Michi Mutsuzaki created ZOOKEEPER-2164:
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Summary: fast leader election keeps failing
Key: ZOOKEEPER-2164
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2164
Project: ZooKeeper
Issue Type: Bug
Components: leaderElection
Affects Versions: 3.4.5
Reporter: Michi Mutsuzaki
I have a 3-node cluster with sids 1, 2 and 3. Originally 2 is the leader. When
I shut down 2, 1 and 3 keep going back to leader election. Here is what seems
to be happening.
- Both 1 and 3 elect 3 as the leader.
- 1 receives votes from 3 and itself, and starts trying to connect to 3 as a
follower.
- 3 doesn't receive votes for 5 seconds because connectOne() to 2 doesn't
timeout for 5 seconds:
https://github.com/apache/zookeeper/blob/41c9fcb3ca09cd3d05e59fe47f08ecf0b85532c8/src/java/main/org/apache/zookeeper/server/quorum/QuorumCnxManager.java#L346
- By the time 3 receives votes, 1 has given up trying to connect to 3:
https://github.com/apache/zookeeper/blob/41c9fcb3ca09cd3d05e59fe47f08ecf0b85532c8/src/java/main/org/apache/zookeeper/server/quorum/Learner.java#L247
I'm using 3.4.5, but it looks like this part of the code hasn't changed for a
while, so I'm guessing later versions have the same issue.
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