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https://issues.apache.org/jira/browse/ZOOKEEPER-1732?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13808194#comment-13808194
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Raul Gutierrez Segales commented on ZOOKEEPER-1732:
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Hmm, I still think this could confuse people rolling a cluster. Sounds like we
should revert this for the next release unless we have a fix for it. Smooth
upgrades through rolling restarts are an expectation that ZooKeeper has always
maintained.
> 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
> Assignee: Germán Blanco
> Priority: Blocker
> Fix For: 3.4.6, 3.5.0
>
> Attachments: CREATE_INCONSISTENCIES_patch.txt, zklog.tar.gz,
> ZOOKEEPER-1732-3.4.patch, ZOOKEEPER-1732-3.4.patch, ZOOKEEPER-1732-3.4.patch,
> ZOOKEEPER-1732-3.4.patch, ZOOKEEPER-1732-b3.4.patch,
> ZOOKEEPER-1732-b3.4.patch, ZOOKEEPER-1732.patch, ZOOKEEPER-1732.patch,
> ZOOKEEPER-1732.patch, ZOOKEEPER-1732.patch, ZOOKEEPER-1732.patch
>
>
> 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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