{"id":516,"date":"2018-04-14T16:44:47","date_gmt":"2018-04-14T08:44:47","guid":{"rendered":"https:\/\/www.chenweikang.top\/?p=516"},"modified":"2018-04-14T16:47:13","modified_gmt":"2018-04-14T08:47:13","slug":"%e4%bd%93%e7%b3%bb%e5%8c%96%e8%ae%a4%e8%af%86rpc","status":"publish","type":"post","link":"https:\/\/www.chenweikang.top\/?p=516","title":{"rendered":"\u4f53\u7cfb\u5316\u8ba4\u8bc6RPC"},"content":{"rendered":"<p><strong>RPC<\/strong>\uff08Remote Procedure Call\uff09\uff0c\u5373\u8fdc\u7a0b\u8fc7\u7a0b\u8c03\u7528\uff0c\u662f\u4e00\u4e2a\u5206\u5e03\u5f0f\u7cfb\u7edf\u95f4\u901a\u4fe1\u7684\u5fc5\u5907\u6280\u672f\uff0c\u672c\u6587\u4f53\u7cfb\u6027\u5730\u4ecb\u7ecd\u4e86 RPC \u5305\u542b\u7684\u6838\u5fc3\u6982\u5ff5\u548c\u6280\u672f\uff0c\u5e0c\u671b\u8bfb\u8005\u8bfb\u5b8c\u6587\u7ae0\uff0c\u4e00\u63d0\u5230 RPC\uff0c\u8111\u4e2d\u4e0d\u662f\u96f6\u788e\u7684\u77e5\u8bc6\uff0c\u800c\u662f\u5177\u4f53\u7684\u4e00\u4e2a\u8111\u56fe\u822c\u7684\u4f53\u7cfb\u3002\u672c\u6587\u5e76\u4e0d\u4f1a\u6df1\u5165\u5230\u6bcf\u4e00\u4e2a\u4e3b\u9898\u5256\u6790\uff0c\u53ea\u505a\u63d0\u7eb2\u6308\u9886\u7684\u4ecb\u7ecd\u3002<\/p>\n<p>RPC \u6700\u6838\u5fc3\u8981\u89e3\u51b3\u7684\u95ee\u9898\u5c31\u662f\u5728\u5206\u5e03\u5f0f\u7cfb\u7edf\u95f4\uff0c\u5982\u4f55\u6267\u884c\u53e6\u5916\u4e00\u4e2a\u5730\u5740\u7a7a\u95f4\u4e0a\u7684\u51fd\u6570\u3001\u65b9\u6cd5\uff0c\u5c31\u4eff\u4f5b\u5728\u672c\u5730\u8c03\u7528\u4e00\u6837\uff0c\u4e2a\u4eba\u603b\u7ed3\u7684 RPC \u6700\u6838\u5fc3\u7684\u6982\u5ff5\u548c\u6280\u672f\u5305\u62ec\u5982\u4e0b\uff0c\u5982\u56fe\u6240\u793a\uff1a<\/p>\n<p>(\u70b9\u51fb\u653e\u5927\u56fe\u50cf)<\/p>\n<p><a href=\"https:\/\/res.infoq.com\/articles\/get-to-know-rpc\/zh\/resources\/261-1508862334950.jpg\" class=\"gallery_colorbox\"><img decoding=\"async\" src=\"https:\/\/res.infoq.com\/articles\/get-to-know-rpc\/zh\/resources\/261-1508862334950.jpg\" alt=\"\" data-src=\"articles\/get-to-know-rpc\/zh\/resources\/261-1508862334950.jpg\"  \/><\/a><\/p>\n<p>\u4e0b\u9762\u4f9d\u6b21\u5c55\u5f00\u6bcf\u4e2a\u90e8\u5206\u3002<\/p>\n<h2>\u4f20\u8f93\uff08Transport\uff09<\/h2>\n<p>TCP \u534f\u8bae\u662f RPC \u7684 <strong>\u57fa\u77f3<\/strong>\uff0c\u4e00\u822c\u6765\u8bf4\u901a\u4fe1\u662f\u5efa\u7acb\u5728 TCP \u534f\u8bae\u4e4b\u4e0a\u7684\uff0c\u800c\u4e14 RPC \u5f80\u5f80\u9700\u8981\u53ef\u9760\u7684\u901a\u4fe1\uff0c\u56e0\u6b64\u4e0d\u91c7\u7528 UDP\u3002<\/p>\n<p>\u8fd9\u91cc\u91cd\u7533\u4e0b TCP \u7684\u5173\u952e\u8bcd\uff1a<strong>\u9762\u5411\u8fde\u63a5\u7684\uff0c\u5168\u53cc\u5de5\uff0c\u53ef\u9760\u4f20\u8f93\uff08\u6309\u5e8f\u3001\u4e0d\u91cd\u3001\u4e0d\u4e22\u3001\u5bb9\u9519\uff09\uff0c\u6d41\u91cf\u63a7\u5236\uff08\u6ed1\u52a8\u7a97\u53e3\uff09<\/strong>\u3002<\/p>\n<p>\u53e6\u5916\uff0c\u8981\u7406\u89e3 RPC \u4e2d\u7684<strong>\u5d4c\u5957 header+body<\/strong>\uff0c\u534f\u8bae\u6808\u6bcf\u4e00\u5c42\u90fd\u5305\u542b\u4e86\u4e0b\u4e00\u5c42\u534f\u8bae\u7684\u5168\u90e8\u6570\u636e\uff0c\u53ea\u4e0d\u8fc7\u5305\u4e86\u4e00\u4e2a\u5934\u800c\u5df2\uff0c\u5982\u4e0b\u56fe\u6240\u793a\u7684 TCP segment \u5305\u542b\u4e86\u5e94\u7528\u5c42\u7684\u6570\u636e\uff0c\u5957\u4e86\u4e00\u4e2a\u5934\u800c\u5df2\u3002<\/p>\n<p>(\u70b9\u51fb\u653e\u5927\u56fe\u50cf)<\/p>\n<p><a href=\"https:\/\/res.infoq.com\/articles\/get-to-know-rpc\/zh\/resources\/192-1508862334949.jpg\" class=\"gallery_colorbox\"><img decoding=\"async\" src=\"https:\/\/res.infoq.com\/articles\/get-to-know-rpc\/zh\/resources\/192-1508862334949.jpg\" alt=\"\" data-src=\"articles\/get-to-know-rpc\/zh\/resources\/192-1508862334949.jpg\"  \/><\/a><\/p>\n<p>\u90a3\u4e48 RPC \u4f20\u8f93\u7684 message \u4e5f\u5c31\u662f TCP body \u4e2d\u7684\u6570\u636e\uff0c\u8fd9\u4e2a message \u4e5f\u540c\u6837\u53ef\u4ee5\u5305\u542b header+body\u3002body \u4e5f\u7ecf\u5e38\u53eb\u505a payload\u3002<\/p>\n<p>TCP \u5c31\u662f\u53ef\u9760\u5730\u628a\u6570\u636e\u5728\u4e0d\u540c\u7684\u5730\u5740\u7a7a\u95f4\u4e0a\u642c\u8fd0\uff0c\u4f8b\u5982\u5728\u4f20\u7edf\u7684\u963b\u585e I\/O \u6a21\u578b\u4e2d\uff0c\u5f53\u6709\u6570\u636e\u8fc7\u6765\u7684\u65f6\u5019\uff0c\u64cd\u4f5c\u7cfb\u7edf\u5185\u6838\u628a\u6570\u636e\u4ece I\/O \u4e2d\u8bfb\u51fa\u6765\u5b58\u653e\u5728 kernal space\uff0c\u7136\u540e\u5185\u6838\u5c31\u901a\u77e5 user space \u53ef\u4ee5\u62f7\u8d1d\u8d70\u6570\u636e\uff0c\u7528\u4ee5\u817e\u51fa\u7a7a\u95f4\uff0c\u8ba9 TCP \u6ed1\u52a8\u7a97\u53e3\u5411\u524d\u79fb\u52a8\uff0c\u63a5\u6536\u66f4\u591a\u7684\u6570\u636e\u3002<\/p>\n<p>TCP \u534f\u8bae\u6808\u5b58\u5728\u7aef\u53e3\u7684\u6982\u5ff5\uff0c\u7aef\u53e3\u662f\u8fdb\u7a0b\u83b7\u53d6\u6570\u636e\u7684\u6e20\u9053\u3002<\/p>\n<h2>I\/O \u6a21\u578b\uff08I\/O Model\uff09<\/h2>\n<p>\u505a\u4e00\u4e2a\u9ad8\u6027\u80fd \/scalable \u7684 RPC\uff0c\u9700\u8981\u80fd\u591f\u6ee1\u8db3\uff1a<\/p>\n<ul>\n<li>\u7b2c\u4e00\uff0c\u670d\u52a1\u7aef\u5c3d\u53ef\u80fd\u591a\u7684\u5904\u7406\u5e76\u53d1\u8bf7\u6c42<\/li>\n<li>\u7b2c\u4e8c\uff0c\u540c\u65f6\u5c3d\u53ef\u80fd\u77ed\u7684\u5904\u7406\u5b8c\u6bd5\u3002<\/li>\n<\/ul>\n<p>CPU \u548c I\/O \u4e4b\u95f4\u5929\u7136\u5b58\u5728\u7740\u5dee\u5f02\uff0c\u7f51\u7edc\u4f20\u8f93\u7684\u5ef6\u65f6\u4e0d\u53ef\u63a7\uff0c\u6700\u7b80\u5355\u7684\u6a21\u578b\u4e0b\uff0c\u5982\u679c\u6709\u7ebf\u7a0b\u6216\u8005\u8fdb\u7a0b\u5728\u8c03\u7528 I\/O\uff0cI\/O \u6ca1\u54cd\u5e94\u65f6\uff0cCPU \u53ea\u80fd\u9009\u62e9\u6302\u8d77\uff0c\u7ebf\u7a0b\u6216\u8005\u8fdb\u7a0b\u4e5f\u88ab I\/O \u963b\u585e\u4f4f\u3002<\/p>\n<p>\u800c CPU \u8d44\u6e90\u5b9d\u8d35\uff0c\u8981\u8ba9 CPU \u5728\u8be5\u5fd9\u788c\u7684\u65f6\u5019\u5c3d\u91cf\u5fd9\u788c\u8d77\u6765\uff0c\u800c\u4e0d\u9700\u8981\u9891\u7e41\u5730\u6302\u8d77\u3001\u5524\u9192\u505a\u5207\u6362\uff0c\u540c\u65f6\u5f88\u591a\u5b9d\u8d35\u7684\u7ebf\u7a0b\u548c\u8fdb\u7a0b\u5360\u7528\u7cfb\u7edf\u8d44\u6e90\u4e5f\u5728\u505a\u65e0\u7528\u529f\u3002<\/p>\n<p>Socket I\/O \u53ef\u4ee5\u770b\u505a\u662f\u4e8c\u8005\u4e4b\u95f4\u7684\u6865\u6881\uff0c\u5982\u4f55\u66f4\u597d\u5730\u534f\u8c03\u4e8c\u8005\uff0c\u53bb\u6ee1\u8db3\u524d\u9762\u8bf4\u7684\u4e24\u70b9\u8981\u6c42\uff0c\u6709\u4e00\u4e9b\u6a21\u5f0f\uff08pattern\uff09\u662f\u53ef\u4ee5\u5e94\u7528\u7684\u3002<\/p>\n<p>RPC \u6846\u67b6\u53ef\u9009\u62e9\u7684 I\/O \u6a21\u578b\u4e25\u683c\u610f\u4e49\u4e0a\u6709 5 \u79cd\uff0c\u8fd9\u91cc\u4e0d\u8ba8\u8bba\u57fa\u4e8e <strong>\u4fe1\u53f7\u9a71\u52a8<\/strong> \u7684 I\/O\uff08Signal Driven I\/O\uff09\u3002\u8fd9\u51e0\u79cd\u6a21\u578b\u5728\u300aUNIX \u7f51\u7edc\u7f16\u7a0b\u300b\u4e2d\u5c31\u6709\u63d0\u5230\u4e86\uff0c\u5b83\u4eec\u5206\u522b\u662f\uff1a<\/p>\n<ol>\n<li><strong>\u4f20\u7edf\u7684\u963b\u585e I\/O<\/strong>\uff08Blocking I\/O\uff09<\/li>\n<li><strong>\u975e\u963b\u585e I\/O<\/strong>\uff08Non-blocking I\/O\uff09<\/li>\n<li><strong>I\/O \u591a\u8def\u590d\u7528<\/strong>\uff08I\/O multiplexing\uff09<\/li>\n<li><strong>\u5f02\u6b65 I\/O<\/strong>\uff08Asynchronous I\/O\uff09<\/li>\n<\/ol>\n<p>\u8fd9\u91cc\u4e0d\u7ec6\u8bf4\u6bcf\u79cd I\/O \u6a21\u578b\u3002\u8fd9\u91cc\u4e3e\u4e00\u4e2a\u5f62\u8c61\u7684\u4f8b\u5b50\uff0c\u8bfb\u8005\u5c31\u53ef\u4ee5\u9886\u4f1a\u8fd9\u56db\u79cd I\/O \u7684\u533a\u522b\uff0c\u5c31\u7528 <strong>\u94f6\u884c\u529e\u4e1a\u52a1<\/strong> \u8fd9\u4e2a\u751f\u6d3b\u7684\u573a\u666f\u63cf\u8ff0\u3002<\/p>\n<p>\u4e0b\u56fe\u662f\u4f7f\u7528 <strong>\u4f20\u7edf\u7684\u963b\u585e I\/O \u6a21\u578b<\/strong>\u3002\u4e00\u4e2a\u67dc\u5458\u670d\u52a1\u6240\u6709\u5ba2\u6237\uff0c\u53ef\u89c1\u5f53\u5ba2\u6237\u586b\u5199\u5355\u636e\u7684\u65f6\u5019\u4e5f\u5c31\u662f\u53d1\u751f\u7f51\u7edc I\/O \u7684\u65f6\u5019\uff0c\u67dc\u5458\uff0c\u4e5f\u5c31\u662f\u5b9d\u8d35\u7684\u7ebf\u7a0b\u6216\u8005\u8fdb\u7a0b\u5c31\u4f1a\u88ab\u963b\u585e\uff0c\u767d\u767d\u6d6a\u8d39\u4e86 CPU \u8d44\u6e90\uff0c\u65e0\u6cd5\u670d\u52a1\u540e\u9762\u7684\u8bf7\u6c42\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/res.infoq.com\/articles\/get-to-know-rpc\/zh\/resources\/243-1508862334949.jpg\" alt=\"\" data-src=\"articles\/get-to-know-rpc\/zh\/resources\/243-1508862334949.jpg\" \/><\/p>\n<p>\u4e0b\u56fe\u662f\u4e0a\u4e00\u4e2a\u7684\u8fdb\u5316\u7248\uff0c\u5982\u679c\u4e00\u4e2a\u67dc\u5458\u4e0d\u591f\uff0c\u90a3\u4e48\u5c31 <strong>\u5e76\u53d1\u5904\u7406<\/strong>\uff0c\u5bf9\u5e94\u91c7\u7528\u7ebf\u7a0b\u6c60\u6216\u8005\u591a\u8fdb\u7a0b\u65b9\u6848\uff0c\u4e00\u4e2a\u5ba2\u6237\u5bf9\u5e94\u4e00\u4e2a\u67dc\u5458\uff0c\u8fd9\u660e\u663e\u52a0\u5927\u4e86\u5e76\u53d1\u5ea6\uff0c\u5728\u5e76\u53d1\u4e0d\u9ad8\u7684\u60c5\u51b5\u4e0b\u6027\u80fd\u591f\u7528\uff0c\u4f46\u662f\u4ecd\u7136\u5b58\u5728\u67dc\u5458\u88ab I\/O \u963b\u585e\u7684\u53ef\u80fd\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/res.infoq.com\/articles\/get-to-know-rpc\/zh\/resources\/164-1508862334950.jpg\" alt=\"\" data-src=\"articles\/get-to-know-rpc\/zh\/resources\/164-1508862334950.jpg\" \/><\/p>\n<p>\u4e0b\u56fe\u662f <strong>I\/O \u591a\u8def\u590d\u7528<\/strong>\uff0c\u5b58\u5728\u4e00\u4e2a\u5927\u5802\u7ecf\u7406\uff0c\u76f8\u5f53\u4e8e\u4ee3\u7406\uff0c\u5b83\u6765\u8d1f\u8d23\u6240\u6709\u7684\u5ba2\u6237\uff0c\u53ea\u6709\u5f53\u5ba2\u6237\u5199\u597d\u5355\u636e\u540e\uff0c\u624d\u628a\u5ba2\u6237\u5206\u914d\u4e00\u4e2a\u67dc\u5458\u5904\u7406\uff0c\u53ef\u4ee5\u60f3\u8c61\u67dc\u5458\u4e0d\u7528\u963b\u585e\u5728 I\/O \u8bfb\u5199\u4e0a\uff0c\u8fd9\u6837\u67dc\u5458\u6548\u7387\u4f1a\u975e\u5e38\u9ad8\uff0c\u8fd9\u4e5f\u5c31\u662f I\/O \u591a\u8def\u590d\u7528\u7684\u7cbe\u9ad3\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/res.infoq.com\/articles\/get-to-know-rpc\/zh\/resources\/155-1508862334950.jpg\" alt=\"\" data-src=\"articles\/get-to-know-rpc\/zh\/resources\/155-1508862334950.jpg\" \/><\/p>\n<p>\u4e0b\u56fe\u662f <strong>\u5f02\u6b65 I\/O<\/strong>\uff0c\u5b8c\u5168\u4e0d\u5b58\u5728\u5927\u5802\u7ecf\u7406\uff0c\u94f6\u884c\u6709\u4e00\u4e2a\u5929\u7136\u7684\u201c<strong>\u9ad8\u7ea7\u7684\u5206\u914d\u673a\u5668<\/strong>\u201d\uff0c\u67dc\u5458\u6ce8\u518c\u81ea\u5df1\u8d1f\u8d23\u7684\u4e1a\u52a1\u7c7b\u578b\uff0c\u4f8b\u5982 I\/O \u53ef\u8bfb\uff0c\u90a3\u4e48\u7531\u8fd9\u4e2a\u201c\u9ad8\u7ea7\u7684\u673a\u5668\u201d\u8d1f\u8d23 I\/O \u8bfb\uff0c\u5f53\u53ef\u8bfb\u65f6\u5019\uff0c\u901a\u8fc7 <strong>\u56de\u8c03\u673a\u5236<\/strong>\uff0c\u628a\u5ba2\u6237\u5df2\u7ecf\u586b\u5199\u5b8c\u6bd5\u7684\u5355\u636e\u4e3b\u52a8\u4ea4\u7ed9\u67dc\u5458\uff0c\u56de\u8c03\u5176\u51fd\u6570\u5b8c\u6210\u64cd\u4f5c\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/res.infoq.com\/articles\/get-to-know-rpc\/zh\/resources\/76-1508862334956.jpg\" alt=\"\" data-src=\"articles\/get-to-know-rpc\/zh\/resources\/76-1508862334956.jpg\" \/><\/p>\n<p>\u91cd\u70b9\u8bf4\u4e0b\u9ad8\u6027\u80fd\uff0c\u5e76\u4e14\u5de5\u4e1a\u754c\u666e\u904d\u4f7f\u7528\u7684\u65b9\u6848\uff0c\u4e5f\u5c31\u662f\u540e\u4e24\u79cd\u3002<\/p>\n<h3>I\/O \u591a\u8def\u590d\u7528<\/h3>\n<p>\u57fa\u4e8e\u5185\u6838\uff0c\u5efa\u7acb\u5728 epoll \u6216\u8005 kqueue \u4e0a\u5b9e\u73b0\uff0cI\/O \u591a\u8def\u590d\u7528\u6700\u5927\u7684\u4f18\u52bf\u662f\u7528\u6237\u53ef\u4ee5\u5728\u4e00\u4e2a\u7ebf\u7a0b\u5185\u540c\u65f6\u5904\u7406\u591a\u4e2a Socket \u7684 I\/O \u8bf7\u6c42\u3002\u7528\u6237\u53ef\u4ee5\u8ba2\u9605\u4e8b\u4ef6\uff0c\u5305\u62ec\u6587\u4ef6\u63cf\u8ff0\u7b26\u6216\u8005 I\/O \u53ef\u8bfb\u3001\u53ef\u5199\u3001\u53ef\u8fde\u63a5\u4e8b\u4ef6\u7b49\u3002<\/p>\n<p>\u901a\u8fc7\u4e00\u4e2a\u7ebf\u7a0b\u76d1\u542c\u5168\u90e8\u7684 TCP \u8fde\u63a5\uff0c\u6709\u4efb\u4f55\u4e8b\u4ef6\u53d1\u751f\u5c31\u901a\u77e5\u7528\u6237\u6001\u5904\u7406\u5373\u53ef\uff0c\u8fd9\u4e48\u505a\u7684\u76ee\u7684\u5c31\u662f <strong>\u5047\u8bbe I\/O \u662f\u6162\u7684\uff0cCPU \u662f\u5feb\u7684<\/strong>\uff0c\u90a3\u4e48\u8981\u8ba9\u7528\u6237\u6001\u5c3d\u53ef\u80fd\u7684\u5fd9\u788c\u8d77\u6765\u53bb\uff0c\u4e5f\u5c31\u662f\u6700\u5927\u5316 CPU \u5229\u7528\u7387\uff0c\u907f\u514d\u4f20\u7edf\u7684 I\/O \u963b\u585e\u3002<\/p>\n<h3>\u5f02\u6b65 I\/O<\/h3>\n<p>\u8fd9\u91cc\u91cd\u70b9\u8bf4\u4e0b\u540c\u6b65 I\/O \u548c\u5f02\u6b65 I\/O\uff0c\u7406\u8bba\u4e0a\u524d\u4e09\u79cd\u6a21\u578b\u90fd\u53eb\u505a\u540c\u6b65 I\/O\uff0c\u540c\u6b65\u662f\u6307\u7528\u6237\u7ebf\u7a0b\u53d1\u8d77 I\/O \u8bf7\u6c42\u540e\u9700\u8981\u7b49\u5f85\u6216\u8005\u8f6e\u8be2\u5185\u6838 I\/O \u5b8c\u6210\u540e\u518d\u7ee7\u7eed\uff0c\u800c\u5f02\u6b65\u662f\u6307\u7528\u6237\u7ebf\u7a0b\u53d1\u8d77 I\/O \u8bf7\u6c42\u76f4\u63a5\u9000\u51fa\uff0c\u5f53\u5185\u6838 I\/O \u64cd\u4f5c\u5b8c\u6210\u540e\u4f1a\u901a\u77e5\u7528\u6237\u7ebf\u7a0b\u6765\u8c03\u7528\u5176\u56de\u8c03\u51fd\u6570\u3002<\/p>\n<h2>\u8fdb\u7a0b \/ \u7ebf\u7a0b\u6a21\u578b\uff08Thread\/Process Model\uff09<\/h2>\n<p>\u8fdb\u7a0b \/ \u7ebf\u7a0b\u6a21\u578b\u5f80\u5f80\u548c I\/O \u6a21\u578b\u6709\u8054\u7cfb\uff0c\u5f53 Socket I\/O \u53ef\u4ee5\u5f88\u9ad8\u6548\u7684\u5de5\u4f5c\u65f6\u5019\uff0c\u771f\u6b63\u7684\u4e1a\u52a1\u903b\u8f91\u5982\u4f55\u5229\u7528 CPU \u66f4\u5feb\u5730\u5904\u7406\u8bf7\u6c42\uff0c\u4e5f\u662f\u6709 pattern \u53ef\u5bfb\u7684\u3002\u8fd9\u91cc\u4e3b\u8981\u8bf4 Scalable I\/O \u4e00\u822c\u662f\u5982\u4f55\u505a\u7684\uff0c\u5b83\u7684 I\/O \u9700\u8981\u7ecf\u5386 5 \u4e2a\u73af\u8282\uff1a<\/p>\n<pre><code>Read -&gt; Decode -&gt; Compute -&gt; Encode -&gt; Send<\/code><\/pre>\n<p>\u4f7f\u7528\u4f20\u7edf\u7684\u963b\u585e I\/O + \u7ebf\u7a0b\u6c60\u7684\u65b9\u6848\uff08Multitasks\uff09\u4f1a\u9047 <strong>C10k\u95ee\u9898\u3002<\/strong><\/p>\n<p><a href=\"https:\/\/en.wikipedia.org\/wiki\/C10k_problem\"><strong>https:\/\/en.wikipedia.org\/wiki\/C10k_problem<\/strong><\/a><\/p>\n<p>\u4f46\u662f\u4e1a\u754c\u6709\u5f88\u591a\u5b9e\u73b0\u90fd\u662f\u8fd9\u4e2a\u65b9\u5f0f\uff0c\u6bd4\u5982 Java web \u5bb9\u5668 Tomcat\/Jetty \u7684\u9ed8\u8ba4\u914d\u7f6e\u5c31\u91c7\u7528\u8fd9\u4e2a\u65b9\u6848\uff0c\u53ef\u4ee5\u5de5\u4f5c\u5f97\u5f88\u597d\u3002<\/p>\n<p>\u4f46\u662f\u4ece I\/O \u6a21\u578b\u53ef\u4ee5\u770b\u51fa I\/O Blocking is killer to performance\uff0c\u5b83\u4f1a\u8ba9\u5de5\u4f5c\u7ebf\u7a0b\u5361\u5728 I\/O \u4e0a\uff0c\u800c\u4e00\u4e2a\u7cfb\u7edf\u5185\u90e8\u53ef\u4f7f\u7528\u7684\u7ebf\u7a0b\u6570\u91cf\u662f\u6709\u9650\u7684\uff08\u672c\u6587\u6682\u65f6\u4e0d\u8c08\u534f\u7a0b\u3001\u7ea4\u7a0b\u7684\u6982\u5ff5\uff09\uff0c\u6240\u4ee5\u624d\u6709\u4e86 I\/O \u591a\u8def\u590d\u7528\u548c\u5f02\u6b65 I\/O\u3002<\/p>\n<p><strong>I\/O \u591a\u8def\u590d\u7528\u5f80\u5f80\u5bf9\u5e94 Reactor \u6a21\u5f0f\uff0c\u5f02\u6b65 I\/O \u5f80\u5f80\u5bf9\u5e94 Proactor<\/strong>\u3002<\/p>\n<p>Reactor \u4e00\u822c\u4f7f\u7528 <strong>epoll+ \u4e8b\u4ef6\u9a71\u52a8<\/strong> \u7684\u7ecf\u5178\u6a21\u5f0f\uff0c\u901a\u8fc7 <strong>\u5206\u6cbb<\/strong> \u7684\u624b\u6bb5\uff0c\u628a\u8017\u65f6\u7684\u7f51\u7edc\u8fde\u63a5\u3001\u5b89\u5168\u8ba4\u8bc1\u3001\u7f16\u7801\u7b49\u5de5\u4f5c\u4ea4\u7ed9\u4e13\u95e8\u7684\u7ebf\u7a0b\u6c60\u6216\u8005\u8fdb\u7a0b\u53bb\u5b8c\u6210\uff0c\u7136\u540e\u518d\u53bb\u8c03\u7528\u771f\u6b63\u7684\u6838\u5fc3\u4e1a\u52a1\u903b\u8f91\u5c42\uff0c\u8fd9\u5728 *nix \u7cfb\u7edf\u4e2d\u88ab\u5e7f\u6cdb\u4f7f\u7528\u3002<\/p>\n<p>\u8457\u540d\u7684 Redis\u3001Nginx\u3001Node.js \u7684 Socket I\/O \u90fd\u7528\u7684\u8fd9\u4e2a\uff0c\u800c Java \u7684 NIO \u6846\u67b6 Netty \u4e5f\u662f\uff0cSpark 2.0 RPC \u6240\u4f9d\u8d56\u7684\u540c\u6837\u91c7\u7528\u4e86 Reactor \u6a21\u5f0f\u3002<\/p>\n<p>Proactor \u5728 *nix \u4e2d\u6ca1\u6709\u5f88\u597d\u7684\u5b9e\u73b0\uff0c\u4f46\u662f\u5728 Windows \u4e0a\u5927\u653e\u5f02\u5f69\uff08\u4f8b\u5982 IOCP \u6a21\u578b\uff09\u3002<\/p>\n<p>\u5173\u4e8e Reactor \u53ef\u4ee5\u53c2\u8003 <strong>Doug Lea \u7684 PPT<\/strong><\/p>\n<p><a href=\"http:\/\/gee.cs.oswego.edu\/dl\/cpjslides\/nio.pdf\"><strong>http:\/\/gee.cs.oswego.edu\/dl\/cpjslides\/nio.pdf<\/strong><\/a><\/p>\n<p>\u4ee5\u53ca <strong>\u8fd9\u7bc7 paper<\/strong><\/p>\n<p><a href=\"http:\/\/www.dre.vanderbilt.edu\/~schmidt\/PDF\/reactor-siemens.pdf\"><strong>http:\/\/www.dre.vanderbilt.edu\/~schmidt\/PDF\/reactor-siemens.pdf<\/strong><\/a><\/p>\n<p>\u5173\u4e8e Proactor \u53ef\u4ee5\u53c2\u8003 <strong>\u8fd9\u7bc7 paper<\/strong><\/p>\n<p><a href=\"http:\/\/www.cs.wustl.edu\/~schmidt\/PDF\/proactor.pdf\"><strong>http:\/\/www.cs.wustl.edu\/~schmidt\/PDF\/proactor.pdf<\/strong><\/a><\/p>\n<p>\u8bf4\u4e2a\u5177\u4f53\u7684\u4f8b\u5b50\uff0cThrift \u4f5c\u4e3a\u4e00\u4e2a\u878d\u5408\u4e86 <strong>\u5e8f\u5217\u5316 +RPC<\/strong> \u7684\u6846\u67b6\uff0c\u63d0\u4f9b\u4e86\u5f88\u591a\u79cd Server \u7684\u6784\u5efa\u9009\u9879\uff0c\u4ece\u540d\u79f0\u4e2d\u5c31\u53ef\u4ee5\u770b\u51fa\u4ed6\u4eec\u4f7f\u7528\u54ea\u79cd I\/O \u548c\u7ebf\u7a0b\u6a21\u578b\u3002<\/p>\n<p>(\u70b9\u51fb\u653e\u5927\u56fe\u50cf)<\/p>\n<p><a href=\"https:\/\/res.infoq.com\/articles\/get-to-know-rpc\/zh\/resources\/87-1508862334956.jpg\" class=\"gallery_colorbox\"><img decoding=\"async\" src=\"https:\/\/res.infoq.com\/articles\/get-to-know-rpc\/zh\/resources\/87-1508862334956.jpg\" alt=\"\" data-src=\"articles\/get-to-know-rpc\/zh\/resources\/87-1508862334956.jpg\"  \/><\/a><\/p>\n<h2>Schema \u548c\u5e8f\u5217\u5316\uff08Schema &amp; Data Serialization\uff09<\/h2>\n<p>\u5f53 I\/O \u5b8c\u6210\u540e\uff0c\u6570\u636e\u53ef\u4ee5\u7531\u7a0b\u5e8f\u5904\u7406\uff0c\u90a3\u4e48\u5982\u4f55\u8bc6\u522b\u8fd9\u4e9b\u4e8c\u8fdb\u5236\u7684\u6570\u636e\uff0c\u662f\u4e0b\u4e00\u6b65\u8981\u505a\u7684\u3002\u5e8f\u5217\u5316\u548c\u53cd\u5e8f\u5217\u5316\uff0c\u662f\u505a\u5bf9\u8c61\u5230\u4e8c\u8fdb\u5236\u6570\u636e\u7684\u8f6c\u6362\uff0c\u7a0b\u5e8f\u662f\u53ef\u4ee5\u7406\u89e3\u5bf9\u8c61\u7684\uff0c\u5bf9\u8c61\u4e00\u822c\u542b\u6709 schema \u6216\u8005\u7ed3\u6784\uff0c\u57fa\u4e8e\u8fd9\u4e9b\u8bed\u4e49\u6765\u505a\u7279\u5b9a\u7684\u4e1a\u52a1\u903b\u8f91\u5904\u7406\u3002<\/p>\n<p>\u8003\u5bdf\u4e00\u4e2a\u5e8f\u5217\u5316\u6846\u67b6\u4e00\u822c\u4f1a\u5173\u6ce8\u4ee5\u4e0b\u51e0\u70b9\uff1a<\/p>\n<ul>\n<li><strong>Encoding format<\/strong>\u3002\u662f human readable \u8fd8\u662f binary\u3002<\/li>\n<li><strong>Schema declaration<\/strong>\u3002\u4e5f\u53eb\u4f5c\u5951\u7ea6\u58f0\u660e\uff0c\u57fa\u4e8e IDL\uff0c\u6bd4\u5982 Protocol Buffers\/Thrift\uff0c\u8fd8\u662f\u81ea\u63cf\u8ff0\u7684\uff0c\u6bd4\u5982 JSON\u3001XML\u3002\u53e6\u5916\u8fd8\u9700\u8981\u770b\u662f\u5426\u662f\u5f3a\u7c7b\u578b\u7684\u3002<\/li>\n<li><strong>\u8bed\u8a00\u5e73\u53f0\u7684\u4e2d\u7acb\u6027<\/strong>\u3002\u6bd4\u5982 Java \u7684 Native Serialization \u5c31\u53ea\u80fd\u81ea\u5df1\u73a9\uff0c\u800c Protocol Buffers \u53ef\u4ee5\u8de8\u5404\u79cd\u8bed\u8a00\u548c\u5e73\u53f0\u3002<\/li>\n<li><strong>\u65b0\u8001\u5951\u7ea6\u7684\u517c\u5bb9\u6027<\/strong>\u3002\u6bd4\u5982 IDL \u52a0\u4e86\u4e00\u4e2a\u5b57\u6bb5\uff0c\u8001\u6570\u636e\u662f\u5426\u8fd8\u53ef\u4ee5\u53cd\u5e8f\u5217\u5316\u6210\u529f\u3002<\/li>\n<li><strong>\u548c\u538b\u7f29\u7b97\u6cd5\u7684\u5951\u5408\u5ea6<\/strong>\u3002\u8dd1 benchmark \u548c\u5b9e\u9645\u5e94\u7528\u90fd\u4f1a\u7ed3\u5408\u5404\u79cd\u538b\u7f29\u7b97\u6cd5\uff0c\u4f8b\u5982 gzip\u3001snappy\u3002<\/li>\n<li><strong>\u6027\u80fd<\/strong>\u3002\u8fd9\u662f\u6700\u91cd\u8981\u7684\uff0c\u5e8f\u5217\u5316\u3001\u53cd\u5e8f\u5217\u5316\u7684\u65f6\u95f4\uff0c\u5e8f\u5217\u5316\u540e\u6570\u636e\u7684\u5b57\u8282\u5927\u5c0f\u662f\u8003\u5bdf\u91cd\u70b9\u3002<\/li>\n<\/ul>\n<p>\u5e8f\u5217\u5316\u65b9\u5f0f\u975e\u5e38\u591a\uff0c\u5e38\u89c1\u7684\u6709 <strong>Protocol Buffers\uff0c Avro\uff0cThrift\uff0cXML\uff0cJSON\uff0cMessagePack\uff0cKyro\uff0cHessian\uff0cProtostuff\uff0cJava Native Serialize\uff0cFST<\/strong>\u3002<\/p>\n<p>\u4e0b\u9762\u8be6\u7ec6\u5c55\u5f00 Protocol Buffers\uff08\u7b80\u79f0 PB\uff09\uff0c\u770b\u770b\u4e3a\u4ec0\u4e48\u4f5c\u4e3a\u5de5\u4e1a\u754c\u7528\u5f97\u6700\u591a\u7684\u9ad8\u6027\u80fd\u5e8f\u5217\u5316\u7c7b\u5e93\uff0c\u597d\u5728\u54ea\u91cc\u3002<\/p>\n<p>\u9996\u5148\u53bb\u5b98\u7f51\u67e5\u770b\u5b83\u7684 <strong>Encoding format<\/strong><\/p>\n<p><a href=\"https:\/\/developers.google.com\/protocol-buffers\/docs\/encoding\"><strong>https:\/\/developers.google.com\/protocol-buffers\/docs\/encoding<\/strong><\/a><\/p>\n<p><strong>\u7d27\u51d1\u9ad8\u6548<\/strong> \u662f PB \u7684\u7279\u70b9\uff0c\u4f7f\u7528\u5b57\u6bb5\u7684\u5e8f\u53f7\u4f5c\u4e3a\u6807\u8bc6\uff0c\u800c\u4e0d\u662f\u5305\u540d\u7c7b\u540d\uff08Java \u7684 Native Serialization \u5e8f\u5217\u5316\u540e\u6570\u636e\u5927\u5c31\u5728\u4e8e\u4ec0\u4e48\u90fd\u4e00\u80a1\u8111\u653e\u8fdb\u53bb\uff09\uff0c\u4f7f\u7528 varint \u548c zigzag \u5bf9\u6574\u578b\u505a\u7279\u6b8a\u5904\u7406\u3002<\/p>\n<p>PB \u53ef\u4ee5\u8de8\u5404\u79cd\u8bed\u8a00\uff0c\u4f46\u662f\u524d\u63d0\u662f\u4f7f\u7528 IDL \u7f16\u5199\u63cf\u8ff0\u6587\u4ef6\uff0c\u7136\u540e codegen \u5de5\u5177\u751f\u6210\u5404\u79cd\u8bed\u8a00\u7684\u4ee3\u7801\u3002<\/p>\n<p>\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u6709\u4e2a Person \u5bf9\u8c61\uff0c\u5305\u542b\u5185\u5bb9\u5982\u4e0b\u56fe\u6240\u793a\uff0c\u7ecf\u8fc7 PB \u5e8f\u5217\u5316\u540e\u53ea\u6709 33 \u4e2a\u5b57\u8282\uff0c\u53ef\u4ee5\u5bf9\u6bd4 XML\u3001JSON \u6216\u8005 Java \u7684 Native Serialization \u90fd\u4f1a\u5927\u975e\u5e38\u591a\uff0c\u800c\u4e14\u5e8f\u5217\u5316\u3001\u53cd\u5e8f\u5217\u5316\u7684\u901f\u5ea6\u4e5f\u4e0d\u4f1a\u5f88\u597d\u3002\u8bb0\u4f4f\u8fd9\u4e2a\u6570\u636e\uff0c\u540e\u9762 demo \u7684\u65f6\u5019\u4f1a\u6709\u7528\u3002<\/p>\n<p>(\u70b9\u51fb\u653e\u5927\u56fe\u50cf)<\/p>\n<p><a href=\"https:\/\/res.infoq.com\/articles\/get-to-know-rpc\/zh\/resources\/98-1508862334957.jpg\" class=\"gallery_colorbox\"><img decoding=\"async\" src=\"https:\/\/res.infoq.com\/articles\/get-to-know-rpc\/zh\/resources\/98-1508862334957.jpg\" alt=\"\" data-src=\"articles\/get-to-know-rpc\/zh\/resources\/98-1508862334957.jpg\"  \/><\/a><\/p>\n<p>\u56fe\u7247\u6765\u6e90<\/p>\n<p><a href=\"https:\/\/www.slideshare.net\/SergeyPodolsky\/google-protocol-buffers-56085699\"><strong>https:\/\/www.slideshare.net\/SergeyPodolsky\/google-protocol-buffers-56085699<\/strong><\/a><\/p>\n<p>\u518d\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u4f7f\u7528 Thrift \u505a\u540c\u6837\u7684\u5e8f\u5217\u5316\uff0c\u91c7\u7528 Binary Protocol \u548c Compact Protocol \u7684\u5927\u5c0f\u662f\u4e0d\u4e00\u6837\u7684\uff0c\u4f46\u662f Compact Protocol \u548c PB \u867d\u7136\u5e8f\u5217\u5316\u7684\u7f16\u7801\u4e0d\u4e00\u6837\uff0c\u4f46\u662f\u540c\u6837\u662f\u975e\u5e38\u9ad8\u6548\u7684\u3002<\/p>\n<p>(\u70b9\u51fb\u653e\u5927\u56fe\u50cf)<\/p>\n<p><a href=\"https:\/\/res.infoq.com\/articles\/get-to-know-rpc\/zh\/resources\/49-1508862334962.jpg\" class=\"gallery_colorbox\"><img decoding=\"async\" src=\"https:\/\/res.infoq.com\/articles\/get-to-know-rpc\/zh\/resources\/49-1508862334962.jpg\" alt=\"\" data-src=\"articles\/get-to-know-rpc\/zh\/resources\/49-1508862334962.jpg\"  \/><\/a><\/p>\n<p>\u56fe\u7247\u6765\u6e90<\/p>\n<p><a href=\"https:\/\/www.slideshare.net\/SergeyPodolsky\/google-protocol-buffers-56085699\"><strong>https:\/\/www.slideshare.net\/SergeyPodolsky\/google-protocol-buffers-56085699<\/strong><\/a><\/p>\n<p>\u8fd9\u91cc\u7ed9\u4e00\u4e2a <strong>Uber \u505a\u7684\u5e8f\u5217\u5316\u6846\u67b6\u6bd4\u8f83<\/strong><\/p>\n<p><a href=\"https:\/\/eng.uber.com\/trip-data-squeeze\/\"><strong>https:\/\/eng.uber.com\/trip-data-squeeze\/<\/strong><\/a><\/p>\n<p>\u53ef\u4ee5\u770b\u51fa Protocol Buffers \u548c Thrift \u90fd\u662f\u540d\u5217\u524d\u8305\u7684\uff0c\u4f46\u662f\u8fd9\u4e9b benchmark \u770b\u770b\u5c31\u597d\uff0c\u77e5\u9053\u4e2a\u5927\u6982\uff0c\u6ca1\u5fc5\u8981\u7ec6\u7a76\uff0c\u56e0\u4e3a\u6837\u672c\u6570\u636e\u3001\u6d4b\u8bd5\u73af\u5883\u3001\u7248\u672c\u7b49\u90fd\u53ef\u80fd\u4f1a\u5f71\u54cd\u7ed3\u679c\u3002<\/p>\n<h2>\u534f\u8bae\u7ed3\u6784\uff08Wire Protocol\uff09<\/h2>\n<p>Socket \u8303\u7574\u91cc\u8ba8\u8bba\u7684\u5305\u53eb\u505a Frame\u3001Packet\u3001Segment \u90fd\u6ca1\u9519\uff0c\u4f46\u662f\u4e00\u822c\u628a\u8fd9\u4e9b\u5206\u522b\u6620\u5c04\u4e3a\u6570\u636e\u94fe\u8def\u5c42\u3001IP \u5c42\u548c TCP \u5c42\u7684\u6570\u636e\u5305\uff0c\u5e94\u7528\u5c42\u7684\u6682\u65f6\u6ca1\u6709\uff0c\u6240\u4ee5\u4e0b\u6587\u4e0d\u5fc5\u8ba1\u8f83\u5305\u600e\u4e48\u7ffb\u8bd1\u3002<\/p>\n<p><strong>\u534f\u8bae\u7ed3\u6784<\/strong>\uff0c\u82f1\u6587\u53eb\u505a wire protocol \u6216\u8005 wire format\u3002TCP \u53ea\u662f binary stream \u901a\u9053\uff0c\u662f binary \u6570\u636e\u7684\u53ef\u9760\u642c\u7528\u5de5\uff0c\u5b83\u4e0d\u61c2 RPC \u91cc\u9762\u5305\u88c5\u7684\u662f\u4ec0\u4e48\u3002\u800c\u5728\u4e00\u4e2a\u901a\u9053\u4e0a\u4f20\u8f93 message\uff0c\u52bf\u5fc5\u6d89\u53ca message \u7684\u8bc6\u522b\u3002<\/p>\n<p>\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u6b63\u5982\u4e0b\u56fe\u4e2d\u7684\u4f8b\u5b50\uff0cABC+DEF+GHI \u5206 3 \u4e2a message\uff0c\u4e5f\u5c31\u662f\u5206 3 \u4e2a Frame \u53d1\u9001\u51fa\u53bb\uff0c\u800c\u63a5\u6536\u7aef\u5206\u56db\u6b21\u6536\u5230 4 \u4e2a Frame\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/res.infoq.com\/articles\/get-to-know-rpc\/zh\/resources\/761-1508899308112.png\" alt=\"\" data-src=\"articles\/get-to-know-rpc\/zh\/resources\/761-1508899308112.png\" \/><\/p>\n<p>Socket I\/O \u7684\u5de5\u4f5c\u5b8c\u6210\u5f97\u5f88\u597d\uff0c\u53ef\u9760\u5730\u4f20\u8f93\u8fc7\u53bb\uff0c\u8fd9\u662f TCP \u534f\u8bae\u4fdd\u8bc1\u7684\uff0c\u4f46\u662f\u63a5\u6536\u5230\u7684\u662f 4 \u4e2a Frame\uff0c\u4e0d\u662f\u539f\u672c\u53d1\u9001\u7684 3 \u4e2a message \u5bf9\u5e94\u7684 3 \u4e2a Frame\u3002<\/p>\n<p>\u8fd9\u79cd\u60c5\u51b5\u53eb\u505a\u53d1\u751f\u4e86 <strong>TCP \u7c98\u5305\u548c\u534a\u5305<\/strong> \u73b0\u8c61\uff0cAB\u3001H\u3001I \u7684\u60c5\u51b5\u53eb\u505a\u534a\u5305\uff0cCDEFG \u7684\u60c5\u51b5\u53eb\u505a\u7c98\u5305\u3002\u867d\u7136\u987a\u5e8f\u662f\u5bf9\u7684\uff0c\u4f46\u662f\u5206\u7ec4\u5b8c\u5168\u548c\u4e4b\u524d\u5bf9\u5e94\u4e0d\u4e0a\u3002<\/p>\n<p>\u8fd9\u65f6\u5019\u5e94\u7528\u5c42\u5982\u4f55\u505a\u8bed\u4e49\u7ea7\u522b\u7684 message \u8bc6\u522b\u662f\u4e2a\u95ee\u9898\uff0c\u53ea\u6709\u505a\u597d\u4e86\u534f\u8bae\u7684\u7ed3\u6784\uff0c\u624d\u80fd\u628a\u4e00\u6574\u4e2a\u6570\u636e\u7247\u6bb5\u505a\u5e8f\u5217\u5316\u6216\u8005\u53cd\u5e8f\u5217\u5316\u5904\u7406\u3002<\/p>\n<p>\u4e00\u822c\u91c7\u7528\u7684\u65b9\u5f0f\u6709\u4e09\u79cd\uff1a<\/p>\n<p><strong>\u65b9\u5f0f 1\uff1a\u5206\u9694\u7b26<\/strong>\u3002<\/p>\n<p><strong>\u65b9\u5f0f 2\uff1a\u6362\u884c\u7b26<\/strong>\u3002\u6bd4\u5982 memcache \u7531\u5ba2\u6237\u7aef\u53d1\u9001\u7684\u547d\u4ee4\u4f7f\u7528\u7684\u662f\u6587\u672c\u884c\\r\\n \u505a\u4e3a mesage \u7684\u5206\u9694\u7b26\uff0c\u7ec4\u7ec7\u6210\u4e00\u4e2a\u6709\u610f\u4e49\u7684 message\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/res.infoq.com\/articles\/get-to-know-rpc\/zh\/resources\/252-1508899308104.jpg\" alt=\"\" data-src=\"articles\/get-to-know-rpc\/zh\/resources\/252-1508899308104.jpg\" \/><\/p>\n<p>\u56fe\u7247\u6765\u6e90<\/p>\n<p><a href=\"https:\/\/www.kancloud.cn\/kancloud\/essential-netty-in-action\/52643\"><strong>https:\/\/www.kancloud.cn\/kancloud\/essential-netty-in-action\/52643<\/strong><\/a><\/p>\n<p>\u56fe\u4e2d\u7684\u8bf4\u660e\uff1a<\/p>\n<ol>\n<li>\u5b57\u8282\u6d41<\/li>\n<li>\u7b2c\u4e00\u5e27<\/li>\n<li>\u7b2c\u4e8c\u5e27<\/li>\n<\/ol>\n<p><strong>\u65b9\u5f0f 3\uff1a\u56fa\u5b9a\u957f\u5ea6<\/strong>\u3002RPC \u7ecf\u5e38\u91c7\u7528\u8fd9\u79cd\u65b9\u5f0f\uff0c\u4f7f\u7528 header+payload \u7684\u65b9\u5f0f\u3002<\/p>\n<p>\u6bd4\u5982 HTTP \u534f\u8bae\uff0c\u5efa\u7acb\u5728 TCP \u4e4b\u4e0a\u6700\u5e7f\u6cdb\u4f7f\u7528\u7684 RPC\uff0cHTTP \u5934\u4e2d\u80af\u5b9a\u6709\u4e00\u4e2a body length \u544a\u77e5\u5e94\u7528\u5c42\u5982\u4f55\u53bb\u8bfb\u61c2\u4e00\u4e2a message\uff0c\u505a HTTP \u5305\u7684\u8bc6\u522b\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/res.infoq.com\/articles\/get-to-know-rpc\/zh\/resources\/612-1508862334962.jpg\" alt=\"\" data-src=\"articles\/get-to-know-rpc\/zh\/resources\/612-1508862334962.jpg\" \/><\/p>\n<p>\u5728 HTTP\/2 \u534f\u8bae\u4e2d\uff0c\u8be6\u7ec6\u89c1 <strong>Hypertext Transfer Protocol Version 2 (HTTP\/2)<\/strong><\/p>\n<p><a href=\"https:\/\/tools.ietf.org\/html\/rfc7540\"><strong>https:\/\/tools.ietf.org\/html\/rfc7540<\/strong><\/a><\/p>\n<p>\u867d\u7136\u7cbe\u7b80\u4e86\u5f88\u591a\uff0c\u52a0\u5165\u4e86\u6d41\u7684\u6982\u5ff5\uff0c\u4f46\u662f header+payload \u7684\u65b9\u5f0f\u662f\u7edd\u5bf9\u4e0d\u80fd\u53d8\u7684\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/res.infoq.com\/articles\/get-to-know-rpc\/zh\/resources\/253-1508899308106.jpg\" alt=\"\" data-src=\"articles\/get-to-know-rpc\/zh\/resources\/253-1508899308106.jpg\" \/><\/p>\n<p>\u56fe\u7247\u6765\u6e90<\/p>\n<p><a href=\"https:\/\/tools.ietf.org\/html\/rfc7540\"><strong>https:\/\/tools.ietf.org\/html\/rfc7540<\/strong><\/a><\/p>\n<p>\u4e0b\u9762\u5c55\u793a\u7684\u662f\u4f5c\u8005\u81ea\u7814\u7684\u4e00\u4e2a RPC \u6846\u67b6\uff0c\u53ef\u4ee5\u5728 github \u4e0a\u627e\u5230\u8fd9\u4e2a\u5de5\u7a0b<\/p>\n<p><strong>neoremind\/navi-pbrpc<\/strong>\uff1a<\/p>\n<p><a href=\"https:\/\/github.com\/neoremind\/navi-pbrpc\"><strong>https:\/\/github.com\/neoremind\/navi-pbrpc<\/strong><\/a><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/res.infoq.com\/articles\/get-to-know-rpc\/zh\/resources\/514-1508862334957.jpg\" alt=\"\" data-src=\"articles\/get-to-know-rpc\/zh\/resources\/514-1508862334957.jpg\" \/><\/p>\n<p>\u53ef\u4ee5\u770b\u51fa\u5b83\u7684\u534f\u8bae\u6808 header+payload \u65b9\u5f0f\u7684\uff0cheader \u56fa\u5b9a 36 \u4e2a\u5b57\u8282\u957f\u5ea6\uff0c\u6700\u540e 4 \u4e2a\u5b57\u8282\u662f body length\uff0c\u4e5f\u5c31\u662f payload length\uff0c\u53ef\u4ee5\u4f7f\u7528\u5927\u5c3e\u7aef\u6216\u8005\u5c0f\u5c3e\u7aef\u7f16\u7801\u3002<\/p>\n<h2>\u53ef\u9760\u6027\uff08Reliability\uff09<\/h2>\n<p>RPC \u6846\u67b6\u4e0d\u5149\u8981\u5904\u7406 Network I\/O\u3001\u5e8f\u5217\u5316\u3001\u534f\u8bae\u6808\u3002\u8fd8\u6709\u5f88\u591a\u4e0d\u786e\u5b9a\u6027\u95ee\u9898\u8981\u5904\u7406\uff0c\u8fd9\u91cc\u7684\u4e0d\u786e\u5b9a\u6027\u5c31\u662f\u7531 <strong>\u7f51\u7edc\u7684\u4e0d\u53ef\u9760<\/strong> \u5e26\u6765\u7684\u9ebb\u70e6\u3002<\/p>\n<p>\u4f8b\u5982\u5982\u4f55\u4fdd\u6301\u957f\u8fde\u63a5\u5fc3\u8df3\uff1f\u7f51\u7edc\u95ea\u65ad\u600e\u4e48\u529e\uff1f\u91cd\u8fde\u3001\u91cd\u4f20\uff1f\u8fde\u63a5\u8d85\u65f6\uff1f\u8fd9\u4e9b\u90fd\u975e\u5e38\u7684\u7ec6\u788e\u548c\u9ebb\u70e6\uff0c\u6240\u4ee5\u8bf4\u5f00\u53d1\u597d\u4e00\u4e2a\u7a33\u5b9a\u7684 RPC \u7c7b\u5e93\u662f\u4e00\u4e2a\u975e\u5e38\u7cfb\u7edf\u548c\u7ec6\u5fc3\u7684\u5de5\u7a0b\u3002<\/p>\n<p>\u4f46\u662f\u597d\u5728\u5de5\u4e1a\u754c\u6709\u4e00\u7fa4\u4eba\u5c31\u81f4\u529b\u4e8e\u63d0\u4f9b\u5e73\u53f0\u4f3c\u7684\u89e3\u51b3\u65b9\u6848\uff0c\u4f8b\u5982 Java \u4e2d\u7684 Netty\uff0c\u5b83\u662f\u4e00\u4e2a\u5f3a\u5927\u7684\u5f02\u6b65\u3001\u4e8b\u4ef6\u9a71\u52a8\u7684\u7f51\u7edc I\/O \u5e93\uff0c\u4f7f\u7528 I\/O \u591a\u8def\u590d\u7528\u7684\u6a21\u578b\uff0c\u505a\u597d\u4e86\u4e0a\u8ff0\u7684\u9ebb\u70e6\u5904\u7406\u3002<\/p>\n<p>\u5b83\u662f\u9762\u5411\u5bf9\u8c61\u8bbe\u8ba1\u6a21\u5f0f\u7684\u96c6\u5927\u6210\u8005\uff0c\u4f7f\u7528\u65b9\u53ea\u9700\u8981\u4f1a\u4f7f\u7528 Netty \u7684\u5404\u79cd\u7c7b\uff0c\u8fdb\u884c\u6269\u5c55\u3001\u7ec4\u5408\u3001\u63d2\u62d4\uff0c\u5c31\u53ef\u4ee5\u5b8c\u6210\u4e00\u4e2a\u9ad8\u6027\u80fd\u3001\u53ef\u9760\u7684 RPC \u6846\u67b6\u3002<\/p>\n<p>\u8457\u540d\u7684 gRPC Java \u7248\u672c\u3001Twitter \u7684 Finagle \u6846\u67b6\u3001\u963f\u91cc\u5df4\u5df4\u7684 Dubbo\u3001\u65b0\u6d6a\u5fae\u535a\u7684 Motan\u3001Spark 2.0 RPC \u7684\u7f51\u7edc\u5c42\uff08\u53ef\u4ee5\u53c2\u8003 <strong>kraps-rpc<\/strong>\uff1a<a href=\"https:\/\/github.com\/neoremind\/kraps-rpc\"><strong>https:\/\/github.com\/neoremind\/kraps-rpc<\/strong><\/a>\uff09\u90fd\u91c7\u7528\u4e86\u8fd9\u4e2a\u7c7b\u5e93\u3002<\/p>\n<h2>\u6613\u7528\u6027\uff08Ease of use\uff09<\/h2>\n<p>RPC \u662f\u9700\u8981\u8ba9\u4e0a\u5c42\u5199\u4e1a\u52a1\u903b\u8f91\u6765\u5b9e\u73b0\u529f\u80fd\u7684\uff0c\u5982\u4f55\u4f18\u96c5\u5730\u542f\u505c\u4e00\u4e2a server\uff0c\u6ce8\u5165 endpoint\uff0c\u5ba2\u6237\u7aef\u600e\u4e48\u8fde\uff0c\u91cd\u8bd5\u8c03\u7528\uff0c\u8d85\u65f6\u63a7\u5236\uff0c\u540c\u6b65\u5f02\u6b65\u8c03\u7528\uff0cSDK \u662f\u5426\u9700\u8981\u4ea4\u6362\u7b49\u7b49\uff0c\u90fd\u51b3\u5b9a\u4e86\u57fa\u4e8e RPC \u6784\u5efa\u670d\u52a1\uff0c\u751a\u81f3 SOA \u7684\u5de5\u7a0b\u6548\u7387\u4e0e\u751f\u4ea7\u529b\u9ad8\u4f4e\u3002\u8fd9\u91cc\u4e0d\u505a\u5c55\u5f00\uff0c\u770b\u5404\u79cd RPC \u7684\u6587\u6863\u5c31\u77e5\u9053\u4ed6\u4eec\u7684\u6613\u7528\u6027\u5982\u4f55\u4e86\u3002<\/p>\n<h2>\u5de5\u4e1a\u754c\u7684 RPC \u6846\u67b6\u4e00\u89c8<\/h2>\n<h3>\u56fd\u5185<\/h3>\n<ul>\n<li><strong>Dubbo<\/strong>\u3002\u6765\u81ea\u963f\u91cc\u5df4\u5df4 <a href=\"http:\/\/dubbo.I\/O\/\">http:\/\/dubbo.I\/O\/<\/a><\/li>\n<li><strong>Motan<\/strong>\u3002\u65b0\u6d6a\u5fae\u535a\u81ea\u7528 <a href=\"https:\/\/github.com\/weibocom\/motan\">https:\/\/github.com\/weibocom\/motan<\/a><\/li>\n<li><strong>Dubbox<\/strong>\u3002\u5f53\u5f53\u57fa\u4e8e dubbo \u7684 <a href=\"https:\/\/github.com\/dangdangdotcom\/dubbox\">https:\/\/github.com\/dangdangdotcom\/dubbox<\/a><\/li>\n<li><strong>rpcx<\/strong>\u3002\u57fa\u4e8e Golang \u7684 <a href=\"https:\/\/github.com\/smallnest\/rpcx\">https:\/\/github.com\/smallnest\/rpcx<\/a><\/li>\n<li><strong>Navi &amp; Navi-pbrpc<\/strong>\u3002\u4f5c\u8005\u5f00\u6e90\u7684 <a href=\"https:\/\/github.com\/neoremind\/navi\">https:\/\/github.com\/neoremind\/navi<\/a> <a href=\"https:\/\/github.com\/neoremind\/navi-pbrpc\">https:\/\/github.com\/neoremind\/navi-pbrpc<\/a><\/li>\n<\/ul>\n<h3>\u56fd\u5916<\/h3>\n<ul>\n<li><strong>Thrift from facebook<\/strong> <a href=\"https:\/\/thrift.apache.org\">https:\/\/thrift.apache.org<\/a><\/li>\n<li><strong>Avro from hadoop<\/strong> <a href=\"https:\/\/avro.apache.org\">https:\/\/avro.apache.org<\/a><\/li>\n<li><strong>Finagle by twitter<\/strong> <a href=\"https:\/\/twitter.github.I\/O\/finagle\">https:\/\/twitter.github.I\/O\/finagle<\/a><\/li>\n<li><strong>gRPC by Google<\/strong> <a href=\"http:\/\/www.grpc.I\/O\">http:\/\/www.grpc.I\/O<\/a> (Google inside use Stuppy)<\/li>\n<li><strong>Hessian from cuacho<\/strong> <a href=\"http:\/\/hessian.caucho.com\">http:\/\/hessian.caucho.com<\/a><\/li>\n<li><strong>Coral Service inside amazon<\/strong> (not open sourced)<\/li>\n<\/ul>\n<p>\u4e0a\u8ff0\u5217\u51fa\u6765\u7684\u90fd\u662f\u73b0\u5728\u4e92\u8054\u7f51\u4f01\u4e1a\u5e38\u7528\u7684\u89e3\u51b3\u65b9\u6848\uff0c\u6682\u65f6\u4e0d\u8003\u8651\u4f20\u7edf\u7684 SOAP\uff0cXML-RPC \u7b49\u3002\u8fd9\u4e9b\u662f\u6709\u7f51\u7edc\u8d44\u6599\u7684\uff0c\u5b9e\u9645\u4e0a\u5f88\u591a\u516c\u53f8\u5185\u90e8\u90fd\u4f1a\u9488\u5bf9\u81ea\u5df1\u7684\u4e1a\u52a1\u573a\u666f\uff0c\u4ee5\u53ca\u548c\u516c\u53f8\u5185\u7684\u5e73\u53f0\u76f8\u878d\u5408\uff08\u6bd4\u5982\u76d1\u63a7\u5e73\u53f0\u7b49\uff09\uff0c\u81ea\u7814\u4e00\u5957\u6846\u67b6\uff0c\u4f46\u662f\u6b8a\u9014\u540c\u5f52\uff0c\u90fd\u9003\u4e0d\u6389\u521a\u521a\u4e0a\u9762\u6240\u5217\u4e3e\u7684 RPC \u7684\u8981\u8003\u8651\u7684\u5404\u4e2a\u90e8\u5206\u3002<\/p>\n<h2>Demo \u5c55\u793a<\/h2>\n<p>\u4e3a\u4e86\u4f7f\u8bfb\u8005\u66f4\u597d\u5730\u7406\u89e3\u4e0a\u9762\u6240\u8ff0\u7684\u5404\u4e2a\u7ae0\u8282\uff0c\u4e0b\u9762\u505a\u4e00\u4e2a\u7b80\u5355\u4f8b\u5b50\u5206\u6790\u3002\u4f7f\u7528\u00a0<strong>neoremind\/navi-pbrpc<\/strong>\uff1a<a href=\"https:\/\/github.com\/neoremind\/navi-pbrpc\"><strong>https:\/\/github.com\/neoremind\/navi-pbrpc<\/strong><\/a> \u6765\u505a demo\uff0c\u4f7f\u7528 Java \u8bed\u8a00\u6765\u5f00\u53d1\u3002<\/p>\n<p>\u5047\u8bbe\u8981\u5f00\u53d1\u4e00\u4e2a\u670d\u52a1\u7aef\u548c\u5ba2\u6237\u7aef\uff0c\u670d\u52a1\u7aef\u63d0\u4f9b\u4e00\u4e2a\u8bf7\u6c42\u54cd\u5e94\u63a5\u53e3\uff0c\u8bf7\u6c42\u662f <strong>user_id<\/strong>\uff0c\u54cd\u5e94\u662f\u4e00\u4e2a user \u7684\u6570\u636e\u7ed3\u6784\u5bf9\u8c61\u3002<\/p>\n<p>\u9996\u5148\u5b9a\u4e49\u4e00\u4e2a IDL\uff0c\u4f7f\u7528 PB \u6765\u505a Schema \u58f0\u660e\uff0cIDL \u63cf\u8ff0\u5982\u4e0b\uff0c\u7b2c\u4e00\u4e2a Request \u662f\u8bf7\u6c42\uff0c\u7b2c\u4e8c\u4e2a Person \u662f\u54cd\u5e94\u7684\u5bf9\u8c61\u7ed3\u6784\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/res.infoq.com\/articles\/get-to-know-rpc\/zh\/resources\/515-1508862334962.jpg\" alt=\"\" data-src=\"articles\/get-to-know-rpc\/zh\/resources\/515-1508862334962.jpg\" \/><\/p>\n<p>\u7136\u540e\u4f7f\u7528 codegen \u751f\u6210\u5bf9\u5e94\u7684\u4ee3\u7801\uff0c\u4f8b\u5982\u751f\u6210\u4e86 PersonPB.Request \u548c PersonPB.Person \u4e24\u4e2a class\u3002<\/p>\n<p>server \u7aef\u9700\u8981\u5f00\u53d1\u8bf7\u6c42\u54cd\u5e94\u63a5\u53e3\uff0cAPI \u662f <strong>PersonPB.Person doSmth(PersonPB.Request req)<\/strong>\uff0c\u5b9e\u73b0\u5982\u4e0b\uff0c\u5305\u542b\u4e00\u4e2a Interface \u548c\u4e00\u4e2a\u5b9e\u73b0 class\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/res.infoq.com\/articles\/get-to-know-rpc\/zh\/resources\/611-1508900621842.jpg\" alt=\"\" data-src=\"articles\/get-to-know-rpc\/zh\/resources\/611-1508900621842.jpg\" \/><\/p>\n<p>server \u8fd4\u56de\u7684\u662f\u4e00\u4e2a Person \u5bf9\u8c61\uff0c\u91cc\u9762\u7684\u5185\u5bb9\u4e3b\u8981\u5c31\u662f\u4e0a\u9762\u8bb2\u5230\u7684 PB \u4f8b\u5b50\u91cc\u9762\u7684\u3002<\/p>\n<p>\u542f\u52a8 server\u3002\u5728 8098 \u7aef\u53e3\u5f00\u542f\u670d\u52a1\uff0c\u5ba2\u6237\u7aef\u9700\u8981\u9760 id=100 \u8fd9\u4e2a\u6807\u8bc6\u6765\u8def\u7531\u5230\u8fd9\u4e2a\u670d\u52a1\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/res.infoq.com\/articles\/get-to-know-rpc\/zh\/resources\/517-1508862874794.jpg\" alt=\"\" data-src=\"articles\/get-to-know-rpc\/zh\/resources\/517-1508862874794.jpg\" \/><\/p>\n<p>\u81f3\u6b64\uff0c\u670d\u52a1\u7aef\u5f00\u53d1\u5b8c\u6bd5\uff0c\u53ef\u4ee5\u770b\u51fa\u4f7f\u7528\u4e00\u4e2a\u5b8c\u5584\u7684 RPC \u6846\u67b6\uff0c\u53ea\u9700\u8981\u5b9a\u4e49\u597d Schema \u548c\u4e1a\u52a1\u903b\u8f91\u5c31\u53ef\u4ee5\u53d1\u5e03\u4e00\u4e2a RPC\uff0c\u800c I\/O model\u3001\u7ebf\u7a0b\u6a21\u578b\u3001\u5e8f\u5217\u5316 \/ \u53cd\u5e8f\u5217\u5316\u3001\u534f\u8bae\u7ed3\u6784\u5747\u7531\u6846\u67b6\u670d\u52a1\u3002<\/p>\n<p>navi-pbrpc \u5e95\u5c42\u4f7f\u7528 Netty\uff0c\u5728 Linux \u4e0b\u4f1a\u4f7f\u7528 epoll \u505a I\/O \u591a\u8def\u590d\u7528\uff0c\u7ebf\u7a0b\u6a21\u578b\u9ed8\u8ba4\u91c7\u7528 Reactor \u6a21\u5f0f\uff0c\u5e8f\u5217\u5316\u548c\u53cd\u5e8f\u5217\u5316\u4f7f\u7528 PB\uff0c\u534f\u8bae\u7ed3\u6784\u89c1\u4e0a\u6587\u90e8\u5206\u4ecb\u7ecd\u7684\uff0c\u662f\u4e00\u4e2a\u6807\u51c6\u7684 header+payload \u7ed3\u6784\u3002<\/p>\n<p>\u4e0b\u9762\u5f00\u53d1\u4e00\u4e2a client\uff0c\u8c03\u7528\u521a\u521a\u5f00\u53d1\u7684 RPC\u3002<\/p>\n<p>client \u7aef\u4ee3\u7801\u5b9e\u73b0\u5982\u4e0b\u3002\u9996\u5148\u6784\u9020 PbrpcClient\uff0c\u7136\u540e\u6784\u9020 PersonPB.Request\uff0c\u4e5f\u5c31\u662f\u8bf7\u6c42\uff0c\u8bbe\u7f6e\u597d user_id\uff0c\u6784\u9020 PbrpcMsg \u4f5c\u4e3a TCP \u5c42\u4f20\u8f93\u7684\u6570\u636e payload\uff0c\u8fd9\u5c31\u662f\u534f\u8bae\u7ed3\u6784\u4e2d\u7684 body \u90e8\u5206\u3002<\/p>\n<p>\u901a\u8fc7 asyncTransport \u8fdb\u884c\u901a\u4fe1\uff0c\u8fd4\u56de\u4e00\u4e2a Future \u53e5\u67c4\uff0c\u901a\u8fc7 Future.get \u963b\u585e\u83b7\u53d6\u7ed3\u679c\u5e76\u4e14\u6253\u5370\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/res.infoq.com\/articles\/get-to-know-rpc\/zh\/resources\/712-1508900621837.jpg\" alt=\"\" data-src=\"articles\/get-to-know-rpc\/zh\/resources\/712-1508900621837.jpg\" \/><\/p>\n<p>\u81f3\u6b64\uff0c\u53ef\u4ee5\u770b\u51fa\u4f5c\u4e3a\u4e00\u4e2a RPC client \u6613\u7528\u6027\u662f\u5f88\u7b80\u5355\u7684\uff0c\u540c\u65f6\u53ef\u9760\u6027\uff0c\u4f8b\u5982\u91cd\u8bd5\u7b49\u4f1a\u7531 navi-pbrpc \u6846\u67b6\u8d1f\u8d23\u5b8c\u6210\uff0c\u7528\u6237\u53ea\u9700\u8981\u805a\u7126\u5230\u771f\u6b63\u7684\u4e1a\u52a1\u903b\u8f91\u5373\u53ef\u3002<\/p>\n<p>\u4e0b\u9762\u7ee7\u7eed\u6df1\u5165\u5230 binary stream \u7ea7\u522b\u89c2\u5bdf\uff0c\u4f7f\u7528\u55c5\u63a2\u5de5\u5177\u6765\u770b\u770b TCP \u5305\u3002\u4e00\u822c\u4f7f\u7528 <strong>wireshark<\/strong> \u6216\u8005 <strong>tcpdump<\/strong>\u3002<\/p>\n<p>\u5ba2\u6237\u7aef\u7684\u4e00\u6b21\u8bf7\u6c42\u8c03\u7528\u5982\u4e0b\u56fe\u6240\u793a\uff0c\u7b2c\u4e00\u4e2a\u5305\u5c31\u662f TCP \u4e09\u6b21\u63e1\u624b\u7684 SYN \u5305\u3002<\/p>\n<p>(\u70b9\u51fb\u653e\u5927\u56fe\u50cf)<\/p>\n<p><a href=\"https:\/\/res.infoq.com\/articles\/get-to-know-rpc\/zh\/resources\/519-1508862874795.jpg\" class=\"gallery_colorbox\"><img decoding=\"async\" src=\"https:\/\/res.infoq.com\/articles\/get-to-know-rpc\/zh\/resources\/519-1508862874795.jpg\" alt=\"\" data-src=\"articles\/get-to-know-rpc\/zh\/resources\/519-1508862874795.jpg\"  \/><\/a><\/p>\n<p>\u6839\u636e TCP \u5934\u534f\u8bae\uff0c\u53ef\u770b\u51fa\u6765\u3002<\/p>\n<ul>\n<li>ff 15 = 65301 \u662f\u5ba2\u6237\u7aef\u7684\u7aef\u53e3<\/li>\n<li>1f a2 = 8098 \u662f\u670d\u52a1\u7aef\u7684\u7aef\u53e3<\/li>\n<li>header \u7684\u957f\u5ea6 44 \u5b57\u8282\u662f 20 \u5b57\u8282\u5934 +20 \u5b57\u8282 option+padding \u6784\u6210\u7684\u3002<\/li>\n<\/ul>\n<p>\u4e09\u6b21\u63e1\u624b\u6210\u529f\u540e\uff0c\u4e0b\u9762\u5ba2\u6237\u7aef\u53d1\u8d77\u4e86 RPC \u8bf7\u6c42\uff0c\u5982\u4e0b\u56fe\u6240\u793a\u3002<\/p>\n<p>(\u70b9\u51fb\u653e\u5927\u56fe\u50cf)<\/p>\n<p><a href=\"https:\/\/res.infoq.com\/articles\/get-to-know-rpc\/zh\/resources\/520-1508862874795.jpg\" class=\"gallery_colorbox\"><img decoding=\"async\" src=\"https:\/\/res.infoq.com\/articles\/get-to-know-rpc\/zh\/resources\/520-1508862874795.jpg\" alt=\"\" data-src=\"articles\/get-to-know-rpc\/zh\/resources\/520-1508862874795.jpg\"  \/><\/a><\/p>\n<p>\u53ef\u4ee5\u770b\u51fa TCP \u5305\u542b\u4e86\u4e00\u4e2a message\uff0c\u7531 navi-pbrpc \u7684\u534f\u8bae\u6808\u89c4\u5b9a\u7684 header+payload \u6784\u6210\uff0c<\/p>\n<p>\u7ee7\u7eed\u6df1\u5165\u5206\u6790 message \u4e2d\u7684\u5185\u5bb9\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n<p>(\u70b9\u51fb\u653e\u5927\u56fe\u50cf)<\/p>\n<p><a href=\"https:\/\/res.infoq.com\/articles\/get-to-know-rpc\/zh\/resources\/421-1508862874796.jpg\" class=\"gallery_colorbox\"><img decoding=\"async\" src=\"https:\/\/res.infoq.com\/articles\/get-to-know-rpc\/zh\/resources\/421-1508862874796.jpg\" alt=\"\" data-src=\"articles\/get-to-know-rpc\/zh\/resources\/421-1508862874796.jpg\"  \/><\/a><\/p>\n<p>\u5176\u4e2d<\/p>\n<ul>\n<li>61 70 = ap \u662f\u5934\u4e2d\u7684\u7684 provider \u6807\u8bc6<\/li>\n<li>body length \u662f 2\uff0c\u6ce8\u610f navi-pbrpc \u91c7\u7528\u4e86\u5c0f\u5c3e\u7aef\u3002<\/li>\n<li>payload \u662f 08 7f\uff0c08 \u5728 PB \u4e2d\u7406\u89e3\u4e3a\u7b2c\u4e00\u4e2a\u5c5e\u6027\uff0c\u662f varint \u6574\u578b\uff0c7f \u8868\u793a\u4f20\u8f93\u7684\u662f 127 \u8fd9\u4e2a\u6574\u578b\u3002<\/li>\n<\/ul>\n<p>\u670d\u52a1\u7aef\u54cd\u5e94 RPC \u8bf7\u6c42\uff0c\u8fd8\u662f\u7531 navi-pbrpc \u7684\u534f\u8bae\u6808\u89c4\u5b9a\u7684 header+payload \u6784\u6210\uff0c\u53ef\u4ee5\u770b\u51fa body \u5c31\u662f PB \u4f8b\u5b50\u91cc\u9762\u7684\u4e8c\u8fdb\u5236\u6570\u636e\u3002<\/p>\n<p>(\u70b9\u51fb\u653e\u5927\u56fe\u50cf)<\/p>\n<p><a href=\"https:\/\/res.infoq.com\/articles\/get-to-know-rpc\/zh\/resources\/422-1508862874796.jpg\" class=\"gallery_colorbox\"><img decoding=\"async\" src=\"https:\/\/res.infoq.com\/articles\/get-to-know-rpc\/zh\/resources\/422-1508862874796.jpg\" alt=\"\" data-src=\"articles\/get-to-know-rpc\/zh\/resources\/422-1508862874796.jpg\"  \/><\/a><\/p>\n<p>\u6700\u540e\uff0c\u5ba2\u6237\u7aef\u9000\u51fa\uff0c\u56db\u6b21\u5206\u624b\u7ed3\u675f\u3002<\/p>\n<h2>\u603b\u7ed3<\/h2>\n<p>\u672c\u6587\u7cfb\u7edf\u6027\u5730\u4ecb\u7ecd\u4e86 RPC \u5305\u542b\u7684\u6838\u5fc3\u6982\u5ff5\u548c\u6280\u672f\uff0c\u5e26\u7740\u8bfb\u8005\u4ece\u4e00\u4e2a\u5b9e\u9645\u7684\u4f8b\u5b50\u53bb\u6620\u5c04\u7406\u89e3\u3002\u5f88\u591a\u4e1c\u897f\u90fd\u662f\u873b\u8713\u70b9\u6c34\uff0c\u6bcf\u4e00\u4e2a\u5173\u952e\u5b57\u90fd\u80fd\u6210\u4e3a\u4e00\u4e2a\u5f88\u5927\u7684\u8bdd\u9898\uff0c\u5e0c\u671b\u8fd9\u4e2a\u63d0\u7eb2\u6308\u9886\u7684\u4ecb\u7ecd\u53ef\u4ee5\u8ba9\u8bfb\u8005\u5728\u5927\u8111\u91cc\u9762\u6709\u4e00\u4e2a\u7cfb\u7edf\u7684\u4f53\u7cfb\u53bb\u770b\u5f85 RPC\u3002<\/p>\n<p>\u539f\u6587\u51fa\u81ea\uff1ahttp:\/\/www.infoq.com\/cn\/articles\/get-to-know-rpc<\/p>\n<p>\u8f6c\u8f7d\u8bf7\u6ce8\u660e\uff1a<a href=\"https:\/\/www.chenweikang.top\">\u5de6\u624b\u4ee3\u7801\u53f3\u624b\u8bd7<\/a> &raquo; <a href=\"https:\/\/www.chenweikang.top\/?p=516\">\u4f53\u7cfb\u5316\u8ba4\u8bc6RPC<\/a><\/p><div class=\"__youshang\">\r\n            <div id=\"__youshang_popup\" class=\"wechat popup\" style=\"display: none;\">\r\n                <div class=\"head\">~\u8c22\u8c22\u6253\u8d4f~<\/div>\r\n                <div class=\"qrcode\"><div class=\"qrcode-li wechat\" ><img src=\"https:\/\/www.chenweikang.top\/wp-content\/uploads\/2019\/07\/wexin.png\" \/><\/div><div class=\"qrcode-li alipay\" style=\"display:none;\"><img src=\"https:\/\/www.chenweikang.top\/wp-content\/uploads\/2019\/07\/ali-pay.png\" \/><\/div><div class=\"qrcode-li hongbao\" style=\"display:none;\"><img src=\"https:\/\/www.chenweikang.top\/wp-content\/uploads\/2019\/07\/ali-hongbao.png\" \/><\/div><\/div>\r\n                <ul class=\"platform\"><li class=\"icon-wechat active\" data-bg-color=\"#05af4e\" data-thanks=\"~\u8c22\u8c22\u6253\u8d4f~\"><\/li><li class=\"icon-alipay \" data-bg-color=\"#00a2ea\" data-thanks=\"~\u8c22\u8c22\u6253\u8d4f~\"><\/li><li class=\"icon-hongbao \" data-bg-color=\"#dd5746\" data-thanks=\"<p>\u626b\u7801\u9886\u7ea2\u5305<\/p><p style='margin-top: 24px;'>\uff08\u4f59\u989d\u5b9d\u652f\u4ed8\u65f6\u53ef\u62b5\u73b0\uff09<\/p>\"><\/li><\/ul>\r\n            <\/div>\r\n            <a href=\"javascript:void(0);\" id=\"__youshang_btn\">\u8d4f<\/a>\r\n        <\/div>","protected":false},"excerpt":{"rendered":"<p>RPC\uff08Remote Procedure Call\uff09\uff0c\u5373\u8fdc\u7a0b\u8fc7\u7a0b\u8c03\u7528\uff0c\u662f\u4e00\u4e2a\u5206\u5e03\u5f0f\u7cfb\u7edf\u95f4\u901a\u4fe1\u7684\u5fc5\u5907\u6280\u672f\uff0c\u672c\u6587\u4f53 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":518,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[3,5],"tags":[55],"class_list":["post-516","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-note","category-website","tag-rpc"],"_links":{"self":[{"href":"https:\/\/www.chenweikang.top\/index.php?rest_route=\/wp\/v2\/posts\/516","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.chenweikang.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.chenweikang.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.chenweikang.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.chenweikang.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=516"}],"version-history":[{"count":0,"href":"https:\/\/www.chenweikang.top\/index.php?rest_route=\/wp\/v2\/posts\/516\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.chenweikang.top\/index.php?rest_route=\/wp\/v2\/media\/518"}],"wp:attachment":[{"href":"https:\/\/www.chenweikang.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=516"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.chenweikang.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=516"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.chenweikang.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=516"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}