# 【etcd】Lease 与 KeepAlive：TTL、checkpoint 与 Leader 切换

DevFeed: [【etcd】Lease 与 KeepAlive：TTL、checkpoint 与 Leader 切换](<https://devfeed.tech/articles/etcd-lease-keepalive-ttl-checkpoint-leader-33992.md>)

Original publisher: [Read original article](<https://quant67.com/post/etcd/10-lease/10-lease.html>)

Author: Liao Tonglang

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

Content type: tutorial

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>), [Kubernetes](<https://devfeed.tech/topics/kubernetes.md>), [Remote Procedure Call (RPC)](<https://devfeed.tech/topics/rpc.md>)

Tags: [api](<https://devfeed.tech/tags/api.md>), [checkpoint](<https://devfeed.tech/tags/checkpoint.md>), [client](<https://devfeed.tech/tags/client.md>), [concurrency](<https://devfeed.tech/tags/concurrency.md>), [distributed](<https://devfeed.tech/tags/distributed.md>), [etcd](<https://devfeed.tech/tags/etcd.md>), [follower](<https://devfeed.tech/tags/follower.md>), [k8s](<https://devfeed.tech/tags/k8s.md>), [keepalive](<https://devfeed.tech/tags/keepalive.md>), [kubernetes](<https://devfeed.tech/tags/kubernetes.md>), [lease](<https://devfeed.tech/tags/lease.md>), [lessor](<https://devfeed.tech/tags/lessor.md>), [primary](<https://devfeed.tech/tags/primary.md>), [raft](<https://devfeed.tech/tags/raft.md>), [ttl](<https://devfeed.tech/tags/ttl.md>), [v3](<https://devfeed.tech/tags/v3.md>), [v3-5-33](<https://devfeed.tech/tags/v3-5-33.md>), [watch](<https://devfeed.tech/tags/watch.md>)

## AI overview

This article explains etcd v3.5.33 lease behavior, focusing on the lessor's primary, demote, and promote roles, the KeepAlive renewal path that normally bypasses Raft, lease checkpointing, and TTL changes during leader transitions. It also discusses implications for Kubernetes Node Leases and distributed locks.

## Source excerpt

钉 etcd v3.5.33 lessor 的 primary/demote/promote、KeepAlive 不经 Raft 的 Renew 路径、LeaseCheckpoint 与 Promote 时 TTL 展期，以及 Leader 切换对 Node Lease 的排障落格。