分布式一致性算法Raft论文（0）——简介

分布式一致性算法Raft论文（0）——简介

动画演示：

Raft Consensus Algorithm

论文：

https://raft.github.io/raft.pdf

https://pdos.csail.mit.edu/6.824/papers/raft-extended.pdf    Extended Version

Abstract

Raft is a consensus algorithm for managing a replicated
log. It produces a result equivalent to (multi-)Paxos, and
it is as efficient as Paxos, but its structure is different
from Paxos;

Raft是一个管理复制副本的一致性算法。相当于是一个（Multi）Paxos的产物，并且和Paxos一样高效，但是结构和Paxos不同；

this makes Raft more understandable than Paxos and also provides a better foundation for building practical systems. In order to enhance understandability, Raft separates the key elements of consensus, such as leader election, log replication, and safety, and it enforces
a stronger degree of coherency to reduce the number of states that must be considered.

Raft比Paxos更易于理解，也可以更好的构建实用的系统。为了增强可理解性，Raft分离了“共识"的关键要素，如leader，选举，日志复制，安全性。加强了一致性，以减少需要考虑的state数量。

Results from a user study demonstrate that Raft is easier for students to learn than Paxos.

研究表名Raft比Paxos更容易学习。

Raft also includes a new mechanism for changing the cluster membership, which uses overlapping majorities to guarantee safety.

Raft 还包括一个用于变更集群成员的新机制，它使用重叠的大多数（overlapping majorities）来保证安全性。

复制状态机问题（第2节），

讨论了Paxos的优缺点（第3节），

描述了我们的可理解性一般方法（第4节），

介绍了Raft共识算法（第5-8节），

并对其进行了评估（第9节）

讨论相关工作（第10节）。