Ceph » CephFS

original description¶

Memory is leaking every time when you see in monitor log:

mon.0@0(leader).mds e1 warning, MDS mds.? XXX.XXX.XXX.XXX:6800/1494583 up but filesystem disabled

Is not very noticeable, however when cluster is in unstable state, e.g. network cards are dropping random packets, monitors tend to fall into election loop. When two monitors are marking themselves as leaders for a while and then start election from the beginning, MDS messages are forwarded from one to another (to leader). After a while amount of MDS messages is quite big and when they hit monitor which is leader (at that point of time) memory leak is very visible and it leads to OOM kill.

This will only occur on disabled / not configured MDS.

Bug lasts until ceph v10.0.5.

https://github.com/ceph/ceph/pull/10238