Henry Robinson updated ZOOKEEPER-699:

    Summary: GSoC 2010: Optimizations for WAN Deployments  (was: Optimizations 
for WAN Deployments)

> GSoC 2010: 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)
> 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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