Bug #16919: MDS: Standby replay daemons don't drop purged strays - CephFS - Ceph

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Bug #16919

closed

MDS: Standby replay daemons don't drop purged strays

Added by John Spray over 7 years ago. Updated over 7 years ago.

Status:

Resolved

Priority:

Normal

Assignee:

John Spray

Category:

Code Hygiene

Target version:

% Done:

Source:

other

Tags:

Backport:

Regression:

Severity:

3 - minor

Reviewed:

Affected Versions:

ceph-qa-suite:

Component(FS):

MDS

Labels (FS):

Pull request ID:

Crash signature (v1):

Crash signature (v2):

Description

This is not fatal, because the inodes will ultimately end up at the top of the LRU list and get trimmed, but it's a weird behaviour and it leads to standby-replay daemons (and by extension active daemons when a failure happens) having inflated caches.

Reproduce by just running one active and one standby-replay, and then create and delete a load of files, unmount a client and flush the journal: you'll see the active daemon's inode count fall back down, but the inode count on the standby-replay will remain high, and if you dump its cache you can see all the strays.