{"id":3376,"date":"2022-06-22T10:10:12","date_gmt":"2022-06-22T02:10:12","guid":{"rendered":"https:\/\/www.zeroheart.xyz\/wordpress\/?p=3376"},"modified":"2022-06-22T10:10:12","modified_gmt":"2022-06-22T02:10:12","slug":"tcc-2","status":"publish","type":"post","link":"https:\/\/www.zeroheart.xyz\/wordpress\/?p=3376","title":{"rendered":"tcc-2"},"content":{"rendered":"\n

\u53c2\u8003\uff1ahttps:\/\/mp.weixin.qq.com\/s\/nM81BRyQRTWab78a6KTD-g<\/a><\/p>\n\n\n\n

1 TCC \u56de\u987e<\/h2>\n\n\n\n

TCC \u6a21\u5f0f\u662f\u6700\u7ecf\u5178\u7684\u5206\u5e03\u5f0f\u4e8b\u52a1\u89e3\u51b3\u65b9\u6848\uff0c\u5b83\u5c06\u5206\u5e03\u5f0f\u4e8b\u52a1\u5206\u4e3a\u4e24\u4e2a\u9636\u6bb5\u6765\u6267\u884c\uff0ctry \u9636\u6bb5\u5bf9\u6bcf\u4e2a\u5206\u652f\u4e8b\u52a1\u8fdb\u884c\u9884\u7559\u8d44\u6e90\uff0c\u5982\u679c\u6240\u6709\u5206\u652f\u4e8b\u52a1\u90fd\u9884\u7559\u8d44\u6e90\u6210\u529f\uff0c\u5219\u8fdb\u5165 commit \u9636\u6bb5\u63d0\u4ea4\u5168\u5c40\u4e8b\u52a1\uff0c\u5982\u679c\u6709\u4e00\u4e2a\u8282\u70b9\u9884\u7559\u8d44\u6e90\u5931\u8d25\u5219\u8fdb\u5165 cancel \u9636\u6bb5\u56de\u6eda\u5168\u5c40\u4e8b\u52a1\u3002<\/p>\n\n\n\n

\u4ee5\u4f20\u7edf\u7684\u8ba2\u5355\u3001\u5e93\u5b58\u3001\u8d26\u6237\u670d\u52a1\u4e3a\u4f8b\uff0c\u5728 try \u9636\u6bb5\u5c1d\u8bd5\u9884\u7559\u8d44\u6e90\uff0c\u63d2\u5165\u8ba2\u5355\u3001\u6263\u51cf\u5e93\u5b58\u3001\u6263\u51cf\u91d1\u989d\uff0c\u8fd9\u4e09\u4e2a\u670d\u52a1\u90fd\u662f\u8981\u63d0\u4ea4\u672c\u5730\u4e8b\u52a1\u7684\uff0c\u8fd9\u91cc\u53ef\u4ee5\u628a\u8d44\u6e90\u8f6c\u5165\u4e2d\u95f4\u8868\u3002\u5728 commit \u9636\u6bb5\uff0c\u518d\u628a try \u9636\u6bb5\u9884\u7559\u7684\u8d44\u6e90\u8f6c\u5165\u6700\u7ec8\u8868\u3002\u800c\u5728 cancel \u9636\u6bb5\uff0c\u628a try \u9636\u6bb5\u9884\u7559\u7684\u8d44\u6e90\u8fdb\u884c\u91ca\u653e\uff0c\u6bd4\u5982\u628a\u8d26\u6237\u91d1\u989d\u8fd4\u56de\u7ed9\u5ba2\u6237\u7684\u8d26\u6237\u3002<\/p>\n\n\n\n

\u6ce8\u610f\uff1atry \u9636\u6bb5\u5fc5\u987b\u662f\u8981\u63d0\u4ea4\u672c\u5730\u4e8b\u52a1\u7684\uff0c\u6bd4\u5982\u6263\u51cf\u8ba2\u5355\u91d1\u989d\uff0c\u5fc5\u987b\u628a\u94b1\u4ece\u5ba2\u6237\u8d26\u6237\u6263\u6389\uff0c\u5982\u679c\u4e0d\u6263\u6389\uff0c\u5728 commit \u9636\u6bb5\u5ba2\u6237\u8d26\u6237\u94b1\u4e0d\u591f\u4e86\uff0c\u5c31\u4f1a\u51fa\u95ee\u9898\u3002<\/mark><\/strong><\/p>\n\n\n\n

2 TCC \u4f18\u52bf<\/h2>\n\n\n\n

TCC \u6a21\u5f0f\u6700\u5927\u7684\u4f18\u52bf\u662f\u6548\u7387\u9ad8\u3002TCC \u6a21\u5f0f\u5728 try \u9636\u6bb5\u7684\u9501\u5b9a\u8d44\u6e90\u5e76\u4e0d\u662f\u771f\u6b63\u610f\u4e49\u4e0a\u7684\u9501\u5b9a\uff0c\u800c\u662f\u771f\u5b9e\u63d0\u4ea4\u4e86\u672c\u5730\u4e8b\u52a1\uff0c\u5c06\u8d44\u6e90\u9884\u7559\u5230\u4e2d\u95f4\u6001\uff0c\u5e76\u4e0d\u9700\u8981\u963b\u585e\u7b49\u5f85\uff0c\u56e0\u6b64\u6548\u7387\u6bd4\u5176\u4ed6\u6a21\u5f0f\u8981\u9ad8\u3002<\/mark><\/p>\n\n\n\n

\u540c\u65f6 TCC \u6a21\u5f0f\u8fd8\u53ef\u4ee5\u8fdb\u884c\u5982\u4e0b\u4f18\u5316\uff1a<\/p>\n\n\n\n

2.1 \u5f02\u6b65\u63d0\u4ea4<\/h3>\n\n\n\n

try \u9636\u6bb5\u6210\u529f\u540e\uff0c\u4e0d\u7acb\u5373\u8fdb\u5165 confirm\/cancel \u9636\u6bb5\uff0c\u800c\u662f\u8ba4\u4e3a\u5168\u5c40\u4e8b\u52a1\u5df2\u7ecf\u7ed3\u675f\u4e86\uff0c\u542f\u52a8\u5b9a\u65f6\u4efb\u52a1\u6765\u5f02\u6b65\u6267\u884c confirm\/cancel\uff0c\u6263\u51cf\u6216\u91ca\u653e\u8d44\u6e90\uff0c\u8fd9\u6837\u4f1a\u6709\u5f88\u5927\u7684\u6027\u80fd\u63d0\u5347\u3002<\/mark><\/p>\n\n\n\n

2.2 \u540c\u5e93\u6a21\u5f0f<\/h3>\n\n\n\n

TCC \u6a21\u5f0f\u4e2d\u6709\u4e09\u4e2a\u89d2\u8272\uff1a<\/p>\n\n\n\n

  • TM\uff1a\u7ba1\u7406\u5168\u5c40\u4e8b\u52a1\uff0c\u5305\u62ec\u5f00\u542f\u5168\u5c40\u4e8b\u52a1\uff0c\u63d0\u4ea4\/\u56de\u6eda\u5168\u5c40\u4e8b\u52a1\uff1b<\/li>
  • RM\uff1a\u7ba1\u7406\u5206\u652f\u4e8b\u52a1\uff1b<\/li>
  • TC: \u7ba1\u7406\u5168\u5c40\u4e8b\u52a1\u548c\u5206\u652f\u4e8b\u52a1\u7684\u72b6\u6001\u3002<\/li><\/ul>\n\n\n\n

    \u4e0b\u56fe\u6765\u81ea Seata \u5b98\u7f51\uff1a<\/p>\n\n\n\n

    \"\"<\/figure>\n\n\n\n

    TM \u5f00\u542f\u5168\u5c40\u4e8b\u52a1\u65f6\uff0cRM \u9700\u8981\u5411 TC \u53d1\u9001\u6ce8\u518c\u6d88\u606f\uff0cTC \u4fdd\u5b58\u5206\u652f\u4e8b\u52a1\u7684\u72b6\u6001\u3002TM \u8bf7\u6c42\u63d0\u4ea4\u6216\u56de\u6eda\u65f6\uff0cTC \u9700\u8981\u5411 RM \u53d1\u9001\u63d0\u4ea4\u6216\u56de\u6eda\u6d88\u606f\u3002\u8fd9\u6837\u5305\u542b\u4e24\u4e2a\u4e2a\u5206\u652f\u4e8b\u52a1\u7684\u5206\u5e03\u5f0f\u4e8b\u52a1\u4e2d\uff0cTC \u548c RM \u4e4b\u95f4\u6709\u56db\u6b21 RPC\u3002<\/p>\n\n\n\n

    \u4f18\u5316\u540e\u7684\u6d41\u7a0b\u5982\u4e0b\u56fe\uff1a<\/p>\n\n\n\n

    \"\"<\/figure>\n\n\n\n

    TC \u4fdd\u5b58\u5168\u5c40\u4e8b\u52a1\u7684\u72b6\u6001\u3002TM \u5f00\u542f\u5168\u5c40\u4e8b\u52a1\u65f6\uff0cRM \u4e0d\u518d\u9700\u8981\u5411 TC \u53d1\u9001\u6ce8\u518c\u6d88\u606f\uff0c\u800c\u662f\u628a\u5206\u652f\u4e8b\u52a1\u72b6\u6001\u4fdd\u5b58\u5728\u4e86\u672c\u5730\u3002TM \u5411 TC \u53d1\u9001\u63d0\u4ea4\u6216\u56de\u6eda\u6d88\u606f\u540e\uff0cRM \u5f02\u6b65\u7ebf\u7a0b\u9996\u5148\u67e5\u51fa\u672c\u5730\u4fdd\u5b58\u7684\u672a\u63d0\u4ea4\u5206\u652f\u4e8b\u52a1\uff0c\u7136\u540e\u5411 TC \u53d1\u9001\u6d88\u606f\u83b7\u53d6\uff08\u672c\u5730\u5206\u652f\u4e8b\u52a1\u6240\u5728\u7684\uff09\u5168\u5c40\u4e8b\u52a1\u72b6\u6001\uff0c\u4ee5\u51b3\u5b9a\u662f\u63d0\u4ea4\u8fd8\u662f\u56de\u6eda\u672c\u5730\u4e8b\u52a1\u3002<\/p>\n\n\n\n

    \u8fd9\u6837\u4f18\u5316\u540e\uff0cRPC \u6b21\u6570\u51cf\u5c11<\/mark>\u4e86 50%\uff0c\u6027\u80fd\u5927\u5e45\u63d0\u5347\u3002<\/p>\n\n\n\n

    3 TCC \u5b58\u5728\u95ee\u9898<\/h2>\n\n\n\n

    TCC \u6a21\u5f0f\u4e2d\u5b58\u5728\u7684\u4e09\u5927\u95ee\u9898\u662f\u5e42\u7b49\u3001\u60ac\u6302\u548c\u7a7a\u56de\u6eda\u3002\u5728 Seata1.5.0 \u7248\u672c\u4e2d\uff0c\u589e\u52a0\u4e86\u4e00\u5f20\u4e8b\u52a1\u63a7\u5236\u8868\uff0c\u8868\u540d\u662f tcc_fence_log \u6765\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u3002\u800c\u5728\u4e0a\u4e00\u8282 @TwoPhaseBusinessAction \u6ce8\u89e3\u4e2d\u63d0\u5230\u7684\u5c5e\u6027 useTCCFence \u5c31\u662f\u6765\u6307\u5b9a\u662f\u5426\u5f00\u542f\u8fd9\u4e2a\u673a\u5236\uff0c\u8fd9\u4e2a\u5c5e\u6027\u503c\u9ed8\u8ba4\u662f false\u3002<\/p>\n\n\n\n

    tcc_fence_log \u5efa\u8868\u8bed\u53e5\u5982\u4e0b\uff08MySQL \u8bed\u6cd5\uff09\uff1a<\/p>\n\n\n\n

    CREATE TABLE IF NOT EXISTS `tcc_fence_log`\n(\n    `xid`           VARCHAR(128)  NOT NULL COMMENT 'global id',\n    `branch_id`     BIGINT        NOT NULL COMMENT 'branch id',\n    `action_name`   VARCHAR(64)   NOT NULL COMMENT 'action name',\n    `status`        TINYINT       NOT NULL COMMENT 'status(tried:1;committed:2;rollbacked:3;suspended:4)',\n    `gmt_create`    DATETIME(3)   NOT NULL COMMENT 'create time',\n    `gmt_modified`  DATETIME(3)   NOT NULL COMMENT 'update time',\n    PRIMARY KEY (`xid`, `branch_id`),\n    KEY `idx_gmt_modified` (`gmt_modified`),\n    KEY `idx_status` (`status`)\n) ENGINE = InnoDB\nDEFAULT CHARSET = utf8mb4;<\/pre>\n\n\n\n
    \u5904\u7406\u5e42\u7b49<\/mark><\/p>\n\n\n\n
    \u63d0\u4ea4\u4e8b\u52a1\u65f6\u9996\u5148\u4f1a\u5224\u65ad tcc_fence_log \u8868\u4e2d\u662f\u5426\u5df2\u7ecf\u6709\u8bb0\u5f55\uff0c\u5982\u679c\u6709\u8bb0\u5f55\uff0c\u5219\u5224\u65ad\u4e8b\u52a1\u6267\u884c\u72b6\u6001\u5e76\u8fd4\u56de\u3002\u8fd9\u6837\u5982\u679c\u5224\u65ad\u5230\u4e8b\u52a1\u7684\u72b6\u6001\u5df2\u7ecf\u662f STATUS_COMMITTED\uff0c\u5c31\u4e0d\u4f1a\u518d\u6b21\u63d0\u4ea4\uff0c\u4fdd\u8bc1\u4e86\u5e42\u7b49\u3002\u5982\u679c tcc_fence_log \u8868\u4e2d\u6ca1\u6709\u8bb0\u5f55\uff0c\u5219\u63d2\u5165\u4e00\u6761\u8bb0\u5f55\uff0c\u4f9b\u540e\u9762\u91cd\u8bd5\u65f6\u5224\u65ad\u3002<\/p>\n\n\n\n
    \u5904\u7406\u7a7a\u56de\u6eda<\/mark><\/p>\n\n\n\n
    Seata \u7684\u89e3\u51b3\u65b9\u6848\u662f\u5728 try \u9636\u6bb5 \u5f80\u00a0tcc_fence_log\u00a0 \u8868\u63d2\u5165\u4e00\u6761\u8bb0\u5f55\uff0cstatus \u5b57\u6bb5\u503c\u662f STATUS_TRIED\uff0c\u5728 Rollback \u9636\u6bb5\u5224\u65ad\u8bb0\u5f55\u662f\u5426\u5b58\u5728\uff0c\u5982\u679c\u4e0d\u5b58\u5728\uff0c\u5219\u4e0d\u6267\u884c\u56de\u6eda\u64cd\u4f5c\u3002<\/p>\n\n\n\n
    \u5904\u7406\u60ac\u6302<\/mark><\/p>\n\n\n\n
    \u60ac\u6302\u5c31\u662f\u7531\u4e8e\u7f51\u7edc\u95ee\u9898\uff0c\u5bfc\u81f4\u7684\uff0ctry\u6307\u4ee4\u6ca1\u6709\u6b63\u5e38\u901a\u77e5\u5230rm\uff0c\u5bfc\u81f4\u6267\u884c\u56de\u6eda\uff0c\u540e\u6765try\u63d0\u793a\u9884\u7559\u8d44\u6e90\u6210\u529f\u3002\u9020\u6210\u7684\u8d44\u6e90\u65e0\u6cd5\u6b63\u5e38\u91ca\u653e\u7684\u95ee\u9898\u3002<\/p>\n\n\n\n
    Seata \u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u7684\u65b9\u6cd5\u662f\u6267\u884c Rollback \u65b9\u6cd5\u65f6\u5148\u5224\u65ad tcc_fence_log \u662f\u5426\u5b58\u5728\u5f53\u524d xid \u7684\u8bb0\u5f55\uff0c\u5982\u679c\u6ca1\u6709\u5219\u5411 tcc_fence_log \u8868\u63d2\u5165\u4e00\u6761\u8bb0\u5f55\uff0c\u72b6\u6001\u662f STATUS_SUSPENDED\uff0c\u5e76\u4e14\u4e0d\u518d\u6267\u884c\u56de\u6eda\u64cd\u4f5c\u3002<\/p>\n\n\n\n
    <\/p>\n\n\n\n
    TCC \u6a21\u5f0f\u662f\u5206\u5e03\u5f0f\u4e8b\u52a1\u4f7f\u7528\u6700\u591a\u7684\u6a21\u5f0f\uff0c\u4f46\u662f\u5e42\u7b49\u3001\u60ac\u6302\u548c\u7a7a\u56de\u6eda\u4e00\u76f4\u662f TCC \u6a21\u5f0f\u9700\u8981\u8003\u8651\u7684\u95ee\u9898\uff0cSeata \u6846\u67b6\u5728 1.5.0 \u7248\u672c\u5b8c\u7f8e\u89e3\u51b3\u4e86\u8fd9\u4e9b\u95ee\u9898\u3002<\/p>\n\n\n\n
    \u5bf9 tcc_fence_log \u8868\u7684\u64cd\u4f5c\u4e5f\u9700\u8981\u8003\u8651\u4e8b\u52a1\u7684\u63a7\u5236\uff0cSeata \u4f7f\u7528\u4e86\u4ee3\u7406\u6570\u636e\u6e90\uff0c\u4f7f tcc_fence_log \u8868\u64cd\u4f5c\u548c RM \u4e1a\u52a1\u64cd\u4f5c\u5728\u540c\u4e00\u4e2a\u672c\u5730\u4e8b\u52a1\u4e2d\u6267\u884c\uff0c\u8fd9\u6837\u5c31\u80fd\u4fdd\u8bc1\u672c\u5730\u64cd\u4f5c\u548c\u5bf9 tcc_fence_log \u7684\u64cd\u4f5c\u540c\u65f6\u6210\u529f\u6216\u5931\u8d25\u3002<\/p>\n\n\n\n
    <\/p>\n","protected":false},"excerpt":{"rendered":"
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