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Fix #58023
openmds: do not evict clients if OSDs are laggy
Status:
Pending Backport
Priority:
High
Assignee:
Category:
Correctness/Safety
Target version:
% Done:
0%
Source:
Development
Tags:
backport_processed
Backport:
reef,quincy,pacific
Reviewed:
Affected Versions:
ceph-qa-suite:
Description
Monitoring perf dumps from the MDS can sometimes show that OSDs are laggy, "objecter.op_laggy" and "objecter.osd_laggy". This can indicate the cause for laggy clients (cannot flush dirty data for cap revokes).
In Server::find_idle_sessions, if the MDS detects laggy OSDs, 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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