Bug 2228039

Summary:	mds: do not evict clients if OSDs are laggy
Product:	[Red Hat Storage] Red Hat Ceph Storage	Reporter:	Dhairya Parmar <dparmar>
Component:	CephFS	Assignee:	Dhairya Parmar <dparmar>
Status:	CLOSED ERRATA	QA Contact:	Hemanth Kumar <hyelloji>
Severity:	medium	Docs Contact:	Ranjini M N <rmandyam>
Priority:	unspecified
Version:	5.2	CC:	ceph-eng-bugs, cephqe-warriors, hyelloji, rmandyam, sostapov, tserlin, vshankar
Target Milestone:	---
Target Release:	5.3z6
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	ceph-16.2.10-223.el8cp	Doc Type:	Enhancement
Doc Text:	.Laggy clients are now evicted only if there are no laggy OSDs Previously, monitoring performance dumps from the MDS would sometimes show that the OSDs were laggy, `objecter.op_laggy` and `objecter.osd_laggy`, causing laggy clients (dirty data could not be flushed for cap revokes). With this enhancement, if the `defer_client_eviction_on_laggy_osds` option is set to true and a client gets laggy because of a laggy OSD then client eviction will not take place until OSDs are no longer laggy.	Story Points:	---
Clone Of:
Clones:	2228065 2228066 2260003 (view as bug list)		Environment:
Last Closed:	2024-02-08 16:50:15 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:	2228065, 2228066, 2258797, 2260003

Description Dhairya Parmar 2023-08-01 07:59:52 UTC

Description of problem: If OSD(s) is/are laggy (due to certain conditions like network cut-off, etc) then it might make clients laggy(session might get idle or cannot flush dirty data for cap revokes). Therefore have a config option that can be used to defer evicting/removing "laggy" client sessions until OSDs are no longer laggy. Log a warning to the cluster indicating the situation.


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Comment 1 RHEL Program Management 2023-08-01 08:00:02 UTC

Please specify the severity of this bug. Severity is defined here:
https://bugzilla.redhat.com/page.cgi?id=fields.html#bug_severity.

Comment 5 Scott Ostapovicz 2023-08-17 14:22:45 UTC

This is being retargeted to 5.3 z6 since it was not completed in time for the 5.3 z5 release.

Comment 14 errata-xmlrpc 2024-02-08 16:50:15 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: Red Hat Ceph Storage 5.3 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-2024:0745