Hi
I'm a recent user of zookeeper (awesome work btw) and although I've
(most of) the wiki and already have some running code I still have some
questions.
1- Feasibility of a two node cluster:
Q- I know zookeeper runs over (a approx. version of) paxos and
tolerates f failures in 2f+1 nodes but would it be possible to use in a 2
server + 1 quorum disk deployment (much like windows clusters do)? The
objective would be to use ZK both for distributed (processing nodes >2) and
single processing node (2 nodes active-passive) highly available deployments.
2- Meta-ZK cluster group membership/management.
Zk already provides a group membership construct by allowing to
register/unregister ephemeral nodes and by deleting them on failed sessions,
but would it be possible to do so for the actual zookeeper ensemble? For
instance I'd like to make nodes add themselves to the ZK ensemble based on its
size (for instance keep adding nodes based if ensemble size < 5) and if a node
that is part of the ensemble fails then a new node would take its place. Is
this possible?
Regards
David
