On 7/20/23 22:09, Frank Schilder wrote:
Hi all, we had a client with the warning "[WRN] MDS_CLIENT_OLDEST_TID: 1 clients failing to advance oldest client/flush tid". I looked at the client and there was nothing going on, so I rebooted it. After the client was back, the message was still there. To clean this up I failed the MDS. Unfortunately, the MDS that took over is remained stuck in rejoin without doing anything. All that happened in the log was:
BTW, are you using the kclient or user space client ? How long was the MDS stuck in rejoin state ?
This means in the client side the oldest client has been stuck too long, maybe in heavy load case there were to many requests generated in a short time and the oldest request was stuck too long in MDS.
[root@ceph-10 ceph]# tail -f ceph-mds.ceph-10.log 2023-07-20T15:54:29.147+0200 7fedb9c9f700 1 mds.2.896604 rejoin_start 2023-07-20T15:54:29.161+0200 7fedb9c9f700 1 mds.2.896604 rejoin_joint_start 2023-07-20T15:55:28.005+0200 7fedb9c9f700 1 mds.ceph-10 Updating MDS map to version 896614 from mon.4 2023-07-20T15:56:00.278+0200 7fedb9c9f700 1 mds.ceph-10 Updating MDS map to version 896615 from mon.4 [...] 2023-07-20T16:02:54.935+0200 7fedb9c9f700 1 mds.ceph-10 Updating MDS map to version 896653 from mon.4 2023-07-20T16:03:07.276+0200 7fedb9c9f700 1 mds.ceph-10 Updating MDS map to version 896654 from mon.4
Did you see any slow request log in the mds log files ? And any other suspect logs from the dmesg if it's kclient ?
After some time I decided to give another fail a try and, this time, the replacement daemon went to active state really fast. If I have a message like the above, what is the clean way of getting the client clean again (version: 15.2.17 (8a82819d84cf884bd39c17e3236e0632ac146dc4) octopus (stable))?
I think your steps are correct. Thanks - Xiubo
Thanks and best regards, ================= Frank Schilder AIT Risø Campus Bygning 109, rum S14 _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
_______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
