This is the problem. ALL writes go from the leader to all nodes and the transaction isn't done until a quorum of machines have confirmed the write. Unless you have a quorum in the central facility, then all writes be as slow as several round-trips to the peripheral installations. This slows down every transaction.
Observers might help because they are not considered to be part of the quorum. On Sun, Jul 26, 2009 at 11:05 AM, Todd Greenwood <to...@audiencescience.com>wrote: > > 4. A WAN topology of co-located ZK servers in both the DC and (n) PODs > would not significantly degrade the performance of the ensemble, provided > large blobs of traffic were not being sent across the network. -- Ted Dunning, CTO DeepDyve