{"id":5116,"date":"2020-10-22T17:17:15","date_gmt":"2020-10-22T09:17:15","guid":{"rendered":"https:\/\/www.xttblog.com\/?p=5116"},"modified":"2020-10-22T17:17:15","modified_gmt":"2020-10-22T09:17:15","slug":"1024%e7%a8%8b%e5%ba%8f%e5%91%98%e8%8a%82%ef%bc%8c%e5%8f%b7%e7%a7%b0%e5%8f%b2%e4%b8%8a%e6%9c%80%e9%9a%be-java-%e9%9d%a2%e8%af%95%e9%a2%98%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.xttblog.com\/?p=5116","title":{"rendered":"1024\u7a0b\u5e8f\u5458\u8282\uff0c\u53f7\u79f0\u53f2\u4e0a\u6700\u96be Java \u9762\u8bd5\u9898\uff1f"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u4eca\u5929\u62c9\u52fe\u641e\u4e86\u4e00\u4e2a\u6d3b\u52a8\uff0c\u91cc\u9762\u6709\u4e00\u5957 Java \u9ad8\u7ea7\u5de5\u7a0b\u5e08\u7684\u9762\u8bd5\u9898\uff0c\u6211\u53d1\u5230\u4e86\u4e00\u4e2a\u7fa4\u91cc\uff0c\u5f88\u591a\u4eba\u90fd\u56de\u7b54\u4e0d\u51fa\u6765\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6700\u540e\u770b\u4e86\u4e00\u4e0b\u6392\u884c\u699c\uff0c\u53d1\u73b0\u56de\u7b54\u5bf9 1\u30012 \u9053\u9898\u7684\u4eba\u5360\u4e86 80% \u7684\u4eba\u3002\u901a\u8fc7\u8fd9\u4e9b\u9898\u53ef\u4ee5\u7b80\u5355\u7684\u8003\u5bdf\u51fa\u4f60\u7684\u6280\u672f\u5230\u5e95\u662f\u51fa\u4e8e\u54ea\u4e00\u4e2a\u5c42\u6b21\u7684\u6c34\u5e73\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0b\u9762\u6211\u628a\u8fd9\u4e9b\u9898\u90fd\u5217\u4e3e\u4e86\u51fa\u6765\uff0c\u5927\u5bb6\u53ef\u4ee5\u5148\u4e0d\u770b\u7b54\u6848\uff0c\u5148\u505a\u4e00\u904d\u8bd5\u4e00\u8bd5\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Apache Dubbo\u7684\u9ed8\u8ba4\u96c6\u7fa4\u5bb9\u9519\u65b9\u6848\u662f\uff1f<\/h2>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>A. Failover Cluster<br>B. Failfast Cluster<br>C. Failsafe Cluster<br>D. Failback Cluster<\/p><\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e0b\u9762\u5173\u4e8eKafka\u8bf4\u6cd5\u9519\u8bef\u7684\u662f\uff1f<\/h2>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>A. \u6d88\u606f\u662f\u6309\u7167topic\u8fdb\u884c\u5212\u5206\u7684\uff0c\u4e00\u4e2atopic\u5c31\u662f\u4e00\u4e2aqueue\uff0c\u4e00\u4e2atopic\u53ef\u4ee5\u6709\u591a\u4e2a\u6d88\u8d39\u65b9\uff0c\u5f53\u751f\u4ea7\u65b9\u5728\u67d0\u4e2atopic\u53d1\u51fa\u4e00\u6761\u6d88\u606f\u540e\uff0c\u6240\u6709\u8ba2\u9605\u4e86\u8fd9\u4e2atopic\u7684\u6d88\u8d39\u65b9\u90fd\u53ef\u4ee5\u6536\u5230\u8fd9\u6761\u6d88\u606f<br>B. kafka\u4e3a\u6bcf\u4e2atopic\u7ef4\u62a4\u4e86\u591a\u4e2apartition\u5206\u533a\uff0c\u80fd\u4fdd\u8bc1\u4e00\u4e2atopic\u7684\u6d88\u606f\u6d88\u8d39\u6709\u5e8f<br>C. \u6240\u6709\u7684\u6d88\u606f\u8bfb\u5199\u90fd\u662f\u5728\u4e3bpatition\u4e2d\u8fdb\u884c\uff0c\u5176\u4ed6\u526f\u672c\u5206\u533a\u53ea\u4f1a\u4ece\u4e3b\u5206\u533a\u590d\u5236\u6570\u636e<br>D. \u6d88\u606f\u7684\u53d1\u9001\u6709\u4e09\u79cd\u65b9\u5f0f\uff1a\u540c\u6b65\u3001\u5f02\u6b65\u4ee5\u53caoneway\uff0c\u5f02\u6b65\u4e3a\u9ed8\u8ba4\u65b9\u5f0f<\/p><\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e0b\u9762\u5173\u4e8e\u6392\u5e8f\u7b97\u6cd5\u7684\u63cf\u8ff0\u6b63\u786e\u7684\u662f\uff1f<\/h2>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>A. \u5192\u6ce1\u6392\u5e8f\u548c\u63d2\u5165\u6392\u5e8f\u90fd\u662f\u7a33\u5b9a\u7684\u6392\u5e8f\u7b97\u6cd5<br>B. \u5982\u679c\u6570\u7ec4\u5df2\u7ecf\u6309\u7167\u987a\u5e8f\u6392\u597d\u5e8f\uff0c\u4f7f\u7528\u63d2\u5165\u6392\u5e8f\uff0c\u65f6\u95f4\u590d\u6742\u5ea6\u662f O(n)<br>C. \u5feb\u901f\u6392\u5e8f\u6bcf\u6b21\u9009\u62e9\u6700\u5927\u503c\u4f5c\u4e3a\u57fa\u51c6\u503c\u80fd\u591f\u52a0\u901f\u6392\u5e8f\u8fc7\u7a0b<br>D. \u5feb\u901f\u6392\u5e8f\u6700\u597d\u60c5\u51b5\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u662fO(nlogn)<\/p><\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">\u4ee5\u4e0b\u6709\u5173JVM\u7684\u8bf4\u6cd5\u6b63\u786e\u7684\u662f?<\/h2>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>A. \u7a0b\u5e8f\u8ba1\u6570\u5668\u662f\u4e00\u4e2a\u6bd4\u8f83\u5c0f\u7684\u5185\u5b58\u533a\u57df\uff0c\u7528\u4e8e\u6307\u793a\u5f53\u524d\u7ebf\u7a0b\u6240\u6267\u884c\u7684\u5b57\u8282\u7801 \u6267\u884c\u5230\u4e86\u7b2c\u51e0\u884c\uff0c\u662f\u7ebf\u7a0b\u9694\u79bb\u7684<br>B. \u865a\u62df\u673a\u6808\u63cf\u8ff0\u7684\u662fJava\u65b9\u6cd5\u6267\u884c\u7684\u5185\u5b58\u6a21\u578b\uff0c\u7528\u4e8e\u5b58\u50a8\u5c40\u90e8\u53d8\u91cf\uff0c\u64cd\u4f5c\u6570 \u6808\uff0c\u52a8\u6001\u94fe\u63a5\uff0c\u65b9\u6cd5\u51fa\u53e3\u7b49\u4fe1\u606f\uff0c\u662f\u7ebf\u7a0b\u9694\u79bb\u7684<br>C. \u65b9\u6cd5\u533a\u7528\u4e8e\u5b58\u50a8JVM\u52a0\u8f7d\u7684\u7c7b\u4fe1\u606f\u3001\u5e38\u91cf\u3001\u9759\u6001\u53d8\u91cf\u3001\u4ee5\u53ca\u7f16\u8bd1\u5668\u7f16\u8bd1\u540e \u7684\u4ee3\u7801\u7b49\u6570\u636e\uff0c\u662f\u7ebf\u7a0b\u5171\u4eab\u7684<br>D. \u5806\u88ab\u6240\u6709\u7ebf\u7a0b\u5171\u4eab\uff0c\u76ee\u7684\u662f\u4e3a\u4e86\u5b58\u653e\u5bf9\u8c61\u5b9e\u4f8b\uff0c\u51e0\u4e4e\u6240\u6709\u7684\u5bf9\u8c61\u5b9e\u4f8b\u90fd\u5728\u8fd9\u91cc\u5206\u914d\u3002\u5f53\u5806\u5185\u5b58\u6ca1\u6709\u53ef\u7528\u7684\u7a7a\u95f4\u65f6\uff0c\u4f1a\u629b\u51faOOM\u5f02\u5e38<\/p><\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">\u5173\u4e8eTCP\u7684\u5173\u95ed\u8fc7\u7a0b\uff0c\u8bf4\u6cd5\u6b63\u786e\u7684\u662f\uff1f<\/h2>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>A. \u5904\u4e8eTIME_WAIT\u72b6\u6001\u7684\u8fde\u63a5\u7b49\u5f852MSL\u540e\u771f\u6b63\u5173\u95ed\u8fde\u63a5<br>B. \u5bf9\u4e00\u4e2aestablished\u72b6\u6001\u7684TCP\u8fde\u63a5\uff0c\u5728\u8c03\u7528shutdown\u51fd\u6570\u4e4b\u524d\u8c03\u7528close\u63a5\u53e3\uff0c\u53ef\u4ee5\u8ba9\u4e3b\u52a8\u8c03\u7528\u7684\u4e00\u65b9\u8fdb\u5165\u534a\u5173\u95ed\u72b6\u6001<br>C. \u4e3b\u52a8\u53d1\u9001FIN\u6d88\u606f\u7684\u8fde\u63a5\u7aef\uff0c\u6536\u5230\u5bf9\u65b9\u56de\u5e94ack\u4e4b\u524d\u4e0d\u80fd\u53d1\u53ea\u80fd\u6536\uff0c\u5728\u6536\u5230\u5bf9\u65b9\u56de\u590dack\u4e4b\u540e\u4e0d\u80fd\u53d1\u4e5f\u4e0d\u80fd\u6536\uff0c\u8fdb\u5165CLOSING\u72b6\u6001<br>D. \u867d\u7136TCP\u662f\u53ef\u9760\u4f20\u8f93\uff0c\u4f46\u5728\u5df2\u7ecf\u6210\u529f\u5efa\u7acb\u8fde\u63a5\u7684TCP\u8fde\u63a5\u4e0a\uff0c\u4e5f\u53ef\u80fd\u5b58\u5728\u62a5\u6587\u4e22\u5931<\/p><\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">\u5173\u4e8eB+\u6811\u6bd4B\u6811\u66f4\u9002\u5408\u505a\u7d22\u5f15\uff0c\u4ee5\u4e0b\u8bf4\u6cd5\u6b63\u786e\u7684\u662f\uff1f<\/h2>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>A. \u53f6\u8282\u70b9\u4e4b\u95f4\u6709\u6307\u9488\u76f8\u8fde\uff0cb+\u6811\u66f4\u9002\u5408\u8303\u56f4\u68c0\u7d22;<br>B. \u975e\u53f6\u8282\u70b9\u53ea\u4fdd\u5b58\u5173\u952e\u5b57\u548c\u6307\u9488\uff0c\u540c\u6837\u5927\u5c0f\u975e\u53f6\u8282\u70b9\uff0cb+\u6811\u53ef\u4ee5\u5bb9\u7eb3\u66f4\u591a\u7684\u5173\u952e\u5b57\uff0c\u53ef\u4ee5\u964d\u4f4e\u6811\u9ad8\uff0c\u67e5\u8be2\u65f6\u78c1\u76d8\u8bfb\u5199\u4ee3\u4ef7\u66f4\u4f4e;<br>C. B+\u6811\u7684\u67e5\u8be2\u6548\u7387\u6bd4\u8f83\u7a33\u5b9a\u3002\u4efb\u4f55\u5173\u952e\u5b57\u7684\u67e5\u627e\u5fc5\u987b\u8d70\u4e00\u6761\u4ece\u6839\u7ed3\u70b9\u5230\u53f6\u5b50\u7ed3\u70b9\u7684\u8def\u3002\u6240\u6709\u5173\u952e\u5b57\u67e5\u8be2\u7684\u8def\u5f84\u957f\u5ea6\u76f8\u540c\uff0c\u6548\u7387\u76f8\u5f53\u3002<br>D. \u975e\u53f6\u8282\u70b9\u4e0a\uff0c\u589e\u52a0\u4e86\u6307\u5411\u540c\u4e00\u5c42\u4e0b\u4e00\u4e2a\u975e\u53f6\u8282\u70b9\u7684\u6307\u9488\uff0c\u5c06\u8282\u70b9\u7684\u6700\u4f4e\u5229\u7528\u7387\u4ece1\/2\u63d0\u9ad8\u52302\/3<\/p><\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">\u4ee5\u4e0b\u5173\u4e8eNetty\u8bf4\u6cd5\uff0c\u6b63\u786e\u7684\u662f\uff1f<\/h2>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>A. netty\u7ebf\u7a0b\u6a21\u578b\u91c7\u7528\u201c\u670d\u52a1\u7aef\u76d1\u542c\u7ebf\u7a0b\u201d\u548c\u201cIO\u7ebf\u7a0b\u201d\u5206\u79bb\u7684\u65b9\u5f0f<br>B. \u901a\u5e38\u60c5\u51b5\u4e0b\u5728NIO\u975e\u963b\u585e\u6a21\u5f0f\u4e0b\uff0cNetty\u4e3a\u6bcf\u4e2aChannel\u5206\u914d\u4e00\u4e2aEventLoop\uff0c\u5e76\u4e14\u5b83\u7684\u6574\u4e2a\u751f\u547d\u5468\u671f\u4e2d\u7684\u4e8b\u4ef6\u90fd\u7531\u8fd9\u4e2aEventLoop\u6765\u5904\u7406<br>C. \u4e00\u4e2aeventLoop\u53ef\u4ee5\u7ed1\u5b9a\u591a\u4e2aChannel<br>D. \u4e00\u822c\u63a5\u6536\u6d88\u606f\u65f6\uff0c\u7531pipeline\u5904\u7406\u5b8c\u6210\u4f1a\u628a\u6d88\u606f\u63d0\u4ea4\u5230\u4e1a\u52a1\u7ebf\u7a0b\u6c60\u8fdb\u884c\u5904\u7406<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">MyBatis\u5728\u6267\u884cSQL\u65f6\uff0c\u6b63\u786e\u7684\u8c03\u7528\u987a\u5e8f\u662f\uff1f<br>\n\u2460 SqlSessionFactory<br>\n\u2461 SqlSession<br>\n\u2462 StatementHandler<br>\n\u2463 ParameterHandler<br>\n\u2464 ResultSetHandler<br>\n\u2465 Executor<br>\n\u2466TypeHandler<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>A. \u2460\u2461\u2462\u2463\u2464\u2465\u2466<br>B. \u2460\u2461\u2465\u2462\u2463\u2466\u2464<br>C. \u2460\u2461\u2463\u2462\u2466\u2465\u2464<br>D. \u2460\u2461\u2462\u2466\u2463\u2465\u2464<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ee5\u4e0b\u5173\u4e8e\u5411\u7ebf\u7a0b\u6c60\u63d0\u4ea4\u4efb\u52a1\uff0c\u6b63\u786e\u7684\u6b65\u9aa4\u662f\uff1f<br>\n\u2460 \u5224\u65ad\u662f\u5426\u8fbe\u5230\u4e86\u7ebf\u7a0b\u6c60\u8bbe\u7f6e\u7684\u6700\u5927\u7ebf\u7a0b\u6570\uff0c\u5982\u679c\u6ca1\u6709\u8fbe\u5230\uff0c\u5c31\u521b\u5efa\u65b0\u7ebf\u7a0b\u6765\u6267\u884c\u4efb\u52a1<br>\n\u2461 \u5224\u65ad\u7ebf\u7a0b\u6c60\u4e2d\u7684\u7ebf\u7a0b\u6570\u662f\u5426\u5927\u4e8e\u8bbe\u7f6e\u7684\u6838\u5fc3\u7ebf\u7a0b\u6570\uff0c\u521b\u5efa\u6838\u5fc3\u7ebf\u7a0b\u6267\u884c\u4efb\u52a1<br>\n\u2462 \u5224\u65ad\u7f13\u51b2\u961f\u5217\u662f\u5426\u6ee1\u4e86\uff0c\u5982\u679c\u6ca1\u6ee1\uff0c\u653e\u5165\u961f\u5217\u7b49\u5f85\u6267\u884c<br>\n\u2463 \u6267\u884c\u62d2\u7edd\u7b56\u7565<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>A. \u2461\u2460\u2462\u2463<br>B. \u2461\u2462\u2460\u2463<br>C. \u2460\u2461\u2462\u2463<br>D. \u2460\u2462\u2461\u2463<\/p><\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">\u4ee5\u4e0b\u5173\u4e8e\u7c7b\u7684\u52a0\u8f7d\u673a\u5236\u9519\u8bef\u7684\u662f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A. \u7c7b\u7684\u52a0\u8f7d\u6307\u7684\u662f\u5c06\u7f16\u8bd1\u597d\u7684class\u7c7b\u6587\u4ef6\u4e2d\u7684\u5b57\u8282\u7801\u8bfb\u5165\u5230\u5185\u5b58\u4e2d\uff0c\u5c06\u5176\u653e\u5728\u5806\u5185\u5e76\u521b\u5efa\u5bf9\u5e94\u7684Class\u5bf9\u8c61<br>B. \u52a0\u8f7d\u662f\u6587\u4ef6\u5230\u5185\u5b58\u7684\u8fc7\u7a0b\u3002\u901a\u8fc7\u7c7b\u7684\u5b8c\u5168\u9650\u5b9a\u540d\u67e5\u627e\u6b64\u7c7b\u5b57\u8282\u7801\u6587\u4ef6\uff0c\u5e76\u5229\u7528\u5b57\u8282\u7801\u6587\u4ef6\u521b\u5efa\u4e00\u4e2aClass\u5bf9\u8c61<br>C. \u51c6\u5907\u9636\u6bb5\u662f\u8fdb\u884c\u5185\u5b58\u5206\u914d\u3002\u4e3a\u7c7b\u53d8\u91cf\u4e5f\u5c31\u662f\u7c7b\u4e2d\u7531static\u4fee\u9970\u7684\u53d8\u91cf\u5206\u914d\u5185\u5b58\uff0c\u5e76\u4e14\u8bbe\u7f6e\u521d\u59cb\u503c,\u521d\u59cb\u503c\u662f0\u6216\u8005null\uff0c\u800c\u4e0d\u662f\u4ee3\u7801\u4e2d\u8bbe\u7f6e\u7684\u5177\u4f53\u503c<br>D.\u89e3\u6790\u4e3b\u8981\u662f\u89e3\u6790\u5b57\u6bb5\u3001\u63a5\u53e3\u3001\u65b9\u6cd5\u3002\u4e3b\u8981\u662f\u5c06\u5e38\u91cf\u6c60\u4e2d\u7684\u7b26\u53f7\u5f15\u7528\u66ff\u6362\u4e3a\u76f4\u63a5\u5f15\u7528\u7684\u8fc7\u7a0b\u3002\u76f4\u63a5\u5f15\u7528\u5c31\u662f\u76f4\u63a5\u6307\u5411\u76ee\u6807\u7684\u6307\u9488\u3001\u76f8\u5bf9\u504f\u79fb\u91cf\u7b49<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0b\u9762\u6211\u5217\u4e3e\u51fa\u7b54\u6848\uff0c\u5927\u5bb6\u5bf9\u7167\u4e00\u4e0b\u770b\u770b\u4f60\u5bf9\u4e86\u591a\u5c11\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u95ee\u9898\u4e00\uff0c\u6b63\u786e\u7b54\u6848\uff1aA<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7b54\u6848\u89e3\u6790\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dubbo\u63d0\u4f9b\u4e86\u968f\u673a\u3001\u8f6e\u8be2\u3001\u6700\u5c11\u8c03\u7528\u4f18\u5148\u7b49\u591a\u79cd\u8d1f\u8f7d\u5747\u8861\u7b56\u7565\uff0c\u63d0\u4f9b\u5bf9zk\u7b49\u591a\u79cd\u6ce8\u518c\u4e2d\u5fc3\u7b49\u652f\u6301\uff0c\u80fd\u591f\u81ea\u52a8\u5b8c\u6210\u670d\u52a1\u7684\u6ce8\u518c\u4e0e\u53d1\u73b0\u3002dubbo\u63d0\u4f9b\u53ef\u89c6\u5316\u7684\u7ba1\u7406\u540e\u53f0\uff0c\u65b9\u4fbf\u5bf9\u670d\u52a1\u72b6\u6001\u8fdb\u884c\u76d1\u63a7\u548c\u7ba1\u7406\u3002dubbo\u7684\u6570\u636e\u901a\u4fe1\u9ed8\u8ba4\u4f7f\u7528netty\u6765\u5b9e\u73b0\uff0c\u62e5\u6709\u975e\u5e38\u4e0d\u9519\u7684\u6027\u80fd\u3002Dubbo\u9ed8\u8ba4\u7684\u5bb9\u9519\u65b9\u6848\u662fFailover Cluster\uff0c\u5373\uff1a\u5931\u8d25\u81ea\u52a8\u5207\u6362\uff0c\u5f53\u51fa\u73b0\u5931\u8d25\uff0c\u91cd\u8bd5\u5176\u5b83\u670d\u52a1\u5668\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u9664\u6b64\u4e4b\u5916\uff0c\u8fd8\u63d0\u4f9b\u4ee5\u4e0b\u5176\u4ed6\u5bb9\u9519\u65b9\u5f0f\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Failfast Cluster\uff1a\u5feb\u901f\u5931\u8d25\uff0c\u53ea\u53d1\u8d77\u4e00\u6b21\u8c03\u7528\uff0c\u5931\u8d25\u7acb\u5373\u62a5\u9519\u3002\u901a\u5e38\u7528\u4e8e\u975e\u5e42\u7b49\u6027\u7684\u5199\u64cd\u4f5c\uff0c\u6bd4\u5982\u65b0\u589e\u8bb0\u5f55\u3002<\/li><li>Failsafe Cluster\uff1a\u5931\u8d25\u5b89\u5168\uff0c\u51fa\u73b0\u5f02\u5e38\u65f6\uff0c\u76f4\u63a5\u5ffd\u7565\u3002\u901a\u5e38\u7528\u4e8e\u5199\u5165\u5ba1\u8ba1\u65e5\u5fd7\u7b49\u64cd\u4f5c\u3002<\/li><li>Failback Cluster\uff1a\u5931\u8d25\u81ea\u52a8\u6062\u590d\uff0c\u540e\u53f0\u8bb0\u5f55\u5931\u8d25\u8bf7\u6c42\uff0c\u5b9a\u65f6\u91cd\u53d1\u3002\u901a\u5e38\u7528\u4e8e\u6d88\u606f\u901a\u77e5\u64cd\u4f5c\u3002<\/li><li>Forking Cluster\uff1a\u5e76\u884c\u8c03\u7528\u591a\u4e2a\u670d\u52a1\u5668\uff0c\u53ea\u8981\u4e00\u4e2a\u6210\u529f\u5373\u8fd4\u56de\u3002\u901a\u5e38\u7528\u4e8e\u5b9e\u65f6\u6027\u8981\u6c42\u8f83\u9ad8\u7684\u8bfb\u64cd\u4f5c\uff0c\u4f46\u9700\u8981\u6d6a\u8d39\u66f4\u591a\u670d\u52a1\u8d44\u6e90\u3002\u53ef\u901a\u8fc7 forks=\u201d2\u2033 \u6765\u8bbe\u7f6e\u6700\u5927\u5e76\u884c\u6570\u3002<\/li><li>Broadcast Cluster\uff1a\u5e7f\u64ad\u8c03\u7528\u6240\u6709\u63d0\u4f9b\u8005\uff0c\u9010\u4e2a\u8c03\u7528\uff0c\u4efb\u610f\u4e00\u53f0\u62a5\u9519\u5219\u62a5\u9519 \u3002\u901a\u5e38\u7528\u4e8e\u901a\u77e5\u6240\u6709\u63d0\u4f9b\u8005\u66f4\u65b0\u7f13\u5b58\u6216\u65e5\u5fd7\u7b49\u672c\u5730\u8d44\u6e90\u4fe1\u606f\u3002<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u95ee\u9898\u4e8c\uff0c\u6b63\u786e\u7b54\u6848\uff1aB\u3001D<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7b54\u6848\u89e3\u6790\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Kafka\u53ea\u4fdd\u8bc1\u4e00\u4e2a\u5206\u533a\u5185\u7684\u6d88\u606f\u6709\u5e8f\uff0c\u4e0d\u80fd\u4fdd\u8bc1\u4e00\u4e2atopic\u7684\u4e0d\u540c\u5206\u533a\u4e4b\u95f4\u7684\u6d88\u606f\u6709\u5e8f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e3a\u4e86\u4fdd\u8bc1\u8f83\u9ad8\u7684\u5904\u7406\u6548\u7387\uff0c\u6240\u6709\u7684\u6d88\u606f\u8bfb\u5199\u90fd\u662f\u5728\u4e3bpatition\u4e2d\u8fdb\u884c\uff0c\u5176\u4ed6\u526f\u672c\u5206\u533a\u53ea\u4f1a\u4ece\u4e3b\u5206\u533a\u590d\u5236\u6570\u636e\u3002Kafka\u4f1a\u5728Zookeeper\u4e0a\u9488\u5bf9\u6bcf\u4e2aTopic\u7ef4\u62a4\u4e00\u4e2a\u79f0\u4e3aISR(in-sync replica)\uff0c\u5c31\u662f\u5df2\u540c\u6b65\u7684\u526f\u672c\u96c6\u3002\u5982\u679c\u67d0\u4e2a\u4e3b\u5206\u533a\u4e0d\u53ef\u7528\u4e86\uff0cKafka\u5c31\u4f1a\u4eceISR\u96c6\u5408\u4e2d\u9009\u62e9\u4e00\u4e2a\u526f\u672c\u4f5c\u4e3a\u65b0\u7684\u4e3b\u5206\u533a\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6d88\u606f\u7684\u53d1\u9001\u6709\u4e09\u79cd\u65b9\u5f0f\uff1a\u540c\u6b65\u3001\u5f02\u6b65\u4ee5\u53caoneway\u3002\u540c\u6b65\u6a21\u5f0f\u4e0b\u540e\u53f0\u7ebf\u7a0b\u4e2d\u53d1\u9001\u6d88\u606f\u65f6\u540c\u6b65\u83b7\u53d6\u7ed3\u679c\uff0c\u8fd9\u4e5f\u662f\u9ed8\u8ba4\u6a21\u5f0f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f02\u6b65\u7684\u6a21\u5f0f\u5141\u8bb8\u751f\u4ea7\u8005\u6279\u91cf\u53d1\u9001\u6570\u636e\uff0c\u53ef\u4ee5\u6781\u5927\u7684\u63d0\u9ad8\u6027\u80fd\uff0c\u4f46\u662f\u4f1a\u589e\u52a0\u4e22\u5931\u6570\u636e\u7684\u98ce\u9669\u3002oneway\u6a21\u5f0f\u53ea\u53d1\u9001\u6d88\u606f\u4e0d\u9700\u8981\u8fd4\u56de\u53d1\u9001\u7ed3\u679c\uff0c\u6d88\u606f\u53ef\u9760\u6027\u6700\u4f4e\uff0c\u4f46\u662f\u4f4e\u5ef6\u8fdf\u3001\u9ad8\u541e\u5410\uff0c\u9002\u7528\u4e8e\u5bf9\u53ef\u9760\u6027\u8981\u6c42\u4e0d\u9ad8\u7684\u573a\u666f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u95ee\u9898\u4e09\uff0c\u6b63\u786e\u7b54\u6848\uff1aA\u3001B\u3001D<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7b54\u6848\u89e3\u6790\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5feb\u901f\u6392\u5e8f\u65f6\u95f4\u590d\u6742\u5ea6\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>\u6700\u4f18\u60c5\u51b5\uff1a\u88ab\u9009\u51fa\u6765\u7684\u57fa\u51c6\u503c\u90fd\u662f\u5f53\u524d\u5b50\u6570\u7ec4\u7684\u4e2d\u95f4\u6570\u3002<br>\n\u4e0d\u65ad\u5730\u628a\u4e00\u4e2a\u89c4\u6a21\u4e3a n \u7684\u95ee\u9898\u5206\u89e3\u6210\u89c4\u6a21\u4e3a n\/2 \u7684\u95ee\u9898\uff0c\u4e00\u76f4\u5206\u89e3\u5230\u89c4\u6a21\u5927\u5c0f\u4e3a 1\u3002\u5982\u679c n \u7b49\u4e8e 2\uff0c\u53ea\u9700\u8981\u5206\u4e00\u6b21;\u5982\u679c n \u7b49\u4e8e 4\uff0c\u9700\u8981\u5206 2 \u6b21\uff0c\u4ee5\u6b64\u7c7b\u63a8\uff0c\u5bf9\u4e8e\u89c4\u6a21\u4e3a n \u7684\u95ee\u9898\uff0c\u4e00\u5171\u8981\u8fdb\u884c log(n) \u6b21\u7684\u5207\u5206\u3002<br>\n\u628a\u89c4\u6a21\u5927\u5c0f\u4e3a n \u7684\u95ee\u9898\u5206\u89e3\u6210 n\/2 \u7684\u4e24\u4e2a\u5b50\u95ee\u9898\u65f6\uff0c\u548c\u57fa\u51c6\u503c\u8fdb\u884c\u4e86 n-1 \u6b21\u6bd4\u8f83\uff0c\u590d\u6742\u5ea6\u5c31\u662f O(n)\u3002<br>\n\u56e0\u6b64\uff0c\u5728\u6700\u4f18\u60c5\u51b5\u4e0b\uff0c\u5feb\u901f\u6392\u5e8f\u7684\u590d\u6742\u5ea6\u662f O(nlogn)\u3002<\/li><li>\u6700\u574f\u60c5\u51b5\uff1a\u57fa\u51c6\u503c\u9009\u62e9\u4e86\u5b50\u6570\u7ec4\u91cc\u7684\u6700\u5927\u6216\u8005\u6700\u5c0f\u503c<br>\n\u6bcf\u6b21\u90fd\u628a\u5b50\u6570\u7ec4\u5206\u6210\u4e86\u4e24\u4e2a\u66f4\u5c0f\u7684\u5b50\u6570\u7ec4\uff0c\u5176\u4e2d\u4e00\u4e2a\u7684\u957f\u5ea6\u4e3a 1\uff0c\u53e6\u5916\u4e00\u4e2a\u7684\u957f\u5ea6\u53ea\u6bd4\u539f\u5b50\u6570\u7ec4\u5c11 1\uff0c\u8fd9\u6837\u5c31\u9700\u8981n\u6b21\u7684\u5207\u5206\u3002<br>\n\u56e0\u6b64\uff0c\u7b97\u6cd5\u590d\u6742\u5ea6\u4e3a O(n\u7684\u5e73\u65b9)\u3002<\/li><\/ol>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u95ee\u9898\u56db\uff0c\u6b63\u786e\u7b54\u6848\uff1aA\u3001B\u3001C\u3001D<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7b54\u6848\u89e3\u6790\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u865a\u62df\u673a\u6808 \u4e5f\u53eb\u65b9\u6cd5\u6808\uff0c\u662f\u7ebf\u7a0b\u79c1\u6709\u7684\uff0c\u7ebf\u7a0b\u5728\u6267\u884c\u6bcf\u4e2a\u65b9\u6cd5\u65f6\u90fd\u4f1a\u540c\u65f6\u521b\u5efa\u4e00\u4e2a\u6808\u5e27\uff0c\u7528\u6765\u5b58\u50a8\u5c40\u90e8\u53d8\u91cf\u8868\u3001\u64cd\u4f5c\u6808\u3001\u52a8\u6001\u94fe\u63a5\u3001\u65b9\u6cd5\u51fa\u53e3\u7b49\u4fe1\u606f\u3002\u8c03\u7528\u65b9\u6cd5\u65f6\u6267\u884c\u5165\u6808\uff0c\u65b9\u6cd5\u8fd4\u56de\u65f6\u6267\u884c\u51fa\u6808\u3002<br>\n\u672c\u5730\u65b9\u6cd5\u6808\u4e0e\u865a\u62df\u673a\u6808\u7c7b\u4f3c\uff0c\u4e5f\u662f\u7528\u6765\u4fdd\u5b58\u7ebf\u7a0b\u6267\u884c\u65b9\u6cd5\u65f6\u7684\u4fe1\u606f\uff0c\u4e0d\u540c\u7684\u662f\uff0c\u6267\u884cjava\u65b9\u6cd5\u4f7f\u7528\u865a\u62df\u673a\u6808\uff0c\u800c\u6267\u884cnative\u65b9\u6cd5\u4f7f\u7528\u672c\u5730\u65b9\u6cd5\u6808\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7a0b\u5e8f\u8ba1\u6570\u5668 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\u4e5f\u662f\u5404\u4e2a\u7ebf\u7a0b\u5171\u4eab\u7684\u5185\u5b58\u533a\u57df\uff0c\u53c8\u53eb\u975e\u5806\u533a\u3002\u7528\u4e8e\u5b58\u50a8\u5df2\u88ab\u865a\u62df\u673a\u52a0\u8f7d\u7684\u7c7b\u4fe1\u606f\u3001\u5e38\u91cf\u3001\u9759\u6001\u53d8\u91cf\u3001\u5373\u65f6\u7f16\u8bd1\u5668\u7f16\u8bd1\u540e\u7684\u4ee3\u7801\u7b49\u6570\u636e\uff0cJDK7\u4e2d\u7684\u6c38\u4e45\u4ee3\u548cJDK8\u4e2d\u7684Metaspace\u90fd\u662f\u65b9\u6cd5\u533a\u7684\u4e00\u79cd\u5b9e\u73b0\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u95ee\u9898\u4e94\uff1a\u6b63\u786e\u7b54\u6848\uff1aA\u3001D<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7b54\u6848\u89e3\u6790\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A.\u7b49\u5f852\u500d\u6700\u5927\u62a5\u6587\u6bb5\u751f\u5b58\u65f6\u95f4\u4e4b\u540e\u5728\u5173\u95ed\u94fe\u63a5\uff0c\u539f\u56e0\u6709\u4e24\u4e2a\uff1a<br>\n        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\u4e8c\u3001\u4fdd\u8bc1\u8fd9\u6b21\u8fde\u63a5\u7684\u91cd\u590d\u6570\u636e\u6bb5\u4ece\u7f51\u7edc\u4e2d\u6d88\u5931\uff0c\u9632\u6b62\u7aef\u53e3\u88ab\u91cd\u7528\u65f6\u53ef\u80fd\u4ea7\u751f\u6570\u636e\u6df7\u6dc6<br>\nB.shutdown\u53ef\u4ee5\u4f7fTCP\u534a\u53cc\u5de5\uff0c\u4f46\u662f\u5982\u679c\u4e4b\u524d\u8c03\u7528\u4e86close\uff0c\u5219\u76f4\u63a5\u5173\u95ed\u4e86socket<br>\nC.\u6536\u5230\u4e86ack\u4e4b\u540e\u7684\u72b6\u6001\uff0c\u4e5f\u662f\u4e0d\u80fd\u53d1\u53ea\u80fd\u6536\uff0c\u8fdb\u5165FIN_WAIT_2<br>\n\u901a\u4fe1\u4e2dclient\u548cserver\u4e24\u7aef\u7684\u94fe\u63a5\u90fd\u662fESTABLISHED\u72b6\u6001\uff0c\u7136\u540eclient\u5148\u4e3b\u52a8\u53d1\u8d77\u4e86\u5173\u95ed\u94fe\u63a5\u8bf7\u6c42\uff0cclient\u5411server\u53d1\u9001\u4e86\u4e00\u4e2afin\u5305\uff0c\u8868\u793aclient\u7aef\u5df2\u7ecf\u6ca1\u6709\u6570\u636e\u8981\u53d1\u9001\u4e86\uff0c\u7136\u540eclient\u8fdb\u5165\u4e86FIN_WAIT_1\u72b6\u6001\u3002<br>\nserver\u7aef\u6536\u5230fin\u540e\uff0c\u8fd4\u56deack\uff0c\u7136\u540e\u8fdb\u5165CLOSE_WAIT\u72b6\u6001\u3002\u6b64\u65f6server\u5c5e\u4e8e\u534a\u5173\u95ed\u72b6\u6001\uff0c\u56e0\u4e3a\u6b64\u65f6client\u5411server\u65b9\u5411\u5df2\u7ecf\u4e0d\u4f1a\u53d1\u9001\u6570\u636e\u4e86\uff0c\u53ef\u662fserver\u5411client\u7aef\u53ef\u80fd\u8fd8\u6709\u6570\u636e\u8981\u53d1\u9001\u3002<br>\n\u5f53server\u7aef\u6570\u636e\u53d1\u9001\u5b8c\u6bd5\u540e\uff0cserver\u7aef\u4f1a\u5411client\u7aef\u53d1\u9001fin\uff0c\u8868\u793aserver\u7aef\u4e5f\u6ca1\u6709\u6570\u636e\u8981\u53d1\u9001\u4e86\uff0c\u6b64\u65f6server\u8fdb\u5165LAST_ACK\u72b6\u6001\uff0c\u5c31\u7b49\u5f85client\u7684\u5e94\u7b54\u5c31\u53ef\u4ee5\u5173\u95ed\u94fe\u63a5\u4e86\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">client\u7aef\u6536\u5230server\u7aef\u7684fin\u540e\uff0c\u56de\u590dack\uff0c\u7136\u540e\u8fdb\u5165TIME_WAIT\u72b6\u6001\u3002TIME_WAIT\u72b6\u6001\u4e0b\u9700\u8981\u7b49\u5f852\u500d\u7684\u6700\u5927\u62a5\u6587\u6bb5\u751f\u5b58\u65f6\u95f4\uff0c\u6765\u4fdd\u8bc1\u94fe\u63a5\u7684\u53ef\u9760\u5173\u95ed\u3002\u4e4b\u540e\u624d\u4f1a\u8fdb\u5165CLOSED\u5173\u95ed\u72b6\u6001\u3002\u800cserver\u7aef\u6536\u5230ack\u540e\u76f4\u63a5\u5c31\u8fdb\u5165CLOSED\u72b6\u6001\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D.\u7531\u4e8eTCP\u7684\u4e0b\u5c42\u7f51\u7edc\uff08IP\uff09\u53ef\u80fd\u51fa\u73b0\u4e22\u5931\u3001\u91cd\u590d\u6216\u5931\u5e8f\u7684\u60c5\u51b5\uff0cTCP\u534f\u8bae\u63d0\u4f9b\u53ef\u9760\u6570\u636e\u4f20\u8f93\u670d\u52a1\u3002\u4e3a\u4fdd\u8bc1\u6570\u636e\u4f20\u8f93\u7684\u6b63\u786e\u6027\uff0cTCP\u4f1a\u91cd\u4f20\u5176\u8ba4\u4e3a\u5df2\u4e22\u5931\uff08\u5305\u62ec\u62a5\u6587\u4e2d\u7684\u6bd4\u7279\u9519\u8bef\uff09\u7684\u5305\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u95ee\u9898\u516d\uff0c\u6b63\u786e\u7b54\u6848\uff1aA\u3001B\u3001C<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7b54\u6848\u89e3\u6790\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">b+\u6811\u66f4\u9002\u5408\u7d22\u5f15\u7cfb\u7edf\uff0c\u539f\u56e0\u6709\uff1a<br>1\u3001\u7531\u4e8e\u53f6\u8282\u70b9\u4e4b\u95f4\u6709\u6307\u9488\u76f8\u8fde\uff0cb+\u6811\u66f4\u9002\u5408\u8303\u56f4\u68c0\u7d22;<br>2\u3001\u7531\u4e8e\u975e\u9875\u8282\u70b9\u53ea\u4fdd\u5b58\u5173\u952e\u5b57\u548c\u6307\u9488\uff0c\u540c\u6837\u5927\u5c0f\u975e\u53f6\u8282\u70b9\uff0cb+\u6811\u53ef\u4ee5\u5bb9\u7eb3\u66f4\u591a\u7684\u5173\u952e\u5b57\uff0c\u53ef\u4ee5\u964d\u4f4e\u6811\u9ad8\uff0c\u67e5\u8be2\u65f6\u78c1\u76d8\u8bfb\u5199\u4ee3\u4ef7\u66f4\u4f4e;<br>3\u3001B+\u6811\u7684\u67e5\u8be2\u6548\u7387\u6bd4\u8f83\u7a33\u5b9a\u3002\u4efb\u4f55\u5173\u952e\u5b57\u7684\u67e5\u627e\u5fc5\u987b\u8d70\u4e00\u6761\u4ece\u6839\u7ed3\u70b9\u5230\u53f6\u5b50\u7ed3\u70b9\u7684\u8def\u3002\u6240\u6709\u5173\u952e\u5b57\u67e5\u8be2\u7684\u8def\u5f84\u957f\u5ea6\u76f8\u540c\uff0c\u6548\u7387\u76f8\u5f53\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u95ee\u9898\u4e03\uff0c\u6b63\u786e\u7b54\u6848\uff1aA\u3001B\u3001C\u3001D<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7b54\u6848\u89e3\u6790\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">netty\u7ebf\u7a0b\u6a21\u578b\u91c7\u7528\u201c\u670d\u52a1\u7aef\u76d1\u542c\u7ebf\u7a0b\u201d\u548c\u201cIO\u7ebf\u7a0b\u201d\u5206\u79bb\u7684\u65b9\u5f0f\uff0cboss\u7ebf\u7a0b\u7ec4\u8d1f\u8d23\u76d1\u542c\u4e8b\u4ef6\uff0c\u521b\u5efasocket\u5e76\u7ed1\u5b9a\u5230worker\u7ebf\u7a0b\u7ec4\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">worker\u7ebf\u7a0b\u7ec4\u8d1f\u8d23io\u5904\u7406\u3002\u7ebf\u7a0b\u7ec4\u7531eventLoopGroup\u5b9e\u73b0\uff0c\u5176\u4e2d\u5305\u542b\u4e86\u591a\u4e2aEventLoop\u4e8b\u4ef6\u5904\u7406\u5668\uff0c\u6bcf\u4e2aEventLoop\u5305\u542b\u4e00\u4e2a\u5904\u7406\u7ebf\u7a0b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u901a\u5e38\u60c5\u51b5\u4e0b\u5728NIO\u975e\u963b\u585e\u6a21\u5f0f\u4e0b\uff0cNetty\u4e3a\u6bcf\u4e2aChannel\u5206\u914d\u4e00\u4e2aEventLoop\uff0c\u5e76\u4e14\u5b83\u7684\u6574\u4e2a\u751f\u547d\u5468\u671f\u4e2d\u7684\u4e8b\u4ef6\u90fd\u7531\u8fd9\u4e2aEventLoop\u6765\u5904\u7406\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> \u4e00\u4e2aeventLoop\u53ef\u4ee5\u7ed1\u5b9a\u591a\u4e2aChannel\u3002<\/p>\n\n\n\n<p 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