Zookeeper Server cannot join an existing ensemble if the existing ensemble
doesn't already have a quorum
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Key: ZOOKEEPER-1075
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1075
Project: ZooKeeper
Issue Type: Bug
Components: leaderElection
Affects Versions: 3.3.2
Environment: Windows 7
Reporter: Vishal Kathuria
Here is the sequence of steps that reproduces the problem.
On a 3 server ensemble,
1. Bring up two servers (say 1 and 2). Lets say 1 is leading.
2. Bring down 2
3. Bring up 2.
4. 2 gets a notification from 1 that it is leading but 2 doesn't accept it as a
leader since it cannot find one other node that thinks 1 is the leader.
So the ensemble gets stuck where 2 isn't following. If at this point, 3 comes
up, then one of 2 & 3 will become a leader and 1 will keep thinking it is the
leader.
I am working on a patch to fix this issue.
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