Bug 2052056

Summary:	Static pod installer should throttle creating new revisions
Product:	OpenShift Container Platform	Reporter:	Michal Fojtik <mfojtik>
Component:	Etcd	Assignee:	Allen Ray <alray>
Status:	CLOSED ERRATA	QA Contact:	ge liu <geliu>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	4.11	CC:	deads, wking
Target Milestone:	---
Target Release:	4.11.0
Hardware:	Unspecified
OS:	Unspecified
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Clone Of:
Clones:	2053148 (view as bug list)		Environment:
Last Closed:	2022-08-10 10:47:58 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:	2053148

Description Michal Fojtik 2022-02-08 15:36:57 UTC

Description of problem:

Recently we have seen evidence of etcd operator (and other operators that run static pod installers) that in some cases (usually during install) there are multiple revisions being installed in a short time (sometimes a few seconds between), which might trigger a race condition(s) in kubelet when it comes to running these static pods.

In some cases, 5 or 6 revisions are being installed on a single master node within 40 seconds (during installation). 

We should throttle the rate of how often the static pod installer creates new revisions on a node to decrease kubelet utilization a minimize possible side effects.


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

4.11
4.10

How reproducible:


Steps to Reproduce:
1.
2.
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Actual results:


Expected results:


Additional info:

Comment 2 David Eads 2022-02-10 15:51:24 UTC

these fixes already merged in PRs around https://github.com/openshift/cluster-kube-scheduler-operator/pull/407

Comment 4 ge liu 2022-03-09 10:13:43 UTC

Tried several rounds of test with 4.11.0-0.nightly-2022-02-24-054925,
8 revisions in 20 minutes, it should be acceptable improvement according to https://bugzilla.redhat.com/show_bug.cgi?id=2053148#c5

Comment 6 errata-xmlrpc 2022-08-10 10:47:58 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 (Important: OpenShift Container Platform 4.11.0 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-2022:5069