# 【etcd】单 Raft 组与服务器角色：Leader、Follower、Learner 与 request 路由

DevFeed: [【etcd】单 Raft 组与服务器角色：Leader、Follower、Learner 与 request 路由](<https://devfeed.tech/articles/etcd-raft-leader-follower-learner-request-33984.md>)

Original publisher: [Read original article](<https://quant67.com/post/etcd/02-single-raft/02-single-raft.html>)

Author: Liao Tonglang

Published: 2026-08-26T00:00:00Z

Content type: article

Language: zh

Sources: [土法炼钢 - 系统与基础设施](<https://devfeed.tech/sources/source-4.md>)

Topics: [etcd](<https://devfeed.tech/topics/etcd.md>), [Raft](<https://devfeed.tech/topics/raft.md>), [gRPC](<https://devfeed.tech/topics/grpc.md>)

Tags: [apiserver](<https://devfeed.tech/tags/apiserver.md>), [apply](<https://devfeed.tech/tags/apply.md>), [atomic](<https://devfeed.tech/tags/atomic.md>), [commit](<https://devfeed.tech/tags/commit.md>), [compaction](<https://devfeed.tech/tags/compaction.md>), [distributed](<https://devfeed.tech/tags/distributed.md>), [etcd](<https://devfeed.tech/tags/etcd.md>), [etcdserver](<https://devfeed.tech/tags/etcdserver.md>), [follower](<https://devfeed.tech/tags/follower.md>), [kubernetes](<https://devfeed.tech/tags/kubernetes.md>), [leader](<https://devfeed.tech/tags/leader.md>), [learner](<https://devfeed.tech/tags/learner.md>), [linearizable](<https://devfeed.tech/tags/linearizable.md>), [raft](<https://devfeed.tech/tags/raft.md>), [request](<https://devfeed.tech/tags/request.md>), [single-raft-group](<https://devfeed.tech/tags/single-raft-group.md>), [v3](<https://devfeed.tech/tags/v3.md>), [v3-5](<https://devfeed.tech/tags/v3-5.md>), [v3-5-33](<https://devfeed.tech/tags/v3-5-33.md>), [wal](<https://devfeed.tech/tags/wal.md>), [watch](<https://devfeed.tech/tags/watch.md>)

## AI overview

This article explains how etcd v3.5.33 embeds a single Raft group, separates EtcdServer responsibilities from the Raft library, and routes requests across Leader, Follower, and Learner roles. It covers gRPC write forwarding, linearizable and serializable reads, and the handling of watch, lease, and mutating requests.

## Source excerpt

钉清 etcd v3.5.33 单 Raft 组拓扑、EtcdServer 与 go.etcd.io/raft/v3 边界、Leader/Follower/Learner 角色及 gRPC 写读路由；与 distributed/13 分工。