Leader election selected incorrect leader
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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:
* 192.168.130.10
* 192.168.130.11
* 192.168.130.14
192.168.130.11 failed, and was replaced by a new node 192.168.130.13 (automated
startup). The new node had not participated in any zookeeper quorum previously.
The node 192.148.130.11 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 192.168.130.13 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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