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https://issues.apache.org/jira/browse/ZOOKEEPER-2164?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16940855#comment-16940855
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Michael Dürr commented on ZOOKEEPER-2164:
-----------------------------------------
Same problem here:
* Simple 3 node cluster (zoo1, zoo2, zoo3). zoo1 is leader
* Shutting down and restarting zoo1 will not result in a proper cluster state:
{code:bash}
$ echo "stat" | nc zoo1 2181
This ZooKeeper instance is not currently serving requests
{code}
{code:bash}
$ echo "stat" | nc zoo2 2181
Zookeeper version: 3.5.5-390fe37ea45dee01bf87dc1c042b5e3dcce88653, built on
05/03/2019 12:07 GMT
Clients:
/172.22.0.1:45764[0](queued=0,recved=1,sent=0)
Latency min/avg/max: 0/0/0
Received: 3
Sent: 2
Connections: 1
Outstanding: 0
Zxid: 0x1000000009
Mode: follower
Node count: 401
{code}
{code:bash}
$ echo "stat" | nc zoo3 2181
Zookeeper version: 3.5.5-390fe37ea45dee01bf87dc1c042b5e3dcce88653, built on
05/03/2019 12:07 GMT
Clients:
/172.22.0.1:53132[0](queued=0,recved=1,sent=0)
Latency min/avg/max: 0/0/0
Received: 2
Sent: 1
Connections: 1
Outstanding: 0
Zxid: 0x1400000000
Mode: leader
Node count: 401
Proposal sizes last/min/max: -1/-1/-1
{code}
> 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
> Priority: Major
> Fix For: 3.6.0, 3.5.7
>
>
> 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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