Henry Robinson commented on ZOOKEEPER-549:

Mahadev - yes, the FOLLOWERINFO discussion really applies to the observer 
patch. I think that we should push that specific backwards compatibility 
discussion onto the observers jira. 

I believe backwards compatibility is completely preserved by this patch: there 
aren't any protocol changes. 

> Refactor Followers and related classes into a Peer->Follower hierarchy in 
> preparation for Observers
> ---------------------------------------------------------------------------------------------------
>                 Key: ZOOKEEPER-549
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-549
>             Project: Zookeeper
>          Issue Type: Improvement
>          Components: quorum, server
>    Affects Versions: 3.2.1
>            Reporter: Henry Robinson
>            Assignee: Henry Robinson
>             Fix For: 3.3.0
>         Attachments: ZOOKEEPER-549.patch, ZOOKEEPER-549.patch, 
> ZOOKEEPER-549.patch, ZOOKEEPER-549.patch
> For the Observers patch (ZOOKEEPER-368), a lot of functionality is shared 
> between Followers and Observers. To avoid copying code, it makes sense to 
> push the common code into a parent Peer class and specialise it for Followers 
> and Observers. At the same time, some of the lengthier methods in Follower 
> can be broken up to make the code more readable. 

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