{"id":113386,"date":"2026-10-06T09:17:39","date_gmt":"2026-10-06T01:17:39","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/113386.html"},"modified":"2026-10-06T09:17:39","modified_gmt":"2026-10-06T01:17:39","slug":"redis-%e5%88%86%e5%b8%83%e5%bc%8f%e9%94%81%e7%9a%84%e8%be%b9%e7%95%8c%e6%9d%a1%e4%bb%b6%ef%bc%9aredlock-%e4%ba%89%e8%ae%ae%e3%80%81%e9%94%81%e7%bb%ad%e6%9c%9f%e4%b8%8e%e5%ae%a2%e6%88%b7%e7%ab%af","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/113386.html","title":{"rendered":"Redis \u5206\u5e03\u5f0f\u9501\u7684\u8fb9\u754c\u6761\u4ef6\uff1aRedlock \u4e89\u8bae\u3001\u9501\u7eed\u671f\u4e0e\u5ba2\u6237\u7aef\u5d29\u6e83\u540e\u7684\u4e92\u65a5\u5931\u6548"},"content":{"rendered":"

Redis \u5206\u5e03\u5f0f\u9501\u7684\u8fb9\u754c\u6761\u4ef6：Redlock \u4e89\u8bae\u3001\u9501\u7eed\u671f\u4e0e\u5ba2\u6237\u7aef\u5d29\u6e83\u540e\u7684\u4e92\u65a5\u5931\u6548<\/h2>\n

1. \u4ece\u4e00\u4e2a\u771f\u5b9e\u7684\u201c\u9501\u6ca1\u751f\u6548\u201d\u95ee\u9898\u8bf4\u8d77<\/h3>\n

\u5047\u8bbe\u73b0\u5728\u6709\u4e00\u4e2a\u5e93\u5b58\u6263\u51cf\u63a5\u53e3：\u4e24\u53f0\u5e94\u7528\u670d\u52a1\u5668 A \u548c B \u540c\u65f6\u6536\u5230\u540c\u4e00\u4e2a\u5546\u54c1\u7684\u4e0b\u5355\u8bf7\u6c42，\u5e93\u5b58\u53ea\u5269 1 \u4ef6\u3002\u4f60\u5728\u4ee3\u7801\u91cc\u5199\u4e86 synchronized，\u672c\u5730\u6d4b\u8bd5\u5b8c\u5168\u6b63\u5e38，\u53ef\u4e0a\u7ebf\u540e\u5076\u5c14\u51fa\u73b0\u8d85\u5356\u3002\u539f\u56e0\u5f88\u76f4\u63a5：synchronized \u53ea\u80fd\u7ba1\u4f4f\u540c\u4e00\u4e2a JVM \u91cc\u7684\u7ebf\u7a0b，A \u673a\u5668\u548c B \u673a\u5668\u4e4b\u95f4\u7684\u7ebf\u7a0b\u5b83\u7ba1\u4e0d\u5230\u3002<\/p>\n

\u4e8e\u662f\u4f60\u60f3\u5230\u7528 Redis \u52a0\u4e00\u628a\u201c\u5168\u5c40\u7684\u9501\u201d：\u8c01\u5148\u5728 Redis \u91cc\u5199\u5165\u4e00\u4e2a key，\u8c01\u5c31\u83b7\u5f97\u6267\u884c\u6743，\u6267\u884c\u5b8c\u518d\u5220\u6389 key\u3002\u542c\u8d77\u6765\u53ea\u9700\u8981 SETNX \u4e00\u4e2a\u547d\u4ee4，\u4f46\u771f\u6b63\u4e0a\u7ebf\u540e\u53c8\u4f1a\u51fa\u73b0\u65b0\u7684\u95ee\u9898：\u8fdb\u7a0b\u62ff\u5230\u9501\u4e4b\u540e\u5b95\u673a\u4e86，key \u6c38\u8fdc\u4e0d\u4f1a\u88ab\u5220\u9664，\u5176\u4ed6\u8bf7\u6c42\u5168\u90e8\u88ab\u5361\u6b7b；\u6216\u8005\u8fdb\u7a0b\u6267\u884c\u65f6\u95f4\u6bd4\u9884\u671f\u957f，\u9501\u63d0\u524d\u8fc7\u671f，\u7b2c\u4e8c\u4e2a\u8bf7\u6c42\u8fdb\u6765，\u4e24\u4e2a\u8fdb\u7a0b\u540c\u65f6\u64cd\u4f5c\u540c\u4e00\u4efd\u6570\u636e\u3002<\/p>\n

\u8fd9\u7bc7\u6587\u7ae0\u8981\u89e3\u51b3\u7684\u5c31\u662f\u8fd9\u4e9b\u8fb9\u754c\u6761\u4ef6\u3002\u5148\u8bb0\u4f4f\u4e00\u4e2a\u6700\u5c0f\u6a21\u578b：Redis \u5206\u5e03\u5f0f\u9501\u672c\u8d28\u4e0a\u662f\u4e00\u6b21\u201c\u5e26\u8fc7\u671f\u65f6\u95f4\u7684\u5360\u4f4d\u5199\u5165\u201d，\u8c01\u5199\u5165\u6210\u529f\u8c01\u5c31\u6301\u6709\u9501，\u91ca\u653e\u9501\u5c31\u662f\u628a\u5360\u4f4d\u5220\u6389\u3002 \u5b83\u89e3\u51b3\u7684\u662f\u8de8\u8fdb\u7a0b\u4e92\u65a5，\u4f46\u5b83\u4e0d\u4fdd\u8bc1\u6301\u6709\u8005\u5728\u6267\u884c\u671f\u95f4\u4e00\u5b9a\u4e0d\u4f1a\u88ab\u6253\u65ad，\u4e5f\u4e0d\u4fdd\u8bc1 Redis \u6545\u969c\u5207\u6362\u65f6\u9501\u72b6\u6001\u4e0d\u4e22\u5931\u3002<\/p>\n

\u672c\u6587\u9762\u5bf9\u7684\u662f\u5df2\u7ecf\u4f1a\u7528 SET NX PX\u3001\u4f46\u88ab\u201c\u9501\u7eed\u671f\u3001\u8bef\u5220\u3001Redlock\u3001\u4e3b\u4ece\u5207\u6362\u201d\u56f0\u6270\u7684 Java \u540e\u7aef\u5f00\u53d1\u8005\u4e0e\u67b6\u6784\u5e08\u3002\u8bfb\u5b8c\u4e4b\u540e，\u4f60\u5e94\u8be5\u80fd\u5224\u65ad：\u5f53\u524d\u4e1a\u52a1\u5230\u5e95\u8be5\u7528\u54ea\u79cd\u9501，\u4ee5\u53ca\u54ea\u4e9b\u60c5\u51b5\u4e0b Redis \u9501\u6839\u672c\u4e0d\u9002\u5408\u5355\u72ec\u627f\u62c5\u6b63\u786e\u6027\u3002<\/p>\n

2. \u6838\u5fc3\u6a21\u578b：\u4e09\u4e2a\u89d2\u8272\u4e0e\u4e00\u6b21\u52a0\u9501\u7684\u5b8c\u6574\u6d41\u8f6c<\/h3>\n

\u5148\u4e0d\u8981\u6025\u7740\u80cc\u547d\u4ee4\u3002\u628a\u6574\u4ef6\u4e8b\u62c6\u6210\u4e09\u4e2a\u89d2\u8272：\u9501\u7684\u4f7f\u7528\u8005（Java \u8fdb\u7a0b\u91cc\u7684\u4e1a\u52a1\u7ebf\u7a0b）\u3001\u9501\u7684\u5b58\u50a8\u8005（Redis \u5b9e\u4f8b\u6216\u96c6\u7fa4）\u3001\u9501\u7684\u7ade\u4e89\u5bf9\u8c61（\u540c\u4e00\u4efd\u5171\u4eab\u8d44\u6e90，\u4f8b\u5982\u8ba2\u5355\u3001\u5e93\u5b58\u3001\u5b9a\u65f6\u4efb\u52a1）\u3002\u4e09\u8005\u4e4b\u95f4\u901a\u8fc7\u201c\u5360\u4f4d\u5199\u5165 + \u8fc7\u671f\u65f6\u95f4 + \u552f\u4e00\u6807\u8bc6\u201d\u8fde\u63a5\u8d77\u6765\u3002<\/p>\n

\u4e00\u6b21\u6807\u51c6\u7684\u52a0\u9501\u6d41\u7a0b\u662f\u8fd9\u6837\u7684：\u4e1a\u52a1\u7ebf\u7a0b\u751f\u6210\u4e00\u4e2a\u5168\u5c40\u552f\u4e00\u7684 value（\u901a\u5e38\u662f UUID + \u7ebf\u7a0b ID），\u7136\u540e\u5411 Redis \u53d1\u9001\u4e00\u6761\u5e26 NX \u548c PX \u7684\u547d\u4ee4；Redis \u53ea\u6709\u5728 key \u4e0d\u5b58\u5728\u65f6\u624d\u5199\u5165\u6210\u529f，\u5e76\u540c\u65f6\u8bbe\u7f6e\u6beb\u79d2\u7ea7\u8fc7\u671f\u65f6\u95f4；\u4e1a\u52a1\u7ebf\u7a0b\u62ff\u5230\u6210\u529f\u7ed3\u679c\u540e\u6267\u884c\u4e34\u754c\u533a\u4ee3\u7801；\u6267\u884c\u5b8c\u6210\u540e，\u7528\u4e00\u6bb5 Lua \u811a\u672c\u5224\u65ad value \u662f\u5426\u5c5e\u4e8e\u81ea\u5df1\u7684，\u662f\u5219\u5220\u9664 key，\u4e0d\u662f\u5219\u4e0d\u5220\u3002<\/p>\n

+——————-+ +———————+ +——————+
\n| \u4e1a\u52a1\u7ebf\u7a0b A | | \u4e1a\u52a1\u7ebf\u7a0b B | | Redis \u5b9e\u4f8b |
\n| (Java \u8fdb\u7a0b 1) | | (Java \u8fdb\u7a0b 2) | | (\u9501\u5b58\u50a8\u8005) |
\n+———+———+ +———-+———-+ +———+——–+
\n | | |
\n | 1. SET lock uuidA NX PX 30000 |
\n |———————————————————->|
\n | | 2. \u5199\u5165\u6210\u529f，\u8fd4\u56de OK |
\n |<———————————————————-|
\n | | |
\n | 3. \u6267\u884c\u4e34\u754c\u533a\u4ee3\u7801 | 4. \u540c\u6837\u5c1d\u8bd5 SET lock uuidB |
\n | |—————————>|
\n | | 5. key \u5df2\u5b58\u5728，\u5931\u8d25 |
\n | |<—————————|
\n | | |
\n | 6. \u6267\u884c\u5b8c，Lua \u5224\u65ad value \u5e76\u5220\u9664 key |
\n |———————————————————->|
\n | | 7. \u5220\u9664\u6210\u529f |
\n |<———————————————————-|
\n | | |
\n | | 8. \u518d\u6b21\u5c1d\u8bd5，\u6210\u529f\u83b7\u5f97\u9501 |
\n | |—————————>|<\/p>\n

\u8fd9\u5f20\u56fe\u91cc\u6709\u4e09\u4e2a\u5173\u952e\u70b9，\u540e\u9762\u6bcf\u4e00\u8282\u90fd\u4f1a\u5bf9\u5e94\u5c55\u5f00：\u7b2c\u4e00，\u52a0\u9501\u5fc5\u987b\u662f\u4e00\u6b21\u539f\u5b50\u64cd\u4f5c，SET \u52a0\u4e0a NX\u3001PX \u53c2\u6570\u4e00\u6761\u547d\u4ee4\u5b8c\u6210，\u800c\u4e0d\u662f\u5148 SETNX \u518d EXPIRE，\u5426\u5219\u4e2d\u95f4\u5b95\u673a\u5c31\u4f1a\u7559\u4e0b\u6c38\u4e0d\u8fc7\u671f\u7684\u6b7b\u9501；\u7b2c\u4e8c，value \u5fc5\u987b\u662f\u552f\u4e00\u6807\u8bc6，\u5426\u5219\u65e0\u6cd5\u533a\u5206\u201c\u6211\u7684\u9501\u201d\u548c\u201c\u522b\u4eba\u7684\u9501\u201d，\u5220\u9664\u65f6\u5c31\u4f1a\u8bef\u5220；\u7b2c\u4e09，\u5220\u9664\u5fc5\u987b\u662f\u201c\u5224\u65ad + \u5220\u9664\u201d\u7684\u539f\u5b50\u64cd\u4f5c，\u4e2d\u95f4\u4e00\u65e6\u88ab\u63d2\u5165\u5176\u4ed6\u8bf7\u6c42，\u5c31\u4f1a\u628a\u522b\u4eba\u7684\u9501\u5220\u6389\u3002<\/p>\n

\u8fd9\u91cc\u6700\u5bb9\u6613\u8bef\u89e3\u7684\u662f：\u5f88\u591a\u4eba\u4ee5\u4e3a\u201ckey \u5b58\u5728\u5c31\u4ee3\u8868\u9501\u8fd8\u5728，\u4e1a\u52a1\u662f\u5b89\u5168\u7684\u201d\u3002\u5176\u5b9e key \u53ea\u80fd\u8bc1\u660e\u201c\u67d0\u4e2a\u65f6\u523b\u6709\u4eba\u5360\u8fc7\u4f4d\u201d，\u5b83\u4e0d\u80fd\u8bc1\u660e\u201c\u5f53\u524d\u6301\u6709\u8005\u4e00\u5b9a\u8fd8\u5728\u6267\u884c\u3001\u4e14\u6ca1\u6709\u88ab\u6682\u505c\u201d\u3002\u7406\u89e3\u8fd9\u4e00\u70b9，\u540e\u9762\u7684 Redlock \u4e89\u8bae\u548c\u5ba2\u6237\u7aef\u5d29\u6e83\u95ee\u9898\u624d\u6709\u843d\u811a\u70b9\u3002<\/p>\n

3. \u6700\u57fa\u7840\u7684\u52a0\u9501\u4e0e\u89e3\u9501：\u4e3a\u4ec0\u4e48\u5fc5\u987b\u662f SET NX PX + Lua<\/h3>\n

3.1 \u9519\u8bef\u5199\u6cd5\u4e0e\u6b63\u786e\u5199\u6cd5<\/h4>\n

\u5148\u770b\u4e00\u4e2a\u5e38\u89c1\u7684\u9519\u8bef\u5199\u6cd5，\u5b83\u628a\u52a0\u9501\u62c6\u6210\u4e86\u4e24\u4e2a\u547d\u4ee4：<\/p>\n

\/\/ \u6e90\u7801\u8282\u9009：\u9519\u8bef\u793a\u4f8b，\u4e0d\u80fd\u76f4\u63a5\u8fd0\u884c<\/span>
\npublic<\/span> boolean<\/span> wrongLock<\/span>(<\/span>Jedis<\/span> jedis,<\/span> String<\/span> key,<\/span> String<\/span> value)<\/span> {<\/span>
\n Long<\/span> result =<\/span> jedis.<\/span>setnx<\/span>(<\/span>key,<\/span> value)<\/span>;<\/span> \/\/ \u7b2c\u4e00\u6b65：\u5360\u4f4d<\/span>
\n if<\/span> (<\/span>result ==<\/span> 1<\/span>)<\/span> {<\/span>
\n jedis.<\/span>expire<\/span>(<\/span>key,<\/span> 30<\/span>)<\/span>;<\/span> \/\/ \u7b2c\u4e8c\u6b65：\u8bbe\u7f6e\u8fc7\u671f<\/span>
\n return<\/span> true<\/span>;<\/span>
\n }<\/span>
\n return<\/span> false<\/span>;<\/span>
\n}<\/span><\/p>\n

\u95ee\u9898\u5728\u4e8e：\u5982\u679c\u5728 setnx \u6210\u529f\u4e4b\u540e\u3001expire \u6267\u884c\u4e4b\u524d，\u8fd9\u53f0\u5e94\u7528\u8fdb\u7a0b\u5d29\u6e83，\u90a3\u4e48\u8fd9\u628a\u9501\u5c31\u6c38\u8fdc\u4e0d\u4f1a\u8fc7\u671f，\u5176\u4ed6\u6240\u6709\u8bf7\u6c42\u90fd\u4f1a\u88ab\u6c38\u4e45\u963b\u585e\u3002\u8fd9\u7c7b\u95ee\u9898\u5728\u7ebf\u4e0a\u8868\u73b0\u4e3a\u201c\u67d0\u4e2a\u5b9a\u65f6\u4efb\u52a1\u7684\u9501\u4e00\u76f4\u4e0d\u88ab\u91ca\u653e，\u91cd\u542f\u5e94\u7528\u4e5f\u6ca1\u7528，\u53ea\u80fd\u624b\u52a8\u5220 key\u201d\u3002<\/p>\n

\u6b63\u786e\u5199\u6cd5\u662f\u628a\u5360\u4f4d\u548c\u8fc7\u671f\u8bbe\u7f6e\u5408\u5e76\u4e3a\u4e00\u6761\u539f\u5b50\u547d\u4ee4：<\/p>\n

\/\/ \u6e90\u7801\u8282\u9009：\u6b63\u786e\u7684\u5355\u547d\u4ee4\u52a0\u9501<\/span>
\ntry<\/span> (<\/span>Jedis<\/span> jedis =<\/span> pool.<\/span>getResource<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
\n String<\/span> result =<\/span> jedis.<\/span>set<\/span>(<\/span>lockKey,<\/span> uniqueValue,<\/span> "NX"<\/span>,<\/span> "PX"<\/span>,<\/span> 30000<\/span>)<\/span>;<\/span>
\n return<\/span> "OK"<\/span>.<\/span>equals<\/span>(<\/span>result)<\/span>;<\/span>
\n}<\/span><\/p>\n

NX \u8868\u793a key \u4e0d\u5b58\u5728\u65f6\u624d\u5199\u5165，PX 30000 \u8868\u793a 30 \u79d2\u540e\u81ea\u52a8\u8fc7\u671f\u3002\u8fd9\u6761\u547d\u4ee4\u5728 Redis \u5185\u90e8\u662f\u4e00\u4e2a\u6574\u4f53，\u4e0d\u4f1a\u51fa\u73b0\u201c\u5199\u5165\u4e86\u4f46\u6ca1\u8bbe\u7f6e\u8fc7\u671f\u201d\u7684\u4e2d\u95f4\u72b6\u6001\u3002<\/p>\n

3.2 \u91ca\u653e\u9501\u4e3a\u4ec0\u4e48\u5fc5\u987b\u7528 Lua<\/h4>\n

\u91ca\u653e\u9501\u66f4\u5371\u9669\u3002\u5047\u8bbe\u4e1a\u52a1\u7ebf\u7a0b A \u62ff\u5230\u9501，value \u662f uuidA\u3002\u6267\u884c\u671f\u95f4\u56e0\u4e3a GC \u505c\u987f\u4e86 35 \u79d2，\u9501\u5728 30 \u79d2\u65f6\u5df2\u8fc7\u671f，\u7ebf\u7a0b B \u62ff\u5230\u4e86\u540c\u4e00\u628a\u9501，value \u662f uuidB\u3002\u6b64\u65f6 A \u6062\u590d\u6267\u884c，\u5982\u679c\u76f4\u63a5 DEL lockKey，\u5220\u6389\u7684\u662f B \u7684\u9501，B \u8fd8\u4ee5\u4e3a\u81ea\u5df1\u72ec\u4eab\u4e34\u754c\u533a，\u4e92\u65a5\u76f4\u63a5\u88ab\u6253\u7834\u3002<\/p>\n

\u6240\u4ee5\u91ca\u653e\u9501\u5fc5\u987b\u201c\u5148\u6bd4\u8f83 value\u3001\u518d\u5220\u9664\u201d，\u5e76\u4e14\u8fd9\u4e24\u4e2a\u52a8\u4f5c\u8981\u539f\u5b50\u5b8c\u6210\u3002Redis \u6267\u884c Lua \u811a\u672c\u65f6\u662f\u5355\u7ebf\u7a0b\u4e32\u884c\u6267\u884c\u7684，\u811a\u672c\u5185\u90e8\u4e0d\u4f1a\u63d2\u5165\u5176\u4ed6\u5ba2\u6237\u7aef\u547d\u4ee4，\u8fd9\u6b63\u662f\u6211\u4eec\u9700\u8981\u7684\u539f\u5b50\u6027：<\/p>\n

— \u89e3\u9501 Lua \u811a\u672c：\u53ea\u6709 value \u5339\u914d\u624d\u5220\u9664<\/span>
\nif<\/span> redis.<\/span>call<\/span>(<\/span>'get'<\/span>,<\/span> KEYS[<\/span>1<\/span>]<\/span>)<\/span> ==<\/span> ARGV[<\/span>1<\/span>]<\/span> then<\/span>
\n return<\/span> redis.<\/span>call<\/span>(<\/span>'del'<\/span>,<\/span> KEYS[<\/span>1<\/span>]<\/span>)<\/span>
\nelse<\/span>
\n return<\/span> 0<\/span>
\nend<\/span><\/p>\n

\/\/ \u6e90\u7801\u8282\u9009：Java \u4fa7\u8c03\u7528 Lua \u89e3\u9501<\/span>
\nprivate<\/span> static<\/span> final<\/span> String<\/span> UNLOCK_SCRIPT<\/span> =<\/span>
\n "if redis.call('get', KEYS[1]) == ARGV[1] then "<\/span> +<\/span>
\n "return redis.call('del', KEYS[1]) else return 0 end"<\/span>;<\/span><\/p>\n

public<\/span> boolean<\/span> unlock<\/span>(<\/span>Jedis<\/span> jedis,<\/span> String<\/span> key,<\/span> String<\/span> value)<\/span> {<\/span>
\n Object<\/span> result =<\/span> jedis.<\/span>eval<\/span>(<\/span>UNLOCK_SCRIPT<\/span>,<\/span>
\n Collections<\/span>.<\/span>singletonList<\/span>(<\/span>key)<\/span>,<\/span>
\n Collections<\/span>.<\/span>singletonList<\/span>(<\/span>value)<\/span>)<\/span>;<\/span>
\n return<\/span> Long<\/span>.<\/span>valueOf<\/span>(<\/span>1L<\/span>)<\/span>.<\/span>equals<\/span>(<\/span>result)<\/span>;<\/span>
\n}<\/span><\/p>\n

\u8fd9\u91cc\u6700\u5bb9\u6613\u51fa\u9519\u7684\u5730\u65b9\u662f\u628a Lua \u53c2\u6570\u987a\u5e8f\u5199\u53cd：KEYS[1] \u5fc5\u987b\u662f\u9501 key，ARGV[1] \u5fc5\u987b\u662f\u5f53\u524d\u7ebf\u7a0b\u7684\u552f\u4e00 value\u3002\u5982\u679c\u4f20\u53cd，\u811a\u672c\u6c38\u8fdc\u8fd4\u56de 0，\u9501\u4e0d\u4f1a\u88ab\u91ca\u653e；\u5982\u679c\u6f0f\u4f20 value \u800c\u7528 DEL \u76f4\u63a5\u5220，\u5c31\u9000\u56de\u5230\u8bef\u5220\u522b\u4eba\u9501\u7684\u8001\u95ee\u9898\u3002<\/p>\n

\u4e0b\u8868\u628a\u51e0\u79cd\u5e38\u89c1\u5199\u6cd5\u7684\u98ce\u9669\u6446\u5728\u4e00\u8d77：<\/p>\n\n\u5199\u6cd5\u52a0\u9501\u539f\u5b50\u6027\u91ca\u653e\u5b89\u5168\u6027\u4e3b\u8981\u98ce\u9669<\/tr>\n\n\n\n\n\n
SETNX + EXPIRE \u4e24\u6b65<\/td>\n\u5426<\/td>\n\u65e0\u5224\u65ad\u76f4\u63a5\u5220<\/td>\n\u4e2d\u95f4\u5b95\u673a\u5bfc\u81f4\u6b7b\u9501；\u8bef\u5220\u4ed6\u4eba\u9501<\/td>\n<\/tr>\n
SET NX PX \u5355\u547d\u4ee4<\/td>\n\u662f<\/td>\n\u65e0\u5224\u65ad\u76f4\u63a5\u5220<\/td>\n\u9501\u8fc7\u671f\u540e\u8bef\u5220\u4ed6\u4eba\u9501<\/td>\n<\/tr>\n
SET NX PX + Lua \u6bd4\u8f83\u5220\u9664<\/td>\n\u662f<\/td>\n\u5b89\u5168<\/td>\n\u4ecd\u65e0\u6cd5\u89e3\u51b3\u4e1a\u52a1\u8d85\u65f6\u4e0e\u4e3b\u4ece\u5207\u6362<\/td>\n<\/tr>\n
Redlock \u591a\u8282\u70b9\u52a0\u9501<\/td>\n\u662f（\u591a\u6570\u6d3e）<\/td>\n\u5b89\u5168<\/td>\n\u4e89\u8bae\u5927，\u4ecd\u53d7\u65f6\u949f\u4e0e\u6682\u505c\u5f71\u54cd<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

4. \u5b8c\u6574\u793a\u4f8b\u4e00：\u53ef\u8fd0\u884c\u7684 Redis \u5355\u673a\u5206\u5e03\u5f0f\u9501<\/h3>\n

\u76ee\u6807：\u7528\u6700\u5c0f\u4f9d\u8d56\u5b9e\u73b0\u4e00\u628a\u53ef\u590d\u73b0\u7684 Redis \u5355\u673a\u9501，\u9a8c\u8bc1\u201c\u4e92\u65a5\u201d\u201c\u8fc7\u671f\u201d\u201c\u91ca\u653e\u201d\u4e09\u4ef6\u4e8b\u3002<\/p>\n

\u524d\u7f6e\u73af\u5883：\u672c\u5730\u6216\u5bb9\u5668\u542f\u52a8 Redis 6.x \u4ee5\u4e0a，\u7aef\u53e3 6379；JDK 8+；Maven \u9879\u76ee\u5f15\u5165 redis.clients:jedis:4.4.3\u3002<\/p>\n

\u8f93\u5165：\u4e00\u4e2a\u6a21\u62df\u7684\u5e93\u5b58\u53d8\u91cf，\u521d\u59cb\u503c 100，\u542f\u52a8 20 \u4e2a\u7ebf\u7a0b\u5404\u6263\u51cf 5 \u6b21\u3002<\/p>\n

import<\/span> redis.<\/span>clients.<\/span>jedis.<\/span><\/span>Jedis<\/span><\/span>;<\/span>
\nimport<\/span> redis.<\/span>clients.<\/span>jedis.<\/span><\/span>JedisPool<\/span><\/span>;<\/span>
\nimport<\/span> redis.<\/span>clients.<\/span>jedis.<\/span>params.<\/span><\/span>SetParams<\/span><\/span>;<\/span><\/p>\n

import<\/span> java.<\/span>util.<\/span><\/span>Collections<\/span><\/span>;<\/span>
\nimport<\/span> java.<\/span>util.<\/span><\/span>UUID<\/span><\/span>;<\/span>
\nimport<\/span> java.<\/span>util.<\/span>concurrent.<\/span><\/span>CountDownLatch<\/span><\/span>;<\/span>
\nimport<\/span> java.<\/span>util.<\/span>concurrent.<\/span><\/span>ExecutorService<\/span><\/span>;<\/span>
\nimport<\/span> java.<\/span>util.<\/span>concurrent.<\/span><\/span>Executors<\/span><\/span>;<\/span><\/p>\n

public<\/span> class<\/span> SimpleRedisLockDemo<\/span> {<\/span><\/p>\n

private<\/span> static<\/span> final<\/span> String<\/span> LOCK_KEY<\/span> =<\/span> "lock:stock:sku1001"<\/span>;<\/span>
\n private<\/span> static<\/span> final<\/span> String<\/span> UNLOCK_SCRIPT<\/span> =<\/span>
\n "if redis.call('get', KEYS[1]) == ARGV[1] then "<\/span> +<\/span>
\n "return redis.call('del', KEYS[1]) else return 0 end"<\/span>;<\/span><\/p>\n

private<\/span> static<\/span> JedisPool<\/span> pool;<\/span>
\n private<\/span> static<\/span> int<\/span> stock =<\/span> 100<\/span>;<\/span> \/\/ \u4ec5\u7528\u4e8e\u6f14\u793a，\u771f\u5b9e\u5e93\u5b58\u5e94\u5728\u6570\u636e\u5e93\u6216 Redis \u4e2d<\/span><\/p>\n

public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> throws<\/span> InterruptedException<\/span> {<\/span>
\n pool =<\/span> new<\/span> JedisPool<\/span>(<\/span>"127.0.0.1"<\/span>,<\/span> 6379<\/span>)<\/span>;<\/span>
\n CountDownLatch<\/span> start =<\/span> new<\/span> CountDownLatch<\/span>(<\/span>1<\/span>)<\/span>;<\/span>
\n ExecutorService<\/span> es =<\/span> Executors<\/span>.<\/span>newFixedThreadPool<\/span>(<\/span>20<\/span>)<\/span>;<\/span>
\n for<\/span> (<\/span>int<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> 20<\/span>;<\/span> i++<\/span>)<\/span> {<\/span>
\n es.<\/span>submit<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
\n try<\/span> {<\/span>
\n start.<\/span>await<\/span>(<\/span>)<\/span>;<\/span>
\n deductWithLock<\/span>(<\/span>)<\/span>;<\/span>
\n }<\/span> catch<\/span> (<\/span>Exception<\/span> e)<\/span> {<\/span>
\n Thread<\/span>.<\/span>currentThread<\/span>(<\/span>)<\/span>.<\/span>interrupt<\/span>(<\/span>)<\/span>;<\/span>
\n }<\/span>
\n }<\/span>)<\/span>;<\/span>
\n }<\/span>
\n start.<\/span>countDown<\/span>(<\/span>)<\/span>;<\/span>
\n Thread<\/span>.<\/span>sleep<\/span>(<\/span>8000<\/span>)<\/span>;<\/span>
\n es.<\/span>shutdownNow<\/span>(<\/span>)<\/span>;<\/span>
\n pool.<\/span>close<\/span>(<\/span>)<\/span>;<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"final stock = "<\/span> +<\/span> stock)<\/span>;<\/span>
\n }<\/span><\/p>\n

private<\/span> static<\/span> void<\/span> deductWithLock<\/span>(<\/span>)<\/span> throws<\/span> InterruptedException<\/span> {<\/span>
\n String<\/span> value =<\/span> UUID<\/span>.<\/span>randomUUID<\/span>(<\/span>)<\/span>.<\/span>toString<\/span>(<\/span>)<\/span>;<\/span>
\n Jedis<\/span> jedis =<\/span> pool.<\/span>getResource<\/span>(<\/span>)<\/span>;<\/span>
\n try<\/span> {<\/span>
\n SetParams<\/span> params =<\/span> SetParams<\/span>.<\/span>setParams<\/span>(<\/span>)<\/span>.<\/span>nx<\/span>(<\/span>)<\/span>.<\/span>px<\/span>(<\/span>5000<\/span>)<\/span>;<\/span>
\n long<\/span> deadline =<\/span> System<\/span>.<\/span>currentTimeMillis<\/span>(<\/span>)<\/span> +<\/span> 3000<\/span>;<\/span>
\n while<\/span> (<\/span>System<\/span>.<\/span>currentTimeMillis<\/span>(<\/span>)<\/span> <<\/span> deadline)<\/span> {<\/span>
\n if<\/span> (<\/span>"OK"<\/span>.<\/span>equals<\/span>(<\/span>jedis.<\/span>set<\/span>(<\/span>LOCK_KEY<\/span>,<\/span> value,<\/span> params)<\/span>)<\/span>)<\/span> {<\/span>
\n try<\/span> {<\/span>
\n deductOnce<\/span>(<\/span>)<\/span>;<\/span>
\n }<\/span> finally<\/span> {<\/span>
\n jedis.<\/span>eval<\/span>(<\/span>UNLOCK_SCRIPT<\/span>,<\/span>
\n Collections<\/span>.<\/span>singletonList<\/span>(<\/span>LOCK_KEY<\/span>)<\/span>,<\/span>
\n Collections<\/span>.<\/span>singletonList<\/span>(<\/span>value)<\/span>)<\/span>;<\/span>
\n }<\/span>
\n return<\/span>;<\/span>
\n }<\/span>
\n Thread<\/span>.<\/span>sleep<\/span>(<\/span>20<\/span>)<\/span>;<\/span>
\n }<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u83b7\u53d6\u9501\u8d85\u65f6，\u653e\u5f03\u672c\u6b21\u6263\u51cf"<\/span>)<\/span>;<\/span>
\n }<\/span> finally<\/span> {<\/span>
\n jedis.<\/span>close<\/span>(<\/span>)<\/span>;<\/span>
\n }<\/span>
\n }<\/span><\/p>\n

private<\/span> static<\/span> void<\/span> deductOnce<\/span>(<\/span>)<\/span> throws<\/span> InterruptedException<\/span> {<\/span>
\n \/\/ \u6a21\u62df\u6570\u636e\u5e93\u6216\u8fdc\u7a0b\u8c03\u7528\u8017\u65f6，\u66b4\u9732\u9501\u8fc7\u671f\u7a97\u53e3<\/span>
\n int<\/span> current =<\/span> stock;<\/span>
\n Thread<\/span>.<\/span>sleep<\/span>(<\/span>5<\/span>)<\/span>;<\/span>
\n stock =<\/span> current –<\/span> 1<\/span>;<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>Thread<\/span>.<\/span>currentThread<\/span>(<\/span>)<\/span>.<\/span>getName<\/span>(<\/span>)<\/span> +<\/span> " -> stock="<\/span> +<\/span> stock)<\/span>;<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

\u5173\u952e\u6b65\u9aa4：\u6bcf\u4e2a\u7ebf\u7a0b\u751f\u6210\u72ec\u7acb value；\u7528 SET NX PX \u62a2\u9501，\u6700\u957f\u7b49\u5f85 3 \u79d2；\u62a2\u5230\u540e\u6263\u51cf\u4e00\u6b21\u5e93\u5b58，\u518d\u5728 finally \u4e2d\u7528 Lua \u91ca\u653e\u9501；jedis.close() \u628a\u8fde\u63a5\u8fd8\u7ed9\u8fde\u63a5\u6c60\u800c\u4e0d\u662f\u5173\u95ed\u8fde\u63a5\u6c60\u672c\u8eab\u3002<\/p>\n

\u9884\u671f\u7ed3\u679c：\u6700\u7ec8 final stock \u5e94\u4e3a 0，\u8bf4\u660e 100 \u6b21\u6263\u51cf\u90fd\u6210\u529f\u6267\u884c\u4e14\u6ca1\u6709\u5e76\u53d1\u8986\u76d6；\u5982\u679c\u6ca1\u52a0\u9501，stock \u901a\u5e38\u4f1a\u5927\u4e8e 0，\u56e0\u4e3a\u591a\u4e2a\u7ebf\u7a0b\u8bfb\u5230\u540c\u4e00\u4e2a\u65e7\u503c\u3002<\/p>\n

\u9002\u7528\u573a\u666f：\u5355\u5b9e\u4f8b Redis \u4e14\u4e1a\u52a1\u6267\u884c\u65f6\u95f4\u8fdc\u5c0f\u4e8e\u9501\u8fc7\u671f\u65f6\u95f4\u7684\u5185\u90e8\u4efb\u52a1\u3002\u5bb9\u6613\u6539\u9519\u7684\u5730\u65b9：\u628a SetParams \u5199\u6210 nx() \u4f46\u5fd8\u4e86 px()，\u4f1a\u9000\u5316\u6210\u6c38\u4e0d\u8fc7\u671f\u7684\u6b7b\u9501；\u628a value \u63d0\u5230\u65b9\u6cd5\u5916\u5171\u4eab，\u4f1a\u5bfc\u81f4\u4e0d\u540c\u7ebf\u7a0b\u7528\u540c\u4e00\u4e2a\u503c，Lua \u5224\u65ad\u5931\u53bb\u610f\u4e49\u3002<\/p>\n

5. \u9501\u7eed\u671f\u4e0e watchdog：\u4e1a\u52a1\u6bd4\u9501\u6d3b\u5f97\u4e45\u600e\u4e48\u529e<\/h3>\n

5.1 \u56fa\u5b9a\u8fc7\u671f\u65f6\u95f4\u7684\u4e24\u96be<\/h4>\n

\u9501\u8fc7\u671f\u65f6\u95f4\u8bbe\u591a\u957f\u90fd\u522b\u626d\u3002\u8bbe 30 \u79d2，\u4e1a\u52a1\u6267\u884c 40 \u79d2\u65f6\u9501\u63d0\u524d\u91ca\u653e，\u7b2c\u4e8c\u4e2a\u8fdb\u7a0b\u8fdb\u6765\u4e86，\u4e92\u65a5\u5931\u6548；\u8bbe 5 \u5206\u949f，\u8fdb\u7a0b\u5d29\u6e83\u540e\u8981\u7b49 5 \u5206\u949f\u624d\u80fd\u6062\u590d，\u8fd9\u671f\u95f4\u6240\u6709\u8bf7\u6c42\u90fd\u5728\u7b49\u5f85，\u6545\u969c\u6062\u590d\u65f6\u95f4\u88ab\u62c9\u957f\u3002<\/p>\n

\u73b0\u5b9e\u4e2d\u4e1a\u52a1\u6267\u884c\u65f6\u95f4\u5e76\u4e0d\u7a33\u5b9a：\u4e00\u6b21\u6570\u636e\u5e93\u6162\u67e5\u8be2\u3001\u4e00\u6b21 Full GC\u3001\u4e00\u6b21\u7f51\u7edc\u6296\u52a8，\u90fd\u53ef\u80fd\u8ba9\u672c\u6765 200 \u6beb\u79d2\u7684\u4efb\u52a1\u53d8\u6210 10 \u79d2\u3002\u56fa\u5b9a\u8fc7\u671f\u65f6\u95f4\u76f8\u5f53\u4e8e\u8d4c\u201c\u4e1a\u52a1\u4e00\u5b9a\u80fd\u5728\u8fc7\u671f\u524d\u8dd1\u5b8c\u201d，\u800c\u5206\u5e03\u5f0f\u7cfb\u7edf\u91cc\u8fd9\u79cd\u8d4c\u6ce8\u5e76\u4e0d\u5b89\u5168\u3002<\/p>\n

5.2 watchdog \u7684\u601d\u8def<\/h4>\n

\u89e3\u51b3\u65b9\u5411\u662f\u201c\u9501\u7eed\u671f\u201d（renewal），\u4e5f\u5c31\u662f\u7ed9\u9501\u52a0\u4e00\u4e2a\u81ea\u52a8\u7eed\u547d\u7684\u5b88\u62a4\u7ebf\u7a0b，\u5e38\u88ab\u79f0\u4e3a watchdog\u3002\u5b83\u7684\u5de5\u4f5c\u65b9\u5f0f\u5f88\u6734\u7d20：\u5728\u9501\u5373\u5c06\u8fc7\u671f\u65f6，\u7531\u540e\u53f0\u7ebf\u7a0b\u68c0\u67e5\u6301\u6709\u8005\u662f\u5426\u8fd8\u6d3b\u7740，\u5982\u679c\u6d3b\u7740\u5c31\u628a\u8fc7\u671f\u65f6\u95f4\u91cd\u65b0\u5ef6\u957f\u4e00\u6bb5\u65f6\u95f4，\u5982\u6b64\u5faa\u73af，\u76f4\u5230\u4e1a\u52a1\u4e3b\u52a8\u91ca\u653e\u9501\u3002<\/p>\n

Redisson \u7684\u770b\u95e8\u72d7\u673a\u5236\u5c31\u662f\u5178\u578b\u5b9e\u73b0：\u52a0\u9501\u65f6\u4e0d\u6307\u5b9a\u8fc7\u671f\u65f6\u95f4，\u9ed8\u8ba4\u4f7f\u7528 lockWatchdogTimeout（\u9ed8\u8ba4 30 \u79d2）；\u540e\u53f0\u4efb\u52a1\u6bcf\u9694\u7ea6 10 \u79d2（\u8fc7\u671f\u65f6\u95f4\u7684 1\/3）\u7eed\u671f\u4e00\u6b21；\u53ea\u6709\u201c\u6ca1\u6709\u663e\u5f0f\u6307\u5b9a leaseTime\u201d\u65f6\u624d\u4f1a\u542f\u7528\u770b\u95e8\u72d7\u3002<\/p>\n

\u65f6\u95f4\u8f74（\u6beb\u79d2）
\n0 10000 20000 30000 40000
\n|———|———|———|———|
\n\u4e1a\u52a1\u5f00\u59cb | | | \u4e1a\u52a1\u7ed3\u675f
\n\u62a2\u5230\u9501 | | | \u4e3b\u52a8\u91ca\u653e
\n | | |
\n \u7eed\u671f\u4e00\u6b21 \u7eed\u671f\u4e00\u6b21 \u7eed\u671f\u4e00\u6b21
\n (\u91cd\u7f6e\u4e3a30s) (\u91cd\u7f6e\u4e3a30s) (\u91cd\u7f6e\u4e3a30s)<\/p>\n

\u5982\u679c\u8fdb\u7a0b\u5728\u7b2c 15 \u79d2\u5d29\u6e83：
\n0 10000 20000 30000
\n|———|———|———|
\n\u62a2\u5230\u9501 \u7eed\u671f\u4e00\u6b21 X \u8fdb\u7a0b\u5d29\u6e83
\n |
\n \u5269\u4f59 TTL \u7ea6 20 \u79d2\u540e\u81ea\u52a8\u8fc7\u671f
\n \u5176\u4ed6\u8bf7\u6c42\u6700\u591a\u7b49\u5f85 20 \u79d2<\/p>\n

\u8fd9\u4e2a\u7c7b\u6bd4\u80fd\u5e2e\u52a9\u4f60\u7406\u89e3\u201c\u7eed\u671f\u662f\u5728\u548c\u8fc7\u671f\u8d5b\u8dd1\u201d，\u4f46\u5b83\u4e0d\u80fd\u66ff\u4ee3\u771f\u5b9e\u673a\u5236：\u7eed\u671f\u4e0d\u662f\u65e0\u6761\u4ef6\u65e0\u9650\u5ef6\u957f，\u5982\u679c\u8fdb\u7a0b\u5d29\u6e83\u6216\u7f51\u7edc\u65ad\u5f00，\u7eed\u671f\u5faa\u73af\u672c\u8eab\u4e5f\u4f1a\u505c\u6b62，\u9501\u6700\u7ec8\u4ecd\u4f1a\u8fc7\u671f\u3002\u770b\u95e8\u72d7\u89e3\u51b3\u7684\u662f\u201c\u4e1a\u52a1\u6bd4\u9884\u671f\u6162\u201d，\u4e0d\u662f\u201c\u8fdb\u7a0b\u5df2\u7ecf\u6b7b\u4e86\u201d\u3002<\/p>\n

5.3 \u7528 Java \u624b\u5199\u4e00\u4e2a\u7b80\u5316\u7248 watchdog<\/h4>\n

\u4e0b\u9762\u8fd9\u6bb5\u662f\u7b80\u5316\u4ee3\u7801，\u7528\u4e8e\u8bf4\u660e\u7eed\u671f\u903b\u8f91，\u4e0d\u63a8\u8350\u76f4\u63a5\u7528\u4e8e\u751f\u4ea7：<\/p>\n

\/\/ \u7b80\u5316\u4ee3\u7801：\u6f14\u793a\u7eed\u671f\u601d\u8def，\u4e0d\u80fd\u76f4\u63a5\u66ff\u4ee3\u6210\u719f\u9501\u5b9e\u73b0<\/span>
\npublic<\/span> class<\/span> SimpleWatchdog<\/span> {<\/span><\/p>\n

private<\/span> static<\/span> final<\/span> long<\/span> LEASE_MS<\/span> =<\/span> 30_000<\/span>;<\/span>
\n private<\/span> static<\/span> final<\/span> long<\/span> RENEW_INTERVAL_MS<\/span> =<\/span> 10_000<\/span>;<\/span><\/p>\n

private<\/span> volatile<\/span> boolean<\/span> running =<\/span> true<\/span>;<\/span><\/p>\n

public<\/span> void<\/span> startRenewal<\/span>(<\/span>Jedis<\/span> jedis,<\/span> String<\/span> lockKey,<\/span> String<\/span> value)<\/span> {<\/span>
\n Thread<\/span> t =<\/span> new<\/span> Thread<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
\n String<\/span> script =<\/span> "if redis.call('get', KEYS[1]) == ARGV[1] then "<\/span> +<\/span>
\n "return redis.call('pexpire', KEYS[1], ARGV[2]) else return 0 end"<\/span>;<\/span>
\n while<\/span> (<\/span>running)<\/span> {<\/span>
\n try<\/span> {<\/span>
\n Thread<\/span>.<\/span>sleep<\/span>(<\/span>RENEW_INTERVAL_MS<\/span>)<\/span>;<\/span>
\n Object<\/span> r =<\/span> jedis.<\/span>eval<\/span>(<\/span>script,<\/span>
\n Collections<\/span>.<\/span>singletonList<\/span>(<\/span>lockKey)<\/span>,<\/span>
\n Arrays<\/span>.<\/span>asList<\/span>(<\/span>value,<\/span> String<\/span>.<\/span>valueOf<\/span>(<\/span>LEASE_MS<\/span>)<\/span>)<\/span>)<\/span>;<\/span>
\n if<\/span> (<\/span>Long<\/span>.<\/span>valueOf<\/span>(<\/span>0L<\/span>)<\/span>.<\/span>equals<\/span>(<\/span>r)<\/span>)<\/span> {<\/span>
\n \/\/ \u9501\u5df2\u4e0d\u5c5e\u4e8e\u81ea\u5df1，\u505c\u6b62\u7eed\u671f<\/span>
\n running =<\/span> false<\/span>;<\/span>
\n }<\/span>
\n }<\/span> catch<\/span> (<\/span>InterruptedException<\/span> e)<\/span> {<\/span>
\n Thread<\/span>.<\/span>currentThread<\/span>(<\/span>)<\/span>.<\/span>interrupt<\/span>(<\/span>)<\/span>;<\/span>
\n running =<\/span> false<\/span>;<\/span>
\n }<\/span>
\n }<\/span>
\n }<\/span>,<\/span> "lock-watchdog"<\/span>)<\/span>;<\/span>
\n t.<\/span>setDaemon<\/span>(<\/span>true<\/span>)<\/span>;<\/span>
\n t.<\/span>start<\/span>(<\/span>)<\/span>;<\/span>
\n }<\/span><\/p>\n

public<\/span> void<\/span> stop<\/span>(<\/span>)<\/span> {<\/span>
\n running =<\/span> false<\/span>;<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

\u5173\u952e\u70b9：\u7eed\u671f\u524d\u5fc5\u987b\u518d\u6b21\u6821\u9a8c value，\u786e\u4fdd\u9501\u8fd8\u5c5e\u4e8e\u81ea\u5df1；\u7eed\u671f\u811a\u672c\u540c\u6837\u8981\u7528 Lua \u539f\u5b50\u6267\u884c；\u4e1a\u52a1\u91ca\u653e\u9501\u65f6\u8981\u5148\u505c\u6389\u7eed\u671f\u7ebf\u7a0b，\u5426\u5219\u91ca\u653e\u4e4b\u540e\u770b\u95e8\u72d7\u53c8\u628a key \u5199\u56de\u6765，\u4f1a\u5236\u9020\u201c\u5e7d\u7075\u9501\u201d\u3002\u8fd9\u4e5f\u662f\u751f\u4ea7\u4e2d\u4f7f\u7528 Redisson \u6bd4\u81ea\u5df1\u624b\u5199\u66f4\u7a33\u7684\u539f\u56e0：\u91ca\u653e\u3001\u7eed\u671f\u3001\u91cd\u5165\u3001\u5f02\u5e38\u8def\u5f84\u90fd\u5df2\u7ecf\u5c01\u88c5\u597d\u3002<\/p>\n

6. \u5b8c\u6574\u793a\u4f8b\u4e8c：Spring Boot + Redisson \u7684\u53ef\u91cd\u5165\u9501\u4e0e\u770b\u95e8\u72d7<\/h3>\n

\u76ee\u6807：\u5728 Spring Boot \u4e2d\u96c6\u6210 Redisson，\u9a8c\u8bc1\u53ef\u91cd\u5165\u3001\u81ea\u52a8\u7eed\u671f\u4e0e\u8d85\u65f6\u653e\u5f03\u3002<\/p>\n

\u524d\u7f6e\u73af\u5883：Spring Boot 2.7+，JDK 8+，Redis 6.x（\u5355\u673a\u5373\u53ef），\u4f9d\u8d56 org.redisson:redisson-spring-boot-starter:3.23.5\u3002<\/p>\n

\u8f93\u5165：\u4e00\u4e2a\u8ba2\u5355\u5904\u7406\u63a5\u53e3，\u6a21\u62df 3 \u79d2\u4e1a\u52a1\u903b\u8f91；\u628a\u770b\u95e8\u72d7\u8d85\u65f6\u8c03\u5230 5 \u79d2，\u89c2\u5bdf\u7eed\u671f\u662f\u5426\u751f\u6548\u3002<\/p>\n

# application.yml<\/span>
\nspring<\/span>:<\/span>
\n redis<\/span>:<\/span>
\n host<\/span>:<\/span> 127.0.0.1
\n port<\/span>:<\/span> 6379<\/span><\/p>\n

# \u81ea\u5b9a\u4e49 Redisson \u914d\u7f6e<\/span>
\nredisson<\/span>:<\/span>
\n lock-watchdog-timeout<\/span>:<\/span> 5000<\/span><\/p>\n

import<\/span> org.<\/span>redisson.<\/span>api.<\/span><\/span>RLock<\/span><\/span>;<\/span>
\nimport<\/span> org.<\/span>redisson.<\/span>api.<\/span><\/span>RedissonClient<\/span><\/span>;<\/span>
\nimport<\/span> org.<\/span>springframework.<\/span>beans.<\/span>factory.<\/span>annotation.<\/span><\/span>Autowired<\/span><\/span>;<\/span>
\nimport<\/span> org.<\/span>springframework.<\/span>web.<\/span>bind.<\/span>annotation.<\/span><\/span>PostMapping<\/span><\/span>;<\/span>
\nimport<\/span> org.<\/span>springframework.<\/span>web.<\/span>bind.<\/span>annotation.<\/span><\/span>RequestParam<\/span><\/span>;<\/span>
\nimport<\/span> org.<\/span>springframework.<\/span>web.<\/span>bind.<\/span>annotation.<\/span><\/span>RestController<\/span><\/span>;<\/span><\/p>\n

import<\/span> java.<\/span>util.<\/span>concurrent.<\/span><\/span>TimeUnit<\/span><\/span>;<\/span><\/p>\n

@RestController<\/span>
\npublic<\/span> class<\/span> OrderController<\/span> {<\/span><\/p>\n

@Autowired<\/span>
\n private<\/span> RedissonClient<\/span> redissonClient;<\/span><\/p>\n

@PostMapping<\/span>(<\/span>"\/order\/process"<\/span>)<\/span>
\n public<\/span> String<\/span> process<\/span>(<\/span>@RequestParam<\/span> String<\/span> orderId)<\/span> throws<\/span> InterruptedException<\/span> {<\/span>
\n String<\/span> lockKey =<\/span> "lock:order:"<\/span> +<\/span> orderId;<\/span>
\n RLock<\/span> lock =<\/span> redissonClient.<\/span>getLock<\/span>(<\/span>lockKey)<\/span>;<\/span>
\n boolean<\/span> acquired =<\/span> false<\/span>;<\/span>
\n try<\/span> {<\/span>
\n \/\/ \u6700\u591a\u7b49 2 \u79d2；leaseTime \u4e0d\u4f20，\u542f\u7528\u770b\u95e8\u72d7\u81ea\u52a8\u7eed\u671f<\/span>
\n acquired =<\/span> lock.<\/span>tryLock<\/span>(<\/span>2<\/span>,<\/span> TimeUnit<\/span>.<\/span>SECONDS<\/span>)<\/span>;<\/span>
\n if<\/span> (<\/span>!<\/span>acquired)<\/span> {<\/span>
\n return<\/span> "\u5904\u7406\u4e2d，\u8bf7\u7a0d\u540e\u91cd\u8bd5"<\/span>;<\/span>
\n }<\/span>
\n Thread<\/span>.<\/span>sleep<\/span>(<\/span>3000<\/span>)<\/span>;<\/span> \/\/ \u6a21\u62df\u4e1a\u52a1\u5904\u7406，\u8d85\u8fc7\u9ed8\u8ba4\u770b\u95e8\u72d7\u65f6\u95f4<\/span>
\n return<\/span> "\u8ba2\u5355 "<\/span> +<\/span> orderId +<\/span> " \u5904\u7406\u5b8c\u6210"<\/span>;<\/span>
\n }<\/span> finally<\/span> {<\/span>
\n if<\/span> (<\/span>acquired &&<\/span> lock.<\/span>isHeldByCurrentThread<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
\n lock.<\/span>unlock<\/span>(<\/span>)<\/span>;<\/span>
\n }<\/span>
\n }<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

\u5173\u952e\u6b65\u9aa4：tryLock(2, TimeUnit.SECONDS) \u53ea\u7b49\u5f85 2 \u79d2，\u907f\u514d\u8bf7\u6c42\u5806\u79ef；\u663e\u5f0f\u4e0d\u4f20 leaseTime，\u8ba9\u770b\u95e8\u72d7\u4ee5\u914d\u7f6e\u7684 5 \u79d2\u4e3a\u5468\u671f\u81ea\u52a8\u7eed\u671f；unlock() \u524d\u5224\u65ad isHeldByCurrentThread()，\u9632\u6b62\u672a\u6301\u9501\u65f6\u91ca\u653e\u629b\u51fa IllegalMonitorStateException\u3002<\/p>\n

\u9884\u671f\u7ed3\u679c：\u540c\u4e00\u4e2a orderId \u5e76\u53d1\u8bf7\u6c42\u53ea\u6709\u4e00\u4e2a\u6210\u529f\u8fdb\u5165\u4e1a\u52a1，\u5176\u4ed6\u8fd4\u56de\u201c\u5904\u7406\u4e2d\u201d；\u4e1a\u52a1\u6267\u884c 3 \u79d2\u8d85\u8fc7\u4e86\u521d\u59cb 5 \u79d2\u5468\u671f\u7684\u4e00\u90e8\u5206，\u4f46\u4e0d\u4f1a\u56e0\u8fc7\u671f\u88ab\u7b2c\u4e8c\u4e2a\u8bf7\u6c42\u62a2\u5360，\u8fd9\u6b63\u662f\u7eed\u671f\u751f\u6548\u7684\u8868\u73b0\u3002<\/p>\n

\u9002\u7528\u573a\u666f：\u9700\u8981\u53ef\u91cd\u5165\u3001\u81ea\u52a8\u7eed\u671f\u3001\u5931\u8d25\u91cd\u8bd5\u7684\u4f01\u4e1a\u5185\u90e8\u4e1a\u52a1\u3002\u5bb9\u6613\u6539\u9519\u7684\u5730\u65b9：\u4e00\u65e6\u663e\u5f0f\u4f20\u5165 leaseTime，\u770b\u95e8\u72d7\u5c31\u4e0d\u518d\u7eed\u671f，\u957f\u4e1a\u52a1\u4f1a\u76f4\u63a5\u8fc7\u671f；unlock() \u5fc5\u987b\u5728 finally \u4e2d，\u4e14\u8981\u786e\u8ba4\u662f\u5f53\u524d\u7ebf\u7a0b\u6301\u6709，\u8de8\u7ebf\u7a0b\u91ca\u653e\u4f1a\u5931\u8d25\u3002<\/p>\n\n\u53c2\u6570\u542b\u4e49\u5178\u578b\u53d6\u503c\u5e38\u89c1\u9519\u8bef<\/tr>\n\n\n\n\n\n
waitTime<\/td>\n\u83b7\u53d6\u9501\u6700\u957f\u7b49\u5f85<\/td>\n1~3 \u79d2<\/td>\n\u8bbe\u5f97\u8fc7\u957f\u5bfc\u81f4\u8bf7\u6c42\u7ebf\u7a0b\u5806\u79ef<\/td>\n<\/tr>\n
leaseTime<\/td>\n\u9501\u6301\u6709\u65f6\u95f4<\/td>\n\u4e0d\u4f20\u6216\u660e\u786e\u6309\u4e1a\u52a1\u4e0a\u9650<\/td>\n\u663e\u5f0f\u4f20\u5165\u540e\u770b\u95e8\u72d7\u5931\u6548<\/td>\n<\/tr>\n
watchdog timeout<\/td>\n\u7eed\u671f\u5468\u671f\u57fa\u51c6<\/td>\n\u9ed8\u8ba4 30 \u79d2<\/td>\n\u8bbe\u5f97\u8fc7\u77ed\u5bfc\u81f4\u9891\u7e41\u7eed\u671f\u538b\u529b<\/td>\n<\/tr>\n
unlock \u5224\u65ad<\/td>\n\u662f\u5426\u5f53\u524d\u7ebf\u7a0b\u6301\u6709<\/td>\nisHeldByCurrentThread()<\/td>\n\u8de8\u7ebf\u7a0b\u91ca\u653e\u629b\u5f02\u5e38<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

7. \u5ba2\u6237\u7aef\u5d29\u6e83\u3001GC \u505c\u987f\u4e0e\u4e3b\u4ece\u5207\u6362：\u4e92\u65a5\u4e3a\u4ec0\u4e48\u4f1a\u5931\u6548<\/h3>\n

\u524d\u9762\u6240\u6709\u65b9\u6848\u90fd\u5efa\u7acb\u5728\u201cRedis \u4e00\u76f4\u8bb0\u5f97\u8fd9\u628a\u9501\u3001\u4e1a\u52a1\u7ebf\u7a0b\u4e00\u76f4\u6b63\u5e38\u6267\u884c\u201d\u4e4b\u4e0a\u3002\u4f46\u73b0\u5b9e\u4e2d\u81f3\u5c11\u6709\u4e09\u7c7b\u4e8b\u4ef6\u4f1a\u6253\u7834\u8fd9\u4e2a\u524d\u63d0\u3002<\/p>\n

\u7b2c\u4e00\u7c7b\u662f\u5ba2\u6237\u7aef\u5d29\u6e83\u3002\u8fdb\u7a0b\u62ff\u5230\u9501\u540e\u5b95\u673a，\u770b\u95e8\u72d7\u7ebf\u7a0b\u4e5f\u968f\u4e4b\u6d88\u5931，\u9501\u4f1a\u4e00\u76f4\u4fdd\u7559\u5230\u8fc7\u671f\u3002\u6b64\u65f6\u4e92\u65a5\u662f\u201c\u6682\u65f6\u5b89\u5168\u201d\u7684，\u4ee3\u4ef7\u662f\u5176\u4ed6\u8bf7\u6c42\u8981\u7b49\u5230 TTL \u7ed3\u675f\u3002\u771f\u6b63\u5371\u9669\u7684\u662f\u201c\u8fdb\u7a0b\u6ca1\u6b7b，\u4f46\u7ebf\u7a0b\u88ab\u957f\u65f6\u95f4\u6682\u505c\u201d，\u6bd4\u5982 Full GC \u505c\u987f 40 \u79d2，\u9501\u5728 30 \u79d2\u65f6\u8fc7\u671f，\u53e6\u4e00\u4e2a\u8fdb\u7a0b\u8fdb\u6765\u4e86，\u4e24\u4e2a\u8fdb\u7a0b\u540c\u65f6\u6267\u884c\u4e34\u754c\u533a\u2014\u2014\u9501\u5728 Redis \u91cc\u6d88\u5931\u4e86，\u53ef\u4e1a\u52a1\u7ebf\u7a0b\u8fd8\u4ee5\u4e3a\u81ea\u5df1\u6301\u6709\u9501\u3002<\/p>\n

\u7b2c\u4e8c\u7c7b\u662f\u4e3b\u4ece\u5207\u6362\u3002Redis \u4e3b\u4ece\u590d\u5236\u9ed8\u8ba4\u662f\u5f02\u6b65\u7684：\u4e3b\u8282\u70b9\u5199\u5165\u9501 key \u5e76\u8fd4\u56de OK，\u4f46\u5728\u590d\u5236\u5230\u4ece\u8282\u70b9\u4e4b\u524d\u4e3b\u8282\u70b9\u5b95\u673a，\u54e8\u5175\u628a\u4ece\u8282\u70b9\u63d0\u5347\u4e3a\u65b0\u4e3b，\u65b0\u4e3b\u4e0a\u6ca1\u6709\u8fd9\u628a\u9501，\u53e6\u4e00\u4e2a\u5ba2\u6237\u7aef\u5c31\u80fd\u518d\u6b21\u52a0\u9501\u6210\u529f\u3002\u4e24\u4e2a\u5ba2\u6237\u7aef\u540c\u65f6\u8ba4\u4e3a\u81ea\u5df1\u6301\u6709\u9501，\u4e92\u65a5\u5931\u6548\u3002<\/p>\n

\u7b2c\u4e09\u7c7b\u662f\u65f6\u949f\u4e0e\u8d85\u65f6\u4f9d\u8d56\u3002\u9501\u7684\u6709\u6548\u6027\u4f9d\u8d56 Redis \u670d\u52a1\u5668\u65f6\u95f4\u548c\u672c\u5730\u65f6\u95f4\u4f30\u7b97，\u5982\u679c\u673a\u5668\u65f6\u949f\u88ab\u8c03\u6574，\u6216\u8005\u7f51\u7edc\u5ef6\u8fdf\u5bfc\u81f4\u8bf7\u6c42\u5728\u9501\u8fc7\u671f\u540e\u624d\u5230\u8fbe，\u540c\u6837\u4f1a\u51fa\u73b0\u4e24\u4e2a\u6301\u6709\u8005\u3002<\/p>\n

\u4e3b\u4ece\u5207\u6362\u5bfc\u81f4\u7684\u4e92\u65a5\u5931\u6548：<\/p>\n

\u5ba2\u6237\u7aef A \u4e3b\u8282\u70b9 M \u4ece\u8282\u70b9 S \u5ba2\u6237\u7aef B
\n | \u52a0\u9501\u6210\u529f | | |
\n |——————>| | |
\n |<– OK ————| | |
\n | | \u5f02\u6b65\u590d\u5236\u9501 key | |
\n | |—————–>| |
\n | | (\u672a\u5b8c\u6210\u524d\u5b95\u673a) | |
\n | | X \u5b95\u673a | |
\n | | | \u63d0\u5347\u4e3a\u4e3b |
\n | | |<—————–| \u52a0\u9501\u6210\u529f
\n | \u4ecd\u5728\u6267\u884c\u4e34\u754c\u533a | |—————–>|
\n | | | \u4e24\u4e2a\u6301\u6709\u8005 |<\/p>\n

\u8fd9\u5f20\u56fe\u60f3\u8bf4\u660e\u7684\u662f：\u4e92\u65a5\u5931\u6548\u4e0d\u662f Redis \u547d\u4ee4\u5199\u9519\u4e86，\u800c\u662f\u201c\u9501\u72b6\u6001\u201d\u548c\u201c\u4e1a\u52a1\u6267\u884c\u201d\u4e4b\u95f4\u7684\u539f\u5b50\u6027\u65e0\u6cd5\u9760\u5355\u4e2a Redis \u5b9e\u4f8b\u4fdd\u8bc1\u3002 \u6240\u4ee5\u5982\u679c\u4f60\u8981\u7684\u662f\u4e25\u683c\u7684\u6b63\u786e\u6027，\u5c31\u4e0d\u80fd\u53ea\u770b\u9501，\u8fd8\u8981\u770b\u88ab\u4fdd\u62a4\u7684\u64cd\u4f5c\u672c\u8eab\u662f\u5426\u5177\u5907\u5e42\u7b49\u6216\u9632\u91cd\u80fd\u529b\u3002<\/p>\n

8. Redlock \u4e89\u8bae：\u591a\u8282\u70b9\u52a0\u9501\u80fd\u89e3\u51b3\u4ec0\u4e48，\u4e0d\u80fd\u89e3\u51b3\u4ec0\u4e48<\/h3>\n

\u9488\u5bf9\u4e3b\u4ece\u5207\u6362\u95ee\u9898，Redis \u4f5c\u8005 antirez \u63d0\u51fa\u4e86 Redlock \u7b97\u6cd5：\u51c6\u5907 N \u4e2a\u4e92\u76f8\u72ec\u7acb\u7684 Redis \u4e3b\u8282\u70b9（\u901a\u5e38 5 \u4e2a），\u5ba2\u6237\u7aef\u4f9d\u6b21\u5411\u6bcf\u4e2a\u8282\u70b9\u7528\u76f8\u540c\u7684 key \u548c value \u52a0\u9501，\u5e76\u8bbe\u7f6e\u4e00\u4e2a\u8f83\u77ed\u7684\u8d85\u65f6；\u53ea\u6709\u5728\u591a\u6570\u6d3e\u8282\u70b9\u4e0a\u6210\u529f\u3001\u4e14\u603b\u8017\u65f6\u5c0f\u4e8e\u9501\u6709\u6548\u65f6\u95f4\u65f6，\u624d\u8ba4\u4e3a\u52a0\u9501\u6210\u529f；\u91ca\u653e\u65f6\u5411\u6240\u6709\u8282\u70b9\u53d1\u9001\u5220\u9664\u8bf7\u6c42\u3002<\/p>\n

\u4ece\u8bbe\u8ba1\u610f\u56fe\u770b，Redlock \u60f3\u7528\u201c\u591a\u6570\u6d3e\u201d\u6362\u53d6\u5bf9\u5355\u70b9\u6545\u969c\u548c\u4e3b\u4ece\u5207\u6362\u7684\u5bb9\u5fcd\u5ea6：\u5373\u4f7f\u5c11\u6570\u8282\u70b9\u6545\u969c\u6216\u5207\u6362，\u53ea\u8981\u591a\u6570\u6d3e\u8fd8\u4fdd\u7559\u7740\u9501\u8bb0\u5f55，\u5176\u4ed6\u5ba2\u6237\u7aef\u5c31\u65e0\u6cd5\u51d1\u9f50\u591a\u6570\u6d3e\u3002<\/p>\n

\u4f46\u5206\u5e03\u5f0f\u7cfb\u7edf\u7814\u7a76\u8005 Martin Kleppmann \u63d0\u51fa\u4e86\u8457\u540d\u8d28\u7591，\u6838\u5fc3\u8bba\u70b9\u6709\u4e09\u6761：\u7b2c\u4e00，Redlock \u4f9d\u8d56\u5404\u8282\u70b9\u65f6\u949f\u5927\u81f4\u540c\u6b65\u548c\u672c\u5730\u65f6\u95f4\u4f30\u7b97，\u8fdb\u7a0b\u6682\u505c（GC\u3001\u865a\u62df\u673a\u8fc1\u79fb）\u4f1a\u8ba9\u9501\u5728\u6709\u6548\u671f\u5185\u5931\u6548；\u7b2c\u4e8c，\u5b83\u6ca1\u6709\u63d0\u4f9b fencing token（\u5355\u8c03\u9012\u589e\u7684\u4ee4\u724c），\u5373\u4f7f\u9501\u5931\u6548，\u88ab\u4fdd\u62a4\u8d44\u6e90\u4e5f\u65e0\u6cd5\u8bc6\u522b\u201c\u6301\u6709\u8005\u662f\u5426\u5df2\u7ecf\u8fc7\u671f\u201d，\u56e0\u6b64\u65e0\u6cd5\u963b\u6b62\u65e7\u6301\u6709\u8005\u7ee7\u7eed\u5199\u5165；\u7b2c\u4e09，\u5bf9\u6548\u7387\u578b\u573a\u666f\u5b83\u592a\u91cd，\u5bf9\u6b63\u786e\u6027\u578b\u573a\u666f\u5b83\u53c8\u4e0d\u591f\u5b89\u5168\u3002antirez \u968f\u540e\u505a\u4e86\u56de\u5e94，\u8ba4\u4e3a\u8fd9\u4e9b\u8d28\u7591\u90e8\u5206\u6210\u7acb\u4f46\u88ab\u5938\u5927，\u53cc\u65b9\u4e89\u8bba\u81f3\u4eca\u6ca1\u6709\u7edf\u4e00\u7ed3\u8bba\u3002<\/p>\n\n\u7ef4\u5ea6\u5355\u5b9e\u4f8b Redis \u9501Redlock\u6570\u636e\u5e93\u884c\u9501 \/ \u552f\u4e00\u7ea6\u675f<\/tr>\n\n\n\n\n\n\n
\u89e3\u51b3\u5355\u70b9\u6545\u969c<\/td>\n\u5426<\/td>\n\u90e8\u5206<\/td>\n\u662f（\u4f9d\u8d56\u6570\u636e\u5e93\u9ad8\u53ef\u7528）<\/td>\n<\/tr>\n
\u5bf9\u65f6\u949f\u4f9d\u8d56<\/td>\n\u4f4e<\/td>\n\u9ad8<\/td>\n\u4f4e<\/td>\n<\/tr>\n
\u9700\u8981 fencing token<\/td>\n\u5efa\u8bae<\/td>\n\u5efa\u8bae\u4e14\u66f4\u5fc5\u8981<\/td>\n\u5929\u7136\u53ef\u7528\u7248\u672c\u53f7<\/td>\n<\/tr>\n
\u6027\u80fd<\/td>\n\u9ad8<\/td>\n\u4e2d<\/td>\n\u4f4e<\/td>\n<\/tr>\n
\u9002\u5408\u573a\u666f<\/td>\n\u6548\u7387\u578b\u4e92\u65a5<\/td>\n\u60f3\u964d\u4f4e\u5355\u70b9\u6982\u7387<\/td>\n\u5f3a\u4e00\u81f4\u6b63\u786e\u6027<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u7ed3\u8bba\u8981\u5206\u573a\u666f：\u5982\u679c\u53ea\u662f\u4e3a\u4e86\u907f\u514d\u91cd\u590d\u6267\u884c\u3001\u51cf\u5c11\u8d44\u6e90\u6d6a\u8d39（\u4f8b\u5982\u591a\u4e2a\u5b9e\u4f8b\u540c\u65f6\u5237\u65b0\u540c\u4e00\u4efd\u7f13\u5b58），\u5355\u5b9e\u4f8b\u9501\u52a0\u5408\u7406\u8fc7\u671f\u65f6\u95f4\u901a\u5e38\u8db3\u591f；\u5982\u679c\u88ab\u4fdd\u62a4\u7684\u64cd\u4f5c\u6d89\u53ca\u91d1\u989d\u3001\u5e93\u5b58\u3001\u72b6\u6001\u673a\u6d41\u8f6c，\u9501\u53ea\u662f\u7b2c\u4e00\u5c42\u4fdd\u62a4，\u8fd8\u9700\u8981\u4e1a\u52a1\u4fa7\u5e42\u7b49\u3001\u7248\u672c\u53f7\u6216\u6570\u636e\u5e93\u552f\u4e00\u7ea6\u675f\u515c\u5e95\u3002Redlock \u53ef\u4ee5\u964d\u4f4e\u5355\u70b9\u98ce\u9669，\u4f46\u5b83\u4e0d\u80fd\u628a Redis \u9501\u53d8\u6210\u5f3a\u4e00\u81f4\u7684\u5206\u5e03\u5f0f\u4e92\u65a5\u539f\u8bed\u3002<\/p>\n

9. \u5b8c\u6574\u793a\u4f8b\u4e09：\u7528 fencing token \u515c\u4f4f\u9501\u5931\u6548<\/h3>\n

\u76ee\u6807：\u6f14\u793a\u5373\u4f7f\u9501\u5931\u6548，\u4e5f\u80fd\u901a\u8fc7\u6570\u636e\u5e93\u7248\u672c\u53f7\u963b\u6b62\u65e7\u6301\u6709\u8005\u5199\u5165，\u5373\u4f7f\u7528\u5355\u8c03\u9012\u589e\u4ee4\u724c\u505a\u4fdd\u62a4\u3002<\/p>\n

\u524d\u7f6e\u73af\u5883：MySQL 8.x \u6216 H2 \u5185\u5b58\u5e93，JDK 8+，Spring JDBC\u3002\u4e0b\u9762\u7528 H2 \u7684 SQL \u7ed3\u6784\u8bf4\u660e，\u8db3\u4ee5\u590d\u73b0\u5173\u952e\u903b\u8f91\u3002<\/p>\n

\u8f93\u5165：\u4e00\u6761\u8ba2\u5355\u8bb0\u5f55，\u72b6\u6001\u4ece CREATED \u6d41\u8f6c\u5230 PAID；\u8981\u6c42\u540c\u4e00\u8ba2\u5355\u53ea\u80fd\u88ab\u4e00\u4e2a\u6301\u6709\u65e7\u4ee4\u724c\u7684\u8bf7\u6c42\u63a8\u8fdb\u4e00\u6b21\u3002<\/p>\n

— \u8868\u7ed3\u6784：version \u540c\u65f6\u5145\u5f53 fencing token<\/span>
\nCREATE<\/span> TABLE<\/span> order_state (<\/span>
\n order_id VARCHAR<\/span>(<\/span>64<\/span>)<\/span> PRIMARY<\/span> KEY<\/span>,<\/span>
\n status<\/span> VARCHAR<\/span>(<\/span>32<\/span>)<\/span> NOT<\/span> NULL<\/span>,<\/span>
\n version BIGINT<\/span> NOT<\/span> NULL<\/span>
\n)<\/span>;<\/span><\/p>\n

INSERT<\/span> INTO<\/span> order_state(<\/span>order_id,<\/span> status<\/span>,<\/span> version)<\/span>
\nVALUES<\/span> (<\/span>'ORD-1001'<\/span>,<\/span> 'CREATED'<\/span>,<\/span> 1<\/span>)<\/span>;<\/span><\/p>\n

import<\/span> java.<\/span>sql.<\/span><\/span>Connection<\/span><\/span>;<\/span>
\nimport<\/span> java.<\/span>sql.<\/span><\/span>PreparedStatement<\/span><\/span>;<\/span>
\nimport<\/span> java.<\/span>sql.<\/span><\/span>ResultSet<\/span><\/span>;<\/span><\/p>\n

public<\/span> class<\/span> FencingTokenDemo<\/span> {<\/span><\/p>\n

\/** \u6a21\u62df\u4e00\u6b21\u5e26\u4ee4\u724c\u7684\u72b6\u6001\u63a8\u8fdb *\/<\/span>
\n public<\/span> boolean<\/span> pay<\/span>(<\/span>Connection<\/span> conn,<\/span> String<\/span> orderId,<\/span> long<\/span> token)<\/span> throws<\/span> Exception<\/span> {<\/span>
\n String<\/span> sql =<\/span> "UPDATE order_state SET status='PAID', version=? "<\/span> +<\/span>
\n "WHERE order_id=? AND status='CREATED' AND version < ?"<\/span>;<\/span>
\n try<\/span> (<\/span>PreparedStatement<\/span> ps =<\/span> conn.<\/span>prepareStatement<\/span>(<\/span>sql)<\/span>)<\/span> {<\/span>
\n ps.<\/span>setLong<\/span>(<\/span>1<\/span>,<\/span> token +<\/span> 1<\/span>)<\/span>;<\/span>
\n ps.<\/span>setString<\/span>(<\/span>2<\/span>,<\/span> orderId)<\/span>;<\/span>
\n ps.<\/span>setLong<\/span>(<\/span>3<\/span>,<\/span> token)<\/span>;<\/span>
\n int<\/span> rows =<\/span> ps.<\/span>executeUpdate<\/span>(<\/span>)<\/span>;<\/span>
\n return<\/span> rows ==<\/span> 1<\/span>;<\/span>
\n }<\/span>
\n }<\/span><\/p>\n

public<\/span> long<\/span> nextToken<\/span>(<\/span>Connection<\/span> conn,<\/span> String<\/span> key)<\/span> throws<\/span> Exception<\/span> {<\/span>
\n String<\/span> sql =<\/span> "UPDATE fence_token SET current = current + 1 WHERE key_name = ?"<\/span>;<\/span>
\n try<\/span> (<\/span>PreparedStatement<\/span> ps =<\/span> conn.<\/span>prepareStatement<\/span>(<\/span>sql)<\/span>)<\/span> {<\/span>
\n ps.<\/span>setString<\/span>(<\/span>1<\/span>,<\/span> key)<\/span>;<\/span>
\n ps.<\/span>executeUpdate<\/span>(<\/span>)<\/span>;<\/span>
\n }<\/span>
\n try<\/span> (<\/span>PreparedStatement<\/span> ps =<\/span> conn.<\/span>prepareStatement<\/span>(<\/span>
\n "SELECT current FROM fence_token WHERE key_name = ?"<\/span>)<\/span>)<\/span> {<\/span>
\n ps.<\/span>setString<\/span>(<\/span>1<\/span>,<\/span> key)<\/span>;<\/span>
\n try<\/span> (<\/span>ResultSet<\/span> rs =<\/span> ps.<\/span>executeQuery<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
\n rs.<\/span>next<\/span>(<\/span>)<\/span>;<\/span>
\n return<\/span> rs.<\/span>getLong<\/span>(<\/span>1<\/span>)<\/span>;<\/span>
\n }<\/span>
\n }<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

\u5173\u952e\u6b65\u9aa4：\u52a0\u9501\u6210\u529f\u540e，\u5148\u4ece\u6570\u636e\u5e93\u6216\u72ec\u7acb\u53d1\u53f7\u5668\u53d6\u4e00\u4e2a\u5355\u8c03\u9012\u589e\u7684\u4ee4\u724c token；\u628a\u5b83\u5e26\u8fdb\u4e1a\u52a1\u64cd\u4f5c；\u5199\u6570\u636e\u65f6\u7528 version < token \u4f5c\u4e3a\u6761\u4ef6，\u65e7\u4ee4\u724c\u7684\u8bf7\u6c42\u5373\u4f7f\u9501\u5df2\u7ecf\u5931\u6548，\u4e5f\u4f1a\u56e0\u7248\u672c\u53f7\u4e0d\u6ee1\u8db3\u800c\u66f4\u65b0 0 \u884c，\u4ece\u800c\u88ab\u62d2\u7edd\u3002<\/p>\n

\u9884\u671f\u7ed3\u679c：\u65e7\u6301\u6709\u8005 A \u7528 token=5 \u63d0\u4ea4\u65f6，\u5982\u679c\u65b0\u6301\u6709\u8005 B \u5df2\u7ecf\u7528 token=6 \u6539\u6210 PAID，A \u7684\u66f4\u65b0\u5f71\u54cd\u884c\u6570\u4e3a 0，\u8fd4\u56de\u5931\u8d25；\u4e1a\u52a1\u4e0d\u4f1a\u51fa\u73b0\u201c\u4e24\u4e2a\u8fdb\u7a0b\u90fd\u6210\u529f\u72b6\u6001\u6d41\u8f6c\u201d\u7684\u60c5\u51b5\u3002<\/p>\n

\u9002\u7528\u573a\u666f：\u91d1\u989d\u3001\u5e93\u5b58\u3001\u8ba2\u5355\u72b6\u6001\u673a\u7b49\u5bf9\u6b63\u786e\u6027\u8981\u6c42\u9ad8\u7684\u573a\u666f\u3002\u5bb9\u6613\u6539\u9519\u7684\u5730\u65b9：\u4ee4\u724c\u5fc5\u987b\u5355\u8c03\u9012\u589e\u4e14\u5168\u5c40\u552f\u4e00，\u4e0d\u80fd\u7528\u968f\u673a\u6570；version < \u4e0e\u4e1a\u52a1\u72b6\u6001\u6761\u4ef6\u8981\u4e00\u8d77\u4f7f\u7528，\u5426\u5219\u53ef\u80fd\u628a\u5df2\u652f\u4ed8\u8ba2\u5355\u91cd\u65b0\u6539\u56de\u5df2\u652f\u4ed8；\u6570\u636e\u5e93\u8fde\u63a5\u548c\u4e8b\u52a1\u8fb9\u754c\u8981\u663e\u5f0f\u7ba1\u7406，\u793a\u4f8b\u4e2d\u7701\u7565\u4e86\u56de\u6eda\u903b\u8f91\u4ee5\u4fbf\u805a\u7126\u4ee4\u724c\u5224\u65ad\u3002<\/p>\n

10. \u5e38\u89c1\u8bef\u533a：\u628a\u9501\u5f53\u6210\u4e07\u80fd\u4fdd\u62a4\u4f1e<\/h3>\n

\u8bef\u533a\u4e00：\u8ba4\u4e3a\u9501\u7684\u8fc7\u671f\u65f6\u95f4\u8d8a\u957f\u8d8a\u5b89\u5168\u3002 \u8fc7\u671f\u65f6\u95f4\u8d8a\u957f，\u8fdb\u7a0b\u5d29\u6e83\u540e\u6062\u590d\u8d8a\u6162；\u771f\u6b63\u5b89\u5168\u7684\u662f\u8ba9\u4e1a\u52a1\u5c3d\u5feb\u5b8c\u6210，\u5e76\u914d\u5408\u5e42\u7b49，\u800c\u4e0d\u662f\u628a TTL \u8bbe\u6210 1 \u5c0f\u65f6\u3002<\/p>\n

\u8bef\u533a\u4e8c：\u8ba4\u4e3a Redlock \u4e00\u5b9a\u6bd4\u5355\u673a\u9501\u6b63\u786e\u3002 Redlock \u964d\u4f4e\u4e86\u5355\u70b9\u6545\u969c\u6982\u7387，\u4f46\u5b83\u5f15\u5165\u66f4\u591a\u7f51\u7edc\u5f80\u8fd4\u548c\u65f6\u949f\u4f9d\u8d56，\u5728\u5ba2\u6237\u7aef\u957f\u65f6\u95f4\u6682\u505c\u65f6\u540c\u6837\u4f1a\u5931\u6548；\u5b83\u4e0d\u662f\u5f3a\u4e00\u81f4\u7684\u7ebf\u6027\u5316\u9501\u3002<\/p>\n

\u8bef\u533a\u4e09：\u8ba4\u4e3a\u770b\u95e8\u72d7\u80fd\u9632\u6b62\u201c\u6b7b\u4eba\u6301\u9501\u201d\u3002 \u770b\u95e8\u72d7\u53ea\u80fd\u7eed\u671f\u6d3b\u7740\u7684\u8fdb\u7a0b；\u8fdb\u7a0b\u5d29\u6e83\u540e\u7eed\u671f\u505c\u6b62，\u9501\u6700\u7ec8\u8fc7\u671f\u3002\u770b\u95e8\u72d7\u89e3\u51b3\u7684\u662f\u201c\u6162\u201d，\u4e0d\u662f\u201c\u6b7b\u201d\u3002<\/p>\n

\u8bef\u533a\u56db：\u7528\u9501\u6765\u4fdd\u8bc1\u6d88\u8d39\u5e42\u7b49\u3002 \u6d88\u606f\u91cd\u590d\u6295\u9012\u53ef\u80fd\u53d1\u751f\u5728\u9501\u4e4b\u5916，\u5148\u628a\u9501\u5220\u4e86\u518d\u5904\u7406，\u6216\u8005\u5904\u7406\u540e\u8fdb\u7a0b\u5d29\u6e83\u4f46\u6d88\u606f\u5df2\u7ecf ack，\u90fd\u4f1a\u7834\u574f\u8bed\u4e49\u3002\u5e42\u7b49\u5e94\u8be5\u7531\u4e1a\u52a1\u4e3b\u952e\u3001\u53bb\u91cd\u8868\u6216\u552f\u4e00\u7ea6\u675f\u4fdd\u8bc1\u3002<\/p>\n

\u8bef\u533a\u4e94：\u9501 key \u6ca1\u6709\u547d\u540d\u7a7a\u95f4\u3002 \u591a\u4e2a\u4e1a\u52a1\u5171\u7528 lock \u8fd9\u79cd\u540d\u5b57，\u4e00\u65e6\u67d0\u5904\u8bef\u5220\u6216\u8bef\u7528，\u5f71\u54cd\u9762\u96be\u4ee5\u6392\u67e5\u3002\u5efa\u8bae\u7528 lock:{\u4e1a\u52a1}:{\u5bf9\u8c61} \u7684\u5f62\u5f0f，\u5e76\u5728\u76d1\u63a7\u91cc\u533a\u5206\u3002<\/p>\n

11. \u751f\u4ea7\u5b9e\u8df5\u5efa\u8bae：\u600e\u4e48\u9009\u3001\u600e\u4e48\u914d\u3001\u600e\u4e48\u89c2\u6d4b<\/h3>\n

\u5148\u5224\u65ad\u7528\u9014\u3002 \u5982\u679c\u662f\u201c\u6548\u7387\u578b\u201d\u76ee\u7684，\u4f8b\u5982\u9632\u6b62\u591a\u4e2a\u5b9e\u4f8b\u540c\u65f6\u505a\u4e00\u6b21\u91cd\u590d\u8ba1\u7b97\u3001\u91cd\u590d\u5237\u65b0\u7f13\u5b58，\u53ef\u4ee5\u7528\u5355\u5b9e\u4f8b\u9501，\u7b49\u5f85\u65f6\u95f4\u77ed，\u8fc7\u671f\u65f6\u95f4\u6309\u4e1a\u52a1 P99 \u5b9a，\u5931\u8d25\u76f4\u63a5\u8df3\u8fc7\u6216\u91cd\u8bd5\u3002\u5982\u679c\u662f\u201c\u6b63\u786e\u6027\u578b\u201d\u76ee\u7684，\u4f8b\u5982\u6263\u6b3e\u3001\u6263\u5e93\u5b58\u3001\u72b6\u6001\u673a\u6d41\u8f6c，\u9501\u53ea\u4f5c\u4e3a\u7b2c\u4e00\u9053\u9632\u7ebf，\u5fc5\u987b\u53e0\u52a0\u6570\u636e\u5e93\u4e50\u89c2\u9501\u3001\u552f\u4e00\u7ea6\u675f\u6216\u5e42\u7b49\u8868\u3002<\/p>\n

\u8fc7\u671f\u65f6\u95f4\u4e0e\u7eed\u671f\u7b56\u7565\u3002 \u4e0d\u8981\u8ba9\u4e1a\u52a1\u6267\u884c\u65f6\u95f4\u63a5\u8fd1 TTL\u3002\u63a8\u8350\u505a\u6cd5\u662f：TTL \u53d6\u4e1a\u52a1 P99 \u7684 2 \u5230 3 \u500d；\u4f7f\u7528\u770b\u95e8\u72d7\u7eed\u671f\u65f6，\u663e\u5f0f\u8bbe\u7f6e lockWatchdogTimeout \u5e76\u76d1\u63a7\u7eed\u671f\u5931\u8d25\u6b21\u6570；\u5982\u679c\u4e1a\u52a1\u6709\u786c\u4e0a\u9650（\u4f8b\u5982 30 \u79d2\u5fc5\u987b\u7ed3\u675f），\u76f4\u63a5\u8bbe leaseTime \u5e76\u8ba9\u8d85\u65f6\u5931\u8d25\u7684\u8bf7\u6c42\u8fdb\u5165\u8865\u507f\u6d41\u7a0b，\u800c\u4e0d\u662f\u65e0\u9650\u7eed\u671f\u3002<\/p>\n

\u91ca\u653e\u9501\u7684\u6b63\u786e\u59ff\u52bf\u3002 \u6c38\u8fdc\u5728 finally \u4e2d\u91ca\u653e，\u5148\u5224\u65ad\u5f53\u524d\u7ebf\u7a0b\u662f\u5426\u6301\u6709；\u4f7f\u7528 Lua \u6bd4\u8f83 value；\u91ca\u653e\u5931\u8d25\u8981\u6253\u65e5\u5fd7\u5e76\u8bb0\u5f55 key \u548c value，\u65b9\u4fbf\u4eba\u5de5\u4ecb\u5165\u3002\u4e0d\u8981\u7528 DEL \u76f4\u63a5\u5220，\u4e5f\u4e0d\u8981\u5728\u89e3\u9501\u811a\u672c\u91cc\u6df7\u5165\u5176\u4ed6\u903b\u8f91\u3002<\/p>\n

\u89c2\u6d4b\u6307\u6807\u3002 \u81f3\u5c11\u91c7\u96c6：\u83b7\u53d6\u9501\u6210\u529f\u7387\u3001\u5e73\u5747\u7b49\u5f85\u65f6\u95f4\u3001\u7b49\u5f85\u8d85\u65f6\u6b21\u6570\u3001TTL \u5269\u4f59\u65f6\u95f4\u5206\u5e03\u3001\u7eed\u671f\u6b21\u6570\u3001\u88ab\u5176\u4ed6\u7ebf\u7a0b\u62a2\u5148\u91ca\u653e\u7684\u6b21\u6570\u3002\u8fd9\u4e9b\u6307\u6807\u80fd\u5e2e\u4f60\u5728\u4e8b\u6545\u4e4b\u524d\u53d1\u73b0\u201c\u9501\u7b49\u5f85\u5806\u79ef\u201d\u3002<\/p>\n\n\u573a\u666f\u63a8\u8350\u65b9\u6848\u8fc7\u671f\/\u7eed\u671f\u5931\u8d25\u5904\u7406<\/tr>\n\n\n\n\n\n
\u7f13\u5b58\u5237\u65b0\u53bb\u91cd<\/td>\n\u5355\u5b9e\u4f8b\u9501<\/td>\nTTL \u77ed，\u53ef\u7eed\u671f<\/td>\n\u8df3\u8fc7\u672c\u6b21<\/td>\n<\/tr>\n
\u5b9a\u65f6\u4efb\u52a1\u5355\u5b9e\u4f8b<\/td>\n\u5355\u5b9e\u4f8b\u9501\u6216 Redisson<\/td>\nTTL \u8986\u76d6\u4efb\u52a1\u4e0a\u9650<\/td>\n\u8bb0\u5f55\u5e76\u544a\u8b66<\/td>\n<\/tr>\n
\u8ba2\u5355\u72b6\u6001\u673a<\/td>\n\u9501 + \u6570\u636e\u5e93\u7248\u672c\u53f7<\/td>\nTTL \u77ed，\u4e0d\u65e0\u9650\u7eed\u671f<\/td>\n\u4e8b\u52a1\u56de\u6eda\u91cd\u8bd5<\/td>\n<\/tr>\n
\u8de8\u673a\u623f\u5f3a\u4e00\u81f4<\/td>\n\u6570\u636e\u5e93\/\u5171\u8bc6\u7ec4\u4ef6<\/td>\n\u4e0d\u9002\u7528<\/td>\n\u4f9d\u8d56\u5e95\u5c42\u4e00\u81f4\u6027<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

12. \u6392\u969c\u6e05\u5355：\u9501\u76f8\u5173\u95ee\u9898\u600e\u4e48\u4e00\u6b65\u6b65\u6536\u655b<\/h3>\n

\u7b2c\u4e00\u6b65，\u786e\u8ba4\u9501 key \u662f\u5426\u5b58\u5728\u3001value \u662f\u4ec0\u4e48\u3001TTL \u8fd8\u5269\u591a\u5c11\u3002 \u4f7f\u7528 GET\u3001PTTL\u3001OBJECT IDLETIME \u67e5\u770b；\u5982\u679c key \u4e0d\u5b58\u5728\u5374\u4ecd\u51fa\u95ee\u9898，\u8bf4\u660e\u9501\u6ca1\u6709\u751f\u6548，\u5148\u68c0\u67e5\u52a0\u9501\u547d\u4ee4\u662f\u5426\u771f\u7684\u7528\u4e86 NX \u548c PX\u3002<\/p>\n

\u7b2c\u4e8c\u6b65，\u786e\u8ba4\u662f\u5426\u53d1\u751f\u8bef\u5220\u3002 \u641c\u7d22\u65e5\u5fd7\u4e2d\u7684\u89e3\u9501\u811a\u672c\u8fd4\u56de\u503c，\u5982\u679c\u9891\u7e41\u8fd4\u56de 0，\u8bf4\u660e\u5f53\u524d\u7ebf\u7a0b\u62ff\u7684 value \u5df2\u4e0d\u662f\u9501\u4e0a\u7684\u503c，\u901a\u5e38\u610f\u5473\u7740\u9501\u5df2\u7ecf\u8fc7\u671f\u5e76\u88ab\u522b\u4eba\u83b7\u53d6\u3002<\/p>\n

\u7b2c\u4e09\u6b65，\u786e\u8ba4\u4e1a\u52a1\u6267\u884c\u65f6\u95f4\u5206\u5e03\u3002 \u628a\u4e1a\u52a1\u8017\u65f6\u548c\u9501 TTL \u753b\u5728\u540c\u4e00\u5f20\u56fe\u4e0a，\u770b P99 \u662f\u5426\u903c\u8fd1 TTL\u3002\u5982\u679c\u63a5\u8fd1，\u5148\u6392\u67e5\u6162 SQL\u3001GC\u3001\u5916\u90e8 RPC \u8d85\u65f6，\u518d\u8003\u8651\u7eed\u671f\u3002<\/p>\n

\u7b2c\u56db\u6b65，\u786e\u8ba4 Redis \u62d3\u6251\u662f\u5426\u53d1\u751f\u8fc7\u5207\u6362\u3002 \u67e5\u770b\u54e8\u5175\u65e5\u5fd7\u3001\u4e3b\u4ece\u5207\u6362\u4e8b\u4ef6\u3001INFO replication \u7684 master_link_status；\u5982\u679c\u5207\u6362\u671f\u95f4\u51fa\u73b0\u53cc\u5199，\u7ed3\u5408\u4e1a\u52a1\u4fa7\u7248\u672c\u53f7\u5224\u65ad\u662f\u5426\u771f\u7684\u9020\u6210\u6570\u636e\u9519\u8bef\u3002<\/p>\n

\u7b2c\u4e94\u6b65，\u786e\u8ba4\u5ba2\u6237\u7aef\u6682\u505c\u3002 \u67e5\u770b GC \u65e5\u5fd7\u4e2d\u7684 Full GC \u505c\u987f；\u5982\u679c\u505c\u987f\u65f6\u95f4\u8d85\u8fc7\u9501 TTL，\u5373\u4fbf Redis \u4e00\u5207\u6b63\u5e38，\u4e92\u65a5\u4e5f\u4f1a\u5931\u6548\u3002<\/p>\n

# \u6392\u969c\u5e38\u7528\u547d\u4ee4<\/span>
\nredis-cli GET lock:order:ORD-1001
\nredis-cli PTTL lock:order:ORD-1001
\nredis-cli INFO replication
\nredis-cli SLOWLOG GET 10<\/span><\/p>\n

13. \u9762\u8bd5\u4e0e\u590d\u76d8\u95ee\u9898<\/h3>\n
  • \u4e3a\u4ec0\u4e48 SETNX + EXPIRE \u4e24\u6761\u547d\u4ee4\u4e0d\u5b89\u5168？\u5982\u679c\u6539\u6210 SET NX PX \u8fd8\u5269\u4e0b\u54ea\u4e9b\u95ee\u9898？<\/li>\n
  • \u91ca\u653e\u9501\u4e3a\u4ec0\u4e48\u5fc5\u987b\u7528 Lua？\u5982\u679c\u4e0d\u7528 Lua，\u4ec0\u4e48\u65f6\u5e8f\u4f1a\u5bfc\u81f4\u8bef\u5220\u522b\u4eba\u7684\u9501？<\/li>\n
  • \u770b\u95e8\u72d7\u5728\u4ec0\u4e48\u6761\u4ef6\u4e0b\u751f\u6548，\u4ec0\u4e48\u6761\u4ef6\u4e0b\u4e0d\u4f1a\u7eed\u671f？\u8fdb\u7a0b\u5d29\u6e83\u540e\u9501\u591a\u4e45\u91ca\u653e？<\/li>\n
  • Redlock \u60f3\u89e3\u51b3\u4ec0\u4e48\u95ee\u9898？\u5b83\u5728\u5ba2\u6237\u7aef\u957f\u65f6\u95f4\u6682\u505c\u548c\u65f6\u949f\u6f02\u79fb\u4e0b\u7684\u8fb9\u754c\u5728\u54ea\u91cc？<\/li>\n
  • fencing token \u4e3a\u4ec0\u4e48\u80fd\u515c\u4f4f\u9501\u5931\u6548？\u5b83\u8981\u6c42\u4ee4\u724c\u5177\u5907\u4ec0\u4e48\u6027\u8d28？<\/li>\n
  • \u4e00\u4e2a\u5e93\u5b58\u6263\u51cf\u573a\u666f，\u4f60\u4f1a\u600e\u4e48\u7ec4\u5408 Redis \u9501\u3001\u6570\u636e\u5e93\u552f\u4e00\u7ea6\u675f\u548c\u5e42\u7b49\u8868？<\/li>\n

    14. \u603b\u7ed3：\u4e00\u5f20\u51b3\u7b56\u56fe\u6536\u675f\u6240\u6709\u8ba8\u8bba<\/h3>\n

    \u9700\u8981\u8de8\u8fdb\u7a0b\u4e92\u65a5？
    \n |
    \n +– \u5426 –> \u7528 JVM \u5185\u9501\u5373\u53ef
    \n |
    \n +– \u662f –> \u4e1a\u52a1\u5931\u8d25\u4f1a\u4e0d\u4f1a\u9020\u6210\u8d44\u91d1\/\u5e93\u5b58\/\u72b6\u6001\u9519\u8bef？
    \n |
    \n +– \u5426（\u6548\u7387\u578b） –> \u5355\u5b9e\u4f8b Redis \u9501
    \n | – SET NX PX
    \n | – Lua \u91ca\u653e
    \n | – TTL \u6309 P99 \u8bbe\u7f6e
    \n |
    \n +– \u662f（\u6b63\u786e\u6027\u578b） –> Redis \u9501\u53ea\u662f\u7b2c\u4e00\u5c42
    \n – \u52a0 fencing token \/ \u7248\u672c\u53f7
    \n – \u6570\u636e\u5e93\u552f\u4e00\u7ea6\u675f\u515c\u5e95
    \n – \u8bc4\u4f30\u662f\u5426\u76f4\u63a5\u4e0a\u6570\u636e\u5e93\u9501\u6216\u5171\u8bc6\u7ec4\u4ef6
    \n – \u76d1\u63a7 GC\u3001\u4e3b\u4ece\u5207\u6362\u3001\u7f51\u7edc\u5206\u533a<\/p>\n

    \u56de\u5230\u5f00\u5934\u90a3\u4e2a\u8d85\u5356\u95ee\u9898：\u52a0\u4e00\u628a Redis \u9501\u786e\u5b9e\u80fd\u6321\u4f4f\u5927\u90e8\u5206\u5e76\u53d1，\u4f46\u771f\u6b63\u8ba9\u7cfb\u7edf\u4e0d\u518d\u51fa\u9519\u7684，\u662f\u7406\u89e3\u9501\u7684\u8fb9\u754c\u2014\u2014\u5b83\u4f9d\u8d56\u8fc7\u671f\u65f6\u95f4\u3001\u4f9d\u8d56\u5ba2\u6237\u7aef\u4e0d\u957f\u65f6\u95f4\u6682\u505c\u3001\u4f9d\u8d56 Redis \u6545\u969c\u5207\u6362\u65f6\u4e0d\u4e22\u72b6\u6001\u3002\u8fd9\u4e9b\u4f9d\u8d56\u5728\u5f53\u524d\u5b9e\u73b0\u91cc\u5e76\u4e0d\u603b\u80fd\u6ee1\u8db3，\u6240\u4ee5\u6b63\u786e\u7684\u5de5\u7a0b\u59ff\u52bf\u662f：\u7528\u9501\u964d\u4f4e\u51b2\u7a81\u6982\u7387，\u7528\u5e42\u7b49\u548c\u7248\u672c\u53f7\u4fdd\u8bc1\u6700\u7ec8\u6b63\u786e\u6027\u3002 \u5f53\u4f60\u80fd\u6e05\u695a\u8bf4\u51fa\u201c\u8fd9\u628a\u9501\u5931\u6548\u65f6，\u6211\u7684\u4e1a\u52a1\u4f1a\u600e\u6837\u201d，\u4f60\u624d\u7b97\u771f\u6b63\u638c\u63e1\u4e86 Redis \u5206\u5e03\u5f0f\u9501\u3002<\/p>\n

    15. \u53c2\u8003\u8d44\u6599<\/h3>\n
      \n
    • Redis \u5b98\u65b9\u6587\u6863：SET \u547d\u4ee4\u4e0e NX\u3001PX \u9009\u9879\u8bf4\u660e，https:\/\/redis.io\/commands\/set\/<\/li>\n
    • Redis \u5b98\u65b9\u6587\u6863：EVAL \u4e0e\u811a\u672c\u539f\u5b50\u6027，https:\/\/redis.io\/docs\/manual\/programmability\/eval-intro\/<\/li>\n
    • Redis \u5b98\u65b9\u6587\u6863：Replication \u4e0e\u5f02\u6b65\u590d\u5236\u8bed\u4e49，https:\/\/redis.io\/docs\/management\/replication\/<\/li>\n
    • Redisson \u5b98\u65b9\u6587\u6863：Lock \u4e0e watchdog，https:\/\/redisson.org\/docs\/data-and-services\/locks-and-synchronizers\/<\/li>\n
    • Martin Kleppmann：How to do distributed locking，https:\/\/martin.kleppmann.com\/2016\/02\/08\/how-to-do-distributed-locking.html<\/li>\n
    • antirez：Is Redlock safe?，http:\/\/antirez.com\/news\/101<\/li>\n
    • Redis \u5b98\u65b9\u6587\u6863：Redis Cluster \u4e0e Sentinel，https:\/\/redis.io\/docs\/management\/sentinel\/<\/li>\n
    • \u300aRedis \u8bbe\u8ba1\u4e0e\u5b9e\u73b0\u300b\u9ec4\u5065\u5b8f\u8457，\u5173\u4e8e\u5355\u7ebf\u7a0b\u6a21\u578b\u4e0e\u8fc7\u671f\u673a\u5236\u7ae0\u8282<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"

      Redis \u5206\u5e03\u5f0f\u9501\u7684\u8fb9\u754c\u6761\u4ef6：Redlock \u4e89\u8bae\u3001\u9501\u7eed\u671f\u4e0e\u5ba2\u6237\u7aef\u5d29\u6e83\u540e\u7684\u4e92\u65a5\u5931\u6548
      \n1. \u4ece\u4e00\u4e2a\u771f\u5b9e\u7684\u201c\u9501\u6ca1\u751f\u6548\u201d\u95ee\u9898\u8bf4\u8d77
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