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https://issues.apache.org/jira/browse/ZOOKEEPER-1732?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13715077#comment-13715077
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Flavio Junqueira commented on ZOOKEEPER-1732:
---------------------------------------------

I'm not sure why you think it is better to touch the Zab protocol rather than 
simply stop following if the follower vote is outdated. It is the simplest 
thing we can do and it is correct. 

I don't think touching the Zab protocol is a good idea, so I still prefer 
option 1 above.
                
> 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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