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From "Dave Wright (JIRA)" <j...@apache.org>
Subject [jira] Created: (ZOOKEEPER-762) Allow dynamic addition/removal of server nodes in the client API
Date Mon, 03 May 2010 20:55:56 GMT
Allow dynamic addition/removal of server nodes in the client API

                 Key: ZOOKEEPER-762
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-762
             Project: Zookeeper
          Issue Type: Sub-task
          Components: c client, java client
            Reporter: Dave Wright
            Priority: Minor

Currently the list of zookeeper servers needs to be provided to the client APIs at construction
time, and cannot be changed without a complete shutdown/restart of the client API. However,
there are scenarios that require the server list to be updated, such as removal or addition
of a ZK cluster node, and it would be nice if the list could be updated via a simple API call.

The general approach (in the Java client) would be to "RemoveServer()/AddServer()" functions
for Zookeeper that calls down to ClientCnxn, where they are just maintained in a list. Of
course if
the server being removed is the one currently connected, we'd need to disconnect, but a simple
call to disconnect() seems like it would resolve that and trigger the automatic re-connection
An equivalent change could be made in the C code. 

This change would also make dynamic cluster membership in ZOOKEEPER-107 easier to implement.

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