[jira] Commented: (ZOOKEEPER-762) Allow dynamic addition/removal of server nodes in the client API

["Thomas Koch (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-762?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12916168#action_12916168 ] 

Thomas Koch commented on ZOOKEEPER-762:
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There are many changes in the java client on the horizont ( ZOOKEEPER-835 ) so if you implement this now, your patch will most likely not apply afterwards.



> 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
>         Attachments: 762.diff
>
>
> 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 logic.
> 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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