{"id":5070,"date":"2021-02-09T15:29:17","date_gmt":"2021-02-09T07:29:17","guid":{"rendered":"https:\/\/damogame.cn\/wordpress\/?p=5070"},"modified":"2021-02-09T15:29:17","modified_gmt":"2021-02-09T07:29:17","slug":"%e5%88%86%e5%b8%83%e5%bc%8f%e4%ba%8b%e5%8a%a1%ef%bc%9asaga%e6%a8%a1%e5%bc%8f","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/5070","title":{"rendered":"\u5206\u5e03\u5f0f\u4e8b\u52a1\uff1aSaga\u6a21\u5f0f"},"content":{"rendered":"<div class=\"rEsl9f\">\n<div class=\"_2mYfmT\">\n<div>\n<div class=\"s-dsoj\"><a href=\"https:\/\/www.jianshu.com\/p\/e4b662407c66?from=timeline&amp;isappinstalled=0\">\u539f\u6587\u5730\u5740<\/a><\/div>\n<div><\/div>\n<\/div>\n<\/div>\n<\/div>\n<article class=\"_2rhmJa\">\n<h2>1 Saga\u76f8\u5173\u6982\u5ff5<\/h2>\n<p>1987\u5e74\u666e\u6797\u65af\u987f\u5927\u5b66\u7684Hector Garcia-Molina\u548cKenneth Salem\u53d1\u8868\u4e86\u4e00\u7bc7Paper Sagas\uff0c\u8bb2\u8ff0\u7684\u662f\u5982\u4f55\u5904\u7406long lived transaction\uff08\u957f\u6d3b\u4e8b\u52a1\uff09\u3002Saga\u662f\u4e00\u4e2a\u957f\u6d3b\u4e8b\u52a1\u53ef\u88ab\u5206\u89e3\u6210\u53ef\u4ee5\u4ea4\u9519\u8fd0\u884c\u7684\u5b50\u4e8b\u52a1\u96c6\u5408\u3002\u5176\u4e2d\u6bcf\u4e2a\u5b50\u4e8b\u52a1\u90fd\u662f\u4e00\u4e2a\u4fdd\u6301\u6570\u636e\u5e93\u4e00\u81f4\u6027\u7684\u771f\u5b9e\u4e8b\u52a1\u3002<br \/>\n\u8bba\u6587\u5730\u5740\uff1a<a href=\"https:\/\/www.cs.cornell.edu\/andru\/cs711\/2002fa\/reading\/sagas.pdf\" target=\"_blank\" rel=\"nofollow noopener\">sagas<\/a><\/p>\n<h3>1.1 Saga\u7684\u7ec4\u6210<\/h3>\n<ul>\n<li>\u6bcf\u4e2aSaga\u7531\u4e00\u7cfb\u5217sub-transaction T<sub>i<\/sub>\u00a0\u7ec4\u6210<\/li>\n<li>\u6bcf\u4e2aT<sub>i<\/sub>\u00a0\u90fd\u6709\u5bf9\u5e94\u7684\u8865\u507f\u52a8\u4f5cC<sub>i<\/sub>\uff0c\u8865\u507f\u52a8\u4f5c\u7528\u4e8e\u64a4\u9500T<sub>i<\/sub>\u9020\u6210\u7684\u7ed3\u679c<\/li>\n<\/ul>\n<p>\u53ef\u4ee5\u770b\u5230\uff0c\u548cTCC\u76f8\u6bd4\uff0cSaga\u6ca1\u6709\u201c\u9884\u7559\u201d\u52a8\u4f5c\uff0c\u5b83\u7684T<sub>i<\/sub>\u5c31\u662f\u76f4\u63a5\u63d0\u4ea4\u5230\u5e93\u3002<\/p>\n<p><strong>Saga\u7684\u6267\u884c\u987a\u5e8f\u6709\u4e24\u79cd\uff1a<\/strong><\/p>\n<ul>\n<li>T<sub>1<\/sub>, T<sub>2<\/sub>, T<sub>3<\/sub>, &#8230;, T<sub>n<\/sub><\/li>\n<li>T<sub>1<\/sub>, T<sub>2<\/sub>, &#8230;, T<sub>j<\/sub>, C<sub>j<\/sub>,&#8230;, C<sub>2<\/sub>, C<sub>1<\/sub>\uff0c\u5176\u4e2d0 &lt; j &lt; n<\/li>\n<\/ul>\n<p><strong>Saga\u5b9a\u4e49\u4e86\u4e24\u79cd\u6062\u590d\u7b56\u7565\uff1a<\/strong><\/p>\n<ul>\n<li>backward recovery\uff0c\u5411\u540e\u6062\u590d\uff0c\u8865\u507f\u6240\u6709\u5df2\u5b8c\u6210\u7684\u4e8b\u52a1\uff0c\u5982\u679c\u4efb\u4e00\u5b50\u4e8b\u52a1\u5931\u8d25\u3002\u5373\u4e0a\u9762\u63d0\u5230\u7684\u7b2c\u4e8c\u79cd\u6267\u884c\u987a\u5e8f\uff0c\u5176\u4e2dj\u662f\u53d1\u751f\u9519\u8bef\u7684sub-transaction\uff0c\u8fd9\u79cd\u505a\u6cd5\u7684\u6548\u679c\u662f\u64a4\u9500\u6389\u4e4b\u524d\u6240\u6709\u6210\u529f\u7684sub-transation\uff0c\u4f7f\u5f97\u6574\u4e2aSaga\u7684\u6267\u884c\u7ed3\u679c\u64a4\u9500\u3002<\/li>\n<li>forward recovery\uff0c\u5411\u524d\u6062\u590d\uff0c\u91cd\u8bd5\u5931\u8d25\u7684\u4e8b\u52a1\uff0c\u5047\u8bbe\u6bcf\u4e2a\u5b50\u4e8b\u52a1\u6700\u7ec8\u90fd\u4f1a\u6210\u529f\u3002\u9002\u7528\u4e8e\u5fc5\u987b\u8981\u6210\u529f\u7684\u573a\u666f\uff0c\u6267\u884c\u987a\u5e8f\u662f\u7c7b\u4f3c\u4e8e\u8fd9\u6837\u7684\uff1aT<sub>1<\/sub>, T<sub>2<\/sub>, &#8230;, T<sub>j<\/sub>(\u5931\u8d25), T<sub>j<\/sub>(\u91cd\u8bd5),&#8230;, T<sub>n<\/sub>\uff0c\u5176\u4e2dj\u662f\u53d1\u751f\u9519\u8bef\u7684sub-transaction\u3002\u8be5\u60c5\u51b5\u4e0b\u4e0d\u9700\u8981C<sub>i<\/sub>\u3002<\/li>\n<\/ul>\n<p>\u663e\u7136\uff0c\u5411\u524d\u6062\u590d\u6ca1\u6709\u5fc5\u8981\u63d0\u4f9b\u8865\u507f\u4e8b\u52a1\uff0c\u5982\u679c\u4f60\u7684\u4e1a\u52a1\u4e2d\uff0c\u5b50\u4e8b\u52a1\uff08\u6700\u7ec8\uff09\u603b\u4f1a\u6210\u529f\uff0c\u6216\u8865\u507f\u4e8b\u52a1\u96be\u4ee5\u5b9a\u4e49\u6216\u4e0d\u53ef\u80fd\uff0c\u5411\u524d\u6062\u590d\u66f4\u7b26\u5408\u4f60\u7684\u9700\u6c42\u3002<\/p>\n<p>\u7406\u8bba\u4e0a\u8865\u507f\u4e8b\u52a1\u6c38\u4e0d\u5931\u8d25\uff0c\u7136\u800c\uff0c\u5728\u5206\u5e03\u5f0f\u4e16\u754c\u4e2d\uff0c\u670d\u52a1\u5668\u53ef\u80fd\u4f1a\u5b95\u673a\uff0c\u7f51\u7edc\u53ef\u80fd\u4f1a\u5931\u8d25\uff0c\u751a\u81f3\u6570\u636e\u4e2d\u5fc3\u4e5f\u53ef\u80fd\u4f1a\u505c\u7535\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\u6211\u4eec\u80fd\u505a\u4e9b\u4ec0\u4e48\uff1f \u6700\u540e\u7684\u624b\u6bb5\u662f\u63d0\u4f9b\u56de\u9000\u63aa\u65bd\uff0c\u6bd4\u5982\u4eba\u5de5\u5e72\u9884\u3002<\/p>\n<h3>1.2 Saga\u7684\u4f7f\u7528\u6761\u4ef6<\/h3>\n<p>Saga\u770b\u8d77\u6765\u5f88\u6709\u5e0c\u671b\u6ee1\u8db3\u6211\u4eec\u7684\u9700\u6c42\u3002\u6240\u6709\u957f\u6d3b\u4e8b\u52a1\u90fd\u53ef\u4ee5\u8fd9\u6837\u505a\u5417\uff1f\u8fd9\u91cc\u6709\u4e00\u4e9b\u9650\u5236\uff1a<\/p>\n<ol>\n<li>Saga\u53ea\u5141\u8bb8<strong>\u4e24\u4e2a\u5c42\u6b21\u7684\u5d4c\u5957<\/strong>\uff0c\u9876\u7ea7\u7684Saga\u548c\u7b80\u5355\u5b50\u4e8b\u52a1<\/li>\n<li>\u5728\u5916\u5c42\uff0c\u5168\u539f\u5b50\u6027\u4e0d\u80fd\u5f97\u5230\u6ee1\u8db3\u3002\u4e5f\u5c31\u662f\u8bf4\uff0csagas\u53ef\u80fd\u4f1a\u770b\u5230\u5176\u4ed6sagas\u7684\u90e8\u5206\u7ed3\u679c<\/li>\n<li>\u6bcf\u4e2a\u5b50\u4e8b\u52a1\u5e94\u8be5\u662f\u72ec\u7acb\u7684\u539f\u5b50\u884c\u4e3a<\/li>\n<li>\u5728\u6211\u4eec\u7684\u4e1a\u52a1\u573a\u666f\u4e0b\uff0c\u5404\u4e2a\u4e1a\u52a1\u73af\u5883\uff08\u5982\uff1a\u822a\u73ed\u9884\u8ba2\u3001\u79df\u8f66\u3001\u9152\u5e97\u9884\u8ba2\u548c\u4ed8\u6b3e\uff09\u662f\u81ea\u7136\u72ec\u7acb\u7684\u884c\u4e3a\uff0c\u800c\u4e14\u6bcf\u4e2a\u4e8b\u52a1\u90fd\u53ef\u4ee5\u7528\u5bf9\u5e94\u670d\u52a1\u7684\u6570\u636e\u5e93\u4fdd\u8bc1\u539f\u5b50\u64cd\u4f5c\u3002<\/li>\n<\/ol>\n<p>\u8865\u507f\u4e5f\u6709\u9700\u8003\u8651\u7684\u4e8b\u9879\uff1a<\/p>\n<ul>\n<li>\u8865\u507f\u4e8b\u52a1\u4ece\u8bed\u4e49\u89d2\u5ea6\u64a4\u6d88\u4e86\u4e8b\u52a1T<sub>i<\/sub>\u7684\u884c\u4e3a\uff0c\u4f46\u672a\u5fc5\u80fd\u5c06\u6570\u636e\u5e93\u8fd4\u56de\u5230\u6267\u884cT<sub>i<\/sub>\u65f6\u7684\u72b6\u6001\u3002\uff08\u4f8b\u5982\uff0c\u5982\u679c\u4e8b\u52a1\u89e6\u53d1\u5bfc\u5f39\u53d1\u5c04\uff0c \u5219\u53ef\u80fd\u65e0\u6cd5\u64a4\u6d88\u6b64\u64cd\u4f5c\uff09<\/li>\n<\/ul>\n<p>\u4f46\u8fd9\u5bf9\u6211\u4eec\u7684\u4e1a\u52a1\u6765\u8bf4\u4e0d\u662f\u95ee\u9898\u3002\u5176\u5b9e\u96be\u4ee5\u64a4\u6d88\u7684\u884c\u4e3a\u4e5f\u6709\u53ef\u80fd\u88ab\u8865\u507f\u3002\u4f8b\u5982\uff0c\u53d1\u9001\u7535\u90ae\u7684\u4e8b\u52a1\u53ef\u4ee5\u901a\u8fc7\u53d1\u9001\u89e3\u91ca\u95ee\u9898\u7684\u53e6\u4e00\u5c01\u7535\u90ae\u6765\u8865\u507f\u3002<\/p>\n<p><strong>\u5bf9\u4e8eACID\u7684\u4fdd\u8bc1\uff1a<\/strong><\/p>\n<p>Saga\u5bf9\u4e8eACID\u7684\u4fdd\u8bc1\u548cTCC\u4e00\u6837\uff1a<\/p>\n<ul>\n<li>\u539f\u5b50\u6027\uff08Atomicity\uff09\uff1a\u6b63\u5e38\u60c5\u51b5\u4e0b\u4fdd\u8bc1\u3002<\/li>\n<li>\u4e00\u81f4\u6027\uff08Consistency\uff09\uff0c\u5728\u67d0\u4e2a\u65f6\u95f4\u70b9\uff0c\u4f1a\u51fa\u73b0A\u5e93\u548cB\u5e93\u7684\u6570\u636e\u8fdd\u53cd\u4e00\u81f4\u6027\u8981\u6c42\u7684\u60c5\u51b5\uff0c\u4f46\u662f\u6700\u7ec8\u662f\u4e00\u81f4\u7684\u3002<\/li>\n<li>\u9694\u79bb\u6027\uff08Isolation\uff09\uff0c\u5728\u67d0\u4e2a\u65f6\u95f4\u70b9\uff0cA\u4e8b\u52a1\u80fd\u591f\u8bfb\u5230B\u4e8b\u52a1\u90e8\u5206\u63d0\u4ea4\u7684\u7ed3\u679c\u3002<\/li>\n<li>\u6301\u4e45\u6027\uff08Durability\uff09\uff0c\u548c\u672c\u5730\u4e8b\u52a1\u4e00\u6837\uff0c\u53ea\u8981commit\u5219\u6570\u636e\u88ab\u6301\u4e45\u3002<\/li>\n<\/ul>\n<p>Saga\u4e0d\u63d0\u4f9bACID\u4fdd\u8bc1\uff0c\u56e0\u4e3a\u539f\u5b50\u6027\u548c\u9694\u79bb\u6027\u4e0d\u80fd\u5f97\u5230\u6ee1\u8db3\u3002\u539f\u8bba\u6587\u63cf\u8ff0\u5982\u4e0b\uff1a<\/p>\n<p><code>full atomicity is not provided. That is, sagas may view the partial results of other sagas<\/code><\/p>\n<p>\u901a\u8fc7saga log\uff0csaga\u53ef\u4ee5\u4fdd\u8bc1\u4e00\u81f4\u6027\u548c\u6301\u4e45\u6027\u3002<\/p>\n<p><strong>\u548cTCC\u5bf9\u6bd4<\/strong><\/p>\n<p>Saga\u76f8\u6bd4TCC\u7684\u7f3a\u70b9\u662f\u7f3a\u5c11\u9884\u7559\u52a8\u4f5c\uff0c\u5bfc\u81f4\u8865\u507f\u52a8\u4f5c\u7684\u5b9e\u73b0\u6bd4\u8f83\u9ebb\u70e6\uff1aT<sub>i<\/sub>\u5c31\u662fcommit\uff0c\u6bd4\u5982\u4e00\u4e2a\u4e1a\u52a1\u662f\u53d1\u9001\u90ae\u4ef6\uff0c\u5728TCC\u6a21\u5f0f\u4e0b\uff0c\u5148\u4fdd\u5b58\u8349\u7a3f\uff08Try\uff09\u518d\u53d1\u9001\uff08Confirm\uff09\uff0c\u64a4\u9500\u7684\u8bdd\u76f4\u63a5\u5220\u9664\u8349\u7a3f\uff08Cancel\uff09\u5c31\u884c\u4e86\u3002\u800cSaga\u5219\u5c31\u76f4\u63a5\u53d1\u9001\u90ae\u4ef6\u4e86\uff08T<sub>i<\/sub>\uff09\uff0c\u5982\u679c\u8981\u64a4\u9500\u5219\u5f97\u518d\u53d1\u9001\u4e00\u4efd\u90ae\u4ef6\u8bf4\u660e\u64a4\u9500\uff08C<sub>i<\/sub>\uff09\uff0c\u5b9e\u73b0\u8d77\u6765\u6709\u4e00\u4e9b\u9ebb\u70e6\u3002<\/p>\n<p>\u5982\u679c\u628a\u4e0a\u9762\u7684\u53d1\u90ae\u4ef6\u7684\u4f8b\u5b50\u6362\u6210\uff1aA\u670d\u52a1\u5728\u5b8c\u6210T<sub>i<\/sub>\u540e\u7acb\u5373\u53d1\u9001Event\u5230ESB\uff08\u4f01\u4e1a\u670d\u52a1\u603b\u7ebf\uff0c\u53ef\u4ee5\u8ba4\u4e3a\u662f\u4e00\u4e2a\u6d88\u606f\u4e2d\u95f4\u4ef6\uff09\uff0c\u4e0b\u6e38\u670d\u52a1\u76d1\u542c\u5230\u8fd9\u4e2aEvent\u505a\u81ea\u5df1\u7684\u4e00\u4e9b\u5de5\u4f5c\u7136\u540e\u518d\u53d1\u9001Event\u5230ESB\uff0c\u5982\u679cA\u670d\u52a1\u6267\u884c\u8865\u507f\u52a8\u4f5cC<sub>i<\/sub>\uff0c\u90a3\u4e48\u6574\u4e2a\u8865\u507f\u52a8\u4f5c\u7684\u5c42\u7ea7\u5c31\u5f88\u6df1\u3002<\/p>\n<p>\u4e0d\u8fc7\u6ca1\u6709\u9884\u7559\u52a8\u4f5c\u4e5f\u53ef\u4ee5\u8ba4\u4e3a\u662f\u4f18\u70b9\uff1a<\/p>\n<ul>\n<li>\u6709\u4e9b\u4e1a\u52a1\u5f88\u7b80\u5355\uff0c\u5957\u7528TCC\u9700\u8981\u4fee\u6539\u539f\u6765\u7684\u4e1a\u52a1\u903b\u8f91\uff0c\u800cSaga\u53ea\u9700\u8981\u6dfb\u52a0\u4e00\u4e2a\u8865\u507f\u52a8\u4f5c\u5c31\u884c\u4e86\u3002<\/li>\n<li>TCC\u6700\u5c11\u901a\u4fe1\u6b21\u6570\u4e3a2n\uff0c\u800cSaga\u4e3an\uff08n=sub-transaction\u7684\u6570\u91cf\uff09\u3002<\/li>\n<li>\u6709\u4e9b\u7b2c\u4e09\u65b9\u670d\u52a1\u6ca1\u6709Try\u63a5\u53e3\uff0cTCC\u6a21\u5f0f\u5b9e\u73b0\u8d77\u6765\u5c31\u6bd4\u8f83tricky\u4e86\uff0c\u800cSaga\u5219\u5f88\u7b80\u5355\u3002<\/li>\n<li>\u6ca1\u6709\u9884\u7559\u52a8\u4f5c\u5c31\u610f\u5473\u7740\u4e0d\u5fc5\u62c5\u5fc3\u8d44\u6e90\u91ca\u653e\u7684\u95ee\u9898\uff0c\u5f02\u5e38\u5904\u7406\u8d77\u6765\u4e5f\u66f4\u7b80\u5355\uff08\u8bf7\u5bf9\u6bd4Saga\u7684\u6062\u590d\u7b56\u7565\u548cTCC\u7684\u5f02\u5e38\u5904\u7406\uff09\u3002<\/li>\n<\/ul>\n<h2>2 Saga\u76f8\u5173\u5b9e\u73b0<\/h2>\n<p><strong>Saga Log<\/strong><\/p>\n<p>Saga\u4fdd\u8bc1\u6240\u6709\u7684\u5b50\u4e8b\u52a1\u90fd\u5f97\u4ee5\u5b8c\u6210\u6216\u8865\u507f\uff0c\u4f46Saga\u7cfb\u7edf\u672c\u8eab\u4e5f\u53ef\u80fd\u4f1a\u5d29\u6e83\u3002Saga\u5d29\u6e83\u65f6\u53ef\u80fd\u5904\u4e8e\u4ee5\u4e0b\u51e0\u4e2a\u72b6\u6001\uff1a<\/p>\n<ul>\n<li>Saga\u6536\u5230\u4e8b\u52a1\u8bf7\u6c42\uff0c\u4f46\u5c1a\u672a\u5f00\u59cb\u3002\u56e0\u5b50\u4e8b\u52a1\u5bf9\u5e94\u7684\u5fae\u670d\u52a1\u72b6\u6001\u672a\u88abSaga\u4fee\u6539\uff0c\u6211\u4eec\u4ec0\u4e48\u4e5f\u4e0d\u9700\u8981\u505a\u3002<\/li>\n<li>\u4e00\u4e9b\u5b50\u4e8b\u52a1\u5df2\u7ecf\u5b8c\u6210\u3002\u91cd\u542f\u540e\uff0cSaga\u5fc5\u987b\u63a5\u7740\u4e0a\u6b21\u5b8c\u6210\u7684\u4e8b\u52a1\u6062\u590d\u3002<\/li>\n<li>\u5b50\u4e8b\u52a1\u5df2\u5f00\u59cb\uff0c\u4f46\u5c1a\u672a\u5b8c\u6210\u3002\u7531\u4e8e\u8fdc\u7a0b\u670d\u52a1\u53ef\u80fd\u5df2\u5b8c\u6210\u4e8b\u52a1\uff0c\u4e5f\u53ef\u80fd\u4e8b\u52a1\u5931\u8d25\uff0c\u751a\u81f3\u670d\u52a1\u8bf7\u6c42\u8d85\u65f6\uff0csaga\u53ea\u80fd\u91cd\u65b0\u53d1\u8d77\u4e4b\u524d\u672a\u786e\u8ba4\u5b8c\u6210\u7684\u5b50\u4e8b\u52a1\u3002\u8fd9\u610f\u5473\u7740\u5b50\u4e8b\u52a1\u5fc5\u987b\u5e42\u7b49\u3002<\/li>\n<li>\u5b50\u4e8b\u52a1\u5931\u8d25\uff0c\u5176\u8865\u507f\u4e8b\u52a1\u5c1a\u672a\u5f00\u59cb\u3002Saga\u5fc5\u987b\u5728\u91cd\u542f\u540e\u6267\u884c\u5bf9\u5e94\u8865\u507f\u4e8b\u52a1\u3002<\/li>\n<li>\u8865\u507f\u4e8b\u52a1\u5df2\u5f00\u59cb\u4f46\u5c1a\u672a\u5b8c\u6210\u3002\u89e3\u51b3\u65b9\u6848\u4e0e\u4e0a\u4e00\u4e2a\u76f8\u540c\u3002\u8fd9\u610f\u5473\u7740\u8865\u507f\u4e8b\u52a1\u4e5f\u5fc5\u987b\u662f\u5e42\u7b49\u7684\u3002<\/li>\n<li>\u6240\u6709\u5b50\u4e8b\u52a1\u6216\u8865\u507f\u4e8b\u52a1\u5747\u5df2\u5b8c\u6210\uff0c\u4e0e\u7b2c\u4e00\u79cd\u60c5\u51b5\u76f8\u540c\u3002<\/li>\n<\/ul>\n<p>\u4e3a\u4e86\u6062\u590d\u5230\u4e0a\u8ff0\u72b6\u6001\uff0c\u6211\u4eec\u5fc5\u987b\u8ffd\u8e2a\u5b50\u4e8b\u52a1\u53ca\u8865\u507f\u4e8b\u52a1\u7684\u6bcf\u4e00\u6b65\u3002\u6211\u4eec\u51b3\u5b9a\u901a\u8fc7\u4e8b\u4ef6\u7684\u65b9\u5f0f\u8fbe\u5230\u4ee5\u4e0a\u8981\u6c42\uff0c\u5e76\u5c06\u4ee5\u4e0b\u4e8b\u4ef6\u4fdd\u5b58\u5728\u540d\u4e3asaga log\u7684\u6301\u4e45\u5b58\u50a8\u4e2d\uff1a<\/p>\n<ul>\n<li>Saga started event \u4fdd\u5b58\u6574\u4e2asaga\u8bf7\u6c42\uff0c\u5176\u4e2d\u5305\u62ec\u591a\u4e2a\u4e8b\u52a1\/\u8865\u507f\u8bf7\u6c42<\/li>\n<li>Transaction started event \u4fdd\u5b58\u5bf9\u5e94\u4e8b\u52a1\u8bf7\u6c42<\/li>\n<li>Transaction ended event \u4fdd\u5b58\u5bf9\u5e94\u4e8b\u52a1\u8bf7\u6c42\u53ca\u5176\u56de\u590d<\/li>\n<li>Transaction aborted event \u4fdd\u5b58\u5bf9\u5e94\u4e8b\u52a1\u8bf7\u6c42\u548c\u5931\u8d25\u7684\u539f\u56e0<\/li>\n<li>Transaction compensated event \u4fdd\u5b58\u5bf9\u5e94\u8865\u507f\u8bf7\u6c42\u53ca\u5176\u56de\u590d<\/li>\n<li>Saga ended event \u6807\u5fd7\u7740saga\u4e8b\u52a1\u8bf7\u6c42\u7684\u7ed3\u675f\uff0c\u4e0d\u9700\u8981\u4fdd\u5b58\u4efb\u4f55\u5185\u5bb9<\/li>\n<\/ul>\n<div class=\"image-package\">\n<div class=\"image-container\">\n<div class=\"image-container-fill\"><\/div>\n<div class=\"image-view\" data-width=\"825\" data-height=\"385\"><img decoding=\"async\" class=\"\" src=\"https:\/\/upload-images.jianshu.io\/upload_images\/725534-f5855867be999502.png?imageMogr2\/auto-orient\/strip|imageView2\/2\/w\/825\/format\/webp\" data-original-src=\"\/\/upload-images.jianshu.io\/upload_images\/725534-f5855867be999502.png\" data-original-width=\"825\" data-original-height=\"385\" data-original-format=\"image\/png\" data-original-filesize=\"59722\" data-image-index=\"0\" \/><\/div>\n<\/div>\n<div class=\"image-caption\">66ae7b320e502c13f4a21a08baa61ead<\/div>\n<\/div>\n<p>\u901a\u8fc7\u5c06\u8fd9\u4e9b\u4e8b\u4ef6\u6301\u4e45\u5316\u5728saga log\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06saga\u6062\u590d\u5230\u4e0a\u8ff0\u4efb\u4f55\u72b6\u6001\u3002<\/p>\n<p>\u7531\u4e8eSaga\u53ea\u9700\u8981\u505a\u4e8b\u4ef6\u7684\u6301\u4e45\u5316\uff0c\u800c\u4e8b\u4ef6\u5185\u5bb9\u4ee5JSON\u7684\u5f62\u5f0f\u5b58\u50a8\uff0cSaga log\u7684\u5b9e\u73b0\u975e\u5e38\u7075\u6d3b\uff0c\u6570\u636e\u5e93\uff08SQL\u6216NoSQL\uff09\uff0c\u6301\u4e45\u6d88\u606f\u961f\u5217\uff0c\u751a\u81f3\u666e\u901a\u6587\u4ef6\u53ef\u4ee5\u7528\u4f5c\u4e8b\u4ef6\u5b58\u50a8\uff0c \u5f53\u7136\u6709\u4e9b\u80fd\u66f4\u5feb\u5f97\u5e2esaga\u6062\u590d\u72b6\u6001\u3002<\/p>\n<p><strong>\u6ce8\u610f\u4e8b\u9879<\/strong><\/p>\n<p>\u5bf9\u4e8e\u670d\u52a1\u6765\u8bf4\uff0c\u5b9e\u73b0Saga\u6709\u4ee5\u4e0b\u8fd9\u4e9b\u8981\u6c42\uff1a<\/p>\n<ol>\n<li>T<sub>i<\/sub>\u548cC<sub>i<\/sub>\u662f\u5e42\u7b49\u7684\u3002<\/li>\n<li>C<sub>i<\/sub>\u5fc5\u987b\u662f\u80fd\u591f\u6210\u529f\u7684\uff0c\u5982\u679c\u65e0\u6cd5\u6210\u529f\u5219\u9700\u8981\u4eba\u5de5\u4ecb\u5165\u3002<\/li>\n<li>T<sub>i<\/sub>\u00a0&#8211; C<sub>i<\/sub>\u548cC<sub>i<\/sub>\u00a0&#8211; T<sub>i<\/sub>\u7684\u6267\u884c\u7ed3\u679c\u5fc5\u987b\u662f\u4e00\u6837\u7684\uff1asub-transaction\u88ab\u64a4\u9500\u4e86\u3002<\/li>\n<\/ol>\n<p>\u7b2c\u4e00\u70b9\u8981\u6c42T<sub>i<\/sub>\u548cC<sub>i<\/sub>\u662f\u5e42\u7b49\u7684\uff0c\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u5047\u8bbe\u5728\u6267\u884cT<sub>i<\/sub>\u7684\u65f6\u5019\u8d85\u65f6\u4e86\uff0c\u6b64\u65f6\u6211\u4eec\u662f\u4e0d\u77e5\u9053\u6267\u884c\u7ed3\u679c\u7684\uff0c\u5982\u679c\u91c7\u7528forward recovery\u7b56\u7565\u5c31\u4f1a\u518d\u6b21\u53d1\u9001T<sub>i<\/sub>\uff0c\u90a3\u4e48\u5c31\u6709\u53ef\u80fd\u51fa\u73b0T<sub>i<\/sub>\u88ab\u6267\u884c\u4e86\u4e24\u6b21\uff0c\u6240\u4ee5\u8981\u6c42T<sub>i<\/sub>\u5e42\u7b49\u3002\u5982\u679c\u91c7\u7528backward recovery\u7b56\u7565\u5c31\u4f1a\u53d1\u9001C<sub>i<\/sub>\uff0c\u800c\u5982\u679cC<sub>i<\/sub>\u4e5f\u8d85\u65f6\u4e86\uff0c\u5c31\u4f1a\u5c1d\u8bd5\u518d\u6b21\u53d1\u9001C<sub>i<\/sub>\uff0c\u90a3\u4e48\u5c31\u6709\u53ef\u80fd\u51fa\u73b0C<sub>i<\/sub>\u88ab\u6267\u884c\u4e24\u6b21\uff0c\u6240\u4ee5\u8981\u6c42C<sub>i<\/sub>\u5e42\u7b49\u3002<\/p>\n<p>\u7b2c\u4e8c\u70b9\u8981\u6c42C<sub>i<\/sub>\u5fc5\u987b\u80fd\u591f\u6210\u529f\uff0c\u8fd9\u4e2a\u5f88\u597d\u7406\u89e3\uff0c\u56e0\u4e3a\uff0c\u5982\u679cC<sub>i<\/sub>\u4e0d\u80fd\u6267\u884c\u6210\u529f\u5c31\u610f\u5473\u7740\u6574\u4e2aSaga\u65e0\u6cd5\u5b8c\u5168\u64a4\u9500\uff0c\u8fd9\u4e2a\u662f\u4e0d\u5141\u8bb8\u7684\u3002\u4f46\u603b\u4f1a\u51fa\u73b0\u4e00\u4e9b\u7279\u6b8a\u60c5\u51b5\u6bd4\u5982C<sub>i<\/sub>\u7684\u4ee3\u7801\u6709bug\u3001\u670d\u52a1\u957f\u65f6\u95f4\u5d29\u6e83\u7b49\uff0c\u8fd9\u4e2a\u65f6\u5019\u5c31\u9700\u8981\u4eba\u5de5\u4ecb\u5165\u4e86\u3002<\/p>\n<p>\u7b2c\u4e09\u70b9\u4e4d\u770b\u8d77\u6765\u6bd4\u8f83\u5947\u602a\uff0c\u4e3e\u4f8b\u8bf4\u660e\uff0c\u8fd8\u662f\u8003\u8651T<sub>i<\/sub>\u6267\u884c\u8d85\u65f6\u7684\u573a\u666f\uff0c\u6211\u4eec\u91c7\u7528\u4e86backward recovery\uff0c\u53d1\u9001\u4e00\u4e2aC<sub>i<\/sub>\uff0c\u90a3\u4e48\u5c31\u4f1a\u6709\u4e09\u79cd\u60c5\u51b5\uff1a<\/p>\n<ol>\n<li>T<sub>i<\/sub>\u7684\u8bf7\u6c42\u4e22\u5931\u4e86\uff0c\u670d\u52a1\u4e4b\u524d\u6ca1\u6709\u3001\u4e4b\u540e\u4e5f\u4e0d\u4f1a\u6267\u884cT<sub>i<\/sub><\/li>\n<li>T<sub>i<\/sub>\u5728C<sub>i<\/sub>\u4e4b\u524d\u6267\u884c<\/li>\n<li>C<sub>i<\/sub>\u5728T<sub>i<\/sub>\u4e4b\u524d\u6267\u884c<\/li>\n<\/ol>\n<p>\u5bf9\u4e8e\u7b2c1\u79cd\u60c5\u51b5\uff0c\u5bb9\u6613\u5904\u7406\u3002\u5bf9\u4e8e\u7b2c2\u30013\u79cd\u60c5\u51b5\uff0c\u5219\u8981\u6c42T<sub>i<\/sub>\u548cC<sub>i<\/sub>\u662f\u53ef\u4ea4\u6362\u7684\uff08commutative)\uff0c\u5e76\u4e14\u5176\u6700\u7ec8\u7ed3\u679c\u90fd\u662fsub-transaction\u88ab\u64a4\u9500\u3002<\/p>\n<h2>3 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data-original-format=\"image\/png\" data-original-filesize=\"352159\" data-image-index=\"1\" \/><\/div>\n<\/div>\n<div class=\"image-caption\">Screen Shot 2018-11-27 at 23.24.17<\/div>\n<\/div>\n<p>\u901a\u8fc7\u8fd9\u4e2asagas\u7684\u8def\u5f84\u5982\u4e0b\uff1a<\/p>\n<ol>\n<li>Order Service\u5728APPROVAL_PENDING\u72b6\u6001\u4e0b\u521b\u5efa\u4e00\u4e2aOrder\u5e76\u53d1\u5e03OrderCreated\u4e8b\u4ef6\u3002<\/li>\n<li>Consumer Service\u6d88\u8d39OrderCreated\u4e8b\u4ef6\uff0c\u9a8c\u8bc1\u6d88\u8d39\u8005\u662f\u5426\u53ef\u4ee5\u4e0b\u8ba2\u5355\uff0c\u5e76\u53d1\u5e03ConsumerVerified\u4e8b\u4ef6\u3002<\/li>\n<li>Kitchen Service\u6d88\u8d39OrderCreated\u4e8b\u4ef6\uff0c\u9a8c\u8bc1\u8ba2\u5355\uff0c\u5728CREATE_PENDING\u72b6\u6001\u4e0b\u521b\u5efa\u6545\u969c\u5355\uff0c\u5e76\u53d1\u5e03TicketCreated\u4e8b\u4ef6\u3002<\/li>\n<li>Accounting\u670d\u52a1\u6d88\u8d39OrderCreated\u4e8b\u4ef6\u5e76\u521b\u5efa\u4e00\u4e2a\u5904\u4e8ePENDING\u72b6\u6001\u7684Credit 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src=\"https:\/\/upload-images.jianshu.io\/upload_images\/725534-5072fa5cc41faa19.png?imageMogr2\/auto-orient\/strip|imageView2\/2\/w\/1200\/format\/webp\" data-original-src=\"\/\/upload-images.jianshu.io\/upload_images\/725534-5072fa5cc41faa19.png\" data-original-width=\"1892\" data-original-height=\"1232\" data-original-format=\"image\/png\" data-original-filesize=\"352230\" data-image-index=\"2\" \/><\/div>\n<\/div>\n<div class=\"image-caption\">Screen Shot 2018-11-27 at 23.54.12<\/div>\n<\/div>\n<p>\u4e8b\u4ef6\u987a\u5e8f\u5982\u4e0b\uff1a<\/p>\n<ol>\n<li>Order\u670d\u52a1\u5728APPROVAL_PENDING\u72b6\u6001\u4e0b\u521b\u5efa\u4e00\u4e2aOrder\u5e76\u53d1\u5e03OrderCreated\u4e8b\u4ef6\u3002<\/li>\n<li>Consumer\u670d\u52a1\u6d88\u8d39OrderCreated\u4e8b\u4ef6\uff0c\u9a8c\u8bc1\u6d88\u8d39\u8005\u662f\u5426\u53ef\u4ee5\u4e0b\u8ba2\u5355\uff0c\u5e76\u53d1\u5e03ConsumerVerified\u4e8b\u4ef6\u3002<\/li>\n<li>Kitchen\u670d\u52a1\u6d88\u8d39OrderCreated\u4e8b\u4ef6\uff0c\u9a8c\u8bc1\u8ba2\u5355\uff0c\u5728CREATE_PENDING\u72b6\u6001\u4e0b\u521b\u5efa\u6545\u969c\u5355\uff0c\u5e76\u53d1\u5e03TicketCreated\u4e8b\u4ef6\u3002<\/li>\n<li>Accounting\u670d\u52a1\u6d88\u8d39OrderCreated\u4e8b\u4ef6\u5e76\u521b\u5efa\u4e00\u4e2a\u5904\u4e8ePENDING\u72b6\u6001\u7684Credit CardAuthorization\u3002<\/li>\n<li>Accounting\u670d\u52a1\u6d88\u8d39TicketCreated\u548cConsumerVerified\u4e8b\u4ef6\uff0c\u5411\u6d88\u8d39\u8005\u7684\u4fe1\u7528\u5361\u6536\u8d39\uff0c\u5e76\u53d1\u5e03\u4fe1\u7528\u5361\u6388\u6743\u5931\u8d25\u4e8b\u4ef6\u3002<\/li>\n<li>Kitchen\u670d\u52a1\u4f7f\u7528\u4fe1\u7528\u5361\u6388\u6743\u5931\u8d25\u4e8b\u4ef6\u5e76\u5c06\u6545\u969c\u5355\u7684\u72b6\u6001\u66f4\u6539\u4e3aREJECTED\u3002<\/li>\n<li>\u8ba2\u5355\u670d\u52a1\u6d88\u8d39\u4fe1\u7528\u5361\u6388\u6743\u5931\u8d25\u4e8b\u4ef6\uff0c\u5e76\u5c06\u8ba2\u5355\u72b6\u6001\u66f4\u6539\u4e3a\u5df2\u62d2\u7edd\u3002<\/li>\n<\/ol>\n<p><strong>\u53ef\u9760\u7684\u57fa\u4e8e\u4e8b\u4ef6\u7684\u901a\u4fe1<\/strong><\/p>\n<p>\u5728\u5b9e\u65bd\u57fa\u4e8e\u7f16\u6392\u7684saga\u65f6\uff0c\u60a8\u5fc5\u987b\u8003\u8651\u4e00\u4e9b\u4e0e\u670d\u52a1\u95f4\u901a\u4fe1\u76f8\u5173\u7684\u95ee\u9898\u3002\u7b2c\u4e00\u4e2a\u95ee\u9898\u662f\u786e\u4fddsaga\u53c2\u4e0e\u8005\u66f4\u65b0\u5176\u6570\u636e\u5e93\u5e76\u5c06\u4e8b\u4ef6\u4f5c\u4e3a\u6570\u636e\u5e93\u4e8b\u52a1\u7684\u4e00\u90e8\u5206\u53d1\u5e03\u3002<br \/>\n\u60a8\u9700\u8981\u8003\u8651\u7684\u7b2c\u4e8c\u4e2a\u95ee\u9898\u662f\u786e\u4fddsaga\u53c2\u4e0e\u8005\u5fc5\u987b\u80fd\u591f\u5c06\u6536\u5230\u7684\u6bcf\u4e2a\u4e8b\u4ef6\u6620\u5c04\u5230\u81ea\u5df1\u7684\u6570\u636e\u3002<\/p>\n<p><strong>\u7f16\u7ec4\u7684saga\u7684\u597d\u5904\u548c\u7f3a\u70b9<\/strong><\/p>\n<p>\u57fa\u4e8e\u7f16\u821e\u7684saga\u6709\u51e0\u4e2a<strong>\u597d\u5904<\/strong>\uff1a<\/p>\n<ul>\n<li>\u7b80\u5355\uff1a\u670d\u52a1\u5728\u521b\u5efa\uff0c\u66f4\u65b0\u6216\u5220\u9664\u4e1a\u52a1\u65f6\u53d1\u5e03\u4e8b\u4ef6\u5bf9\u8c61<\/li>\n<li>\u677e\u8026\u5408\uff1a\u53c2\u4e0e\u8005\u8ba2\u9605\u4e8b\u4ef6\u5e76\u4e14\u5f7c\u6b64\u4e4b\u95f4\u6ca1\u6709\u76f4\u63a5\u7684\u4e86\u89e3\u3002<\/li>\n<\/ul>\n<p>\u5e76\u4e14\u6709\u4e00\u4e9b<strong>\u7f3a\u70b9<\/strong>\uff1a<\/p>\n<ul>\n<li>\u66f4\u96be\u7406\u89e3\uff1a\u4e0e\u4e1a\u52a1\u6d41\u7a0b\u4e0d\u540c\uff0c\u4ee3\u7801\u4e2d\u6ca1\u6709\u4e00\u4e2a\u5730\u65b9\u53ef\u4ee5\u5b9a\u4e49saga\u3002\u76f8\u53cd\uff0c\u7f16\u6392\u5728\u670d\u52a1\u4e2d\u5206\u914dsaga\u7684\u5b9e\u73b0\u3002\u56e0\u6b64\uff0c\u5f00\u53d1\u4eba\u5458\u6709\u65f6\u5f88\u96be\u7406\u89e3\u7ed9\u5b9a\u7684saga\u662f\u5982\u4f55\u5de5\u4f5c\u7684\u3002<\/li>\n<li>\u670d\u52a1\u4e4b\u95f4\u7684\u5faa\u73af\u4f9d\u8d56\u5173\u7cfb\uff1asaga\u53c2\u4e0e\u8005\u8ba2\u9605\u5f7c\u6b64\u7684\u4e8b\u4ef6\uff0c\u8fd9\u901a\u5e38\u4f1a\u521b\u5efa\u5faa\u73af\u4f9d\u8d56\u5173\u7cfb\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4ed4\u7ec6\u68c0\u67e5\u56fe\u793a\uff0c\u60a8\u5c06\u770b\u5230\u5b58\u5728\u5faa\u73af\u4f9d\u8d56\u5173\u7cfb\uff0c\u4f8b\u5982\u8ba2\u5355\u670d\u52a1\u3001\u4f1a\u8ba1\u670d\u52a1\u3001\u8ba2\u5355\u670d\u52a1\u3002\u867d\u7136\u8fd9\u4e0d\u4e00\u5b9a\u662f\u4e2a\u95ee\u9898\uff0c\u4f46\u5faa\u73af\u4f9d\u8d56\u6027\u88ab\u8ba4\u4e3a\u662f\u8bbe\u8ba1\u95ee\u9898\u3002<\/li>\n<li>\u7d27\u5bc6\u8026\u5408\u7684\u98ce\u9669\uff1a\u6bcf\u4e2asaga\u53c2\u4e0e\u8005\u90fd\u9700\u8981\u8ba2\u9605\u6240\u6709\u5f71\u54cd\u4ed6\u4eec\u7684\u4e8b\u4ef6\u3002\u4f8b\u5982\uff0c\u4f1a\u8ba1\u670d\u52a1\u5fc5\u987b\u8ba2\u9605\u5bfc\u81f4\u6d88\u8d39\u8005\u4fe1\u7528\u5361\u88ab\u6536\u8d39\u6216\u9000\u6b3e\u7684\u6240\u6709\u4e8b\u4ef6\u3002\u56e0\u6b64\uff0c\u5b58\u5728\u4e00\u79cd\u98ce\u9669\uff0c\u5373\u9700\u8981\u4e0eOrder Service\u5b9e\u65bd\u7684\u8ba2\u5355\u751f\u547d\u5468\u671f\u4fdd\u6301\u540c\u6b65\u66f4\u65b0\u3002<\/li>\n<\/ul>\n<h3>3.2 \u63a7\u5236\uff08Orchestration\uff09<\/h3>\n<p>\u63a7\u5236\u662f\u5b9e\u73b0sagas\u7684\u53e6\u4e00\u79cd\u65b9\u5f0f\u3002\u4f7f\u7528\u4e1a\u52a1\u6d41\u7a0b\u65f6\uff0c\u60a8\u53ef\u4ee5\u5b9a\u4e49\u4e00\u4e2a\u63a7\u5236\u7c7b\uff0c\u5176\u552f\u4e00\u7684\u804c\u8d23\u662f\u544a\u8bc9saga\u53c2\u4e0e\u8005\u8be5\u505a\u4ec0\u4e48\u3002 saga\u63a7\u5236\u4f7f\u7528\u547d\u4ee4\/\u5f02\u6b65\u56de\u590d\u6837\u5f0f\u4ea4\u4e92\u4e0e\u53c2\u4e0e\u8005\u8fdb\u884c\u901a\u4fe1\u3002<\/p>\n<div class=\"image-package\">\n<div class=\"image-container\">\n<div class=\"image-container-fill\"><\/div>\n<div class=\"image-view\" data-width=\"1784\" data-height=\"1428\"><img decoding=\"async\" class=\"\" src=\"https:\/\/upload-images.jianshu.io\/upload_images\/725534-bdb40bd4f0fcf148.png?imageMogr2\/auto-orient\/strip|imageView2\/2\/w\/1200\/format\/webp\" data-original-src=\"\/\/upload-images.jianshu.io\/upload_images\/725534-bdb40bd4f0fcf148.png\" data-original-width=\"1784\" data-original-height=\"1428\" data-original-format=\"image\/png\" data-original-filesize=\"384812\" data-image-index=\"3\" \/><\/div>\n<\/div>\n<div class=\"image-caption\">Screen Shot 2018-11-28 at 00.08.51<\/div>\n<\/div>\n<ol>\n<li>Order Service\u9996\u5148\u521b\u5efa\u4e00\u4e2aOrder\u548c\u4e00\u4e2a\u521b\u5efa\u8ba2\u5355\u63a7\u5236\u5668\u3002\u4e4b\u540e\uff0c\u8def\u5f84\u7684\u6d41\u7a0b\u5982\u4e0b\uff1a<\/li>\n<li>saga orchestrator\u5411Consumer Service\u53d1\u9001Verify Consumer\u547d\u4ee4\u3002<\/li>\n<li>Consumer Service\u56de\u590dConsumer Verified\u6d88\u606f\u3002<\/li>\n<li>saga orchestrator\u5411Kitchen Service\u53d1\u9001Create Ticket\u547d\u4ee4\u3002<\/li>\n<li>Kitchen Service\u56de\u590dTicket Created\u6d88\u606f\u3002<\/li>\n<li>saga\u534f\u8c03\u5668\u5411Accounting Service\u53d1\u9001\u6388\u6743\u5361\u6d88\u606f\u3002<\/li>\n<li>Accounting\u670d\u52a1\u90e8\u95e8\u4f7f\u7528\u5361\u7247\u6388\u6743\u6d88\u606f\u56de\u590d\u3002<\/li>\n<li>saga orchestrator\u5411Kitchen Service\u53d1\u9001Approve Ticket\u547d\u4ee4\u3002<\/li>\n<li>saga orchestrator\u5411\u8ba2\u5355\u670d\u52a1\u53d1\u9001\u6279\u51c6\u8ba2\u5355\u547d\u4ee4\u3002<\/li>\n<\/ol>\n<p><strong>\u4f7f\u7528\u72b6\u6001\u673a\u5efa\u6a21SAGA ORCHESTRATORS<\/strong><\/p>\n<p>\u5efa\u6a21saga orchestrator\u7684\u597d\u65b9\u6cd5\u662f\u4f5c\u4e3a\u72b6\u6001\u673a\u3002\u72b6\u6001\u673a\u7531\u4e00\u7ec4\u72b6\u6001\u548c\u4e00\u7ec4\u7531\u4e8b\u4ef6\u89e6\u53d1\u7684\u72b6\u6001\u4e4b\u95f4\u7684\u8f6c\u6362\u7ec4\u6210\u3002\u6bcf\u4e2atransition\u90fd\u53ef\u4ee5\u6709\u4e00\u4e2aaction\uff0c\u5bf9\u4e8e\u4e00\u4e2asaga\u6765\u8bf4\u662f\u4e00\u4e2asaga\u53c2\u4e0e\u8005\u7684\u8c03\u7528\u3002\u72b6\u6001\u4e4b\u95f4\u7684\u8f6c\u6362\u7531saga\u53c2\u4e0e\u8005\u6267\u884c\u7684\u672c\u5730\u4e8b\u52a1\u7684\u5b8c\u6210\u89e6\u53d1\u3002\u5f53\u524d\u72b6\u6001\u548c\u672c\u5730\u4e8b\u52a1\u7684\u7279\u5b9a\u7ed3\u679c\u51b3\u5b9a\u4e86\u72b6\u6001\u8f6c\u6362\u4ee5\u53ca\u6267\u884c\u7684\u64cd\u4f5c\uff08\u5982\u679c\u6709\u7684\u8bdd\uff09\u3002\u5bf9\u72b6\u6001\u673a\u4e5f\u6709\u6709\u6548\u7684\u6d4b\u8bd5\u7b56\u7565\u3002\u56e0\u6b64\uff0c\u4f7f\u7528\u72b6\u6001\u673a\u6a21\u578b\u53ef\u4ee5\u66f4\u8f7b\u677e\u5730\u8bbe\u8ba1\u3001\u5b9e\u65bd\u548c\u6d4b\u8bd5\u3002<\/p>\n<div class=\"image-package\">\n<div class=\"image-container\">\n<div class=\"image-container-fill\"><\/div>\n<div class=\"image-view\" data-width=\"1938\" data-height=\"1494\"><img decoding=\"async\" class=\"\" src=\"https:\/\/upload-images.jianshu.io\/upload_images\/725534-893ec158a7f5c2d7.png?imageMogr2\/auto-orient\/strip|imageView2\/2\/w\/1200\/format\/webp\" data-original-src=\"\/\/upload-images.jianshu.io\/upload_images\/725534-893ec158a7f5c2d7.png\" data-original-width=\"1938\" data-original-height=\"1494\" data-original-format=\"image\/png\" data-original-filesize=\"296347\" data-image-index=\"4\" \/><\/div>\n<\/div>\n<div class=\"image-caption\">Screen Shot 2018-11-28 at 00.12.58<\/div>\n<\/div>\n<p>\u56fe\u663e\u793a\u4e86Create Order Saga\u7684\u72b6\u6001\u673a\u6a21\u578b\u3002\u6b64\u72b6\u6001\u673a\u7531\u591a\u4e2a\u72b6\u6001\u7ec4\u6210\uff0c\u5305\u62ec\u4ee5\u4e0b\u5185\u5bb9\uff1a<\/p>\n<ul>\n<li>Verifying Consumer\uff1a\u521d\u59cb\u72b6\u6001\u3002\u5f53\u5904\u4e8e\u6b64\u72b6\u6001\u65f6\uff0c\u8be5saga\u6b63\u5728\u7b49\u5f85\u6d88\u8d39\u8005\u670d\u52a1\u90e8\u95e8\u9a8c\u8bc1\u6d88\u8d39\u8005\u662f\u5426\u53ef\u4ee5\u4e0b\u8ba2\u5355\u3002<\/li>\n<li>Creating Ticket\uff1a\u8be5saga\u6b63\u5728\u7b49\u5f85\u5bf9\u521b\u5efa\u7968\u8bc1\u547d\u4ee4\u7684\u56de\u590d\u3002<\/li>\n<li>Authorizing Card\uff1a\u7b49\u5f85Accounting\u670d\u52a1\u6388\u6743\u6d88\u8d39\u8005\u7684\u4fe1\u7528\u5361\u3002<\/li>\n<li>OrderApproved\uff1a\u8868\u793asaga\u6210\u529f\u5b8c\u6210\u7684\u6700\u7ec8\u72b6\u6001\u3002<\/li>\n<li>Order Rejected\uff1a\u6700\u7ec8\u72b6\u6001\u8868\u660e\u8be5\u8ba2\u5355\u88ab\u5176\u4e2d\u4e00\u65b9\u53c2\u4e0e\u8005\u4eec\u62d2\u7edd\u3002<\/li>\n<\/ul>\n<p><strong>SAGA ORCHESTRATION\u548cTRANSACTIONAL MESSAGING<\/strong><\/p>\n<p>\u57fa\u4e8e\u4e1a\u52a1\u6d41\u7a0b\u7684saga\u7684\u6bcf\u4e2a\u6b65\u9aa4\u90fd\u5305\u62ec\u66f4\u65b0\u6570\u636e\u5e93\u548c\u53d1\u5e03\u6d88\u606f\u7684\u670d\u52a1\u3002\u4f8b\u5982\uff0cOrder Service\u6301\u4e45\u4fdd\u5b58Order\u548cCreate Order Saga orchestrator\uff0c\u5e76\u5411\u7b2c\u4e00\u4e2asaga\u53c2\u4e0e\u8005\u53d1\u9001\u6d88\u606f\u3002\u4e00\u4e2asaga\u53c2\u4e0e\u8005\uff0c\u4f8b\u5982Kitchen Service\uff0c\u901a\u8fc7\u66f4\u65b0\u5176\u6570\u636e\u5e93\u5e76\u53d1\u9001\u56de\u590d\u6d88\u606f\u6765\u5904\u7406\u547d\u4ee4\u6d88\u606f\u3002 Order Service\u901a\u8fc7\u66f4\u65b0saga\u534f\u8c03\u5668\u7684\u72b6\u6001\u5e76\u5411\u4e0b\u4e00\u4e2asaga\u53c2\u4e0e\u8005\u53d1\u9001\u547d\u4ee4\u6d88\u606f\u6765\u5904\u7406\u53c2\u4e0e\u8005\u7684\u56de\u590d\u6d88\u606f\u3002\u670d\u52a1\u5fc5\u987b\u4f7f\u7528\u4e8b\u52a1\u6027\u6d88\u606f\u4f20\u9012\uff0c\u4ee5\u4fbf\u81ea\u52a8\u66f4\u65b0\u6570\u636e\u5e93\u5e76\u53d1\u5e03\u6d88\u606f\u3002<\/p>\n<p><strong>\u8ba9\u6211\u4eec\u6765\u770b\u770b\u4f7f\u7528saga\u7f16\u6392\u7684\u597d\u5904\u548c\u7f3a\u70b9\u3002<\/strong><\/p>\n<p>\u57fa\u4e8eORCHESTRATION\u7684SAGAS\u7684\u597d\u5904\u548c\u7f3a\u70b9<\/p>\n<p>\u57fa\u4e8e\u7f16\u6392\u7684saga\u6709\u51e0\u4e2a\u597d\u5904\uff1a<\/p>\n<ol>\n<li>\u66f4\u7b80\u5355\u7684\u4f9d\u8d56\u5173\u7cfb\uff1a\u7f16\u6392\u7684\u4e00\u4e2a\u597d\u5904\u662f\u5b83\u4e0d\u4f1a\u5f15\u5165\u5faa\u73af\u4f9d\u8d56\u5173\u7cfb\u3002 saga orchestrator\u8c03\u7528saga\u53c2\u4e0e\u8005\uff0c\u4f46\u53c2\u4e0e\u8005\u4e0d\u4f1a\u8c03\u7528orchestrator\u3002\u56e0\u6b64\uff0c\u534f\u8c03\u5668\u4f9d\u8d56\u4e8e\u53c2\u4e0e\u8005\uff0c\u4f46\u53cd\u4e4b\u4ea6\u7136\uff0c\u56e0\u6b64\u6ca1\u6709\u5faa\u73af\u4f9d\u8d56\u6027\u3002<\/li>\n<li>\u8f83\u5c11\u7684\u8026\u5408\uff1a\u6bcf\u4e2a\u670d\u52a1\u90fd\u5b9e\u73b0\u4e86\u7531orchestrator\u8c03\u7528\u7684API\uff0c\u56e0\u6b64\u5b83\u4e0d\u9700\u8981\u77e5\u9053saga\u53c2\u4e0e\u8005\u53d1\u5e03\u7684\u4e8b\u4ef6\u3002<\/li>\n<li>\u6539\u5584\u5173\u6ce8\u70b9\u5206\u79bb\u5e76\u7b80\u5316\u4e1a\u52a1\u903b\u8f91\uff1asaga\u534f\u8c03\u903b\u8f91\u672c\u5730\u5316\u5728saga\u534f\u8c03\u5668\u4e2d\u3002\u57df\u5bf9\u8c61\u66f4\u7b80\u5355\uff0c\u5e76\u4e14\u4e0d\u4e86\u89e3\u5b83\u4eec\u53c2\u4e0e\u7684saga\u3002\u4f8b\u5982\uff0c\u5f53\u4f7f\u7528\u7f16\u6392\u65f6\uff0cOrder\u7c7b\u4e0d\u77e5\u9053\u4efb\u4f55saga\uff0c\u56e0\u6b64\u5b83\u5177\u6709\u66f4\u7b80\u5355\u7684\u72b6\u6001\u673a\u6a21\u578b\u3002\u5728\u6267\u884c\u521b\u5efa\u8ba2\u5355saga\u671f\u95f4\uff0c\u5b83\u76f4\u63a5\u4eceAPPROVAL_PENDING\u72b6\u6001\u8f6c\u6362\u5230APPROVED\u72b6\u6001\u3002 Order\u7c7b\u6ca1\u6709\u4e0esaga\u7684\u6b65\u9aa4\u76f8\u5bf9\u5e94\u7684\u4efb\u4f55\u4e2d\u95f4\u72b6\u6001\u3002\u56e0\u6b64\uff0c\u4e1a\u52a1\u66f4\u52a0\u7b80\u5355\u3002<\/li>\n<\/ol>\n<p>\u4e1a\u52a1\u6d41\u7a0b\u4e5f\u6709\u4e00\u4e2a<strong>\u7f3a\u70b9<\/strong>\uff1a<\/p>\n<ul>\n<li>\u5728\u534f\u8c03\u5668\u4e2d\u96c6\u4e2d\u8fc7\u591a\u4e1a\u52a1\u903b\u8f91\u7684\u98ce\u9669\u3002\u8fd9\u5bfc\u81f4\u4e86\u4e00\u79cd\u8bbe\u8ba1\uff0c\u5176\u4e2d\u667a\u80fd\u534f\u8c03\u5668\u544a\u8bc9\u54d1\u5df4\u670d\u52a1\u8981\u505a\u4ec0\u4e48\u64cd\u4f5c\u3002\u5e78\u8fd0\u7684\u662f\uff0c\u60a8\u53ef\u4ee5\u901a\u8fc7\u8bbe\u8ba1\u72ec\u7acb\u8d1f\u8d23\u6392\u5e8f\u7684\u534f\u8c03\u5668\u6765\u907f\u514d\u6b64\u95ee\u9898\uff0c\u5e76\u4e14\u4e0d\u5305\u542b\u4efb\u4f55\u5176\u4ed6\u4e1a\u52a1\u903b\u8f91\u3002<\/li>\n<\/ul>\n<p>\u9664\u4e86\u6700\u7b80\u5355\u7684saga\uff0c\u6211\u5efa\u8bae\u4f7f\u7528\u7f16\u6392\u3002\u4e3a\u60a8\u7684saga\u5b9e\u65bd\u534f\u8c03\u903b\u8f91\u53ea\u662f\u60a8\u9700\u8981\u89e3\u51b3\u7684\u8bbe\u8ba1\u95ee\u9898\u4e4b\u4e00\u3002<\/p>\n<h1>4 \u53c2\u8003\u793a\u4f8b<\/h1>\n<ul>\n<li><a href=\"https:\/\/github.com\/chanjarster\/transactions\/blob\/master\/saga.md\" target=\"_blank\" rel=\"nofollow noopener\">Saga<\/a><\/li>\n<li><a href=\"https:\/\/servicecomb.incubator.apache.org\/docs\/distributed_saga_1\/\" target=\"_blank\" rel=\"nofollow noopener\">Eventual Data Consistency Solution in ServiceComb &#8211; part 1<\/a><\/li>\n<li><a href=\"https:\/\/servicecomb.incubator.apache.org\/docs\/distributed_saga_2\/\" target=\"_blank\" rel=\"nofollow noopener\">Eventual Data Consistency Solution in ServiceComb &#8211; part 2<\/a><\/li>\n<li><a href=\"https:\/\/servicecomb.incubator.apache.org\/docs\/distributed_saga_3\/\" target=\"_blank\" rel=\"nofollow noopener\">Eventual Data Consistency Solution in ServiceComb &#8211; part 3<\/a><\/li>\n<li><a href=\"https:\/\/opentalk.upyun.com\/310.html\" target=\"_blank\" rel=\"nofollow noopener\">\u5fae\u670d\u52a1\u573a\u666f\u4e0b\u7684\u6570\u636e\u4e00\u81f4\u6027\u89e3\u51b3\u65b9\u6848<\/a><\/li>\n<li><a href=\"https:\/\/microservices.io\/\" target=\"_blank\" rel=\"nofollow noopener\">Microservices Patterns by Chris Richardson<\/a><\/li>\n<\/ul>\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>\u539f\u6587\u5730\u5740 1 Saga\u76f8\u5173\u6982\u5ff5 1987<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","footnotes":""},"categories":[],"tags":[119],"class_list":["post-5070","post","type-post","status-publish","format-standard","hentry","tag-03-"],"_links":{"self":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/5070","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/comments?post=5070"}],"version-history":[{"count":0,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/5070\/revisions"}],"wp:attachment":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/media?parent=5070"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/categories?post=5070"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/tags?post=5070"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}