Like most folks, our WAN is composed of various zones, some central
processing, some edge, some corp, and some in between (DMZs). In this
model, a given Zookeeper server will not have direct connectivity to all
of it's peers in the ensemble due to various security constraints. Is
this a problem?
Each member needs a connection to a quorum. The quorum is ceiling((N+1) /
2) members of the cluster.
This guarantees that network partition does not allow two leaders to go on
stamping out revisions independent of each other.
On Fri, Jul 24, 2009 at 4:23 PM, Todd Greenwood
Servers in a quorum need to be able to talk to each other to elect a
leader. Once a leader is elected, followers only talk to the leader.
Of course, if the leader fails, servers in some quorum will need to
talk to each other again. If no quorum can be formed, the system is
stalled.
Flavio Ted, thank you for your comments.
So it sounds like the only way to currently deploy to the WAN is to
deploy ZK Servers to the central DC and open up client connections to
these ZK servers from the edge nodes. True?
In the future, once the Observers feature is implemented, then we should
