Ceph » CephFS

Patrick Donnelly wrote:

Jos Collin wrote:

ceph-mds shows `starting * at -` for invalid MDS id.

$ ./bin/ceph-mds -i 42
2018-02-22 20:23:25.624 7f11d628b080 -1 deprecation warning: MDS id 'mds.42' is invalid and will be forbidden in a future version. MDS names may not start with a numeric digit.
starting mds.42 at -

This is not a bug? What's "invalid" is that the MDS may not have any caps to use so it can't connect to anything? What eventually happens to the mds process?

1. MDS id other than the default a,b,c
   $ ./bin/ceph-mds -i otherid
   starting mds.otherid at -

What's wrong with this?

With the above two commands, actually the mds process shuts down (goto shutdown). But no appropriate message is printed. It looks like the process is still running. That's how I started debugging it.

$ ./bin/ceph-mds -i a
starting mds.a at -
2018-02-23 11:00:48.606 7f568eb08080 -1 open: failed to lock pidfile /home/jcollin/workspace/ceph/build/out/mds.a.pid because another process locked it.

Were you already running mds.a?

Yes. I think this error message is fine. No problem with this.

https://github.com/ceph/ceph/pull/20541