I hava the same setup & got the same problem like Sergey. Not yet figured out a good solution for this (except Pacemaker/Corosync)
On Thu, May 15, 2014 at 1:49 AM, Сергей Мотовиловец < motovilovets.ser...@gmail.com> wrote: > Hello everyone! > > I'm facing some troubles with nova and cinder here. > > I have 2 control nodes (active/active) in my testing environment with > Percona XtraDB cluster (Galera+xtrabackup) + garbd on a separate node (to > avoid split-brain) + OpenStack Icehouse, latest from Ubuntu 14.04 main > repo. > > The problem is horizontal scalability of nova-conductor and > cinder-scheduler services, seems like all active instances of these > services are trying to execute same MySQL queries they get from Rabbit, > which leads to numerous deadlocks in set-up with Galera. > > In case when multiple nova-conductor services are running (and using MySQL > instances on corresponding control nodes) it appears as "Deadlock found > when trying to get lock; try restarting transaction" in log. > With cinder-scheduler it leads to "InvalidBDM: Block Device Mapping is > Invalid." > > Is there any possible way to make multiple instances of these services > running simultaneously and not duplicating queries? > (I don't really like the idea of handling this with Heartbeat+Pacemaker or > other similar stuff, mostly because I'm thinking about equal load > distribution across control nodes, but in this case it seems like it has an > opposite effect, multiplying load on MySQL) > > Another thing that is extremely annoying: if instance stuck in ERROR state > because of deadlock during its termination - it is impossible to terminate > instance anymore in Horizon, only via nova-api with reset-state. How can > this be handled? > > I'd really appreciate any help/advises/thoughts regarding these problems. > > > Best regards, > Motovilovets Sergey > Software Operation Engineer > > _______________________________________________ > Mailing list: > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack > Post to : openstack@lists.openstack.org > Unsubscribe : > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack > >
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