some further investigation about three mds with trimming behind problem: logs captured over two days show that, some log segments are stuck in trimming process. It looks like a bug with trimming log segment? Any thoughts? ==========log capture============ 9/26: debug 2023-09-26T16:50:59.004+0000 7fc74d95e700 10 mds.3.log _trim_expired_segments waiting for 197465903/720757956586 to expire debug 2023-09-26T16:45:22.788+0000 7f9c253a8700 10 mds.4.log _trim_expired_segments waiting for 195341004/893374309813 to expire debug 2023-09-26T14:11:37.681+0000 7f8f047cf700 10 mds.5.log _trim_expired_segments waiting for 189942575/642272326541 to expire 9/27: debug 2023-09-27T15:35:04.841+0000 7fc74d95e700 10 mds.3.log _trim_expired_segments waiting for 197465903/720757956586 to expire debug 2023-09-27T15:18:51.442+0000 7f9c29bb1700 10 mds.4.log _trim_expired_segments waiting for 195341004/893374309813 to expire debug 2023-09-27T15:27:33.024+0000 7f8f047cf700 10 mds.5.log _trim_expired_segments waiting for 189942575/642272326541 to expire Regards, Ben Ben <ruidong.gao@gmail.com> 于2023年9月26日周二 20:31写道：
Hi, see below for details of warnings. the cluster is running 17.2.5. the warnings have been around for a while. one concern of mine is num_segments growing over time. clients with warn of MDS_CLIENT_OLDEST_TID increase from 18 to 25 as well. The nodes are with kernel 4.19.0-91.82.42.uelc20.x86_64. It looks like bugs with client library. And rebooting nodes with problem will fix it for short period of time? Any suggestions from community for fixing?
Thanks, Ben
[root@8cd2c0657c77 /]# ceph health detail
HEALTH_WARN 6 hosts fail cephadm check; 2 clients failing to respond to capability release; 25 clients failing to advance oldest client/flush tid; 3 MDSs report slow requests; 3 MDSs behind on trimming
[WRN] CEPHADM_HOST_CHECK_FAILED: 6 hosts fail cephadm check
host host15w (192.168.31.33) failed check: Unable to reach remote host host15w. Process exited with non-zero exit status 1
host host20w (192.168.31.38) failed check: Unable to reach remote host host20w. Process exited with non-zero exit status 1
host host19w (192.168.31.37) failed check: Unable to reach remote host host19w. Process exited with non-zero exit status 1
host host17w (192.168.31.35) failed check: Unable to reach remote host host17w. Process exited with non-zero exit status 1
host host18w (192.168.31.36) failed check: Unable to reach remote host host18w. Process exited with non-zero exit status 1
host host16w (192.168.31.34) failed check: Unable to reach remote host host16w. Process exited with non-zero exit status 1
[WRN] MDS_CLIENT_LATE_RELEASE: 2 clients failing to respond to capability release
mds.code-store.host18w.fdsqff(mds.1): Client k8s-node36 failing to respond to capability release client_id: 460983
mds.code-store.host16w.vucirx(mds.3): Client failing to respond to capability release client_id: 460983
[WRN] MDS_CLIENT_OLDEST_TID: 25 clients failing to advance oldest client/flush tid
mds.code-store.host18w.fdsqff(mds.1): Client k8s-node36 failing to advance its oldest client/flush tid. client_id: 460983
mds.code-store.host18w.fdsqff(mds.1): Client failing to advance its oldest client/flush tid. client_id: 460226
mds.code-store.host18w.fdsqff(mds.1): Client k8s-node32 failing to advance its oldest client/flush tid. client_id: 239797
mds.code-store.host15w.reolpx(mds.5): Client k8s-node34 failing to advance its oldest client/flush tid. client_id: 460226
mds.code-store.host15w.reolpx(mds.5): Client k8s-node32 failing to advance its oldest client/flush tid. client_id: 239797
mds.code-store.host15w.reolpx(mds.5): Client failing to advance its oldest client/flush tid. client_id: 460983
mds.code-store.host18w.rtyvdy(mds.7): Client k8s-node34 failing to advance its oldest client/flush tid. client_id: 460226
mds.code-store.host18w.rtyvdy(mds.7): Client failing to advance its oldest client/flush tid. client_id: 239797
mds.code-store.host18w.rtyvdy(mds.7): Client k8s-node36 failing to advance its oldest client/flush tid. client_id: 460983
mds.code-store.host17w.kcdopb(mds.2): Client failing to advance its oldest client/flush tid. client_id: 239797
mds.code-store.host17w.kcdopb(mds.2): Client failing to advance its oldest client/flush tid. client_id: 460983
mds.code-store.host17w.kcdopb(mds.2): Client k8s-node34 failing to advance its oldest client/flush tid. client_id: 460226
mds.code-store.host17w.kcdopb(mds.2): Client k8s-node24 failing to advance its oldest client/flush tid. client_id: 12072730
mds.code-store.host20w.bfoftp(mds.4): Client k8s-node32 failing to advance its oldest client/flush tid. client_id: 239797
mds.code-store.host20w.bfoftp(mds.4): Client k8s-node36 failing to advance its oldest client/flush tid. client_id: 460983
mds.code-store.host19w.ywrmiz(mds.6): Client k8s-node24 failing to advance its oldest client/flush tid. client_id: 12072730
mds.code-store.host19w.ywrmiz(mds.6): Client k8s-node34 failing to advance its oldest client/flush tid. client_id: 460226
mds.code-store.host19w.ywrmiz(mds.6): Client failing to advance its oldest client/flush tid. client_id: 239797
mds.code-store.host19w.ywrmiz(mds.6): Client failing to advance its oldest client/flush tid. client_id: 460983
mds.code-store.host16w.vucirx(mds.3): Client failing to advance its oldest client/flush tid. client_id: 460983
mds.code-store.host16w.vucirx(mds.3): Client failing to advance its oldest client/flush tid. client_id: 460226
mds.code-store.host16w.vucirx(mds.3): Client failing to advance its oldest client/flush tid. client_id: 239797
mds.code-store.host17w.pdziet(mds.0): Client k8s-node32 failing to advance its oldest client/flush tid. client_id: 239797
mds.code-store.host17w.pdziet(mds.0): Client k8s-node34 failing to advance its oldest client/flush tid. client_id: 460226
mds.code-store.host17w.pdziet(mds.0): Client k8s-node36 failing to advance its oldest client/flush tid. client_id: 460983
[WRN] MDS_SLOW_REQUEST: 3 MDSs report slow requests
mds.code-store.host15w.reolpx(mds.5): 4 slow requests are blocked > 5 secs
mds.code-store.host20w.bfoftp(mds.4): 6 slow requests are blocked > 5 secs
mds.code-store.host16w.vucirx(mds.3): 97 slow requests are blocked > 5 secs
[WRN] MDS_TRIM: 3 MDSs behind on trimming
mds.code-store.host15w.reolpx(mds.5): Behind on trimming (25831/128) max_segments: 128, num_segments: 25831
mds.code-store.host20w.bfoftp(mds.4): Behind on trimming (27605/128) max_segments: 128, num_segments: 27605
mds.code-store.host16w.vucirx(mds.3): Behind on trimming (28676/128) max_segments: 128, num_segments: 28676