I recently set up scheduled snapshots on my CephFS filesystem, and ever since
the cluster has been intermittently going into HEALTH_WARN with an
MDS_CLIENT_LATE_RELEASE notification.
Specifically:
[WARN] MDS_CLIENT_LATE_RELEASE: 1 clients failing to respond to capability
release
mds.[redacted](mds.0): Client [redacted] failing to respond to
capability release client_id: 806270628
I catch errors like this in the logs:
client.785155718 isn't responding to mclientcaps(revoke), ino 0x10004c1abc6
pending pAsLsXsFsc issued pAsLsXsFsc, sent 3844.269321 seconds ago
(Ignore the fact that the client numbers don't match in this case; one was
captured before the client was rebooted, the other after. There's only one
CephFS client and the numbers normally match.)
If left alone, the issue eventually resolves itself, then comes back at some
point in the future.
It appears to be the same as this bug: https://tracker.ceph.com/issues/49434
Which leads here: https://tracker.ceph.com/issues/57244
And then this pull request: https://github.com/ceph/ceph/pull/47752
My reading is that this is simply a matter of the MDS not recognizing that the
caps have, in fact, been released, and that I can safely ignore the warnings
until the patch percolates down to a Pacific release. Is that right, or am I
missing something significant?
-----
Edward Huyer
Golisano College of Computing and Information Sciences
Rochester Institute of Technology
Golisano 70-2373
152 Lomb Memorial Drive
Rochester, NY 14623
585-475-6651
erh...@rit.edu<mailto:erh...@rit.edu>
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