Raft and ZAB

The Raft and ZAB agreements divide Multi Paxos into three sub-problems:

Leader Election

Log Replication

Safety

In the process of leader election, roles are also redefined:

Leader

Follower

Candidate

This animated website vividly shows the process of leader election and log copy. I won't talk about it here.

In addition, the official raft website can operate the mock election process by itself.