THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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- l The leader starts accepting connections from followers.
- f Followers connect the the leader and send SERVERINFO(lastZxid, info).
- l The leader sends SERVERINFO(lastZxid, info) to followers that connect.
- l The leader stops waits for a quorum of followers to connect all of whom has:
- f.currentEpoch <= l.currentEpoch
- if f.currentEpoch == l.currentEpoch, then f.lastZxid < l.lastZxid
- l Once the leader has quorum, it stops accepting connections, and sends NEWEPOCH(e) to all followers, where e is greater than all f.acceptedEpoch in the quorum.
- f Followers send ACK(e<<32) if e > f.acceptedEpoch. (If e < f.acceptedEpoch, the follower will abandon the leader. If e == f.acceptedEpoch, the follower will not send ACK(e<<32), but will still maintain the connection to the leader.)
- l The leader waits for all followers to ack NEWEPOCH(e)
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