Redis 分布式锁进阶第七十二篇

承接上一篇锁超时、主从丢锁、集群脑裂三大生产问题，本篇聚焦 Redisson 中三类高频进阶锁：公平锁、异步锁、读写锁。分别讲解设计原理、适用场景、底层逻辑、核心代码与线上使用规范，区分不同业务场景该如何选型，同时对比普通非公平锁的差异，补齐分布式锁完整知识体系。

一、开篇导读

前面篇章讲解的均为 Redisson 默认非公平可重入锁，线程抢锁全凭竞争，不区分等待顺序。在实际业务中，会遇到排队有序执行、异步无阻塞加锁、读写分离并发控权等场景，普通锁无法满足诉求。 本篇依次拆解三大进阶锁：公平锁解决排队顺序问题、异步锁适配非阻塞编程模型、读写锁区分读 / 写并发权限，同时附带 Lua 核心逻辑、调用示例、优缺点与落地禁忌。

二、Redisson 公平锁（FairLock）

2.1 适用场景

非公平锁下，新线程可能直接插队抢到锁，长期等待的线程会出现线程饥饿。 公平锁严格按照请求加锁的先后顺序分配锁资源，保证先来先执行。 典型场景：消息队列消费、任务排队执行、顺序化业务流程、需要严格保证请求时序的接口。

2.2 底层数据结构与核心原理

公平锁在普通 Hash 锁基础上，额外借助List 队列 + 发布订阅实现排队机制：

1. 基础锁结构：依旧使用 Hash 存储线程标识与重入次数，保留可重入特性；
2. 排队队列：单独维护一个 List 结构，记录所有等待锁的线程标识，按照入队顺序排序；
3. 竞争规则：锁释放后，从队列头部取出第一个等待线程分配锁，杜绝插队；
4. 唤醒机制：结合发布订阅，锁释放后依次唤醒队列内线程，有序竞争。

2.3 核心运行流程

1. 线程尝试加锁，若锁空闲，直接获取锁执行业务；
2. 锁被占用时，将当前线程信息存入等待队列，订阅消息并阻塞；
3. 锁持有者解锁后，向频道发送释放通知，同时从队列头部取出首个等待线程；
4. 被唤醒线程获取锁，其余线程继续排队，全程遵循先来先服务。

2.4 基础使用示例（Java）

java

运行

2.5 优缺点与选型建议

• 优点：保证执行顺序，彻底解决线程饥饿，时序严格可控；
• 缺点：多了队列维护、顺序唤醒逻辑，性能略低于非公平锁，高并发下吞吐略有下降；
• 建议：顺序类业务必用公平锁，高并发抢资源、无顺序要求场景优先默认非公平锁。

三、Redisson 异步锁（AsyncLock）

3.1 适用场景

传统lock()是同步阻塞模式，线程会一直卡在加锁环节，直到获取锁成功。 异步锁基于 Reactor 异步模型，适配响应式编程、Netty 服务、网关、微服务异步链路，全程不阻塞工作线程，提升线程复用率与系统吞吐。 典型场景：网关接口、异步回调服务、高吞吐中间件、全异步架构项目。

3.2 核心设计特点

1. 不阻塞当前工作线程，加锁结果通过回调、CompletableFuture异步返回；
2. 底层依然复用原有 Lua 脚本、看门狗续期、发布订阅能力，功能与同步锁完全对齐；
3. 支持可重入、超时等待、自动续期、失败重试等全部特性；
4. 严格遵循异步编程范式，避免阻塞线程池造成服务卡死。

3.3 常用 API 与代码示例

3.3.1 异步加锁（无阻塞）

https://www.hongxiu.com/booklist/1511172
https://www.hongxiu.com/booklist/1510655
https://www.hongxiu.com/booklist/1511188
https://www.hongxiu.com/booklist/1510669
https://www.hongxiu.com/booklist/1511198
https://www.hongxiu.com/booklist/1511003
https://www.hongxiu.com/booklist/1510881
https://www.hongxiu.com/booklist/1511002
https://www.hongxiu.com/booklist/1510975
https://www.hongxiu.com/booklist/1510980
https://www.hongxiu.com/booklist/1511339
https://www.hongxiu.com/booklist/1511063
https://www.hongxiu.com/booklist/1510994
https://www.hongxiu.com/booklist/1511182
https://www.hongxiu.com/booklist/1511213
https://www.hongxiu.com/booklist/1510808
https://www.hongxiu.com/booklist/1511208
https://www.hongxiu.com/booklist/1511008
https://www.hongxiu.com/booklist/1511320
https://www.hongxiu.com/booklist/1510752
https://www.hongxiu.com/booklist/1510796
https://www.hongxiu.com/booklist/1510649
https://www.hongxiu.com/booklist/1511104
https://www.hongxiu.com/booklist/1510767
https://www.hongxiu.com/booklist/1510979
https://www.hongxiu.com/booklist/1511279
https://www.hongxiu.com/booklist/1510697
https://www.hongxiu.com/booklist/1510828
https://www.hongxiu.com/booklist/1511240
https://www.hongxiu.com/booklist/1511278
https://www.hongxiu.com/booklist/1511254
https://www.hongxiu.com/booklist/1511300
https://www.hongxiu.com/booklist/1511275
https://www.hongxiu.com/booklist/1510778
https://www.hongxiu.com/booklist/1510657
https://www.hongxiu.com/booklist/1510835
https://www.hongxiu.com/booklist/1511118
https://www.hongxiu.com/booklist/1510698
https://www.hongxiu.com/booklist/1511081
https://www.hongxiu.com/booklist/1511122
https://www.hongxiu.com/booklist/1511093
https://www.hongxiu.com/booklist/1510963
https://www.hongxiu.com/booklist/1511084
https://www.hongxiu.com/booklist/1510700
https://www.hongxiu.com/booklist/1511112
https://www.hongxiu.com/booklist/1510925
https://www.hongxiu.com/booklist/1511340
https://www.hongxiu.com/booklist/1510771
https://www.hongxiu.com/booklist/1510732
https://www.hongxiu.com/booklist/1510678
https://www.hongxiu.com/booklist/1510827
https://www.hongxiu.com/booklist/1510672
https://www.hongxiu.com/booklist/1511015
https://www.hongxiu.com/booklist/1511000
https://www.hongxiu.com/booklist/1511023
https://www.hongxiu.com/booklist/1510660
https://www.hongxiu.com/booklist/1510783
https://www.hongxiu.com/booklist/1511351
https://www.hongxiu.com/booklist/1510671
https://www.hongxiu.com/booklist/1510780
https://www.hongxiu.com/booklist/1510988
https://www.hongxiu.com/booklist/1510976
https://www.hongxiu.com/booklist/1511277
https://www.hongxiu.com/booklist/1510680
https://www.hongxiu.com/booklist/1511006
https://www.hongxiu.com/booklist/1510879
https://www.hongxiu.com/booklist/1511191
https://www.hongxiu.com/booklist/1511263
https://www.hongxiu.com/booklist/1511256
https://www.hongxiu.com/booklist/1511134
https://www.hongxiu.com/booklist/1511207
https://www.hongxiu.com/booklist/1510882
https://www.hongxiu.com/booklist/1511007
https://www.hongxiu.com/booklist/1511236
https://www.hongxiu.com/booklist/1511095
https://www.hongxiu.com/booklist/1511111
https://www.hongxiu.com/booklist/1511097
https://www.hongxiu.com/booklist/1510985
https://www.hongxiu.com/booklist/1510890
https://www.hongxiu.com/booklist/1510887
https://www.hongxiu.com/booklist/1510995
https://www.hongxiu.com/booklist/1510733
https://www.hongxiu.com/booklist/1511096
https://www.hongxiu.com/booklist/1510789
https://www.hongxiu.com/booklist/1511204
https://www.hongxiu.com/booklist/1510806
https://www.hongxiu.com/booklist/1510990
https://www.hongxiu.com/booklist/1511203
https://www.hongxiu.com/booklist/1510729
https://www.hongxiu.com/booklist/1511196
https://www.hongxiu.com/booklist/1510784
https://www.hongxiu.com/booklist/1510984
https://www.hongxiu.com/booklist/1511083
https://www.hongxiu.com/booklist/1510886
https://www.hongxiu.com/booklist/1511185
https://www.hongxiu.com/booklist/1511238
https://www.hongxiu.com/booklist/1510694
https://www.hongxiu.com/booklist/1511103
https://www.hongxiu.com/booklist/1510870
https://www.hongxiu.com/booklist/1511117
https://www.hongxiu.com/booklist/1510899
https://www.hongxiu.com/booklist/1510898
https://www.hongxiu.com/booklist/1511109
https://www.hongxiu.com/booklist/1511189
https://www.hongxiu.com/booklist/1511190
https://www.hongxiu.com/booklist/1511041
https://www.hongxiu.com/booklist/1511202
https://www.hongxiu.com/booklist/1511115
https://www.hongxiu.com/booklist/1511319
https://www.hongxiu.com/booklist/1510965
https://www.hongxiu.com/booklist/1510992
https://www.hongxiu.com/booklist/1510989
https://www.hongxiu.com/booklist/1510797
https://www.hongxiu.com/booklist/1511022
https://www.hongxiu.com/booklist/1510687
https://www.hongxiu.com/booklist/1511173
https://www.hongxiu.com/booklist/1511187
https://www.hongxiu.com/booklist/1511152
https://www.hongxiu.com/booklist/1510794
https://www.hongxiu.com/booklist/1510635
https://www.hongxiu.com/booklist/1510677
https://www.hongxiu.com/booklist/1510768
https://www.hongxiu.com/booklist/1510868
https://www.hongxiu.com/booklist/1510981
https://www.hongxiu.com/booklist/1510872
https://www.hongxiu.com/booklist/1510644
https://www.hongxiu.com/booklist/1511080
https://www.hongxiu.com/booklist/1511206
https://www.hongxiu.com/booklist/1510871
https://www.hongxiu.com/booklist/1510906
https://www.hongxiu.com/booklist/1511266
https://www.hongxiu.com/booklist/1510781
https://www.hongxiu.com/booklist/1510681
https://www.hongxiu.com/booklist/1511016
https://www.hongxiu.com/booklist/1511169
https://www.hongxiu.com/booklist/1510648
https://www.hongxiu.com/booklist/1510777
https://www.hongxiu.com/booklist/1510656
https://www.hongxiu.com/booklist/1510782
https://www.hongxiu.com/booklist/1511129
https://www.hongxiu.com/booklist/1510900
https://www.hongxiu.com/booklist/1510696
https://www.hongxiu.com/booklist/1510833
https://www.hongxiu.com/booklist/1510983
https://www.hongxiu.com/booklist/1510798
https://www.hongxiu.com/booklist/1511146
https://www.hongxiu.com/booklist/1510993
https://www.hongxiu.com/booklist/1511354
https://www.hongxiu.com/booklist/1510651
https://www.hongxiu.com/booklist/1510668
https://www.hongxiu.com/booklist/1510834
https://www.hongxiu.com/booklist/1510750
https://www.hongxiu.com/booklist/1511211
https://www.hongxiu.com/booklist/1510689
https://www.hongxiu.com/booklist/1510927
https://www.hongxiu.com/booklist/1511258
https://www.hongxiu.com/booklist/1511005
https://www.hongxiu.com/booklist/1511200
https://www.hongxiu.com/booklist/1510653
https://www.hongxiu.com/booklist/1511267
https://www.hongxiu.com/booklist/1510730
https://www.hongxiu.com/booklist/1510791
https://www.hongxiu.com/booklist/1510686
https://www.hongxiu.com/booklist/1510699
https://www.hongxiu.com/booklist/1510903
https://www.hongxiu.com/booklist/1510998
https://www.hongxiu.com/booklist/1511210
https://www.hongxiu.com/booklist/1510946
https://www.hongxiu.com/booklist/1510712
https://www.hongxiu.com/booklist/1511272
https://www.hongxiu.com/booklist/1510731
https://www.hongxiu.com/booklist/1511265
https://www.hongxiu.com/booklist/1511001
https://www.hongxiu.com/booklist/1510790
https://www.hongxiu.com/booklist/1511065
https://www.hongxiu.com/booklist/1511341
https://www.hongxiu.com/booklist/1510877
https://www.hongxiu.com/booklist/1510713
https://www.hongxiu.com/booklist/1511239
https://www.hongxiu.com/booklist/1510647
https://www.hongxiu.com/booklist/1510929
https://www.hongxiu.com/booklist/1510894
https://www.hongxiu.com/booklist/1511038
https://www.hongxiu.com/booklist/1510688
https://www.hongxiu.com/booklist/1511014
https://www.hongxiu.com/booklist/1511195
https://www.hongxiu.com/booklist/1511123
https://www.hongxiu.com/booklist/1510701
https://www.hongxiu.com/booklist/1511301
https://www.hongxiu.com/booklist/1511021
https://www.hongxiu.com/booklist/1510950
https://www.hongxiu.com/booklist/1510770
https://www.hongxiu.com/booklist/1510867
https://www.hongxiu.com/booklist/1511124
https://www.hongxiu.com/booklist/1510852
https://www.hongxiu.com/booklist/1511194
https://www.hongxiu.com/booklist/1511102
https://www.hongxiu.com/booklist/1511197
https://www.hongxiu.com/booklist/1511020
https://www.hongxiu.com/booklist/1510714
https://www.hongxiu.com/booklist/1510996
https://www.hongxiu.com/booklist/1510634
https://www.hongxiu.com/booklist/1510878
https://www.hongxiu.com/booklist/1510948
https://www.hongxiu.com/booklist/1511201
https://www.hongxiu.com/booklist/1511199
https://www.hongxiu.com/booklist/1510968
https://www.hongxiu.com/booklist/1511209
https://www.hongxiu.com/booklist/1511192
https://www.hongxiu.com/booklist/1511042
https://www.hongxiu.com/booklist/1510928
https://www.hongxiu.com/booklist/1510810
https://www.hongxiu.com/booklist/1511092
https://www.hongxiu.com/booklist/1510646
https://www.hongxiu.com/booklist/1510999
https://www.hongxiu.com/booklist/1510853
https://www.hongxiu.com/booklist/1510787
https://www.hongxiu.com/booklist/1510884
https://www.hongxiu.com/booklist/1510888
https://www.hongxiu.com/booklist/1510711
https://www.hongxiu.com/booklist/1511062
https://www.hongxiu.com/booklist/1511100
https://www.hongxiu.com/booklist/1511110
https://www.hongxiu.com/booklist/1510885
https://www.hongxiu.com/booklist/1511009
https://www.hongxiu.com/booklist/1510642
https://www.hongxiu.com/booklist/1510897
https://www.hongxiu.com/booklist/1511061
https://www.hongxiu.com/booklist/1511019
https://www.hongxiu.com/booklist/1511017
https://www.hongxiu.com/booklist/1511101
https://www.hongxiu.com/booklist/1510659
https://www.hongxiu.com/booklist/1510895
https://www.hongxiu.com/booklist/1510997
https://www.hongxiu.com/booklist/1510966
https://www.hongxiu.com/booklist/1510904
https://www.hongxiu.com/booklist/1510641
https://www.hongxiu.com/booklist/1511281
https://www.hongxiu.com/booklist/1510652
https://www.hongxiu.com/booklist/1511108
https://www.hongxiu.com/booklist/1510795
https://www.hongxiu.com/booklist/1511205
https://www.hongxiu.com/booklist/1510690
https://www.hongxiu.com/booklist/1511280
https://www.hongxiu.com/booklist/1511264
https://www.hongxiu.com/booklist/1511212
https://www.hongxiu.com/booklist/1511186
https://www.hongxiu.com/booklist/1510905
https://www.hongxiu.com/booklist/1511011
https://www.hongxiu.com/booklist/1510893
https://www.hongxiu.com/booklist/1510769
https://www.hongxiu.com/booklist/1511321
https://www.hongxiu.com/booklist/1511253
https://www.hongxiu.com/booklist/1511237
https://www.hongxiu.com/booklist/1510949
https://www.hongxiu.com/booklist/1511155
https://www.hongxiu.com/booklist/1511153
https://www.hongxiu.com/booklist/1510654
https://www.hongxiu.com/booklist/1511004
https://www.hongxiu.com/booklist/1510676
https://www.hongxiu.com/booklist/1511318
https://www.hongxiu.com/booklist/1511082
https://www.hongxiu.com/booklist/1510978
https://www.hongxiu.com/booklist/1511127
https://www.hongxiu.com/booklist/1511064
https://www.hongxiu.com/booklist/1511119
https://www.hongxiu.com/booklist/1510848
https://www.hongxiu.com/booklist/1511171
https://www.hongxiu.com/booklist/1510883
https://www.hongxiu.com/booklist/1510785
https://www.hongxiu.com/booklist/1510695
https://www.hongxiu.com/booklist/1510809
https://www.hongxiu.com/booklist/1510889
https://www.hongxiu.com/booklist/1511010
https://www.hongxiu.com/booklist/1511105
https://www.hongxiu.com/booklist/1511184
https://www.hongxiu.com/booklist/1511099
https://www.hongxiu.com/booklist/1510670
https://www.hongxiu.com/booklist/1510880
https://www.hongxiu.com/booklist/1510855
https://www.hongxiu.com/booklist/1510807
https://www.hongxiu.com/booklist/1511350
https://www.hongxiu.com/booklist/1511121
https://www.hongxiu.com/booklist/1510779
https://www.hongxiu.com/booklist/1510650
https://www.hongxiu.com/booklist/1510788
https://www.hongxiu.com/booklist/1510902
https://www.hongxiu.com/booklist/1511039
https://www.hongxiu.com/booklist/1511040
https://www.hongxiu.com/booklist/1511257
https://www.hongxiu.com/booklist/1511193
https://www.hongxiu.com/booklist/1511273
https://www.hongxiu.com/booklist/1510974
https://www.hongxiu.com/booklist/1511130
https://www.hongxiu.com/booklist/1510850
https://www.hongxiu.com/booklist/1510751
https://www.hongxiu.com/booklist/1511274
https://www.hongxiu.com/booklist/1511299
https://www.hongxiu.com/booklist/1510640
https://www.hongxiu.com/booklist/1511098