The mongodb driver is the only one in Havana that is feature complete. In particular, the metaquery feature (i.e. the ability to compose queries constrained on sample metadata) was not supported by the sqlalchemy driver in Havana. We plan to bring the sqlalchemy driver up to feature parity though during Icehouse. Cheers, Eoghan ----- Original Message ----- > Hi, > > Is there a preference why mongo is preferred than mysql for the ceilometer > production deployments ? > > In the Ceilometer Havana documentation, there was some reference to > "metadata" support available only in mongo. Can someone provide some insight > on this ? > > > Thanks, > Prashanth > > _______________________________________________ > Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack > Post to : openstack at lists.openstack.org > Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack >