Leader election selected incorrect leader

                 Key: ZOOKEEPER-917
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-917
             Project: Zookeeper
          Issue Type: Bug
          Components: leaderElection, server
    Affects Versions: 3.2.2
         Environment: Cloudera distribution of zookeeper (patched to never 
cache DNS entries)
Debian lenny
            Reporter: Alexandre Hardy
            Priority: Critical

We had three nodes running zookeeper:
  * failed, and was replaced by a new node (automated 
startup). The new node had not participated in any zookeeper quorum previously. 
The node was permanently removed from service and could not 
contribute to the quorum any further (powered off).

DNS entries were updated for the new node to allow all the zookeeper servers to 
find the new node.

The new node was selected as the LEADER, despite the fact that 
it had not seen the latest zxid.

This particular problem has not been verified with later versions of zookeeper, 
and no attempt has been made to reproduce this problem as yet.

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