On Tue, Oct 25, 2011 at 11:35:47PM +0800, Yunkai Zhang wrote: > On Tue, Oct 25, 2011 at 11:14 PM, Steven Dake <sdake@xxxxxxxxxx> wrote: > > On 10/25/2011 08:11 AM, Yunkai Zhang wrote: > >> Hi Steven Dake: > >> > >> In our team, my coworkers and me are developing sheepdog which use CPG > >> service provided by corosync. > >> > >> We found that sheepdog will receive more than one confchg msg when > >> network partition occur. For example, suppose the cluster has 4 > >> nodes: N1, N2, N3, N4, and they form a single-ring initially. After a > >> while, network partition occur, the single-ring divide into two > >> sub-ring: ring(N1, N2, N3) and ring(N4). The sheepdog in the ring(N4) > >> will receive the following confchg messages in turn: > >> Memb: N2,N3,N4 Left:N1, Joined:null > >> memb: N3,N4 Left:N1,N2 Joined:null > >> memb: N4 Left:N1,N2,N3 Joined:null > >> > > > > Assuming there are no messages sent by cpg between these leaving events, > > this looks like a bug if totem generates 1 configuration change on this > > partition. > > > > Yes, I can ensure that totem only generates 1 configuration change but > send three messages to client in this case:) > > > I've copied Angus since he wrote the latest incarnation of that code ;) It looks like the notifications could be merged together. We should raise a bug for it. -A > > > > Regards > > -steve > > > >> I have read the corosync's code, and found that corosync send these > >> confchg messages in function: downlist_master_choose_and_send (in the > >> for loop). > >> > >> Why we send so many confchg message to CPG client(here is sheepdog) ? > >> The fist two message will make client confusing and do more > >> meaningless work. > >> > >> Can we give the user a selection to enable/disable this downlist > >> messages? Sheepdog just want to receive the last msg in this case. > >> > >> Thank you! > > > > _______________________________________________ > > discuss mailing list > > discuss@xxxxxxxxxxxx > > http://lists.corosync.org/mailman/listinfo/discuss > > > > > > -- > Yunkai Zhang > Work at Taobao > _______________________________________________ > discuss mailing list > discuss@xxxxxxxxxxxx > http://lists.corosync.org/mailman/listinfo/discuss _______________________________________________ discuss mailing list discuss@xxxxxxxxxxxx http://lists.corosync.org/mailman/listinfo/discuss
