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https://issues.apache.org/jira/browse/ZOOKEEPER-1732?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13715026#comment-13715026
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Germán Blanco commented on ZOOKEEPER-1732:
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I see, trying to make this a bit faster doesn't make sense at all.
Sorry, but I am confused about the epoch handling in the initial negotiation 
between the Follower and the Leader.
The current FOLLOWERINFO QuorumPacket seems to contain already the 
"acceptedEpoch", isn't it already possible for the Leader to check that value 
and reject the connection if it is wrong?
                
> ZooKeeper server unable to join established ensemble
> ----------------------------------------------------
>
>                 Key: ZOOKEEPER-1732
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1732
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: leaderElection
>    Affects Versions: 3.4.5
>         Environment: Windows 7, Java 1.7
>            Reporter: Germán Blanco
>            Priority: Blocker
>             Fix For: 3.5.0, 3.4.6
>
>         Attachments: zklog.tar.gz
>
>
> I have a test in which I do a rolling restart of three ZooKeeper servers and 
> it was failing from time to time.
> I ran the tests in a loop until the failure came out and it seems that at 
> some point one of the servers is unable to join the enssemble formed by the 
> other two.

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