Optimizations for WAN Deployments
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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)
Requirements
Java, some networking familiarity
Description
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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