Optimizations for WAN Deployments

                 Key: ZOOKEEPER-699
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-699
             Project: Zookeeper
          Issue Type: Wish
            Reporter: Henry Robinson

Optimizations for WAN Deployments

Possible Mentor
Henry Robinson (henry at apache dot org)

Java, some networking familiarity

ZK 3.3.0 added observers which are non-voting members of a ZK ensemble. One use 
case for observers is as a proxy to a remote voting ensemble, say in a 
different data center. Since observers do not need to vote, there are less 
strict latency requirements on the delivery of messages to them. WAN traffic is 
also expensive. This project would investigate and implement batching of 
messages to observers, and potential mechanisms for decreasing the number of 
messages that need to be sent. For example, a destructive update to a znode 
twice in a row does not theoretically need to be sent twice - although making 
this work correctly with ZAB will be a challenge.

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