Hi,
I'm using cephfs as a storage layer for a database.
And seeing the following message in the health warning of ceph-
```
# ceph health detail
HEALTH_WARN 1 clients failing to respond to capability release
[WRN] MDS_CLIENT_LATE_RELEASE: 1 clients failing to respond to capability
release
mds.ceph-mon-2(mds.0): Client client-3-4:cephfs failing to respond to
capability release client_id: 2100909
```
And the `mds session ls` output for the client is:
```
{
"id": 2100909,
"entity": {
"name": {
"type": "client",
"num": 2100909
},
"addr": {
"type": "v1",
"addr": "xxxx",
"nonce": 2770840461
}
},
"state": "open",
"num_leases": 0,
"num_caps": 507799,
"request_load_avg": 1066,
"uptime": 274389.13036294398,
"requests_in_flight": 0,
"completed_requests": 0,
"reconnecting": false,
"recall_caps": {
"value": 0,
"halflife": 60
},
"release_caps": {
"value": 0,
"halflife": 60
},
"recall_caps_throttle": {
"value": 0,
"halflife": 1.5
},
"recall_caps_throttle2o": {
"value": 0,
"halflife": 0.5
},
"session_cache_liveness": {
"value": 9665.2693316477944,
"halflife": 300
},
"cap_acquisition": {
"value": 0,
"halflife": 10
},
"inst": "client.2100909 v1:xxxx:0/2770840461",
"completed_requests": [],
"prealloc_inos": [],
"used_inos": [],
"client_metadata": {
"client_features": {
"feature_bits": "0x0000000000007bff"
},
"metric_spec": {
"metric_flags": {
"feature_bits": "0x000000000000001f"
}
},
"entity_id": "cephfs",
"hostname": "client-3-4",
"kernel_version": "5.11.0-1024-gcp",
"root": "/"
}
},
```
ceph version: `15.2.13 (c44bc49e7a57a87d84dfff2a077a2058aa2172e2) octopus
(stable)`
client kernel version: `Linux 5.11.0-1023-gcp`
debug details-
```
# cat /sys/kernel/debug/ceph/*/osdc
REQUESTS 0 homeless 0
LINGER REQUESTS
BACKOFFS
# cat /sys/kernel/debug/ceph/*/caps
total 508281
avail 45
used 508230
reserved 6
min 1024
# Nothing in mdsc
```
The above warning seems to go away after some time, but it pops up multiple
times a day with different clients. It also seems to go away for some time
after I drop the cache using `echo 3 > /proc/sys/vm/drop_caches`.
Please suggest how do I resolve this issue permanently?
Best,
Anmol Arora
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