Bug 1737660

Summary:	e2e-azure - etcd server overloaded
Product:	OpenShift Container Platform	Reporter:	Kirsten Garrison <kgarriso>
Component:	Etcd	Assignee:	Sam Batschelet <sbatsche>
Status:	CLOSED ERRATA	QA Contact:	ge liu <geliu>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	4.2.0	CC:	mfojtik, sbatsche, wking
Target Milestone:	---
Target Release:	4.2.0
Hardware:	Unspecified
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Last Closed:	2019-10-16 06:34:48 UTC	Type:	Bug
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Description Kirsten Garrison 2019-08-06 01:22:52 UTC

Description of problem:

When running the new e2e-azure tests I am noticing that frequently we are seeing:
"etcdserver: server is likely overloaded" messages in the logs

Version-Release number of selected component (if applicable):
Current masters in installer & release

How reproducible:
- run e2e-azure in master
- if e2e test fails check etcd-member.logs and note that you will often see a significant number (~30-140) of `etcdserver: server is likely overloaded`

Actual results:
Many `etcdserver: server is likely overloaded` in logs

Expected results:
0 to a small handful (5-7) of `etcdserver: server is likely overloaded` in logs

Additional info:
example failed runs: 
https://storage.googleapis.com/origin-ci-test/pr-logs/pull/openshift_release/4582/rehearse-4582-pull-ci-openshift-cluster-ingress-operator-master-e2e-azure/2/artifacts/e2e-azure/pods/openshift-etcd_etcd-member-ci-op-3zqg2wdp-cb8da-5kszg-master-0_etcd-member.log

https://storage.googleapis.com/origin-ci-test/pr-logs/pull/openshift_release/4582/rehearse-4582-pull-ci-openshift-cluster-ingress-operator-master-e2e-azure/3/artifacts/e2e-azure/pods/openshift-etcd_etcd-member-ci-op-9i9cd5vv-cb8da-cmm9v-master-0_etcd-member.log

For open PRs with e2e-azure runs see: 
https://github.com/openshift/release/pull/4582 
https://github.com/openshift/installer/pull/2123

Comment 5 Sam Batschelet 2019-08-08 20:24:56 UTC

After further exploration from the team, it was found that setting ReadOnly[1] cache for Azure made a considerable improvement to disk I/O.

[1] https://github.com/openshift/installer/pull/2186

Comment 7 ge liu 2019-09-03 07:04:30 UTC

hi Sam, do you have any suggestion for how to verify it, thanks in advance!

Comment 8 ge liu 2019-09-11 02:41:43 UTC

I can't open e2e test url, so I could not check the msg report situation, but I suppose it be fixed for it finish many rounds of regression test already.

Comment 9 errata-xmlrpc 2019-10-16 06:34:48 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, 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/RHBA-2019:2922