Bug 2124417

Summary:	mgr/stats: be resilient to offline MDS rank-0
Product:	[Red Hat Storage] Red Hat Ceph Storage	Reporter:	Jos Collin <jcollin>
Component:	CephFS	Assignee:	Jos Collin <jcollin>
Status:	CLOSED ERRATA	QA Contact:	julpark
Severity:	medium	Docs Contact:
Priority:	medium
Version:	5.2	CC:	ceph-eng-bugs, cephqe-warriors, hyelloji, tserlin, vereddy, vshankar, ymane
Target Milestone:	---
Target Release:	5.3z1
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	ceph-16.2.10-102.el8cp	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2023-02-28 10:05:18 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 Jos Collin 2022-09-06 05:33:41 UTC

Description of problem:
mgr/stats can repeatedly report stale perf stats when MDS rank-0 becomes offline. Even after a standby daemon transitions to active rank-0, the metrics reported are still stale.
To fix this, reregister user queries when a new MDS rank-0 is seen.

Version-Release number of selected component (if applicable):
5.3

How reproducible:
Always

Steps to Reproduce:
1. Create a filesystem, mount it and run `watch ceph fs perf stats`.
2. Fail the rank0 mds.
3. `ceph fs perf stats` output shows stale metrics or no metrics.

Actual results:
`ceph fs perf stats` output shows stale metrics or no metrics.

Expected results:
`ceph fs perf stats` should display valid metrics.

Additional info:

Comment 14 errata-xmlrpc 2023-02-28 10:05:18 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: Red Hat Ceph Storage 5.3 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-2023:0980