On Fri, Mar 11, 2016 at 05:26:06PM +0100, Ivan Kelly wrote: > On Fri, Mar 11, 2016 at 5:20 PM, Ben Pfaff <b...@ovn.org> wrote: > > On Fri, Mar 11, 2016 at 05:10:15PM +0100, Ivan Kelly wrote: > >> > Just to make sure, does this means that a Zookeeper client cannot read a > >> > consistent snapshot of the entire database? > >> Yes, exactly. It can only read one node at a time, so writes can occur > >> between the reading of two nodes. > > > > OK. That's a major downside for this use case, because the OVN clients > > are accustomed to viewing a consistent snapshot of the database. > Well, if you do the log tailing thing I suggested, then the client > will have access to a consistent snapshot, since they would only read > from the database directly once, and all client updates after that > would come from the log which arrive in a well defined order.
OK. I'm concerned about the log tailing solution, because it seems likely to me that each hypervisor would have to examine every transaction, not just those related to the logical switches that they're interested in. This could become a scale issue. _______________________________________________ dev mailing list dev@openvswitch.org http://openvswitch.org/mailman/listinfo/dev
