Bug 1889912

Summary:	Drains can cause high CPU usage
Product:	OpenShift Container Platform	Reporter:	Ryan Phillips <rphillips>
Component:	Machine Config Operator	Assignee:	Ryan Phillips <rphillips>
Status:	CLOSED ERRATA	QA Contact:	Sunil Choudhary <schoudha>
Severity:	high	Docs Contact:
Priority:	medium
Version:	4.6	CC:	baiesi, jerzhang, oarribas, schoudha, sjenning, tgabriel
Target Milestone:	---
Target Release:	4.7.0
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	No Doc Update
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-02-24 15:27:07 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:
Bug Depends On:
Bug Blocks:	1869362, 1893483

Description Ryan Phillips 2020-10-20 21:50:58 UTC

Description of problem:

Saw this merged upstream PR fixing high CPU usage on drains. https://github.com/kubernetes/kubernetes/pull/95260. 

The MCO uses the same/similar code on upgrades as well: https://github.com/openshift/machine-config-operator/blob/08ddac370a125ac1b72c5b80069efd8ae31489b6/vendor/k8s.io/kubectl/pkg/drain/drain.go#L321

We need to backport the patch to 4.6, and likely 4.5 as well.

Comment 2 Kirsten Garrison 2020-10-21 17:28:07 UTC

The current fix is in kubectl master and 1.20 isn't cut yet(that's December) so I have to wait until the backport hits 1.19 via https://github.com/kubernetes/kubernetes/pull/95710 and can get it from there.

Comment 5 Ryan Phillips 2020-11-10 15:39:06 UTC

*** Bug 1891412 has been marked as a duplicate of this bug. ***

Comment 6 Ryan Phillips 2020-11-11 14:00:44 UTC

*** Bug 1882000 has been marked as a duplicate of this bug. ***

Comment 9 errata-xmlrpc 2021-02-24 15:27:07 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 4.7.0 security, bug fix, and enhancement 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-2020:5633

Comment 11 Red Hat Bugzilla 2023-09-15 00:49:59 UTC

The needinfo request[s] on this closed bug have been removed as they have been unresolved for 500 days