woaishixiaoxiao opened a new pull request #398:
URL: https://github.com/apache/curator/pull/398
When I use the LeaderLatch to select leader, there is a double-leader
phenomenon.
The timeline is as follows：
1. The zk cluster switch leader node bescause of zxid overflow
2. A client(not leader befor zxid overflow) and B client(is leader before
zxid overflow) enter the suspend state, B client set its leader status to false
3. B client enter the reconnect state, call the reset function. Delete its
old path.
4. A client enter the reconnect state and receive preNodeDeleteEvent. Then
getChildren from zkServer. Find itself is the smallest number and set itself
as a leader.
5. B client create a new temporary node and then getChildren from zkServer.
Find itself not the node with the smallest serial number and listen to the
previous node delete event.
6. A client delete its old path.
7. B client receive the preNodeDeleteEvent. then getchildren from zkServer.
Find itself is the smallest sequence number and then set itself as a leader
8. A client create a new temporary node and then getChildren from
zkServer. Find itself not the node with the smallest serial number and listen
to the previous node delete event. but it doesn't set itself as a non-leader
state. because of the fourth step operation, A still is leader state now.
now A client and B client are the leader at the same time
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