做電商后端開發(fā)商品超賣應(yīng)該算是老生常談的并發(fā)難題了。之前我參與過一個(gè)秒殺小活動(dòng)庫存設(shè)置 100 件最后下單成功 130 多單直接出現(xiàn)超賣后續(xù)還要人工處理退款給業(yè)務(wù)造成不小麻煩。一開始我們用數(shù)據(jù)庫樂觀鎖去處理并發(fā)量不高的時(shí)候還好一旦請(qǐng)求量上來大量請(qǐng)求直接打在數(shù)據(jù)庫數(shù)據(jù)庫 CPU 飆升接口響應(yīng)直接超時(shí)。后來調(diào)研選型最終采用 Redisson 分布式鎖來解決該問題。今天結(jié)合線上踩過的坑把 Redisson 分布式鎖落地完整過程記錄下來。一、為什么不能直接用原生 Redis 實(shí)現(xiàn)分布式鎖很多同學(xué)剛開始會(huì)直接用SETNX手寫 Redis 鎖。寫起來看著簡單但是坑非常多。比如鎖超時(shí)、業(yè)務(wù)還沒執(zhí)行完鎖就釋放鎖被其他線程誤釋放主從切換鎖丟失等一堆問題。如果自己全部去處理這些邊界代碼會(huì)寫的非常復(fù)雜稍有遺漏就會(huì)出線上故障。而 Redisson 是 Redis 官方推薦的 Java 客戶端它把鎖續(xù)期、鎖可重入、鎖釋放、主從等各種復(fù)雜邏輯全部封裝好了我們直接調(diào)用 API 即可生產(chǎn)環(huán)境穩(wěn)定性要高很多。二、項(xiàng)目引入 Redisson 依賴SpringBoot 項(xiàng)目pom.xml 引入依賴注意版本要和你的 SpringBoot 版本兼容。dependency groupIdorg.redisson/groupId artifactIdredisson?spring?boot?starter/artifactId version3.23.5/version /dependencyapplication.yml 配置 Redis 連接信息spring: redis: host: 127.0.0.1 port: 6379 password: database: 0三、訂單扣庫存超賣錯(cuò)誤示例問題代碼先看一段有并發(fā)問題的代碼這也是很多新手容易寫出的業(yè)務(wù)邏輯。Service public class OrderServiceImpl implements OrderService { Autowired private GoodsMapper goodsMapper; Autowired private OrderMapper orderMapper; Override Transactional public void createOrder(Long goodsId) { //1.查詢庫存 Goods goods goodsMapper.selectById(goodsId); if(goods.getStock() 0){ throw new RuntimeException(商品庫存不足); } //2.扣減庫存 goods.setStock(goods.getStock() -1); goodsMapper.updateById(goods); //3.生成訂單 Order order new Order(); order.setGoodsId(goodsId); orderMapper.insert(order); } }問題高并發(fā)場景多個(gè)線程同時(shí)讀到同一個(gè)庫存數(shù)值全部通過庫存判斷就會(huì)產(chǎn)生超賣。單純數(shù)據(jù)庫事務(wù)解決不了這個(gè)問題事務(wù)只能保證原子性不能擋住并發(fā)讀取。四、Redisson 分布式鎖改造后的業(yè)務(wù)代碼這里使用 Redisson 可重入鎖RLock直接上鎖之后再執(zhí)行庫存判斷和下單邏輯。Service public class OrderServiceImpl implements OrderService { Autowired private GoodsMapper goodsMapper; Autowired private OrderMapper orderMapper; Autowired private RedissonClient redissonClient; Override Transactional public void createOrder(Long goodsId) { //定義鎖key同一個(gè)商品用同一個(gè)key String lockKey lock:goods: goodsId; RLock rLock redissonClient.getLock(lockKey); try { //嘗試獲取鎖等待3秒鎖自動(dòng)釋放時(shí)間30秒 boolean getLock rLock.tryLock(3,30, TimeUnit.SECONDS); if(!getLock){ throw new RuntimeException(請(qǐng)求繁忙請(qǐng)稍后重試); } //獲取鎖成功執(zhí)行業(yè)務(wù) Goods goods goodsMapper.selectById(goodsId); if(goods.getStock() 0){ throw new RuntimeException(商品庫存不足); } goods.setStock(goods.getStock() -1); goodsMapper.updateById(goods); Order order new Order(); order.setGoodsId(goodsId); orderMapper.insert(order); } catch (InterruptedException e) { Thread.currentThread().interrupt(); throw new RuntimeException(獲取鎖異常); } finally { //必須判斷當(dāng)前線程持有鎖才釋放防止誤釋放別人的鎖 if(rLock.isHeldByCurrentThread()){ rLock.unlock(); } } } }這里有個(gè)細(xì)節(jié)finally釋放鎖的時(shí)候一定要判斷isHeldByCurrentThread()。如果業(yè)務(wù)執(zhí)行異常鎖已經(jīng)過期釋放直接調(diào)用 unlock會(huì)把其他線程拿到的鎖給釋放掉這個(gè)坑不少人踩過。Redisson 自帶的看門狗機(jī)制如果業(yè)務(wù)執(zhí)行時(shí)間超過設(shè)置的 30 秒會(huì)自動(dòng)給鎖續(xù)期避免業(yè)務(wù)沒跑完鎖提前釋放這也是手寫 SETNX 鎖很難實(shí)現(xiàn)的能力。五、實(shí)際生產(chǎn)落地需要注意的幾個(gè)坑鎖粒度不要太大不要直接寫一個(gè)全局鎖所有商品共用同一個(gè) key。不同商品使用不同的 lockKey例如lock:goods:{goodsId}并發(fā)性能會(huì)高很多。分布式鎖不能完全替代數(shù)據(jù)庫層面防護(hù)分布式鎖也不是萬無一失。Redis 主從切換鎖有可能丟失。建議數(shù)據(jù)庫層面加上庫存版本號(hào)樂觀鎖作為兜底雙重防護(hù)杜絕超賣。簡單樂觀鎖更新示例update goods set stock stock?1, version version1 where id #{goodsId} and stock0 and version #{version};鎖和事務(wù)順序問題鎖要加在事務(wù)外面。如果鎖在事務(wù)內(nèi)部事務(wù)還沒提交完成鎖就釋放其他線程讀到未提交的數(shù)據(jù)依舊會(huì)出現(xiàn)并發(fā)問題。區(qū)分鎖類型普通搶購場景用可重入鎖 RLock讀寫場景可以考慮 Redisson 讀寫鎖如果是集群環(huán)境要配置 Redisson 的 Redis 集群模式不要單機(jī)配置。六、總結(jié)超賣問題本質(zhì)就是并發(fā)下共享資源競爭。數(shù)據(jù)庫樂觀鎖適合并發(fā)壓力一般的場景當(dāng) QPS 較高大量請(qǐng)求沖擊數(shù)據(jù)庫就需要引入分布式鎖。Redisson 把分布式鎖里面各種棘手問題鎖續(xù)期、可重入、防止誤釋放、異常處理全部封裝好了開發(fā)不用重復(fù)造輪子。但千萬不要覺得上了分布式鎖就萬事大吉。Redis 畢竟是中間件存在網(wǎng)絡(luò)、主從切換等不可控因素。生產(chǎn)環(huán)境建議Redisson 分布式鎖 數(shù)據(jù)庫樂觀鎖雙重兜底最大程度避免超賣事故。實(shí)際項(xiàng)目里面還可以繼續(xù)優(yōu)化結(jié)合 MQ 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