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https://issues.apache.org/jira/browse/ZOOKEEPER-2164?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17033618#comment-17033618
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Mate Szalay-Beko commented on ZOOKEEPER-2164:
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Thanks [~suhas.dantkale], this is a nice catch / proposal indeed.
In our production environments we don't use 0.0.0.0 in any zoo.cfg files, but I
can imagine that it makes sense in some scenarios. Although since
ZOOKEEPER-3188 you can explicitly specify multiple addresses for the
server-server communication. And I think there is already a config property
(clientPortAddress) to set the host address where the clientPort will bind in
the server. I guess people want to set that to 0.0.0.0 in some setups. (see
[https://zookeeper.apache.org/doc/r3.5.6/zookeeperAdmin.html])
BTW, I don't think it is related to the issue we discussed in this Jira. at
least in my tests I got the error without using 0.0.0.0 anywhere.
> 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
> Assignee: Mate Szalay-Beko
> Priority: Major
> Fix For: 3.7.0, 3.5.8
>
>
> 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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