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https://issues.apache.org/jira/browse/ZOOKEEPER-107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12722063#action_12722063
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Benjamin Reed commented on ZOOKEEPER-107:
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i think if we use the notion of observers it helps: an observer can sync with a 
leader, but it doesn't get to vote. i think this makes it easy because the 
leader can then determine that it can commit with both the active followers and 
active observers if needed: for example start with A, B, C and move to A, B, D, 
E, F. if A and C are active followers and E and F are observers then the leader 
will propose the new configuration.

> 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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