{"id":2065,"date":"2023-06-22T09:14:38","date_gmt":"2023-06-22T01:14:38","guid":{"rendered":"http:\/\/viplao.com\/?p=2065"},"modified":"2023-06-22T09:14:40","modified_gmt":"2023-06-22T01:14:40","slug":"flink-sql-%e9%97%ae%e9%a2%98%e5%89%96%e6%9e%90%e5%8f%8a%e8%a7%a3%e5%86%b3%e5%ae%9e%e8%b7%b5","status":"publish","type":"post","link":"http:\/\/viplao.com\/index.php\/2023\/06\/22\/flink-sql-%e9%97%ae%e9%a2%98%e5%89%96%e6%9e%90%e5%8f%8a%e8%a7%a3%e5%86%b3%e5%ae%9e%e8%b7%b5\/","title":{"rendered":"Flink SQL &#8211; \u95ee\u9898\u5256\u6790\u53ca\u89e3\u51b3\u5b9e\u8df5"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_71 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u6587\u7ae0\u76ee\u5f55<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"http:\/\/viplao.com\/index.php\/2023\/06\/22\/flink-sql-%e9%97%ae%e9%a2%98%e5%89%96%e6%9e%90%e5%8f%8a%e8%a7%a3%e5%86%b3%e5%ae%9e%e8%b7%b5\/#1%E7%AE%80%E4%BB%8B\" title=\"1.\u7b80\u4ecb\">1.\u7b80\u4ecb<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"http:\/\/viplao.com\/index.php\/2023\/06\/22\/flink-sql-%e9%97%ae%e9%a2%98%e5%89%96%e6%9e%90%e5%8f%8a%e8%a7%a3%e5%86%b3%e5%ae%9e%e8%b7%b5\/#2Flink%E5%9F%BA%E6%9C%AC%E6%A6%82%E5%BF%B5\" title=\"2.Flink\u57fa\u672c\u6982\u5ff5\">2.Flink\u57fa\u672c\u6982\u5ff5<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"http:\/\/viplao.com\/index.php\/2023\/06\/22\/flink-sql-%e9%97%ae%e9%a2%98%e5%89%96%e6%9e%90%e5%8f%8a%e8%a7%a3%e5%86%b3%e5%ae%9e%e8%b7%b5\/#21_%E6%B5%81Stream\" title=\"2.1 \u6d41(Stream)\">2.1 \u6d41(Stream)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"http:\/\/viplao.com\/index.php\/2023\/06\/22\/flink-sql-%e9%97%ae%e9%a2%98%e5%89%96%e6%9e%90%e5%8f%8a%e8%a7%a3%e5%86%b3%e5%ae%9e%e8%b7%b5\/#22_%E7%8A%B6%E6%80%81State\" title=\"2.2 \u72b6\u6001(State)\">2.2 \u72b6\u6001(State)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"http:\/\/viplao.com\/index.php\/2023\/06\/22\/flink-sql-%e9%97%ae%e9%a2%98%e5%89%96%e6%9e%90%e5%8f%8a%e8%a7%a3%e5%86%b3%e5%ae%9e%e8%b7%b5\/#23_%E6%97%B6%E9%97%B4%E8%AF%AD%E4%B9%89Time\" title=\"2.3 \u65f6\u95f4\u8bed\u4e49(Time)\">2.3 \u65f6\u95f4\u8bed\u4e49(Time)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"http:\/\/viplao.com\/index.php\/2023\/06\/22\/flink-sql-%e9%97%ae%e9%a2%98%e5%89%96%e6%9e%90%e5%8f%8a%e8%a7%a3%e5%86%b3%e5%ae%9e%e8%b7%b5\/#24_Watermark\" title=\"2.4 Watermark\">2.4 Watermark<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"http:\/\/viplao.com\/index.php\/2023\/06\/22\/flink-sql-%e9%97%ae%e9%a2%98%e5%89%96%e6%9e%90%e5%8f%8a%e8%a7%a3%e5%86%b3%e5%ae%9e%e8%b7%b5\/#25_API%E5%B1%82\" title=\"2.5 API\u5c42\">2.5 API\u5c42<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"http:\/\/viplao.com\/index.php\/2023\/06\/22\/flink-sql-%e9%97%ae%e9%a2%98%e5%89%96%e6%9e%90%e5%8f%8a%e8%a7%a3%e5%86%b3%e5%ae%9e%e8%b7%b5\/#3Flink%E5%AE%9E%E6%97%B6%E8%AE%A1%E7%AE%97%E5%B8%B8%E8%A7%81%E9%97%AE%E9%A2%98%E5%88%86%E6%9E%90\" title=\"3.Flink\u5b9e\u65f6\u8ba1\u7b97\u5e38\u89c1\u95ee\u9898\u5206\u6790\">3.Flink\u5b9e\u65f6\u8ba1\u7b97\u5e38\u89c1\u95ee\u9898\u5206\u6790<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"http:\/\/viplao.com\/index.php\/2023\/06\/22\/flink-sql-%e9%97%ae%e9%a2%98%e5%89%96%e6%9e%90%e5%8f%8a%e8%a7%a3%e5%86%b3%e5%ae%9e%e8%b7%b5\/#31_%E6%95%B0%E6%8D%AE%E4%B9%B1%E5%BA%8F%E9%97%AE%E9%A2%98%E5%88%86%E6%9E%90\" title=\"3.1 \u6570\u636e\u4e71\u5e8f\u95ee\u9898\u5206\u6790\">3.1 \u6570\u636e\u4e71\u5e8f\u95ee\u9898\u5206\u6790<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"http:\/\/viplao.com\/index.php\/2023\/06\/22\/flink-sql-%e9%97%ae%e9%a2%98%e5%89%96%e6%9e%90%e5%8f%8a%e8%a7%a3%e5%86%b3%e5%ae%9e%e8%b7%b5\/#32_Flink%E5%A4%A7%E7%8A%B6%E6%80%81%E5%9C%BA%E6%99%AF%E5%8F%8A%E9%97%AE%E9%A2%98%E5%88%86%E6%9E%90\" title=\"3.2 Flink\u5927\u72b6\u6001\u573a\u666f\u53ca\u95ee\u9898\u5206\u6790\">3.2 Flink\u5927\u72b6\u6001\u573a\u666f\u53ca\u95ee\u9898\u5206\u6790<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"http:\/\/viplao.com\/index.php\/2023\/06\/22\/flink-sql-%e9%97%ae%e9%a2%98%e5%89%96%e6%9e%90%e5%8f%8a%e8%a7%a3%e5%86%b3%e5%ae%9e%e8%b7%b5\/#33_%E6%95%B0%E6%8D%AE%E5%80%BE%E6%96%9C%E9%97%AE%E9%A2%98\" title=\"3.3 \u6570\u636e\u503e\u659c\u95ee\u9898\">3.3 \u6570\u636e\u503e\u659c\u95ee\u9898<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"http:\/\/viplao.com\/index.php\/2023\/06\/22\/flink-sql-%e9%97%ae%e9%a2%98%e5%89%96%e6%9e%90%e5%8f%8a%e8%a7%a3%e5%86%b3%e5%ae%9e%e8%b7%b5\/#4%E5%AE%9E%E6%97%B6%E8%AE%A1%E7%AE%97%E5%B8%B8%E8%A7%81%E9%97%AE%E9%A2%98%E7%9A%84%E8%A7%A3%E5%86%B3%E6%96%B9%E6%A1%88\" title=\"4.\u5b9e\u65f6\u8ba1\u7b97\u5e38\u89c1\u95ee\u9898\u7684\u89e3\u51b3\u65b9\u6848\">4.\u5b9e\u65f6\u8ba1\u7b97\u5e38\u89c1\u95ee\u9898\u7684\u89e3\u51b3\u65b9\u6848<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"http:\/\/viplao.com\/index.php\/2023\/06\/22\/flink-sql-%e9%97%ae%e9%a2%98%e5%89%96%e6%9e%90%e5%8f%8a%e8%a7%a3%e5%86%b3%e5%ae%9e%e8%b7%b5\/#41_%E6%95%B0%E6%8D%AE%E4%B9%B1%E5%BA%8F%E5%9C%BA%E6%99%AF%E7%9A%84%E5%A4%84%E7%90%86\" title=\"4.1 \u6570\u636e\u4e71\u5e8f\u573a\u666f\u7684\u5904\u7406\">4.1 \u6570\u636e\u4e71\u5e8f\u573a\u666f\u7684\u5904\u7406<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"http:\/\/viplao.com\/index.php\/2023\/06\/22\/flink-sql-%e9%97%ae%e9%a2%98%e5%89%96%e6%9e%90%e5%8f%8a%e8%a7%a3%e5%86%b3%e5%ae%9e%e8%b7%b5\/#421_DataStream_API%E5%A4%84%E7%90%86%E4%B9%B1%E5%BA%8F\" title=\"4.2.1 DataStream API\u5904\u7406\u4e71\u5e8f\">4.2.1 DataStream API\u5904\u7406\u4e71\u5e8f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"http:\/\/viplao.com\/index.php\/2023\/06\/22\/flink-sql-%e9%97%ae%e9%a2%98%e5%89%96%e6%9e%90%e5%8f%8a%e8%a7%a3%e5%86%b3%e5%ae%9e%e8%b7%b5\/#42_Flink%E5%A4%A7%E7%8A%B6%E6%80%81%E9%97%AE%E9%A2%98%E8%A7%A3%E5%86%B3%E6%96%B9%E6%A1%88\" title=\"4.2 Flink\u5927\u72b6\u6001\u95ee\u9898\u89e3\u51b3\u65b9\u6848\">4.2 Flink\u5927\u72b6\u6001\u95ee\u9898\u89e3\u51b3\u65b9\u6848<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"http:\/\/viplao.com\/index.php\/2023\/06\/22\/flink-sql-%e9%97%ae%e9%a2%98%e5%89%96%e6%9e%90%e5%8f%8a%e8%a7%a3%e5%86%b3%e5%ae%9e%e8%b7%b5\/#43_%E6%95%B0%E6%8D%AE%E5%80%BE%E6%96%9C%E9%97%AE%E9%A2%98%E8%A7%A3%E5%86%B3%E6%96%B9%E6%A1%88\" title=\"4.3 \u6570\u636e\u503e\u659c\u95ee\u9898\u89e3\u51b3\u65b9\u6848\">4.3 \u6570\u636e\u503e\u659c\u95ee\u9898\u89e3\u51b3\u65b9\u6848<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"http:\/\/viplao.com\/index.php\/2023\/06\/22\/flink-sql-%e9%97%ae%e9%a2%98%e5%89%96%e6%9e%90%e5%8f%8a%e8%a7%a3%e5%86%b3%e5%ae%9e%e8%b7%b5\/#5%E6%80%BB%E7%BB%93\" title=\"5.\u603b\u7ed3\">5.\u603b\u7ed3<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1%E7%AE%80%E4%BB%8B\"><\/span>1.\u7b80\u4ecb<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u968f\u7740\u5174\u76db\u4f18\u9009\u4e1a\u52a1\u7684\u53d1\u5c55\uff0c\u5bf9\u5b9e\u65f6\u8ba1\u7b97\u7684\u9700\u6c42\u4e5f\u8d8a\u6765\u8d8a\u591a\uff0c\u76ee\u524dFlink\u5df2\u5e7f\u6cdb\u5e94\u7528\u4e8e\u5b9e\u65f6ETL\uff0c\u5b9e\u65f6\u6570\u4ed3\u3001\u7279\u5f81\u5de5\u7a0b\u548c\u5728\u7ebf\u6570\u636e\u670d\u52a1\u7b49\u4e1a\u52a1\u573a\u666f\u3002<\/p>\n\n\n\n<p>\u672c\u6587\u9996\u5148\u7b80\u5355\u4ecb\u7ecd\u4e86Flink\u5b9e\u65f6\u8ba1\u7b97\u57fa\u672c\u6982\u5ff5\uff0c\u7136\u540e\u5f15\u51fa\u57fa\u4e8eFlink\u8fdb\u884c\u5b9e\u65f6\u8ba1\u7b97\u5f00\u53d1\u8fc7\u7a0b\u5f53\u4e2d\u78b0\u5230\u7684\u4e00\u4e9b\u95ee\u9898\uff0c\u901a\u8fc7\u5bf9\u8fd9\u4e9b\u5e38\u89c1\u5b9e\u65f6\u8ba1\u7b97\u95ee\u9898\u7684\u4ea7\u751f\u539f\u56e0\u8fdb\u884c\u6df1\u5165\u5206\u6790\uff0c\u8fdb\u800c\u7ed9\u51fa\u76f8\u5e94\u95ee\u9898\u7684\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2Flink%E5%9F%BA%E6%9C%AC%E6%A6%82%E5%BF%B5\"><\/span>2.Flink\u57fa\u672c\u6982\u5ff5<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Flink\u662f\u4e00\u4e2a\u5206\u5e03\u5f0f\u5927\u6570\u636e\u5904\u7406\u5f15\u64ce\u548c\u6846\u67b6\uff0c\u53ef\u5bf9\u6709\u65e0\u754c\u548c\u6709\u754c\u6570\u636e\u6d41\u8fdb\u884c\u6709\u72b6\u6001\u7684\u8ba1\u7b97\uff0c\u80fd\u591f\u90e8\u7f72\u5728\u5404\u79cd\u96c6\u7fa4\u73af\u5883\u4e2d\uff0c\u5bf9\u5404\u79cd\u89c4\u6a21\u5927\u5c0f\u7684\u6570\u636e\u8fdb\u884c\u5feb\u901f\u8ba1\u7b97\u3002<\/p>\n\n\n\n<p>\u5728\u8fdb\u884cFlink\u5e94\u7528\u5f00\u53d1\u524d\uff0c\u6211\u4eec\u5148\u7406\u89e3\u6d41treams\u3001\u72b6\u6001State\u3001\u65f6\u95f4Time \uff0cWatermark\u7b49Flink\u57fa\u7840\u8bed\u4e49\u6982\u5ff5\u4ee5\u53caFlink \u517c\u987e\u7075\u6d3b\u6027\u548c\u65b9\u4fbf\u6027\u7684\u591a\u5c42\u6b21API\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"21_%E6%B5%81Stream\"><\/span><strong>2.1 \u6d41(Stream)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Stream\u5206\u4e3a\u6709\u9650\u6570\u636e\u6d41\u4e0e\u65e0\u9650\u6570\u636e\u6d41\uff0cunbounded stream \u662f\u6709\u59cb\u65e0\u7ec8\u7684\u6570\u636e\u6d41\uff0c\u5373\u65e0\u9650\u6570\u636e\u6d41\uff1b\u800cbounded stream \u662f\u9650\u5b9a\u5927\u5c0f\u7684\u6709\u59cb\u6709\u7ec8\u7684\u6570\u636e\u96c6\u5408\uff0c\u5373\u6709\u9650\u6570\u636e\u6d41\uff0c\u4e8c\u8005\u7684\u533a\u522b\u5728\u4e8e\u65e0\u9650\u6570\u636e\u6d41\u7684\u6570\u636e\u4f1a\u968f\u65f6\u95f4\u7684\u63a8\u6f14\u800c\u6301\u7eed\u589e\u52a0\uff0c\u8ba1\u7b97\u6301\u7eed\u8fdb\u884c\u4e14\u4e0d\u5b58\u5728\u7ed3\u675f\u7684\u72b6\u6001\uff0c\u76f8\u5bf9\u7684\u6709\u9650\u6570\u636e\u6d41\u6570\u636e\u5927\u5c0f\u56fa\u5b9a\uff0c\u8ba1\u7b97\u6700\u7ec8\u4f1a\u5b8c\u6210\u5e76\u5904\u4e8e\u7ed3\u675f\u7684\u72b6\u6001\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"22_%E7%8A%B6%E6%80%81State\"><\/span><strong>2.2 \u72b6\u6001(State)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u72b6\u6001\u662f\u8ba1\u7b97\u8fc7\u7a0b\u4e2d\u7684\u4ea7\u751f\u7684\u8ba1\u7b97\u7ed3\u679c\uff0c\u5728\u5bb9\u9519\u6062\u590d\u548cCheckpoint\u4e2d\u6709\u91cd\u8981\u7684\u4f5c\u7528\u3002\u6d41\u8ba1\u7b97\u5728\u672c\u8d28\u4e0a\u662fIncremental Processing\uff0c\u56e0\u6b64\u9700\u8981\u5c06\u8ba1\u7b97\u7684\u4e2d\u95f4\u7ed3\u679c\u4fdd\u5b58\u5230\u72b6\u6001\u4e2d\uff0c\u4f8b\u5982\u6309\u5929\u7edf\u8ba1\u6bcf\u4e2a\u533a\u57df\u7684GMV\uff0c\u56e0\u6b64\u5f53\u8ba2\u5355\u6570\u636e\u5230\u8fbe\u65f6\uff0c\u9700\u8981\u5c06\u524d\u9762\u8ba1\u7b97\u7684\u8be5\u8ba2\u5355\u6240\u5c5e\u533a\u57df\u7684GMV\u6570\u636e\u4ece\u72b6\u6001\u4e2d\u8bfb\u53d6\u51fa\u6765\uff0c\u7136\u540e\u518d\u4e0e\u8be5\u8ba2\u5355\u989d\u8fdb\u884c\u7d2f\u52a0\uff0c\u7d2f\u52a0\u5b8c\u540e\u5c06\u7ed3\u679c\u518d\u6b21\u66f4\u65b0\u5230\u72b6\u6001\u4e2d\uff1bFlink\u6b63\u662f\u901a\u8fc7\u5c06\u8ba1\u7b97\u4e2d\u95f4\u7ed3\u679c\u4fdd\u5b58\u5230\u72b6\u6001\u540e\u7aef\u4e2d\uff0c\u624d\u4fdd\u8bc1\u5728\u6574\u4e2a\u5206\u5e03\u5f0f\u7cfb\u7edf\u8fd0\u884c\u5931\u8d25\u6216\u8005\u6302\u6389\u7684\u60c5\u51b5\u4e0b\u505a\u5230Exactly-once\uff0c\u589e\u5f3a\u5bb9\u707e\u7684\u6548\u679c\u3002\u56fe2-1\u662f\u7b97\u5b50\u5728\u805a\u5408\u8ba1\u7b97\u65f6\uff0c\u8bfb\u5199state\u72b6\u6001\u793a\u610f\u56fe\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic1.zhimg.com\/80\/v2-05a0da363bedde212ef65bcc1519637c_720w.webp\" alt=\"\"\/><figcaption class=\"wp-element-caption\">\u56fe2-1\u7b97\u5b50\u8bfb\u5199\u72b6\u6001\u793a\u610f\u56fe<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"23_%E6%97%B6%E9%97%B4%E8%AF%AD%E4%B9%89Time\"><\/span><strong>2.3 \u65f6\u95f4\u8bed\u4e49(Time)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Flink\u7684\u65f6\u95f4\u8bed\u4e49\u5206\u4e3aEvent time\u3001Ingestion time\u548cProcessing time\u3002Flink\u7684\u65e0\u9650\u6570\u636e\u6d41\u662f\u4e00\u4e2a\u6301\u7eed\u7684\u8fc7\u7a0b\uff0c\u65f6\u95f4\u662f\u6211\u4eec\u5224\u65ad\u4e1a\u52a1\u72b6\u6001\u662f\u5426\u6ede\u540e\uff0c\u6570\u636e\u5904\u7406\u662f\u5426\u53ca\u65f6\u7684\u91cd\u8981\u4f9d\u636e\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-f058441d9dec679a5504e4ae302fcf52_720w.webp\" alt=\"\"\/><figcaption class=\"wp-element-caption\">\u56fe2-2 Flink\u65f6\u95f4\u8bed\u4e49<\/figcaption><\/figure>\n\n\n\n<p>Event Time\u662f\u5728\u4e8b\u4ef6\u751f\u4ea7\u7aef\u4ea7\u751f\u8be5\u4e8b\u4ef6\u7684\u65f6\u95f4\uff0c\u4f8b\u5982\u7528\u6237\u4e0b\u7684\u8ba2\u5355\uff0c\u8ba2\u5355\u7684\u4e0b\u5355\u65f6\u95f4\u5c31\u662f\u4e8b\u4ef6\u4ea7\u751f\u7684\u65f6\u95f4Event Time\u3002<\/p>\n\n\n\n<p>Ingestion time\u662f\u4e8b\u4ef6\u8fdb\u5165Flink\u7684\u65f6\u95f4\u3002<\/p>\n\n\n\n<p>Processing time\u662f\u4e8b\u4ef6\u88ab\u5904\u7406\u65f6\uff0c\u5f53\u524d\u7684\u7cfb\u7edf\u65f6\u95f4\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"24_Watermark\"><\/span><strong>2.4 Watermark<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u6d41\u5904\u7406\u4ece\u4e8b\u4ef6\u4ea7\u751f\uff0c\u5230\u6d41\u7ecfsource\uff0c\u518d\u5230operator\u7b97\u5b50\uff0c\u4e2d\u95f4\u662f\u6709\u4e00\u4e2a\u8fc7\u7a0b\u548c\u65f6\u95f4\u7684\uff0c\u867d\u7136\u5927\u90e8\u5206\u60c5\u51b5\u4e0b\uff0c\u6d41\u5230operator\u7b97\u5b50\u7684\u6570\u636e\u90fd\u662f\u6309\u7167\u4e8b\u4ef6\u4ea7\u751f\u7684\u65f6\u95f4\u987a\u5e8f\u6765\u7684\uff0c\u4f46\u662f\u4e5f\u4e0d\u6392\u9664\u7531\u4e8e\u7f51\u7edc\u3001\u5206\u5e03\u5f0f\u7b49\u539f\u56e0\uff0c\u5bfc\u81f4\u4e71\u5e8f\u7684\u4ea7\u751f\u3002<\/p>\n\n\n\n<p>\u56e0\u6b64\u4e00\u65e6\u51fa\u73b0\u4e71\u5e8f\uff0c\u5982\u679c\u53ea\u6839\u636eEvent Time\u6765\u51b3\u5b9awindow\u7684\u8fd0\u884c\uff0c\u4e0d\u80fd\u4fdd\u8bc1\u5728\u7a97\u53e3\u5173\u95ed\u4e4b\u524d\uff0c\u6240\u6709\u7684\u6570\u636e\u90fd\u80fd\u5230\u8fbe\uff0c\u4f46\u6211\u4eec\u53c8\u4e0d\u80fd\u65e0\u9650\u671f\u7684\u7b49\u5f85\u4e0b\u53bb\uff0c\u6b64\u65f6\u6211\u4eec\u9700\u8981\u6709\u4e00\u4e2a\u673a\u5236\u6765\u4fdd\u5b58\u5728\u4e00\u4e2a\u7279\u5b9a\u65f6\u95f4\u540e\uff0c\u5fc5\u987b\u89e6\u53d1\u7a97\u53e3\u8ba1\u7b97\uff0c\u8fd9\u4e00\u4e2a\u673a\u5236\u5c31\u662fwatermark\u3002Watermark\u7279\u70b9\u5982\u4e0b\uff1a<\/p>\n\n\n\n<p>Watermark\u662f\u4e00\u79cd\u8861\u91cfEvent Time\u8fdb\u5c55\u7684\u673a\u5236\u3002<\/p>\n\n\n\n<p>Watermark\u662f\u7528\u4e8e\u5904\u7406\u4e71\u5e8f\u4e8b\u4ef6\u7684, \u5b83\u4e0ewindow\u76f8\u7ed3\u5408\uff0c\u53ef\u4ee5\u6b63\u786e\u5904\u7406\u4e71\u5e8f\u4e8b\u4ef6\u3002<\/p>\n\n\n\n<p>watermark\u662f\u5355\u8c03\u9012\u589e\u7684\u3002watermark = Math.max(eventTime &#8211; dalayTime ,watermark), \u4e00\u65e6watermark\u5927\u4e8e\u7b49\u4e8e\u67d0\u4e2a\u7a97\u53e3\u7684end_time\u65f6\uff0c\u5c31\u4f1a\u89e6\u53d1\u7a97\u53e3\u7684\u8ba1\u7b97\uff0c\u56e0\u6b64Watermark\u5c31\u662f\u7528\u89e6\u53d1\u7a97\u53e3\u8ba1\u7b97\u7684\u3002\u56fe2-3\u662f\u65e0\u5e8f\u6570\u636e\u6d41\u4e2d\u7684watermark\u793a\u4f8b\uff0c\u5b83\u7684\u6700\u5927\u4e71\u5e8f\u65f6\u95f4\u4e3a2\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic4.zhimg.com\/80\/v2-bc4c65590a1f5f24fa594ecdaeecd733_720w.webp\" alt=\"\"\/><figcaption class=\"wp-element-caption\">\u56fe2-3 \u65e0\u5e8f\u6570\u636e\u7684watermark<\/figcaption><\/figure>\n\n\n\n<p>Watermark\u5177\u6709\u4f20\u9012\u6027\u3002\u5982\u679c\u4e00\u4e2a\u7b97\u5b50\u4e0a\u6e38\u6709\u591a\u4e2a\u7b97\u5b50\uff0c\u5219\u8be5\u7b97\u5b50\u7684watermark\u503c\u4e3a\u53d6\u4e0a\u6e38\u6240\u6709\u6d41\u5165\u8be5\u7b97\u5b50\u7684watermark\u7684\u6700\u5c0f\u503c\u3002\u56fe2-4\u4e3awatermark\u7684\u4f20\u9012\u6027\u56fe\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-d9092eb92a753c3beb13d4035403226e_720w.webp\" alt=\"\"\/><figcaption class=\"wp-element-caption\">\u56fe2-4 Watermark\u7684\u4f20\u9012\u6027<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"25_API%E5%B1%82\"><\/span><strong>2.5 API\u5c42<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>API \u901a\u5e38\u5206\u4e3a\u4e09\u5c42\uff0c\u7531\u4e0a\u800c\u4e0b\u53ef\u5206\u4e3aSQL \u3001Table API\u3001DataStream API\u3001ProcessFunction\u4e09\u5c42\uff0cAPI\u7684\u8868\u8fbe\u80fd\u529b\u53ca\u4e1a\u52a1\u62bd\u8c61\u80fd\u529b\u90fd\u975e\u5e38\u5f3a\u5927\uff0c\u4f46\u8d8a\u63a5\u8fd1SQL\u5c42\uff0c\u8868\u8fbe\u80fd\u529b\u4f1a\u9010\u6b65\u51cf\u5f31\uff0c\u62bd\u8c61\u80fd\u529b\u4f1a\u589e\u5f3a\uff0c\u53cd\u4e4b\uff0cProcessFunction \u5c42API\u7684\u8868\u8fbe\u80fd\u529b\u975e\u5e38\u5f3a\uff0c\u53ef\u4ee5\u8fdb\u884c\u591a\u79cd\u7075\u6d3b\u65b9\u4fbf\u7684\u64cd\u4f5c\uff0c\u4f46\u62bd\u8c61\u80fd\u529b\u4e5f\u76f8\u5bf9\u8d8a\u5c0f\u3002\u56fe2-5\u4e3aFlink API\u7684\u5c42\u7ed3\u6784\u56fe\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic1.zhimg.com\/80\/v2-9ba18f65c42573870d2857592c25f1dc_720w.webp\" alt=\"\"\/><figcaption class=\"wp-element-caption\">\u56fe2-5 Flink API\u5c42\u7ed3\u6784\u56fe<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3Flink%E5%AE%9E%E6%97%B6%E8%AE%A1%E7%AE%97%E5%B8%B8%E8%A7%81%E9%97%AE%E9%A2%98%E5%88%86%E6%9E%90\"><\/span>3.Flink\u5b9e\u65f6\u8ba1\u7b97\u5e38\u89c1\u95ee\u9898\u5206\u6790<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"31_%E6%95%B0%E6%8D%AE%E4%B9%B1%E5%BA%8F%E9%97%AE%E9%A2%98%E5%88%86%E6%9E%90\"><\/span><strong>3.1 \u6570\u636e\u4e71\u5e8f\u95ee\u9898\u5206\u6790<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u6570\u636e\u4e71\u5e8f\u662f\u6307Flink\u5728\u4f7f\u7528Event Time\u5904\u7406\u6d41\u5f0f\u6570\u636e\u65f6\uff0c\u7531\u4e8e\u5206\u5e03\u5f0f\u6216\u7f51\u7edc\u539f\u56e0\uff0c\u5bfc\u81f4\u6570\u636e\u5230\u8fbe\u5904\u7406\u673a\u5236\u8fdb\u884c\u5904\u7406\u65f6\u5e76\u4e0d\u662f\u6309\u7167\u6570\u636e\u4ea7\u751f\u7684\u65f6\u95f4\u5148\u540e\u987a\u5e8f\u5230\u8fbe\u7684\u3002\u5bfc\u81f4\u6570\u636e\u4e71\u5e8f\u7684\u573a\u666f\u5982\u4e0b\uff1a<\/p>\n\n\n\n<p>1\u3001kafka\u591a\u5206\u533a\u5bfc\u81f4\u6570\u636e\u4e71\u5e8f<\/p>\n\n\n\n<p>\u56fe3-1\u4e2d\u7684\u6570\u5b57\u8868\u793a\u6570\u636e\u4ea7\u751f\u7684\u65f6\u95f4\u987a\u5e8f\uff0c\u6570\u636e\u751f\u4ea7\u7aef\u6309\u6570\u636e\u4ea7\u751f\u65f6\u95f4\u5c06\u6570\u636e\u63a8\u9001\u5230kafka\uff0c\u56e0\u7531kafka\u5b58\u5728\u591a\u4e2a\u5206\u533a\uff0c\u5728kafka\u7684\u9ed8\u8ba4\u5206\u53d1\u673a\u5236\u4e0b\uff0c\u6570\u636e\u5230\u6d41\u52a8\u5982\u56fe3-1\u6240\u793a\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic1.zhimg.com\/80\/v2-2150b3172d1f7b660d0e89d21614d5a8_720w.webp\" alt=\"\"\/><figcaption class=\"wp-element-caption\">\u56fe3-1 Kafka\u591a\u5206\u533a\u4e71\u5e8f\u56fe<\/figcaption><\/figure>\n\n\n\n<p>\u56fe3-1\u6240\u793a\uff0c\u5047\u5982Flink\u7684source\u7684\u5e76\u884c\u5ea6\u4e0ekafka\u7684\u5206\u533a\u4e00\u81f4\uff0c\u6570\u636e\u7ecf\u8fc7Flink\u7684source\u540e\uff0c\u518d\u7ecf\u8fc7keyby\u5206\u533a\u5f00\u7a97\u540e\uff0c\u6570\u636e\u5c31\u4f1a\u5b58\u5728\u4e71\u5e8f\u60c5\u51b5\uff0c\u4f8b\u5982key\u4e3a0\u7684\u5206\u533a\u7b97\u5b50\uff0c\u7a97\u53e3\u63a5\u53d7\u5230\u7684\u6570\u636e\u987a\u5e8f\u662f\uff1a1,11,26,2\u3002<\/p>\n\n\n\n<p>2\u3001\u7531\u4e8e\u7f51\u7edc\u5ef6\u8fdf\u5bfc\u81f4\u6570\u636e\u4e71\u5e8f<\/p>\n\n\n\n<p>\u5f53\u5b58\u5728\u591a\u4e2a\u6570\u636e\u751f\u4ea7\u7aef\u65f6\uff0c\u6bcf\u4e00\u4e2a\u751f\u4ea7\u7aef\u90fd\u5c06\u4ea7\u751f\u7684\u6570\u636e\uff0c\u901a\u8fc7\u7f51\u7edc\u4f20\u8f93\u5c06\u6570\u636e\u53d1\u9001\u5230kafka\uff0c\u8fd9\u91cc\u4e3a\u4e86\u8bf4\u660e\u7f51\u7edc\u5ef6\u8fdf\uff0c\u5c06kafka\u7684\u5206\u533a\u8bbe\u7f6e\u4e3a1\u3002\u7531\u4e8e\u6bcf\u4e00\u4e2a\u751f\u4ea7\u7aef\u5230kafka\u7aef\u8d70\u7684\u7f51\u7edc\u8def\u5f84\u7684\u4e0d\u540c\uff0c\u53ef\u80fd\u5b58\u5728\u6709\u4e00\u4e9b\u5b58\u5728\u94fe\u8def\u963b\u585e\uff0c\u957f\u77ed\u7b49\u60c5\u51b5\uff0c\u4ece\u800c\u5bfc\u81f4\u6570\u636e\u5230kafak\u7684\u65f6\u95f4\u5e76\u4e0d\u662f\u6309\u7167\u6570\u636e\u4ea7\u751f\u7684\u65f6\u95f4\u987a\u5e8f\u5230\u8fbe\u7684\u3002\u56fe3-2\u4e3a\u7f51\u7edc\u539f\u56e0\u5bfc\u81f4\u6570\u636e\u4e71\u5e8f\u7684\u793a\u610f\u56fe\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic1.zhimg.com\/80\/v2-25ccdc899621d8394d7dfaf345c7e72c_720w.webp\" alt=\"\"\/><figcaption class=\"wp-element-caption\">\u56fe3-2 \u7f51\u7edc\u5ef6\u8fdf\u5bfc\u81f4\u6570\u636e\u4e71\u5e8f\u56fe<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"32_Flink%E5%A4%A7%E7%8A%B6%E6%80%81%E5%9C%BA%E6%99%AF%E5%8F%8A%E9%97%AE%E9%A2%98%E5%88%86%E6%9E%90\"><\/span><strong>3.2 Flink\u5927\u72b6\u6001\u573a\u666f\u53ca\u95ee\u9898\u5206\u6790<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Flink\u5927\u72b6\u6001\u5f62\u6210\u7684\u4e3b\u662f\u56e0\u4e3aflink\u5728\u8ba1\u7b97\u8fc7\u7a0b\u4e2d\uff0c\u5b58\u5728\u5927\u91cf\u7684\u8ba1\u7b97\u4e2d\u95f4\u7ed3\u679c\u3002\u90a3\u4e48\u5728\u90a3\u4e9b\u573a\u666f\u4e0b\u4f1a\u4f7fFlink\u7684\u72b6\u6001\u6bd4\u8f83\u5927\uff0c\u76ee\u524d\u5728\u6211\u4eec\u5b9e\u8df5\u4e2d\u4e3b\u8981\u6709\u4e0b\u9762\u51e0\u79cd\u573a\u666f\uff1a<\/p>\n\n\n\n<p>1\u3001\u6570\u636e\u91cf\u5927\u4e14\u5f00\u7a97\u7684\u65f6\u95f4\u6bd4\u8f83\u957f\uff0c\u4f8b\u5982\u5f001\u5929\uff0c1\u5468\u751a\u81f31\u4e2a\u6708\u7684\u7a97\u53e3\u3002\u8fd9\u79cd\u5f00\u7a97\u65f6\u95f4\u6bd4\u8f83\u957f\uff0c\u8981\u7f13\u5b58\u7684\u6570\u636e\u5c31\u6bd4\u8f83\u5927\uff0c\u56e0\u6b64\u72b6\u6001\u4e5f\u4f1a\u6bd4\u8f83\u5927\u3002\u4f8b\u5982\u6309\u5929\u7edf\u8ba1UV\u6570\u636e\u3002<\/p>\n\n\n\n<p>2\u3001\u6570\u636e\u91cf\u6bd4\u8f83\u5927\u7684\u4e8c\u6761\u6d41join\u65f6\u76f8\u4e92\u7b49\u5f85\u7684\u65f6\u95f4\u6bd4\u8f83\u957f\uff0c\u4f8b\u5982\u8ba2\u5355\u6570\u636e\u4e0e\u7269\u6d41\u7684\u914d\u9001\u6570\u636e\u505ajoin\u5f97\u5230\u8ba2\u5355\u7684\u7269\u6d41\u72b6\u6001\uff0c\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u8ba2\u5355\u6570\u636e\u53ef\u80fd\u8981\u7b49\u5f85\u7269\u6d41\u914d\u9001\u6570\u636e\u6700\u5927\u65f6\u95f4\u89811\u5929\u5de6\u53f3\u3002\u8fd9\u4e5f\u4f1a\u5bfc\u81f4\u4e8c\u6761\u6d41\u7684\u72b6\u6001\u6bd4\u8f83\u5927\u3002<\/p>\n\n\n\n<p>3\u3001Group By\u5206\u7ec4\u7684key\u7684\u6570\u636e\u91cf\u5927\uff0c\u8ba1\u7b97\u7684\u6307\u6807\u9879\u975e\u5e38\u591a\u6216\u8ba1\u7b97\u7684\u6b65\u9aa4\u591a\u590d\u6742\u5ea6\u9ad8\uff0c\u8fd9\u79cd\u60c5\u51b5\u4f1a\u5bfc\u81f4\u8981\u4fdd\u5b58\u5927\u91cf\u7684\u4e2d\u95f4\u8ba1\u7b97\u7ed3\u679c\uff0c\u4ece\u800c\u5bfc\u81f4\u72b6\u6001\u6bd4\u8f83\u5927\u3002<\/p>\n\n\n\n<p>\u56fe3-3\u662f\u4e00\u4e2a\u540e\u7aef\u66dd\u5149\u6d41\u4e0e\u524d\u7aef\u7528\u6237\u70b9\u51fb\u6d41join\u573a\u666f\u4e0bcheckpoint\u4fe1\u606f\u56fe\uff0c\u5728\u4e8c\u6761\u6d41\u7684\u6570\u636e\u76f8\u4e92\u7b49\u5f8530\u5206\u949f\u7684\u60c5\u51b5\u4e0b\uff0ccheckpoint\u5c31\u5df2\u7ecf\u6bd4\u8f83\u5927\u4e86\uff0c\u5982\u679c\u7b49\u5f85\u65f6\u95f4\u66f4\u957f\uff0c\u72b6\u6001\u4f1a\u66f4\u5927\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-bad035606b932962e757371bc070e016_720w.webp\" alt=\"\"\/><figcaption class=\"wp-element-caption\">\u56fe3-3 Flink checkpoint\u56fe<\/figcaption><\/figure>\n\n\n\n<p>\u5728\u72b6\u6001\u6bd4\u8f83\u5927\u7684\u573a\u666f\u4e0b\uff0c\u53ef\u80fd\u5b58\u5728\u4ee5\u4e0b\u95ee\u9898\uff1a<\/p>\n\n\n\n<p>1\u3001Flink\u7684\u5806\u5916\u5185\u5b58\u8d85\u989d\u4f7f\u7528\uff0c\u5bfc\u81f4Yarn\u5c06Task Manager(\u4ee5\u4e0b\u7b80\u79f0TM)\u7684\u5bb9\u5668kill\u6389\uff0c\u5bfc\u81f4\u4efb\u52a1Failover\u3002\u8fd9\u79cd\u60c5\u51b5\u4e3b\u8981\u662fFlink\u5bf9RocksDB\u7684\u4f7f\u7528\u5185\u5b58\u6ca1\u6709\u9650\u5236\uff0c\u5f53\u72b6\u6001\u8d8a\u6765\u8d8a\u5927\u7684\u65f6\uff0c\u5806\u5916\u5185\u5b58\u4f7f\u7528\u91cf\u5c31\u4f1a\u8d85\u989d\u4f7f\u7528\uff0c\u4e00\u65e6TM\u7684\u5185\u5b58\u8d85\u8fc7Yarn\u5206\u914d\u7ed9TM\u6240\u5728\u5bb9\u5668\u7684\u5185\u5b58\uff0c\u5c31\u4f1a\u5bfc\u81f4Yarn\u5c06\u5bb9\u5668kill\u6389\u3002\u8fd9\u79cd\u60c5\u51b5\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7Yarn\u7684\u65e5\u5fd7\u5206\u6790\u5f97\u5230\u539f\u56e0\u3002<\/p>\n\n\n\n<p>2\u3001Checkpoint\u72b6\u6001\u5927\uff0cCheckpoint\u65f6\u95f4\u957f\u3002\u8fd9\u79cd\u60c5\u51b5\uff0c\u6211\u4eec\u53ef\u4ee5\u9996\u5148\u4eceSub Task checkpoint\u4fe1\u606f\u5165\u624b\u3002\u5982\u56fe3-4\u6240\u793a\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic1.zhimg.com\/80\/v2-3ded10a5fbc2dd0415f0c21fd6027a58_720w.webp\" alt=\"\"\/><figcaption class=\"wp-element-caption\">\u56fe3-4 subTask checkpoint\u8be6\u60c5\u56fe<\/figcaption><\/figure>\n\n\n\n<p>\u5148\u770bcheckpoint Data Size\u5927\u5c0f\uff0c\u5982\u679c\u72b6\u6001\u5f88\u5927\uff0c\u518d\u770bEnd to End Duration\u65f6\u95f4\uff0c\u5982\u679c\u65f6\u95f4\u6bd4\u8f83\u5927\uff0c\u6bd4\u5982\u505a\u4e00\u6b21checkpoint\u8981\u82b1\u5341\u51e0\u751a\u81f3\u51e0\u5341\u5206\u949f\u7684\u8bdd\uff0c\u6211\u4eec\u63a5\u7740\u518d\u770b\u5177\u4f53\u7684sub Task checkpoint\u7684\u65f6\u95f4\u8017\u65f6\u60c5\u51b5\u3002<\/p>\n\n\n\n<p>1\u3001Checkpoint\u65f6sub Task\u7684Latest Acknowledgement\u7684\u72b6\u6001\u4e00\u76f4\u4e3an\/a<\/p>\n\n\n\n<p>\u8fd9\u79cd\u60c5\u51b5\u4e0b\u8981\u53bb\u5206\u6790\u662f\u4efb\u52a1\u662f\u5426\u5b58\u5728\u80cc\u538b\u7684\u60c5\u51b5\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7Flink Web UI\u67e5\u770b\u7b97\u5b50merics\u7684inPoolUsage\u548coutPoolUsage\u7684\u4f7f\u7528\u7387\u3002\u5982\u679coutPoolUsage\u7684\u4f7f\u7528\u4f4e\u800cinPoolUsage\u4f7f\u7528\u7387\u9ad8\uff0c\u8bf4\u660e\u80cc\u538b\u662f\u7531\u8be5\u7b97\u5b50\u4ea7\u751f\u7684\u3002\u5982\u679cinPoolUsage\u4f7f\u7528\u7387\u4f4e\uff0c\u800coutPoolUsage\u4f7f\u7528\u7387\u5f88\u9ad8\u5219\u8bf4\u660e\u662f\u4e0b\u6e38\u7b97\u5b50\u8ba1\u7b97\u5904\u7406\u4e0d\u53ca\u65f6\u5bfc\u81f4\u4e0a\u6e38\u7b97\u5b50\u80cc\u538b\u3002\u7ee7\u7eed\u6309\u4e0a\u9762\u7684\u65b9\u6cd5\u6392\u67e5\uff0c\u6700\u7ec8\u627e\u5230\u4ea7\u751f\u80cc\u538b\u7684\u7b97\u5b50<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-4e2ce94eb41b414a83417bf0bb606472_720w.webp\" alt=\"\"\/><figcaption class=\"wp-element-caption\">\u56fe3-5 \u7b97\u5b50\u8f93\u5165\u8f93\u51fa\u7f13\u51b2\u533a\u4f7f\u7528\u7387\u56fe<\/figcaption><\/figure>\n\n\n\n<p>2\u3001\u5173\u6ce8Sync Duration\u548cAsync Duration\u65f6\u95f4<\/p>\n\n\n\n<p>Sync Duration\u65f6\u95f4\u5f88\u957f\uff0c\u8bf4\u660e\u78c1\u76d8IO\u53ef\u80fd\u6210\u4e3a\u6027\u80fd\u74f6\u9888<\/p>\n\n\n\n<p>Async Duration\u65f6\u95f4\u5f88\u957f\uff0c\u8bf4\u660e\u662f\u7f51\u7edcIO\u53ef\u80fd\u6210\u4e3a\u6027\u80fd\u74f6\u9888\u6216\u662f\u6570\u636e\u540c\u6b65\u7ebf\u7a0b\u592a\u5c11<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"33_%E6%95%B0%E6%8D%AE%E5%80%BE%E6%96%9C%E9%97%AE%E9%A2%98\"><\/span><strong>3.3 \u6570\u636e\u503e\u659c\u95ee\u9898<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u6570\u636e\u503e\u659c\u7531\u4e8e\u6570\u636e\u5206\u5e03\u4e0d\u5747\u5300\uff0c\u9020\u6210\u6570\u636e\u5927\u91cf\u7684\u96c6\u4e2d\u5230\u4e00\u70b9\uff0c\u9020\u6210\u6570\u636e\u70ed\u70b9\u3002\u5728\u8fd9\u79cdFlink\u5b9e\u65f6\u8ba1\u7b97\u573a\u666f\u4e2d\uff0c\u6211\u4eec\u4f1a\u53d1\u73b0\u5728\u67d0\u4e2a\u7b97\u5b50\u7684\u5904\u7406\u4e0a\uff0c\u4e00\u4e9bsub task\u5904\u7406\u7684\u6570\u636e\u91cf\u5f88\u5927\uff0c\u6709\u4e00\u4e9bsub task\u5904\u7406\u7684\u6570\u636e\u91cf\u5f88\u5c0f\uff0c\u4eceflink\u7684\u96c6\u7fa4\u754c\u9762\u4e0a\uff0c\u6211\u4eec\u4e5f\u53ef\u4ee5\u770b\u5230\u7b97\u5b50\u7684\u80cc\u538b\u60c5\u51b5\uff0c\u5728\u8fd9\u79cd\u573a\u666f\u4e0b\uff0c\u6211\u4eec\u901a\u8fc7\u589e\u52a0\u7b97\u5b50\u7684\u5e76\u884c\u5ea6\uff0c\u5e76\u4e0d\u80fd\u6539\u5584\u7b97\u5b50\u7684\u80cc\u538b\u60c5\u51b5\u3002\u4f8b\u5982PV\u7684\u573a\u666f\u4e2d\uff0c\u6709\u4e00\u4e9b\u7f51\u9875\u7684\u70b9\u51fb\u91cf\u5f88\u9ad8\uff0c\u800c\u6709\u4e00\u4e9b\u7f51\u9875\u7684\u70b9\u91cf\u5f88\u5c11\uff0c\u4ece\u800c\u5bfc\u81f4\u67d0\u4e9bsub task\u80cc\u538b\u4e25\u91cd\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-ab57f438317d0575282af8d6d98468da_720w.webp\" alt=\"\"\/><figcaption class=\"wp-element-caption\">\u56fe3-6 \u6570\u636e\u503e\u659c\u793a\u610f\u56fe<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4%E5%AE%9E%E6%97%B6%E8%AE%A1%E7%AE%97%E5%B8%B8%E8%A7%81%E9%97%AE%E9%A2%98%E7%9A%84%E8%A7%A3%E5%86%B3%E6%96%B9%E6%A1%88\"><\/span>4.\u5b9e\u65f6\u8ba1\u7b97\u5e38\u89c1\u95ee\u9898\u7684\u89e3\u51b3\u65b9\u6848<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"41_%E6%95%B0%E6%8D%AE%E4%B9%B1%E5%BA%8F%E5%9C%BA%E6%99%AF%E7%9A%84%E5%A4%84%E7%90%86\"><\/span><strong>4.1 \u6570\u636e\u4e71\u5e8f\u573a\u666f\u7684\u5904\u7406<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Flink\u5904\u7406\u6570\u636e\u4e71\u5e8f\u7684\u65b9\u5f0f\u6709\u4e09\u79cd\uff1a<\/p>\n\n\n\n<p>1\u3001Watermark<\/p>\n\n\n\n<p>\u6211\u4eec\u5728\u8bbe\u7f6ewatermark\u65f6\uff0c\u53ef\u4ee5\u8bbe\u7f6e\u4e00\u4e2a\u6700\u5927\u7684\u4e71\u5e8f\u65f6\u95f4\uff0c\u800cwatermark\u662f\u4ee5\u4e8b\u4ef6\u65f6\u95f4\u51cf\u53bb\u6240\u5141\u8bb8\u7684\u6700\u5927\u4e71\u5e8f\u65f6\u95f4\u4f5c\u4e3awatermark\uff0c\u56e0\u6b64\u76f8\u5f53\u4e8e\u591a\u7ed9\u4e86\u6570\u636e\u4e00\u5b9a\u7684\u65f6\u95f4\uff0c\u7136\u540e\u5173\u95ed\u7a97\u53e3\uff0c\u89e6\u53d1\u8ba1\u7b97\u3002<\/p>\n\n\n\n<p>2\u3001\u5141\u8bb8\u8fdf\u5230\uff08allowedLateness\uff09<\/p>\n\n\n\n<p>\u5982\u679c\u5728watermark\u7684\u57fa\u7840\u4e0a\u6709\u7684\u6570\u636e\u8fd8\u662f\u53ef\u80fd\u4f1a\u8fdf\u5230\uff0c\u8fd9\u65f6\u6211\u4eec\u53ef\u4ee5\u518d\u591a\u7ed9\u6570\u636e\u4e00\u5b9a\u7684\u53ef\u4ee5\u8fdf\u5230\u7684\u65f6\u95f4\uff0c\u6b64\u65f6\u5f53watermark\u5230\u8fbe\u7a97\u53e3\u5927\u5c0f\u65f6\u89e6\u53d1\u8ba1\u7b97\uff0c\u4f46\u662f\u4e0d\u4f1a\u5173\u95ed\u7a97\u53e3\uff0c\u800c\u662f\u76f4\u5230\u6240\u5141\u8bb8\u7684\u8fdf\u5230\u65f6\u95f4\u540e\uff0c\u624d\u4f1a\u771f\u6b63\u5173\u95ed\u7a97\u53e3\u3002<\/p>\n\n\n\n<p>3\u3001\u4fa7\u8f93\u51fa\u6d41<\/p>\n\n\n\n<p>\u5f53\u6570\u636e\u8fdf\u5230\u7684\u65f6\u95f4\u975e\u5e38\u4e45\uff0c\u524d\u4e24\u79cd\u90fd\u5931\u6548\u65f6\u4f7f\u7528\uff0c\u76f8\u5f53\u4e8e\u8fdf\u5230\u6570\u636e\u5f52\u653e\u5165\u4e00\u4e2a\u5206\u652f\u6d41\u4e2d\u8fdb\u884c\u5355\u72ec\u8ba1\u7b97\u3002<\/p>\n\n\n\n<p><strong>4.1.1 Flink SQL\u5904\u7406\u4e71\u5e8f<\/strong><\/p>\n\n\n\n<p>\u521b\u5efakafka\u52a8\u6001\u8868<\/p>\n\n\n\n<p>\u5728\u521b\u5efaKafka\u52a8\u6001\u8868\u65f6\uff0c\u6211\u4eec\u4f7f\u7528watermark for orderTime as orderTime \u2013 interval \u20182\u2019MINUTE\u8bed\u53e5\u6765\u8bf4\u660e\u63d0\u53d6\u7684watermark\u4e3a\u8ba2\u5355\u65f6\u95f4\u51cf2\u5206\u949f\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic4.zhimg.com\/80\/v2-6d854e49b9c4b09f5f2e6537585b2c3b_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p>\u5f00\u7a97\u805a\u5408\u8ba1\u7b97<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic4.zhimg.com\/80\/v2-642258e7de9d327bf83799d89b6ff6fb_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p>\u5982\u679c\u60f3\u6bcf10\u79d2\u8f93\u51fa\u4e00\u6b21\u8ba1\u7b97\u7ed3\u679c\uff0c\u53ef\u4ee5\u8bbe\u7f6e\u4e0b\u9762\u53c2\u6570\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic2.zhimg.com\/80\/v2-fd040a21623953481a1aa75399a1c3c5_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p>\u5728SQL\u5c42\u9762\uff0c\u76ee\u524d\u53ea\u652f\u6301\u4f7f\u7528watermark\u6765\u5904\u7406\u6570\u636e\u4e71\u5e8f\u95ee\u9898\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"421_DataStream_API%E5%A4%84%E7%90%86%E4%B9%B1%E5%BA%8F\"><\/span><strong>4.2.1 DataStream API\u5904\u7406\u4e71\u5e8f<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic4.zhimg.com\/80\/v2-9fb9e99f667102f0728a675cb9221713_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p>\u4ece\u4e0a\u9762\u4ee3\u7801\u53ef\u4ee5\u770b\u51fa\uff0c\u6211\u4eec\u4f7f\u7528\u65f6\u95f4\u5206\u914d\u5668\u65f6\uff0c\u4f7f\u7528WatermarkStrateg\u3002 forBoundedOutOfOrderness(Duration.ofMillis(jobPrarameter.getOutOfBoundMs()))\u65b9\u6cd5\u6765\u8bbe\u7f6e\u6570\u636e\u7684\u6700\u5927\u4e71\u5e8f\u65f6\u95f4\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic1.zhimg.com\/80\/v2-4d0cbbee26e372c89bf6685fc46adba0_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic1.zhimg.com\/80\/v2-c9636ab3b570e99b95b475c885b0005c_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p>\u5728\u5f00\u7a97\u53e3\u540e\uff0c\u6211\u4eec\u53c8\u4f7f\u7528DataStream\u7684allowedLatenes(Time.seconds(30))\u6765\u8bbe\u7f6e\u7a97\u53e3\u5ef6\u8fdf\u5173\u95ed\u65f6\u95f4\u4e3a30\u79d2\u3002<\/p>\n\n\n\n<p>\u5982\u679c\u6570\u636e\u5728watermark\u5927\u4e8e\u7b49\u4e8e\u7a97\u53e3\u7684\u7ed3\u675f\u65f6\u95f4+\u6700\u5927\u5ef6\u8fdf\u65f6\u95f4\u4e4b\u540e\u624d\u5230\u8fbe\uff0c\u8fd9\u65f6\uff0c\u5982\u679c\u6211\u4eec\u4e0d\u505a\u4efb\u4f55\u5904\u7406\u7684\u8bdd\u7684\u6570\u636e\u5c31\u4f1a\u88ab\u4e22\u5f03\u6389\uff0c\u5982\u679c\u5f53\u6211\u4eec\u4e0d\u60f3\u4e22\u5f03\u6389\u8fd9\u4e9b\u6570\u636e\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u901a\u8fc7\u4fa7\u8f93\u51fa\u6d41\u6765\u89e3\u51b3\u3002\u89e3\u51b3\u6b65\u9aa4\u5982\u4e0b\uff1a<\/p>\n\n\n\n<p>1\u3001\u521b\u5efa\u4fa7\u8f93\u51fa\u7684Tag\u6807\u5fd7\u5bf9\u8c61.<\/p>\n\n\n\n<p>2\u3001\u5728allowedLateness\u4e4b\u540e\uff0c\u8bbe\u7f6e\u5c06\u6570\u636e\u8f93\u51fa\u5230outputTag\u6807\u5fd7\u7684\u4fa7\u8f93\u51fa\u6d41\u3002<\/p>\n\n\n\n<p>3\u3001\u4ece\u7a97\u53e3\u8ba1\u7b97\u540e\u5f97\u5230\u7684\u6d41\u4e2d\u901a\u8fc7getSideOutput(outputTag)\u83b7\u53d6\u8fdf\u5230\u6570\u636e\u7684\u4fa7\u8f93\u51fa\u6d41\u3002<\/p>\n\n\n\n<p>4\u3001\u5f97\u5230\u8fdf\u5230\u6570\u636e\u7684\u4fa7\u8f93\u51fa\u6d41\u540e\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u6839\u636e\u4e1a\u52a1\u9700\u8981\u5bf9\u4fa7\u8f93\u51fa\u6d41\u7684\u6570\u636e\u8fdb\u884c\u76f8\u5e94\u7684\u5904\u7406\u3002\u5728\u4e0b\u9762\u7684\u4ee3\u7801\u4e2d\u6211\u4eec\u5c06\u7a97\u53e3\u805a\u5408\u8ba1\u7b97\u5f97\u5230\u7684\u6d41\u4e0e\u4fa7\u8f93\u51fa\u6d41\u8fdb\u884cconnect\u8fde\u63a5\u540e\uff0c\u5f97\u5230\u4e00\u4e2aConnectedStreams\u5bf9\u8c61\uff0c\u5728ConnectedStreams\u5bf9\u8c61\u4e0a\u4f7f\u7528flatMap\u65b9\u6cd5\u7684CoFlatMapFunction\u5c06\u4fa7\u8f93\u51fa\u6d41\u7684\u6570\u636e\u7d2f\u52a0\u5230\u805a\u5408\u8ba1\u7b97\u7684\u7ed3\u679c\u6d41\u4e0a\u65f6\u8fdb\u884c\u8f93\u51fa\uff0c\u4ece\u800c\u4fdd\u8bc1\u4e86\u805a\u5408\u8ba1\u7b97\u540e\u7684\u6570\u636e\u7684\u51c6\u786e\u6027\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic1.zhimg.com\/80\/v2-2a665aaf402bbcc5000716d023dbb9d8_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p>\u56e0\u6b64\uff0c\u4e0eSQL\u76f8\u6bd4\uff0c\u4f7f\u7528DataStream API\u6211\u4eec\u53ef\u4ee5\u66f4\u52a0\u7075\u6d3b\u7684\u5904\u7406\u6570\u636e\uff0c\u56e0\u6b64\u5728\u5904\u7406\u6570\u636e\u4e71\u5e8f\u65f6\uff0c\u6839\u636e\u9700\u8981\uff0c\u6211\u4eec\u53ef\u4ee5\u540c\u65f6\u4f7f\u7528\u4e09\u79cd\u5904\u7406\u4e71\u5e8f\u7684\u65b9\u6848\u6765\u5904\u7406\u4e71\u5e8f\u6570\u636e\u3002\u800cSQL\u76ee\u524d\u53ea\u652f\u6301\u4f7f\u7528Watermark\u7684\u65b9\u5f0f\u6765\u5904\u7406\u4e71\u5e8f\u6570\u636e\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"42_Flink%E5%A4%A7%E7%8A%B6%E6%80%81%E9%97%AE%E9%A2%98%E8%A7%A3%E5%86%B3%E6%96%B9%E6%A1%88\"><\/span><strong>4.2 Flink\u5927\u72b6\u6001\u95ee\u9898\u89e3\u51b3\u65b9\u6848<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u5728\u4e0a\u9762\u7684Flink\u5927\u72b6\u6001\u573a\u666f\u53ca\u95ee\u9898\u5206\u6790\u7ae0\u8282\uff0c\u6211\u4eec\u53ef\u4ee5\u77e5\u9053\u5927\u72b6\u6001\u4f1a\u5bfc\u81f4\u5982\u4e0b\u95ee\u9898\uff1a<\/p>\n\n\n\n<p>1\u3001\u5185\u5b58\u8d85\u989d\u4f7f\u7528<\/p>\n\n\n\n<p>2\u3001Checkpoint\u65f6\u95f4\u8fc7\u957f<\/p>\n\n\n\n<p>\u4ee5\u4e0a\u95ee\u9898\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u529e\u6cd5\u6765\u89e3\u51b3\uff1a<\/p>\n\n\n\n<p><strong>4.2.1 \u51cf\u5c11\u72b6\u6001\u5927\u5c0f<\/strong><\/p>\n\n\n\n<p>\u5982\u679c\u72b6\u6001\u6bd4\u8f83\u5927\uff0c\u6211\u4eec\u662f\u5426\u53ef\u4ee5\u51cf\u5c11\u72b6\u6001\u5462\uff0c\u7b54\u6848\u662f\u80af\u5b9a\u7684\u3002\u4f8b\u5982\u5f53\u6211\u4eec\u72b6\u6001\u4f7f\u7528\u7684POJO\u7c7b\u5bf9\u8c61\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528ProtoStuff\u6765\u51cf\u5c11\u5bf9\u8c61\u7684\u5b58\u50a8\u7a7a\u95f4\uff0c\u4ece\u800c\u51cf\u5c11\u5bf9\u8c61\u5e8f\u5217\u5316\u540e\u7684\u5b58\u50a8\u7a7a\u95f4\u5927\u5c0f\u3002\u4e0b\u9762\u662f\u4f7f\u7528ProtoStuff\u8fdb\u884c\u5e8f\u5217\u5316\u548c\u53cd\u5e8f\u5217\u5316\u7684\u4ee3\u7801\u793a\u4f8b\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-460e99fc315c1ad607e401b47a6df6a6_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p>\u6ce8\uff1a\u5728\u76ee\u524d\u4f7f\u7528\u7684ProtoStuff\u7684\u7248\u672c\uff0c\u7531\u4e8e\u4e0d\u652f\u6301\u65f6\u95f4\u7c7b\u578b\uff0c\u6240\u4ee5\u5bf9\u65f6\u95f4\u7c7b\u578b\u53ef\u4ee5\u8f6c\u6362\u6210\u5b57\u7b26\u4e32\u6216Long\u7c7b\u578b\u6765\u5b58\u50a8\u3002<\/p>\n\n\n\n<p><strong>4.2.2 \u5185\u5b58\u8d85\u989d\u4f7f\u7528<\/strong><\/p>\n\n\n\n<p>\u5982\u679cTM\u662f\u56e0\u4e3a\u5185\u5b58\u4e0d\u8db3\u88abkill\u6389\uff0c\u89e3\u51b3\u65b9\u6848\u6709\u4e8c\u79cd\uff1a<\/p>\n\n\n\n<p>1\u3001\u60f3\u529e\u6cd5\u51cf\u5c11\u72b6\u6001\u5927\u5c0f(\u5982\u4e0a\u9762\u7684\u7b2c\u4e00\u70b9)\u3002<\/p>\n\n\n\n<p>2\u3001\u589e\u52a0TM\u7684\u5185\u5b58\uff0c\u5982\u539f\u6765TM\u4e3a4G\uff0c\u53ef\u4ee5\u589e\u52a0\u52306G\uff0c\u751a\u81f3\u66f4\u591a\u3002<\/p>\n\n\n\n<p><strong>4.2.3 Checkpoint\u65f6\u95f4\u957f<\/strong><\/p>\n\n\n\n<p>\u4fee\u6539checkpoint\u7b56\u7565<\/p>\n\n\n\n<p>\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0cflink checkpoint \u662f\u5168\u91cf\u5907\u4efd\uff0c\u5f53\u72b6\u6001\u5f88\u5927\uff0c\u5168\u91cf\u5907\u4efd\u4f1a\u5bfc\u81f4\u6bcf\u6b21\u7684checkpoint\u8017\u65f6\u4f1a\u5f88\u957f,\u5f00\u542fcheckpoint\u7684\u589e\u91cf\u914d\u7f6e\uff0c\u5728\u53ef\u4ee5\u663e\u8457\u51cf\u5c11\u6bcf\u6b21checkpoint\u72b6\u6001\u7684\u5927\u5c0f\uff0c\u4ee5\u53cacheckpoint\u7684\u65f6\u95f4\u3002\u4fee\u6539flink-conf.yaml\u4e2d\u7684\u914d\u7f6e\uff0c\u5c06state.backend.incremental\u8bbe\u7f6e\u4e3atrue\u3002<\/p>\n\n\n\n<p>\u7b97\u5b50\u80cc\u538b\u5bfc\u81f4checkpoint\u65f6\u95f4\u8fc7\u957f<\/p>\n\n\n\n<p>\u5982\u679c\u662f\u67d0\u4e2a\u7b97\u5b50\u7684\u80cc\u538b\u539f\u56e0\u5bfc\u81f4checkpoint\u65f6\u95f4\u5f88\u957f\uff0c\u6211\u4eec\u53ef\u4ee5\u53bb\u4f18\u5316\u8be5\u7b97\u5b50\uff0c\u627e\u51fa\u6700\u8017\u65f6\u7684\u64cd\u4f5c\u8fdb\u884c\u4f18\u5316\u3002\u4e0b\u9762\u662f\u6211\u9047\u5230\u4e00\u4e9b\u573a\u666f\u7684\u4f18\u5316\u65b9\u6848\uff1a<\/p>\n\n\n\n<p>1\u3001\u4e0e\u7ef4\u5ea6\u8868join\u3002\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u4e00\u662f\u52a0\u7f13\u5b58\u5e76\u8bbe\u7f6e\u6570\u636e\u8fc7\u671f\u65f6\u95f4\u3002\u4e8c\u662f\u4f7f\u7528Redis\u6765\u5b58\u653e\u7ef4\u5ea6\u8868\u7684\u6570\u636e\u3002<\/p>\n\n\n\n<p>2\u3001\u6570\u636e\u503e\u659c\u3002\u8fd9\u4e00\u5757\u6211\u4eec\u5c06\u5728\u6570\u636e\u503e\u659c\u4e00\u8282\u4e13\u95e8\u6765\u8bb2\uff0c\u8fd9\u91cc\u5c31\u4e0d\u518d\u8bf4\u4e86\u3002<\/p>\n\n\n\n<p>\u7b97\u5b50\u7684\u8ba1\u7b97\u903b\u8f91\u590d\u6742\u3002\u5c06\u8ba1\u7b97\u8fc7\u7a0b\u62c6\u5206\u5230\u591a\u4e2a\u7b97\u5b50\u4e2d\u6267\u884c\uff0c\u800c\u4e0d\u662f\u5728\u4e00\u4e2a\u7b97\u5b50\u4e2d\u5b8c\u6210\u6240\u6709\u7684\u903b\u8f91\u8ba1\u7b97\u3002<\/p>\n\n\n\n<p>\u78c1\u76d8IO\u5bfc\u81f4checkpoint\u65f6\u95f4\u8fc7\u957f<\/p>\n\n\n\n<p>\u5982\u679c\u662f\u56e0\u4e3a\u78c1\u76d8IO\u95ee\u9898\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u6848\u6765\u89e3\u51b3\uff1a<\/p>\n\n\n\n<p>1\u3001\u68c0\u67e5\u78c1\u76d8\u662f\u5426\u4e3aSSD\u78c1\u76d8, \u5982\u679c\u4e0d\u662f\uff0c\u5219\u5efa\u8bae\u4f7f\u7528SSD\u78c1\u76d8\u3002<\/p>\n\n\n\n<p>2\u3001\u6302\u8f7d\u591a\u5757\u78c1\u76d8\uff0c\u5728flink-conf.yaml\u4e2d\u901a\u8fc7\u914d\u7f6estate.backend.rocksdb.localdir\u6765\u6307\u5b9a\u591a\u4e2a\u6302\u8f7d\u76ee\u5f55\u3002\u4e0d\u540c\u7684\u76ee\u5f55\u6302\u8f7d\u5230\u4e0d\u540c\u7684\u78c1\u76d8\u3002<\/p>\n\n\n\n<p>3\u3001\u901a\u8fc7\u4e0a\u9762\u7684\u64cd\u4f5c\u540e\uff0c\u8fd8\u662f\u5b58\u5728IO\u95ee\u9898\uff0c\u6bd4\u5982\u6709\u7684\u78c1\u76d8IO\u4f7f\u7528\u9ad8\uff0c\u6709\u7684\u4f7f\u7528\u4f4e\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u53ef\u80fd\u662f\u7531\u4e8e\u591a\u4e2asub task\u5171\u7528\u540c\u4e00\u5757\u78c1\u76d8\u7684\u95ee\u9898\uff0c\u5bfc\u81f4\u8d1f\u8f7d\u4e0d\u5747\u8861\u3002\u89e3\u51b3\u8fd9\u4e00\u4e2a\u95ee\u9898\uff0c\u901a\u5e38\u7684\u7b56\u7565\u5c31\u662f\u8d1f\u8f7d\u5747\u8861\u7b56\u7565\u3002\u901a\u7528\u7684\u8d1f\u8f7d\u5747\u8861\u7b56\u7565\u6709hash, \u968f\u673a\u4ee5\u53ca\u8f6e\u5faa\u7b49\u7b56\u7565\u3002Flink\u9ed8\u8ba4\u4f7f\u7528\u7684\u7b56\u7565\u662f\u968f\u673a\u7b56\u7565\uff0c\u6e90\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-458965b3b8205a3c2ed4057a499c3ef6_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p>\u5982\u679c\u60f3\u4f7f\u7528\u5176\u4ed6\u7b56\u7565\uff0c\u53ef\u4ee5\u4fee\u6539\u8fd9\u91cc\u7684\u6e90\u7801\u3002<\/p>\n\n\n\n<p>\u6570\u636e\u4f20\u8f93\u5bfc\u81f4checkpoint\u65f6\u95f4\u8fc7\u957f<\/p>\n\n\n\n<p>Async Duration\u662f\u6307RocksDB\u5c06\u672c\u5730checkpoint\u7684\u72b6\u6001\u5907\u4efd\u5230\u5176\u4ed6\u6301\u4e45\u5316\u5b58\u50a8\u7cfb\u7edf\u6240\u82b1\u8d39\u7684\u65f6\u95f4\uff0c\u5176\u4ed6\u5b58\u50a8\u7cfb\u7edf\u5982HDFS\u6587\u4ef6\u7cfb\u7edf\u3002\u5982\u679c\u662f\u7531\u4e8eAsync Duration\u65f6\u95f4\u957f\uff0c\u5148\u68c0\u67e5\u7f51\u7edcIO\u4f7f\u7528\u662f\u5426\u5f88\u9ad8\uff0c\u5982\u679c\u4e0d\u662f\u5f88\u9ad8\uff0c\u8bf4\u660eRocksDB\u5c06\u672c\u5730\u72b6\u6001\u6570\u636e\u4e0a\u4f20\u5230HDFS\u65f6\u82b1\u8d39\u7684\u65f6\u95f4\u592a\u591a\uff0c\u8fd9\u65f6\u6211\u4eec\u53ef\u4ee5\u63d0\u9ad8RocksDB\u7684\u6570\u636e\u4f20\u8f93\u7ebf\u7a0b\u6570\u91cf\uff0c\u56e0\u4e3aRocksDB\u9ed8\u8ba4\u7684\u6570\u636e\u4f20\u8f93\u7ebf\u7a0b\u6570\u91cf\u4e3a1\uff0c\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u589e\u52a0\u7ebf\u7a0b\u6570\u91cf\u6765\u51cf\u5c11Async Duration\u7684\u65f6\u95f4\u3002\u589e\u52a0\u6570\u636e\u4f20\u8f93\u7ebf\u7a0b\u6570\u91cf\u7684\u4ee3\u7801\u8bbe\u7f6e\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic2.zhimg.com\/80\/v2-c3e24eebaaa75347fa10cba5706b3c39_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"43_%E6%95%B0%E6%8D%AE%E5%80%BE%E6%96%9C%E9%97%AE%E9%A2%98%E8%A7%A3%E5%86%B3%E6%96%B9%E6%A1%88\"><\/span><strong>4.3 \u6570\u636e\u503e\u659c\u95ee\u9898\u89e3\u51b3\u65b9\u6848<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p><strong>4.3.1 Local-Global Aggregation\u7b56\u7565<\/strong><\/p>\n\n\n\n<p>Flink\u5bf9\u4e8e\u6570\u636e\u503e\u659c\u7684\u89e3\u51b3\u65b9\u6848\u662f\u91c7\u7528Local-Global Aggregation\u7b56\u7565\u3002Local-Global\u5c06\u4e00\u4e2a\u7ec4\u805a\u5408\u5206\u4e3a\u4e24\u4e2a\u9636\u6bb5\uff0c\u5373\u9996\u5148\u5728\u4e0a\u6e38\u8fdb\u884c\u5c40\u90e8\u805a\u5408\uff0c\u7136\u540e\u5728\u4e0b\u6e38\u8fdb\u884c\u5168\u5c40\u805a\u5408\u3002\u5b83\u7c7b\u4f3c\u4e8eMapReduce\u7684Combine + Reduce\u6a21\u5f0f\u3002\u5b83\u7684\u539f\u7406\u5982\u4e0b\u56fe4-1\u6240\u793a\u3002\u56fe4-1 Local-Global Aggregation\u4f18\u5316\u793a\u610f\u56fe<\/p>\n\n\n\n<p>Flink sql\u4f7f\u7528Local-Global Aggregation\u7b56\u7565\u975e\u5e38\u7b80\u5355\uff0c\u53ea\u8981\u8bbe\u7f6e\u5982\u4e0b\u914d\u7f6e\u5373\u53ef\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-eb44e262e8dcda3a869c8af27e967e72_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><strong>4.3.2 Split-Distinct Aggregation<\/strong><\/p>\n\n\n\n<p>Local-Global \u4f18\u5316\u53ef\u6709\u6548\u6d88\u9664\u4e00\u822c\u805a\u5408\u7684\u6570\u636e\u503e\u659c\uff0c\u4f8b\u5982 SUM\u3001COUNT\u3001MAX\u3001MIN\u3001AVG\u3002\u4f46\u662f\u5728\u5904\u7406distinct \u7684\u805a\u5408\u65f6\uff0c\u5b83\u7684\u6027\u80fd\u5e76\u4e0d\u4ee4\u4eba\u6ee1\u610f\u3002\u4f8b\u5982\u4e0b\u9762\u7684SQL:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic4.zhimg.com\/80\/v2-f09bba40cfafe7ca986fd78af782700f_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p>\u5982\u679c\u4e0d\u540c\u952e\uff08\u5373user_id\uff09\u7684\u503c\u7a00\u758f\uff0c\u5219 COUNT DISTINCT\u4e0d\u64c5\u957f\u51cf\u5c11\u8bb0\u5f55\u3002\u5373\u4f7f\u542f\u7528\u4e86Local-Global\u4f18\u5316\uff0c\u4e5f\u65e0\u6d4e\u4e8e\u4e8b\u3002\u56e0\u4e3a\u7d2f\u52a0\u5668\u4ecd\u7136\u5305\u542b\u51e0\u4e4e\u6240\u6709\u7684\u539f\u59cb\u8bb0\u5f55\uff0c\u5168\u5c40\u805a\u5408\u5c06\u6210\u4e3a\u74f6\u9888\u3002\u5982\u4e0b\u56fe4-2\u5de6\u4fa7\u6240\u793a\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic4.zhimg.com\/80\/v2-38e5f4473e633943116058c4aa63481b_720w.webp\" alt=\"\"\/><figcaption class=\"wp-element-caption\">\u56fe4-2 Split-Distinct Aggregation\u4f18\u5316\u793a\u610f\u56fe<\/figcaption><\/figure>\n\n\n\n<p>Split-Distinct Aggregation\u4f18\u5316\u7684\u60f3\u6cd5\u662f\u5c06\u4e0d\u540c\u7684\u805a\u5408\uff08\u4f8b\u5982COUNT(DISTINCT col)\uff09\u5206\u6210\u4e24\u4e2a\u7ea7\u522b\u3002<\/p>\n\n\n\n<p>\u7b2c\u4e00\u6b65\u662f\u6309\u7167day\u548cbucket\u952e\u503c\u8fdb\u884c\u5206\u7ec4\u805a\u5408\u3002bucket\u952e\u503c\u7b49\u4e8eHASH_CODE(user_id) % BUCKET_NUM\u3002BUCKET_NUM\u9ed8\u8ba41024\uff0c\u53ef\u901a\u8fc7table.optimizer.distinct-agg.split.bucket-num\u9009\u9879\u914d\u7f6e\u3002<\/p>\n\n\n\n<p>\u7b2c\u4e8c\u6b65\u6309\u539f\u59cb\u952e(\u5373day)\u5206\u7ec4\uff0cSUM\u7528\u4e8e\u805a\u5408\u6765\u81ea\u4e0d\u540c\u5b58\u50a8\u6876\u7684 COUNT DISTINCT \u503c\u3002\u56e0\u4e3a\u76f8\u540c\u7684distinct key\u53ea\u4f1a\u5728\u540c\u4e00\u4e2abucket\u4e2d\u8ba1\u7b97\uff0c\u6240\u4ee5\u53d8\u6362\u662f\u7b49\u4ef7\u7684\u3002<\/p>\n\n\n\n<p>\u4e0a\u9762\u7684sql\u901a\u8fc7split-distinct aggregation\u4f18\u5316\u540e\uff0cSQL\u76f8\u5f53\u4e8e\u4e0b\u9762\u7684SQL\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic2.zhimg.com\/80\/v2-28d077fdde124eb7ddf616ce83fa0209_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p>Flink SQL\u8981\u5f00\u542fsplit-distinct aggregation\u4f18\u5316\uff0c\u53ea\u9700\u8981\u8bbe\u7f6e\u4e0b\u9762\u7684\u914d\u7f6e\u5373\u53ef\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic4.zhimg.com\/80\/v2-10d608eda21f207e038fd87dd66d48ab_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5%E6%80%BB%E7%BB%93\"><\/span>5.\u603b\u7ed3<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u672c\u6587\u6df1\u5165\u5206\u6790\u4e86Flink\u5b9e\u65f6\u8ba1\u7b97\u5e94\u7528\u5b9e\u8df5\u4e2d\u7684\u5e38\u89c1\u95ee\u9898\uff1a\u6570\u636e\u4e71\u5e8f\uff0c\u5927\u72b6\u6001\u4f5c\u4e1a\u4f18\u5316\uff0c\u6570\u636e\u503e\u659c\uff0c\u5e76\u4e14\u5bf9\u76f8\u5e94\u95ee\u9898\u63d0\u51fa\u4e86\u53ef\u884c\u7684\u89e3\u51b3\u65b9\u6848\u3002\u540e\u7eed\u6211\u4eec\u5c06\u63a2\u8ba8Flink\u5728\u667a\u80fd\u98ce\u63a7\uff0c\u5b9e\u65f6\u6570\u636e\u5165\u6e56\uff0c\u5b9e\u65f6\u76d1\u63a7\u7b49\u5176\u5b83\u4e1a\u52a1\u573a\u666f\u7684\u5e94\u7528\u5b9e\u8df5\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>1.\u7b80\u4ecb \u968f\u7740\u5174\u76db\u4f18\u9009\u4e1a\u52a1\u7684\u53d1\u5c55\uff0c\u5bf9\u5b9e\u65f6\u8ba1\u7b97\u7684\u9700\u6c42\u4e5f\u8d8a\u6765\u8d8a\u591a\uff0c\u76ee\u524dFlink\u5df2\u5e7f\u6cdb\u5e94\u7528\u4e8e\u5b9e\u65f6ETL\uff0c&hellip; <a href=\"http:\/\/viplao.com\/index.php\/2023\/06\/22\/flink-sql-%e9%97%ae%e9%a2%98%e5%89%96%e6%9e%90%e5%8f%8a%e8%a7%a3%e5%86%b3%e5%ae%9e%e8%b7%b5\/\" class=\"more-link read-more\" rel=\"bookmark\">\u7ee7\u7eed\u9605\u8bfb <span class=\"screen-reader-text\">Flink SQL &#8211; \u95ee\u9898\u5256\u6790\u53ca\u89e3\u51b3\u5b9e\u8df5<\/span><i class=\"fa 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