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Staged Event-Driven Architecture\uff0c\u7b80\u79f0SEDA\uff0c\u8fd9\u4e2a\u8bcd\u6700\u5f00\u59cb\u662f\u5728Cassandra\u90a3\u8fb9\u542c\u5230\u7684\u3002\u8fd9\u4e2a\u67b6\u6784\u7684\u63d0\u51fa\u662f2001\u5e74\u7684\u4e8b\u60c5\u4e86\uff0c\u7528\u591a\u4e2a\u7ebf\u7a0b\u6c60\u800c\u975e\u4e00\u4e2a\u6765\u5904\u7406\u8bf7\u6c42\u3002\u4e00\u4e2a\u8bf7\u6c42\u4ece\u5f00\u59cb\u5230\u7ed3\u675f\u88ab\u62c6\u5206\u4e3a\u591a\u4e2a\u9636\u6bb5\uff0c\u6bcf\u4e2a\u9636\u6bb5\u7528\u4e00\u4e2a\u72ec\u7acb\u7ebf\u7a0b\u6c60\u3001\u5e76\u4e14\u6bcf\u4e2a\u9636\u6bb5\u7684\u7ebf\u7a0b\u6570\u53ef\u4ee5\u4e0d\u7b49\uff0c\u5728\u9636\u6bb5\u4e4b\u95f4\u7528\u4e00\u4e2a\u961f\u5217\u8fde\u63a5\u3002\u6bcf\u4e2a\u9636\u6bb5\u5904\u7406\u5b8c\u5c31\u6254\u961f\u5217\u91cc\uff0c\u4e0b\u4e2a\u9636\u6bb5\u7684\u7ebf\u7a0b\u4ece\u961f\u5217\u62c9\u8bf7\u6c42\u53bb\u5904\u7406\u3002\u6bcf\u6b21\u5904\u7406\u5b8c\u4e00\u4e2a\u8bf7\u6c42\u5c31\u4ece\u961f\u5217\u91cc\u62ff\u4e0b\u4e2a\u8bf7\u6c42\u6765\u5904\u7406\u3002\u5230\u4e862016\u5e74\uff0c\u5b9e\u9645\u4e0a\u51e0\u4e4e\u4efb\u4f55server\u6216\u8005server\u7684\u6846\u67b6\u90fd\u4f1a\u7528\u7c7b\u4f3c\u7684\u67b6\u6784\uff0c\u6bd4\u5982\u4e00\u4e2aWeb\u670d\u52a1\u5668\u90fd\u6709\u5982\u4e0b\u4e00\u4e9b\u9636\u6bb5\uff1aaccept\u65b0\u7684\u8fde\u63a5\uff0c\u6839\u636ehttp\u534f\u8bae\u6765parse\u6210\u5bf9\u5e94web\u670d\u52a1\u6807\u51c6\u7684\u8bf7\u6c42\uff0c\u8c03\u7528\u4e1a\u52a1\u5b9e\u73b0\u8005\u7684\u4e1a\u52a1\u4ee3\u7801\u5904\u7406\u8bf7\u6c42\u3001\u628a\u8bf7\u6c42\u7684\u7ed3\u679c\u8fd4\u56de\u7ed9client\u3002\u4e0d\u4e00\u5b9a\u6bcf\u4e2a\u9636\u6bb5\u90fd\u662f\u72ec\u7acb\u7684\u4e00\u4e2a\u7ebf\u7a0b\u6c60\u3001\u7528\u961f\u5217\u8fde\u63a5\uff0c\u4f46\u81f3\u5c11\u5728\u201c\u4e1a\u52a1\u5b9e\u73b0\u8005\u7684\u4e1a\u52a1\u4ee3\u7801\u5904\u7406\u8bf7\u6c42\u201d\u8fd9\u6b65\uff0c\u662f\u6709\u4e00\u4e2a\u7ebf\u7a0b\u6c60\u6765\u505a\u7684\u3002\u8fd9\u6837\u8fd9\u4e9b\u7ebf\u7a0b\u4e0d\u65ad\u7684\u8dd1\u4e1a\u52a1\u5b9e\u73b0\u8005\u7684\u5199\u7684\u4ee3\u7801\uff0c\u524d\u9762\u548c\u540e\u9762\u7684\u4efb\u52a1\u90fd\u662f\u6846\u67b6\u6765\u505a\uff0c\u53ef\u80fd\u5e76\u4e0d\u5728\u4e00\u4e2a\u7ebf\u7a0b\u6c60\u8dd1\u3002\u800c\u8fd9\u4e2a\u9636\u6bb5\u7684\u7ebf\u7a0b\u4e00\u822c\u4e5f\u53ebworker\u6216\u8005handler\u3002\u8fd9\u5f53\u7136\u4e5f\u6ca1\u5565\u9ad8\u7aef\u7684\uff0c\u4e0d\u5c31\u662f\u7ebf\u7a0b\u6c60\u561b\u3002\u4f46\u662f\u57282001\u5e74\u7684\u8bba\u6587\u4e2d\uff0c\u5355\u7eaf\u7684\u201c\u7ebf\u7a0b\u6c60\u6a21\u578b\u201d\u662f\u9650\u5236\u6b7b\u4e86\u5e76\u53d1\u8bf7\u6c42\u6570\u7684\uff0c\u4e00\u65e6\u5f53\u524d\u6ca1\u6709\u4efb\u4f55\u7ebf\u7a0b\u53ef\u7528\uff0c\u5c31\u76f4\u63a5\u628a\u8bf7\u6c42\u4e22\u6389\u7684\uff08\u4f30\u8ba120\u5e74\u524d\u7684web server\u90fd\u662f\u8fd9\u4e48\u5199\u7684\uff1f\uff09\u3002\u6240\u4ee5\u6211\u89c9\u5f97\u53ea\u8981\u6709\u4e2a\u961f\u5217\u6765\u7b49\u5f85handler\u5904\u7406\u8bf7\u6c42\uff0c\u5c31\u53ef\u7b97\u4f5cSEDA\u4e86\u3002<\/p>\n
SEDA\u7684\u8bba\u6587\u5728\u5f53\u65f6\uff08\u591a\u6838CPU\u90fd\u5f88\u5c11\u3001\u64cd\u4f5c\u7cfb\u7edf\u7684\u7ebf\u7a0b\u5b9e\u73b0\u5f88\u5f31\uff09\u5176\u5b9e\u5176\u4e2d\u4e00\u4e2a\u60f3\u89e3\u51b3\u7684\u95ee\u9898\u662f\u627e\u5230\u7cfb\u7edf\u7684\u74f6\u9888\u7684\u95ee\u9898\uff0c\u5728\u4e0d\u80fd\u5f00\u5f88\u591a\u7ebf\u7a0b\u7684\u60c5\u51b5\u4e0b\uff0c\u627e\u5230\u6d88\u8017\u8d44\u6e90\u7684\u7ebf\u7a0b\uff0c\u5728\u8fd9\u4e9b\u9636\u6bb5\u591a\u5f00\u3001\u5728\u4e0d\u6d88\u8017\u8d44\u6e90\u7684\u9636\u6bb5\u5c11\u5f00\u3002\u540c\u65f6\u8fd8\u63d0\u5230\u4e86\u6839\u636e\u6bcf\u4e2a\u9636\u6bb5\u7684\u54cd\u5e94\u65f6\u95f4\u52a8\u6001\u8c03\u6574\u7ebf\u7a0b\u6c60\u5927\u5c0f\u4e4b\u7c7b\u7684\u529f\u80fd\u3002\u8fd9\u4e9b\u5728\u73b0\u5728\u5176\u5b9e\u90fd\u6ca1\u5565\u5927\u7528\u4e86\u3002\u591a\u6838\u904d\u5730\u3001thread\u53ef\u4ee5\u5f00\u5f88\u591a\uff0c\u4e0d\u80fd\u8bf4\u50cfcoroutine\u3001goroutine\u4e00\u6837\u968f\u4fbf\u5f00\uff0c\u4e5f\u8d77\u7801\u4e0d\u81f3\u4e8e\u8fd8\u5f97\u52a8\u6001\u8c03\u6574\u4e86\u3002\u4e5f\u6b63\u662f\u5982\u6b64\uff0c\u73b0\u5728\u7684web\u670d\u52a1\u5728\u4e1a\u52a1\u903b\u8f91\u90a3\u5757\u4e5f\u666e\u904d\u4e0d\u4f1a\u518d\u62c6\u6210\u4e0d\u540c\u7684stage\u4e86\uff0c\u4ece\u5934\u8dd1\u5230\u5c3e\u5c31\u53ef\u4ee5\uff08\u6309\u539f\u4f5c\u8005\u57282010\u5e74\u7684\u535a\u6587\u4e2d\u603b\u7ed3\u7684\uff0c\u5c31\u662f\u5f88\u591a\u62c6\u7684\u5f88\u7ec6\u7684stage\u5e94\u8be5\u7528\u51fd\u6570\u8c03\u7528\u6765\u8fde\u63a5\uff0c\u90a3\u5176\u5b9e\u4e0d\u5c31\u662f\u4e0d\u62c6\u4e86\uff09\u3002<\/p>\n
\u90a3\u73b0\u5728\u7684\u6a21\u5f0f\u6709\u5565\u95ee\u9898\u5462\uff1f<\/p>\n
\u5047\u8bbe\u6211\u4eec\u6709100\u4e2ahandler\u6765\u5904\u7406\u8bf7\u6c42\u3002\u91cc\u9762\u7684\u903b\u8f91\u90fd\u662f\u5185\u5b58+CPU\uff0c\u81ea\u7136\u6ca1\u5565\u95ee\u9898\uff1b\u5982\u679c\u662f\u8bfb\u786c\u76d8\uff0c\u53ef\u80fd\u95ee\u9898\u4e5f\u4e0d\u5927\uff1b\u5982\u679c\u662f\u540e\u9762\u6709\u4e00\u5806\u65e0\u72b6\u6001\u7684rpc server\u9700\u8981\u8c03\u7528\uff08\u6bd4\u5982nginx+http server\u7684\u6a21\u5f0f\uff09\uff0c\u90a3\u4e48\u53ea\u8981\u80fd\u53d1\u73b0\u6709\u95ee\u9898\u7684\u540e\u53f0server\u7136\u540e\u8e22\u6389\u5c31\u884c\u3002\u4f46\u5982\u679c\u5e95\u4e0b\u662f\u8bfb\u4e00\u4e2a\u6570\u636e\u5e93\uff0c\u5c24\u5176\u662f\u6709\u591a\u4e2a\u8282\u70b9\u7684\u3001\u6709\u72b6\u6001\u7684\u5206\u5e03\u5f0f\u6570\u636e\u5e93\uff08\u4e0d\u540c\u7684\u6570\u636e\u5206\u5e03\u5728\u4e0d\u540c\u7684\u673a\u5668\u4e0a\uff0c\u673a\u5668\u6302\u4e86\u4e0d\u80fd\u76f4\u63a5\u8e22\u6389\uff09\uff0c\u5c31\u53ef\u80fd\u6709\u5982\u4e0b\u95ee\u9898\uff1a<\/p>\n
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\u8fd9\u4e2a\u95ee\u9898\u7684\u672c\u8d28\u5728\u4e8e\uff0chandler\u662fblocking\u6a21\u5f0f\u3002\u8dd1\u5b8c\u5b8c\u6574\u7684\u8bf7\u6c42\u624d\u4f1a\u628a\u7ebf\u7a0b\u8ba9\u51fa\u6765\u3002\u90a3\u4e48\u5982\u679c\u5176\u4e2d\u67d0\u4e2a\u5730\u65b9\u963b\u585e\u4e86\uff08\u9501\u3001IO\u7b49\u7b49\uff09\uff0c\u90a3\u4e48\u5c31\u4e00\u76f4\u8981\u5360\u7528\u3002Blocking\u6a21\u5f0f\u7684\u4ee3\u7801\u5f53\u7136\u662f\u6700\u597d\u5199\u7684\uff0c\u4ece\u5934\u5230\u5c3e\u6309\u7167\u903b\u8f91\u6765\uff0c\u9047\u5230\u5e76\u53d1\u8bbf\u95ee\u540c\u4e00\u4e2a\u5b57\u6bb5\u4e4b\u7c7b\u7684\u5c31\u52a0\u9501\u7b49\u7740\uff0c\u7b80\u5355\u76f4\u63a5\u3002\u800cCassandra\u76ee\u524d\u5c31\u6709\u4e2a\u975e\u5e38\u6fc0\u8fdb\u7684\u8ba1\u5212\uff0c\u628a\u6574\u4e2aserver\u62c6\u6210non-blocking\u7684\u6a21\u5f0f\uff0c\u5e76\u4e14\u6709\u53ef\u80fd\u6709\u5e76\u53d1\u8bbf\u95ee\u540c\u4e00\u4e2a\u6570\u636e\u7684\u8bf7\u6c42\u90fd\u5206\u914d\u7ed9\u540c\u4e00\u4e2athread\/EventLoop\u6765\u6267\u884c\u4ece\u800c\u5b8c\u5168\u89c4\u907f\u9501\uff08\u4ed6\u4eec\u662f\u8bf4\u80fd\u4e0d\u9700\u8981\u9501\uff0c\u4f46\u8fd8\u6ca1\u5f00\u59cb\u5199\uff0c\u6240\u4ee5\u6839\u636e\u6587\u6863\u6309\u6211\u76ee\u524d\u7684\u7406\u89e3\u662f\u8fd9\u6837\u5b9e\u73b0\u7684\uff09\uff0c\u6bcf\u6b21\u6267\u884c\u4e00\u6bb5\u4e0d\u4f1a\u963b\u585e\u7684\u4ee3\u7801\uff0c\u9047\u5230\u963b\u585e\u64cd\u4f5c\u5c31\u628a\u5f53\u524d\u7ebf\u7a0b\u8ba9\u51fa\u53bb\uff0c\u7b49\u5bf9\u5e94\u7684\u72b6\u6001ready\u4e86\u518d\u6267\u884c\u4e0b\u4e00\u6b65\u7684event\u4e8b\u4ef6\u3002\u6574\u4e2a\u7cfb\u7edf\u5b8c\u5168\u4e0d\u4f1a\u6709\u4efb\u4f55\u7ebf\u7a0b\u88ab\u963b\u585e\uff0c\u81ea\u7136\u53ef\u4ee5\u6839\u672c\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u3002\u6bcf\u4e2a\u65f6\u523b\u6bcf\u4e2athread\u90fd\u5728\u5e72\u6d3b\uff0c\u90a3\u4e48\u6574\u4e2a\u7cfb\u7edf\u7684\u7ebf\u7a0b\u6570\u53ef\u4ee5\u5b8c\u5168\u7b49\u4e8eCPU\u6570\uff0c\u4e5f\u5c31\u662f\u6240\u8c13\u7684Thread Per Core\u67b6\u6784\uff08TPC\uff09\u3002\u800c\u4e14\u8fde\u9501\u90fd\u4e0d\u9700\u8981\u4e86\uff0c\u5f88\u591a\u4ee3\u7801\u90fd\u4e0d\u9700\u8981\u8003\u8651\u539f\u5b50\u6027\u4e86\uff0c\u5404\u79cd\u5bb9\u5668\u76f4\u63a5\u4e0a\u975e\u5e76\u53d1\u7684\uff0c\u6027\u80fd\u66f4\u597d\uff0c\u5bf9GC\u538b\u529b\u4e5f\u5c0f\uff0c\u64cd\u4f5c\u7cfb\u7edf\u4e5f\u6ca1\u7ebf\u7a0b\u5207\u6362\u7684\u5f00\u9500\u3002Cassandra\u7684\u76ee\u6807\u662f\u4eceSEDA\u8f6c\u5411TPC\uff0c\u53ea\u4e0d\u8fc7\u4ee3\u7801\u6539\u52a8\u4f1a\u5f88\u5927\uff0c\u56e0\u4e3a\u8981\u628a\u6240\u6709blocking\u7684\u90fd\u62c6\u6389\uff0c\u8fd1\u4e4e\u91cd\u5199\u6bcf\u4e2a\u6a21\u5757\u4e86\uff0c\u662f\u4e2a\u975e\u5e38\u957f\u671f\u7684\u4e8b\u60c5\u3002\u8fd9\u5757\u6211\u6700\u8fd1\u4e5f\u5728\u7814\u7a76\uff0c\u611f\u89c9\u633a\u597d\u73a9\u7684\u3002<\/p>\n
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