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Bug 1421834

Summary:	Metrics Resolution of Heapster Image Should be 30s to Match cAdvisor
Product:	OpenShift Container Platform	Reporter:	Solly Ross <sross>
Component:	Hawkular	Assignee:	Matt Wringe <mwringe>
Status:	CLOSED ERRATA	QA Contact:	Peng Li <penli>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	3.5.0	CC:	aos-bugs, ekuric, jeder, mifiedle, sross, tdawson
Target Milestone:	---
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	aos-scalability-35
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:
Clones:	1421860 (view as bug list)		Environment:
Last Closed:	2017-04-12 19:12:36 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:	1421860

Description Solly Ross 2017-02-13 19:36:04 UTC

In Kubernetes, we specify a cAdvisor housekeeping interval of 10s.  cAdvisor has backoff logic that could move this up to 15s, plus jitter logic that could double that, leaving us with an actual max housekeeping interval of 30s:

https://github.com/kubernetes/kubernetes/blob/master/vendor/github.com/google/cadvisor/manager/container.go#L382.

Thus, our Heapster image needs to have a metrics_resolution of at least 30s
in order to avoid reading the same metrics batch twice from the node, which causes Heapster to skip rate calculation, which causes CPU metrics to not appear.

Comment 1 Matt Wringe 2017-02-13 19:37:41 UTC

Does this only need to be applied to 3.5? or is this logic also in older versions like 3.4?

Comment 2 Matt Wringe 2017-02-13 21:45:21 UTC

The templates should now be updated to support the increased value.

Comment 3 Peng Li 2017-02-14 01:06:48 UTC

Verified with openshift-ansible master branch, https://github.com/openshift/openshift-ansible/blob/master/roles/openshift_metrics/defaults/main.yaml, the default value has been set from 15s to 30s.

Comment 6 errata-xmlrpc 2017-04-12 19:12:36 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-2017:0884