Henry Robinson commented on ZOOKEEPER-107:

As it turns out, I've pretty much implemented Observers in all but name already 
- they go through the same connection logic as normal followers, and therefore 
sync, but are disbarred from sending Leader.REQUEST packets to the leader. 
Similarly, when a leader is sending a proposal packet it only gets sent to 
those followers which are in the current view. Since the logic is very similar, 
and we will be able to distinguish observers from followers by whether they are 
members of the current view, I haven't duplicated code into Observer* classes.

I added this when finding that any new follower can join an existing ensemble 
and issue proposals to it, even if the static configuration of the ensemble 
does not contain it. This seemed to deadlock the ensemble pretty quickly :)

> 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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