{"id":201352,"date":"2025-05-10T09:04:33","date_gmt":"2025-05-10T01:04:33","guid":{"rendered":"https:\/\/server.hk\/cnblog\/201352\/"},"modified":"2025-05-10T09:04:33","modified_gmt":"2025-05-10T01:04:33","slug":"redis%e5%88%86%e5%b8%83%e5%bc%8f%e9%94%81%e4%b9%8b%e7%ba%a2%e9%94%81%e7%9a%84%e5%ae%9e%e7%8e%b0","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/201352\/","title":{"rendered":"Redis\u5206\u5e03\u5f0f\u9501\u4e4b\u7ea2\u9501\u7684\u5b9e\u73b0"},"content":{"rendered":"

<\/b> <\/p>\n

Redis\u5206\u5e03\u5f0f\u9501\u4e4b\u7ea2\u9501\u7684\u5b9e\u73b0<\/h1>\n

<\/i>\u6536\u85cf<\/span> <\/p>\n

\u672c\u7bc7\u6587\u7ae0\u4e3b\u8981\u662f\u7ed3\u5408\u6211\u4e4b\u524d\u9762\u8bd5\u7684\u5404\u79cd\u7ecf\u5386\u548c\u5b9e\u6218\u5f00\u53d1\u4e2d\u9047\u5230\u7684\u95ee\u9898\u89e3\u51b3\u7ecf\u9a8c\u6574\u7406\u7684\uff0c\u5e0c\u671b\u8fd9\u7bc7\u300aRedis\u5206\u5e03\u5f0f\u9501\u4e4b\u7ea2\u9501\u7684\u5b9e\u73b0\u300b\u5bf9\u4f60\u6709\u5f88\u5927\u5e2e\u52a9\uff01\u6b22\u8fce\u6536\u85cf\uff0c\u5206\u4eab\u7ed9\u66f4\u591a\u7684\u9700\u8981\u7684\u670b\u53cb\u5b66\u4e60~<\/p>\n

\u4e00\u3001\u95ee\u9898<\/h2>\n

\u5206\u5e03\u5f0f\u9501\uff0c\u5f53\u6211\u4eec\u8bf7\u6c42\u4e00\u4e2a\u5206\u5e03\u5f0f\u9501\u7684\u65f6\u5019\uff0c\u6210\u529f\u4e86\uff0c\u4f46\u662f\u8fd9\u65f6\u5019slave\u8fd8\u6ca1\u6709\u590d\u5236\u6211\u4eec\u7684\u9501\uff0cmasterDown\u4e86\uff0c\u6211\u4eec\u7684\u5e94\u7528\u7ee7\u7eed\u8bf7\u6c42\u9501\u7684\u65f6\u5019\uff0c\u4f1a\u4ece\u7ee7\u4efb\u4e86master\u7684\u539fslave\u4e0a\u7533\u8bf7\uff0c\u4e5f\u4f1a\u6210\u529f\u3002<\/p>\n

\u8fd9\u5c31\u4f1a\u5bfc\u81f4\uff0c\u540c\u4e00\u4e2a\u9501\u88ab\u83b7\u53d6\u4e86\u4e0d\u6b62\u4e00\u6b21\u3002<\/p>\n

\u4e8c\u3001\u529e\u6cd5<\/h2>\n

Redis\u4e2d\u9488\u5bf9\u6b64\u79cd\u60c5\u51b5\uff0c\u5f15\u5165\u4e86\u7684\u6982\u5ff5\u3002<\/p>\n

\u4e09\u3001\u539f\u7406<\/h2>\n

\u7528Redis\u4e2d\u7684\u591a\u4e2amaster\u5b9e\u4f8b\uff0c\u6765\u83b7\u53d6\u9501\uff0c\u53ea\u6709\u5927\u591a\u6570\u5b9e\u4f8b\u83b7\u53d6\u5230\u4e86\u9501\uff0c\u624d\u7b97\u662f\u83b7\u53d6\u6210\u529f\u3002\u5177\u4f53\u7684\u7ea2\u9501\u7b97\u6cd5\u5206\u4e3a\u4ee5\u4e0b\u4e94\u6b65\uff1a<\/p>\n

    \n
  • \u83b7\u53d6\u5f53\u524d\u7684\u65f6\u95f4\uff08\u5355\u4f4d\u662f\u6beb\u79d2\uff09\u3002<\/li>\n
  • \u4f7f\u7528\u76f8\u540c\u7684key\u548c\u968f\u673a\u503c\u5728N\u4e2a\u8282\u70b9\u4e0a\u8bf7\u6c42\u9501\u3002\u8fd9\u91cc\u83b7\u53d6\u9501\u7684\u5c1d\u8bd5\u65f6\u95f4\u8981\u8fdc\u8fdc\u5c0f\u4e8e\u9501\u7684\u8d85\u65f6\u65f6\u95f4\uff0c\u9632\u6b62\u67d0\u4e2amasterDown\u4e86\uff0c\u6211\u4eec\u8fd8\u5728\u4e0d\u65ad\u7684\u83b7\u53d6\u9501\uff0c\u800c\u88ab\u963b\u585e\u8fc7\u957f\u7684\u65f6\u95f4\u3002<\/li>\n
  • \u53ea\u6709\u5728\u5927\u591a\u6570\u8282\u70b9\u4e0a\u83b7\u53d6\u5230\u4e86\u9501\uff0c\u800c\u4e14\u603b\u7684\u83b7\u53d6\u65f6\u95f4\u5c0f\u4e8e\u9501\u7684\u8d85\u65f6\u65f6\u95f4\u7684\u60c5\u51b5\u4e0b\uff0c\u8ba4\u4e3a\u9501\u83b7\u53d6\u6210\u529f\u4e86\u3002<\/li>\n
  • \u5982\u679c\u9501\u83b7\u53d6\u6210\u529f\u4e86\uff0c\u9501\u7684\u8d85\u65f6\u65f6\u95f4\u5c31\u662f\u6700\u521d\u7684\u9501\u8d85\u65f6\u65f6\u95f4\u8fdb\u53bb\u83b7\u53d6\u9501\u7684\u603b\u8017\u65f6\u65f6\u95f4\u3002<\/li>\n
  • \u5982\u679c\u9501\u83b7\u53d6\u5931\u8d25\u4e86\uff0c\u4e0d\u7ba1\u662f\u56e0\u4e3a\u83b7\u53d6\u6210\u529f\u7684\u8282\u70b9\u7684\u6570\u76ee\u6ca1\u6709\u8fc7\u534a\uff0c\u8fd8\u662f\u56e0\u4e3a\u83b7\u53d6\u9501\u7684\u8017\u65f6\u8d85\u8fc7\u4e86\u9501\u7684\u91ca\u653e\u65f6\u95f4\uff0c\u90fd\u4f1a\u5c06\u5df2\u7ecf\u8bbe\u7f6e\u4e86key\u7684master\u4e0a\u7684key\u5220\u9664\u3002<\/li>\n<\/ul>\n

    \u56db\u3001\u5b9e\u6218<\/h2>\n

    Redission\u5c31\u5b9e\u73b0\u4e86\u7ea2\u9501\u7b97\u6cd5\uff0c\u4f7f\u7528\u7684\u6b65\u9aa4\u5982\u4e0b\uff1a<\/p>\n

    1\u3001\u5f15\u5165maven<\/p>\n

    \n   \n\n   \n    \n     org.redisson\n    \n    \n     redisson\n    \n    \n     3.9.0\n    \n   <\/pre>\n
    2\u3001\u5f15\u5165\u4ee3\u7801<\/p>\n
    Config config1 = new Config();\nconfig1.useSingleServer().setAddress(\"redis:\/\/172.0.0.1:5378\").setPassword(\"a123456\").setDatabase(0);\nRedissonClient redissonClient1 = Redisson.create(config1);\n\nConfig config2 = new Config();\nconfig2.useSingleServer().setAddress(\"redis:\/\/172.0.0.1:5379\").setPassword(\"a123456\").setDatabase(0);\nRedissonClient redissonClient2 = Redisson.create(config2);\n\nConfig config3 = new Config();\nconfig3.useSingleServer().setAddress(\"redis:\/\/172.0.0.1:5380\").setPassword(\"a123456\").setDatabase(0);\nRedissonClient redissonClient3 = Redisson.create(config3);\n\n\/**\n * \u83b7\u53d6\u591a\u4e2a RLock \u5bf9\u8c61\n *\/\nRLock lock1 = redissonClient1.getLock(lockKey);\nRLock lock2 = redissonClient2.getLock(lockKey);\nRLock lock3 = redissonClient3.getLock(lockKey);\n\n\/**\n * \u6839\u636e\u591a\u4e2a RLock \u5bf9\u8c61\u6784\u5efa RedissonRedLock \uff08\u6700\u6838\u5fc3\u7684\u5dee\u522b\u5c31\u5728\u8fd9\u91cc\uff09\n *\/\nRedissonRedLock redLock = new RedissonRedLock(lock1, lock2, lock3);\n\ntry {\n    \/**\n     * 4.\u5c1d\u8bd5\u83b7\u53d6\u9501\n     * waitTimeout \u5c1d\u8bd5\u83b7\u53d6\u9501\u7684\u6700\u5927\u7b49\u5f85\u65f6\u95f4\uff0c\u8d85\u8fc7\u8fd9\u4e2a\u503c\uff0c\u5219\u8ba4\u4e3a\u83b7\u53d6\u9501\u5931\u8d25\n     * leaseTime   \u9501\u7684\u6301\u6709\u65f6\u95f4,\u8d85\u8fc7\u8fd9\u4e2a\u65f6\u95f4\u9501\u4f1a\u81ea\u52a8\u5931\u6548\uff08\u503c\u5e94\u8bbe\u7f6e\u4e3a\u5927\u4e8e\u4e1a\u52a1\u5904\u7406\u7684\u65f6\u95f4\uff0c\u786e\u4fdd\u5728\u9501\u6709\u6548\u671f\u5185\u4e1a\u52a1\u80fd\u5904\u7406\u5b8c\uff09\n     *\/\n    boolean res = redLock.tryLock((long)waitTimeout, (long)leaseTime, TimeUnit.SECONDS);\n    if (res) {\n        \/\/\u6210\u529f\u83b7\u5f97\u9501\uff0c\u5728\u8fd9\u91cc\u5904\u7406\u4e1a\u52a1\n    }\n} catch (Exception e) {\n    throw new RuntimeException(\"aquire lock fail\");\n}finally{\n    \/\/\u65e0\u8bba\u5982\u4f55, \u6700\u540e\u90fd\u8981\u89e3\u9501\n    redLock.unlock();\n}<\/pre>\n
    3\u3001\u6838\u5fc3\u6e90\u7801<\/p>\n
    public boolean tryLock(long waitTime, long leaseTime, TimeUnit unit) throws InterruptedException {\n    long newLeaseTime = -1;\n    if (leaseTime != -1) {\n        newLeaseTime = unit.toMillis(waitTime)*2;\n    }\n    \n    long time = System.currentTimeMillis();\n    long remainTime = -1;\n    if (waitTime != -1) {\n        remainTime = unit.toMillis(waitTime);\n    }\n    long lockWaitTime = calcLockWaitTime(remainTime);\n    \/**\n     * 1. \u5141\u8bb8\u52a0\u9501\u5931\u8d25\u8282\u70b9\u4e2a\u6570\u9650\u5236\uff08N-(N\/2+1)\uff09\n     *\/\n    int failedLocksLimit = failedLocksLimit();\n    \/**\n     * 2. \u904d\u5386\u6240\u6709\u8282\u70b9\u901a\u8fc7EVAL\u547d\u4ee4\u6267\u884clua\u52a0\u9501\n     *\/\n    List\n   \n     acquiredLocks = new ArrayList(locks.size());\n    for (ListIterator\n    \n      iterator = locks.listIterator(); iterator.hasNext();) {         RLock lock = iterator.next();         boolean lockAcquired;         \/**          *  3.\u5bf9\u8282\u70b9\u5c1d\u8bd5\u52a0\u9501          *\/         try {             if (waitTime == -1 && leaseTime == -1) {                 lockAcquired = lock.tryLock();             } else {                 long awaitTime = Math.min(lockWaitTime, remainTime);                 lockAcquired = lock.tryLock(awaitTime, newLeaseTime, TimeUnit.MILLISECONDS);             }         } catch (RedisResponseTimeoutException e) {             \/\/ \u5982\u679c\u629b\u51fa\u8fd9\u7c7b\u5f02\u5e38\uff0c\u4e3a\u4e86\u9632\u6b62\u52a0\u9501\u6210\u529f\uff0c\u4f46\u662f\u54cd\u5e94\u5931\u8d25\uff0c\u9700\u8981\u89e3\u9501\u6240\u6709\u8282\u70b9             unlockInner(Arrays.asList(lock));             lockAcquired = false;         } catch (Exception e) {             \/\/ \u629b\u51fa\u5f02\u5e38\u8868\u793a\u83b7\u53d6\u9501\u5931\u8d25             lockAcquired = false;         }                  if (lockAcquired) {             \/**              *4. \u5982\u679c\u83b7\u53d6\u5230\u9501\u5219\u6dfb\u52a0\u5230\u5df2\u83b7\u53d6\u9501\u96c6\u5408\u4e2d              *\/             acquiredLocks.add(lock);         } else {             \/**              * 5. \u8ba1\u7b97\u5df2\u7ecf\u7533\u8bf7\u9501\u5931\u8d25\u7684\u8282\u70b9\u662f\u5426\u5df2\u7ecf\u5230\u8fbe \u5141\u8bb8\u52a0\u9501\u5931\u8d25\u8282\u70b9\u4e2a\u6570\u9650\u5236 \uff08N-(N\/2+1)\uff09              * \u5982\u679c\u5df2\u7ecf\u5230\u8fbe\uff0c \u5c31\u8ba4\u5b9a\u6700\u7ec8\u7533\u8bf7\u9501\u5931\u8d25\uff0c\u5219\u6ca1\u6709\u5fc5\u8981\u7ee7\u7eed\u4ece\u540e\u9762\u7684\u8282\u70b9\u7533\u8bf7\u4e86              * \u56e0\u4e3a Redlock \u7b97\u6cd5\u8981\u6c42\u81f3\u5c11N\/2+1 \u4e2a\u8282\u70b9\u90fd\u52a0\u9501\u6210\u529f\uff0c\u624d\u7b97\u6700\u7ec8\u7684\u9501\u7533\u8bf7\u6210\u529f              *\/             if (locks.size() - acquiredLocks.size() == failedLocksLimit()) {                 break;             }             if (failedLocksLimit == 0) {                 unlockInner(acquiredLocks);                 if (waitTime == -1 && leaseTime == -1) {                     return false;                 }                 failedLocksLimit = failedLocksLimit();                 acquiredLocks.clear();                 \/\/ reset iterator                 while (iterator.hasPrevious()) {                     iterator.previous();                 }             } else {                 failedLocksLimit--;             }         }         \/**          * 6.\u8ba1\u7b97 \u76ee\u524d\u4ece\u5404\u4e2a\u8282\u70b9\u83b7\u53d6\u9501\u5df2\u7ecf\u6d88\u8017\u7684\u603b\u65f6\u95f4\uff0c\u5982\u679c\u5df2\u7ecf\u7b49\u4e8e\u6700\u5927\u7b49\u5f85\u65f6\u95f4\uff0c\u5219\u8ba4\u5b9a\u6700\u7ec8\u7533\u8bf7\u9501\u5931\u8d25\uff0c\u8fd4\u56defalse          *\/         if (remainTime != -1) {             remainTime -= System.currentTimeMillis() - time;             time = System.currentTimeMillis();             if (remainTime > futures = new ArrayList(acquiredLocks.size());         for (RLock rLock : acquiredLocks) {             RFuture\n     \n       future = ((RedissonLock) rLock).expireAsync(unit.toMillis(leaseTime), TimeUnit.MILLISECONDS);             futures.add(future);         }                  for (RFuture\n      \n        rFuture : futures) {             rFuture.syncUninterruptibly();         }     }     \/**      * 7.\u5982\u679c\u903b\u8f91\u6b63\u5e38\u6267\u884c\u5b8c\u5219\u8ba4\u4e3a\u6700\u7ec8\u7533\u8bf7\u9501\u6210\u529f\uff0c\u8fd4\u56detrue      *\/     return true; }\n      \n     \n    \n   <\/pre>\n","protected":false},"excerpt":{"rendered":"
    Redis\u5206\u5e03\u5f0f\u9501\u4e4b\u7ea2\u9501\u7684\u5b9e\u73b0 ...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-201352","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201352","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=201352"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201352\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=201352"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=201352"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=201352"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}