Leader can treat observers as quorum members
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Key: ZOOKEEPER-769
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-769
Project: Zookeeper
Issue Type: Bug
Affects Versions: 3.3.0
Environment: Ubuntu Karmic x64
Reporter: Sergey Doroshenko
Fix For: 3.3.0
In short: it seems leader can treat observers as quorum members.
Steps to repro:
1. Server configuration: 3 voters, 2 observers (attached).
2. Bring up 2 voters and one observer. It's enough for quorum.
3. Shut down the one from the quorum who is the follower.
As I understand, expected result is that leader will start a new election round
so that to regain quorum.
But the real situation is that it just says goodbye to that follower, and is
still operable. (When I'm shutting down 3rd one -- observer -- leader starts
trying to regain a quorum).
(Expectedly, if on step 3 we shut down the leader, not the follower, remaining
follower starta new leader election, as it should be).
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