Re: Ceph MDS laggy

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Did this only start to happen after upgrading to 12.2.10?

Paul

-- 
Paul Emmerich

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On Sat, Jan 19, 2019 at 5:40 PM Adam Tygart <mozes@xxxxxxx> wrote:
>
> It worked for about a week, and then seems to have locked up again.
>
> Here is the back trace from the threads on the mds:
> http://people.cs.ksu.edu/~mozes/ceph-12.2.10-laggy-mds.gdb.txt
>
> --
> Adam
>
> On Sun, Jan 13, 2019 at 7:41 PM Yan, Zheng <ukernel@xxxxxxxxx> wrote:
> >
> > On Sun, Jan 13, 2019 at 1:43 PM Adam Tygart <mozes@xxxxxxx> wrote:
> > >
> > > Restarting the nodes causes the hanging again. This means that this is
> > > workload dependent and not a transient state.
> > >
> > > I believe I've tracked down what is happening. One user was running
> > > 1500-2000 jobs in a single directory with 92000+ files in it. I am
> > > wondering if the cluster was getting ready to fragment the directory
> > > something freaked out, perhaps not able to get all the caps back from
> > > the nodes (if that is even required).
> > >
> > > I've stopped that user's jobs for the time being, and will probably
> > > address it with them Monday. If it is the issue, can I tell the mds to
> > > pre-fragment the directory before I re-enable their jobs?
> > >
> >
> > The log shows mds is in busy loop, but doesn't show where is it. If it
> > happens again, please use gdb to attach ceph-mds, then type 'set
> > logging on' and 'thread apply all bt' inside gdb. and send the output
> > to us
> >
> > Yan, Zheng
> > > --
> > > Adam
> > >
> > > On Sat, Jan 12, 2019 at 7:53 PM Adam Tygart <mozes@xxxxxxx> wrote:
> > > >
> > > > On a hunch, I shutdown the compute nodes for our HPC cluster, and 10
> > > > minutes after that restarted the mds daemon. It replayed the journal,
> > > > evicted the dead compute nodes and is working again.
> > > >
> > > > This leads me to believe there was a broken transaction of some kind
> > > > coming from the compute nodes (also all running CentOS 7.6 and using
> > > > the kernel cephfs mount). I hope there is enough logging from before
> > > > to try to track this issue down.
> > > >
> > > > We are back up and running for the moment.
> > > > --
> > > > Adam
> > > >
> > > >
> > > >
> > > > On Sat, Jan 12, 2019 at 11:23 AM Adam Tygart <mozes@xxxxxxx> wrote:
> > > > >
> > > > > Hello all,
> > > > >
> > > > > I've got a 31 machine Ceph cluster running ceph 12.2.10 and CentOS 7.6.
> > > > >
> > > > > We're using cephfs and rbd.
> > > > >
> > > > > Last night, one of our two active/active mds servers went laggy and
> > > > > upon restart once it goes active it immediately goes laggy again.
> > > > >
> > > > > I've got a log available here (debug_mds 20, debug_objecter 20):
> > > > > https://people.cs.ksu.edu/~mozes/ceph-mds-laggy-20190112.log.gz
> > > > >
> > > > > It looks like I might not have the right log levels. Thoughts on debugging this?
> > > > >
> > > > > --
> > > > > Adam
> > > > > _______________________________________________
> > > > > ceph-users mailing list
> > > > > ceph-users@xxxxxxxxxxxxxx
> > > > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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