[jira] Commented: (ZOOKEEPER-107) Allow dynamic changes to server cluster membership

["Benjamin Reed (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12728300#action_12728300 ] 

Benjamin Reed commented on ZOOKEEPER-107:
-----------------------------------------

sorry to jump in late here. rather than adding the inform, why don't we just send the PROPOSE and COMMIT to the Observer as normal, and just make the Observer not send ACKs? That way we change as little code as possible with minimum overhead. It also makes switching from Observer to Follower as easy as turning on the ACKs. I also think Observers should be able to issue proposals. One use case for observers are remote data centers that basically proxy clients that connect to ZooKeeper. This means an Observer is just a Follower that doesn't vote (ACK).

> Allow dynamic changes to server cluster membership
> --------------------------------------------------
>
>                 Key: ZOOKEEPER-107
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-107
>             Project: Zookeeper
>          Issue Type: Improvement
>          Components: server
>            Reporter: Patrick Hunt
>            Assignee: Henry Robinson
>         Attachments: SimpleAddition.rtf
>
>
> Currently cluster membership is statically defined, adding/removing hosts to/from the server cluster dynamically needs to be supported.

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