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https://issues.apache.org/jira/browse/ZOOKEEPER-107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12720411#action_12720411
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Raghu S commented on ZOOKEEPER-107:
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Ben, I still believe the split brain won't occur:
A. After (2), A and C have config verion X + 1, B and D are at X
B. After A dies, a leader election is not possible without C. During LE, B and
D discover that C is at X + 1. This will force B and D to update their
configuration to X + 1 and restart the election. This is what I refer to when I
say "reconciling configuration divergence" in my write up. D now leaves the
cluster since it just learnt that it was deleted.
C. A new quorum is formed with B and C.
D. When A comes back, config version of A B and C are the same. A will simply
join the leader. If A were still at X, then it will first update it's
configuration to X + 1 when it starts an election and then restart the election.
> 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
> 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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