On 20 Jun 2014, at 2:14 pm, Patrick Hemmer <pacema...@feystorm.net> wrote:
> After the demise of the old heartbeat service, and the switch to corosync as > the primary (sole) method of communication between nodes, heartbeat is still supported as a messaging/membership layer > has there ever been any consideration into using services such as etcd, > consul, zookeeper, or doozerd? I think most of these didn't exist at the time. Do any provide membership too? What about message ordering? > > These alternative communication engines offer some stuff that corosync > doesn't. One such item etcd & consul offer is dynamic cluster scaling > capabilities (nodes can very easily join and leave the cluster). When working > in cloud computing, this feature becomes very important. Pcs is somewhat > helpful in this regard but it's still nowhere near as capable (plus corosync > doesn't have downscaling finished). > However one critical difference between these services and corosync is that > they are mainly key/value stores, and don't have something like Corosync's > CPG. Yes, a rather critical difference. > Though you could probably implement something looking like CPG using a > keyvalue store, I rather doubt it. k/v stores and CPG are not very alike from where I'm sitting. > I think pacemaker might be able to use a key/value store natively. > > So, has this ever been considered? How heavily tied is pacemaker to the > corosync API? Could that be abstracted out enough to where different > communication engines could be implemented? It's already abstracted to the point where it supports 4 different messaging/membership options: - heartbeat - corosync/pacemaker plugin - cman - corosync 2 > > > -Patrick > _______________________________________________ > Pacemaker mailing list: Pacemaker@oss.clusterlabs.org > http://oss.clusterlabs.org/mailman/listinfo/pacemaker > > Project Home: http://www.clusterlabs.org > Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf > Bugs: http://bugs.clusterlabs.org
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