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? Are there special configurations for this model?

Given 3 Zones

A <--> B
         B <--> C

A cannot see C, and vice versa.
B can see A and C.

1. Will zookeeper servers function properly even if a given set of
servers can only see some of the servers in the ensemble? For example,
the shared config lists all zk servers in A, B, and C, but A can only
see B, C can only see B, and B can see both A and C.

2. Will zookeeper servers flood the log with error messages if only a
subset of the ensemble members are visible?

3. Will the zk ensemble function properly if the config used by each
server only lists the servers in the ensemble that are visible? Suppose
that A has a config that only list servers in A and B, C a config for C
and B, and B has a config that lists servers in A, B, and C. Is this the
recommended approach?

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