Read-Only Mode

                 Key: ZOOKEEPER-704
             Project: Zookeeper
          Issue Type: Wish
            Reporter: Henry Robinson

Read-only mode
Possible Mentor
Henry Robinson (henry at apache dot org)

Java and TCP/IP networking

When a ZooKeeper server loses contact with over half of the other servers in an 
ensemble ('loses a quorum'), it stops responding to client requests because it 
cannot guarantee that writes will get processed correctly. For some 
applications, it would be beneficial if a server still responded to read 
requests when the quorum is lost, but caused an error condition when a write 
request was attempted.

This project would implement a 'read-only' mode for ZooKeeper servers (maybe 
only for Observers) that allowed read requests to be served as long as the 
client can contact a server.

This is a great project for getting really hands-on with the internals of 
ZooKeeper - you must be comfortable with Java and networking otherwise you'll 
have a hard time coming up to speed.

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