Let's assume we have 3 geographically distributed data centers A,B,C. In each of these, a Cassandra cluster is up and running. Now assume DC A can no longer gossip with B and C.

Writes to A with `LOCAL_QUORUM`, would still be satisfied - *but they would no longer be propagated to B and C; and vice-versa.*

This situation could have some very disastrous consequences...

What I'm looking for are some tips on how to rapidly ascertain that DC A has become 'isolated' from the other data centers (using the Native Java driver).

I remember reading about push notifications, but I seem to recall they referred only to the status of the local cluster. Does anybody have any ideas? Thanks.