-03-17 10:17:51 UTC

Description of problem:
In CNV we are looking at leveraging the LowNodeUtilization strategy of the LifecycleAndUtilization profile to balance out a cluster after upgrade.

However, the PodLifeTime is also part of this profile. This will trigger needless VM live migrations every 24hrs, because running pods will be evicted by this strategy.

A profile is needed that is exclusively focused on balancing the cluster according to load - spreak retroactively, not proactively.

Version-Release number of selected component (if applicable):
4.7

How reproducible:
Always

Steps to Reproduce:
1. Create a CNV VM, wait 2 days
2. Run descheduler with LifecycleAndUtilization profile
3. 

Actual results:
VM will be rescheduled even if the cluster is balanced

Expected results:
VM will not be scheduled because the cluster is balanced

Additional info:

Comment 2 Mike Dame 2021-03-18 14:41:34 UTC

I commented in https://issues.redhat.com/browse/CNV-10289, but this will likely actually need an RFE to expose any additional settings in the Descheduler Operator

Comment 3 Gaurav Singh 2021-03-18 14:53:14 UTC

There RFE to track this request 

https://issues.redhat.com/browse/RFE-1711