{"id":2063,"date":"2023-06-22T08:32:58","date_gmt":"2023-06-22T00:32:58","guid":{"rendered":"http:\/\/viplao.com\/?p=2063"},"modified":"2023-06-22T08:33:00","modified_gmt":"2023-06-22T00:33:00","slug":"flink-%e4%bd%9c%e4%b8%9a%e9%97%ae%e9%a2%98%e5%88%86%e6%9e%90%e5%92%8c%e8%b0%83%e4%bc%98%e5%ae%9e%e8%b7%b5","status":"publish","type":"post","link":"http:\/\/viplao.com\/index.php\/2023\/06\/22\/flink-%e4%bd%9c%e4%b8%9a%e9%97%ae%e9%a2%98%e5%88%86%e6%9e%90%e5%92%8c%e8%b0%83%e4%bc%98%e5%ae%9e%e8%b7%b5\/","title":{"rendered":"Flink \u4f5c\u4e1a\u95ee\u9898\u5206\u6790\u548c\u8c03\u4f18\u5b9e\u8df5"},"content":{"rendered":"\n<p><strong>\u7b80\u4ecb\uff1a<\/strong>&nbsp;\u672c\u6587\u4e3b\u8981\u5206\u4eab Flink \u7684 CheckPoint \u673a\u5236\u3001\u53cd\u538b\u673a\u5236\u53ca Flink \u7684\u5185\u5b58\u6a21\u578b\u3002\u5bf9\u8fd93\u90e8\u5206\u5185\u5bb9\u7684\u719f\u6089\u662f\u8c03\u4f18\u7684\u524d\u63d0\uff0c\u6587\u7ae0\u4e3b\u8981\u4ece\u4ee5\u4e0b\u51e0\u4e2a\u90e8\u5206\u5206\u4eab\uff1a\u539f\u7406\u5256\u6790\u3001\u6027\u80fd\u5b9a\u4f4d\u3001\u7ecf\u5178\u573a\u666f\u8c03\u4f18\u3001\u5185\u5b58\u8c03\u4f18\u3002<\/p>\n\n\n\n<p>\u6458\u8981\uff1a\u672c\u6587\u4e3b\u8981\u5206\u4eab Flink \u7684 CheckPoint \u673a\u5236\u3001\u53cd\u538b\u673a\u5236\u53ca Flink \u7684\u5185\u5b58\u6a21\u578b\u3002\u5bf9\u8fd93\u90e8\u5206\u5185\u5bb9\u7684\u719f\u6089\u662f\u8c03\u4f18\u7684\u524d\u63d0\uff0c\u6587\u7ae0\u4e3b\u8981\u4ece\u4ee5\u4e0b\u51e0\u4e2a\u90e8\u5206\u5206\u4eab\uff1a<\/p>\n\n\n\n<ol>\n<li>\u539f\u7406\u5256\u6790<\/li>\n\n\n\n<li>\u6027\u80fd\u5b9a\u4f4d<\/li>\n\n\n\n<li>\u7ecf\u5178\u573a\u666f\u8c03\u4f18<\/li>\n\n\n\n<li>\u5185\u5b58\u8c03\u4f18<\/li>\n<\/ol>\n\n\n\n<p><br>Checkpoint \u673a\u5236<br>1.\u4ec0\u4e48\u662f checkpoint<br>\u7b80\u5355\u5730\u8bf4\u5c31\u662f Flink \u4e3a\u4e86\u8fbe\u5230\u5bb9\u9519\u548c exactly-once \u8bed\u4e49\u7684\u529f\u80fd\uff0c\u5b9a\u671f\u628a state \u6301\u4e45\u5316\u4e0b\u6765\uff0c\u800c\u8fd9\u4e00\u6301\u4e45\u5316\u7684\u8fc7\u7a0b\u5c31\u53eb\u505a checkpoint \uff0c\u5b83\u662f Flink Job \u5728\u67d0\u4e00\u65f6\u523b\u5168\u5c40\u72b6\u6001\u7684\u5feb\u7167\u3002<br>\u5f53\u6211\u4eec\u8981\u5bf9\u5206\u5e03\u5f0f\u7cfb\u7edf\u5b9e\u73b0\u4e00\u4e2a\u5168\u5c40\u72b6\u6001\u4fdd\u7559\u7684\u529f\u80fd\u65f6\uff0c\u4f20\u7edf\u65b9\u6848\u4f1a\u5f15\u5165\u4e00\u4e2a\u7edf\u4e00\u65f6\u949f\uff0c\u901a\u8fc7\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\u7684 master \u8282\u70b9\u5e7f\u64ad\u51fa\u53bb\u7ed9\u6bcf\u4e00\u4e2a slaves \u8282\u70b9\uff0c\u5f53\u8282\u70b9\u63a5\u6536\u5230\u8fd9\u4e2a\u7edf\u4e00\u65f6\u949f\u65f6\uff0c\u5b83\u4eec\u5c31\u8bb0\u5f55\u4e0b\u81ea\u5df1\u5f53\u524d\u7684\u72b6\u6001\u5373\u53ef\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic1.zhimg.com\/80\/v2-7166948455e16c36d23ffad98eb718e4_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u4f46\u662f\u7edf\u4e00\u65f6\u949f\u7684\u65b9\u5f0f\u4e5f\u5b58\u5728\u4e00\u5b9a\u7684\u95ee\u9898\uff0c\u67d0\u4e00\u4e2a node \u8fdb\u884c\u7684 GC \u65f6\u95f4\u6bd4\u8f83\u957f\uff0c\u6216\u8005 master \u4e0e slaves \u7684\u7f51\u7edc\u5728\u5f53\u65f6\u5b58\u5728\u6ce2\u52a8\u800c\u9020\u6210\u65f6\u949f\u7684\u53d1\u9001\u5ef6\u8fdf\u6216\u8005\u53d1\u9001\u5931\u8d25\uff0c\u90fd\u4f1a\u9020\u6210\u6b64 slave \u548c\u5176\u5b83\u7684\u673a\u5668\u51fa\u73b0\u6570\u636e\u4e0d\u4e00\u81f4\u800c\u6700\u7ec8\u5bfc\u81f4\u8111\u88c2\u7684\u60c5\u51b5\u3002\u5982\u679c\u6211\u4eec\u60f3\u8981\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u5c31\u9700\u8981\u5bf9 master \u548c slaves \u505a\u4e00\u4e2a HA\uff08High Availability\uff09\u3002\u4f46\u662f\uff0c\u4e00\u4e2a\u7cfb\u7edf\u8d8a\u662f\u590d\u6742\uff0c\u5c31\u8d8a\u4e0d\u7a33\u5b9a\u4e14\u7ef4\u62a4\u6210\u672c\u8d8a\u9ad8\u3002<br>Flink \u662f\u5c06 checkpoint \u90fd\u653e\u8fdb\u4e86\u4e00\u4e2a\u540d\u4e3a Barrier \u7684\u6d41\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic1.zhimg.com\/80\/v2-b7db441539d05481c65ec63eddea22c0_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u4e0a\u56fe\u4e2d\u5c31\u662f\u4e00\u4e2a Barrier \u7684\u4f8b\u5b50\uff0c\u4ece\u4e0a\u6e38\u7684\u7b2c\u4e00\u4e2a Task \u5230\u4e0b\u6e38\u7684\u6700\u540e\u4e00\u4e2a Task\uff0c\u6bcf\u6b21\u5f53 Task \u7ecf\u8fc7\u56fe\u4e2d\u84dd\u8272\u7684\u6805\u680f\u65f6\uff0c\u5c31\u4f1a\u89e6\u53d1 save snapshot\uff08\u5feb\u7167\uff09\u7684\u529f\u80fd\u3002\u6211\u4eec\u7528\u4e00\u4e2a\u4f8b\u5b50\u6765\u7b80\u5355\u8bf4\u660e\u3002<br>2.\u5b9e\u4f8b\u5206\u6790<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic2.zhimg.com\/80\/v2-c980b3a08a2928b3c39e85c3641b5afd_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u8fd9\u662f\u4e00\u4e2a\u7b80\u5355\u7684 ETL \u8fc7\u7a0b\uff0c\u9996\u5148\u6211\u4eec\u628a\u6570\u636e\u4ece Kafka \u4e2d\u62ff\u8fc7\u6765\u8fdb\u884c\u4e00\u4e2a trans \u7684\u8f6c\u6362\u64cd\u4f5c\uff0c\u7136\u540e\u518d\u53d1\u9001\u5230\u4e00\u4e2a\u4e0b\u6e38\u7684 Kafka<br>\u6b64\u65f6\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\u6ca1\u6709\u8fdb\u884c chaining \u7684\u8c03\u4f18\u3002\u6240\u4ee5\u6b64\u65f6\u91c7\u7528\u7684\u662f forward strategy \uff0c\u4e5f\u5c31\u662f \u201c\u4e00\u4e2a task \u7684\u8f93\u51fa\u53ea\u53d1\u9001\u7ed9\u4e00\u4e2a task \u4f5c\u4e3a\u8f93\u5165\u201d\uff0c\u8fd9\u6837\u7684\u65b9\u5f0f\uff0c\u8fd9\u6837\u505a\u4e5f\u6709\u4e00\u4e2a\u597d\u5904\u5c31\u662f\u5982\u679c\u4e24\u4e2a task \u90fd\u5728\u4e00\u4e2a JVM \u4e2d\u7684\u8bdd\uff0c\u90a3\u4e48\u5c31\u53ef\u4ee5\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u7f51\u7edc\u5f00\u9500<br>\u8bbe\u7f6e Parallism \u4e3a 2\uff0c\u6b64\u65f6\u7684 DAG \u56fe\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-a9f126ee26cd6df30757fa4e42ab0d8e_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u25a0 CK\u7684\u5206\u6790\u8fc7\u7a0b<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-729f1f030d4b20501d33b8eaf4539ebe_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u6bcf\u4e00\u4e2a Flink \u4f5c\u4e1a\u90fd\u4f1a\u6709\u4e00\u4e2a JobManager \uff0cJobManager \u91cc\u9762\u53c8\u4f1a\u6709\u4e00\u4e2a checkpoint coordinator \u6765\u7ba1\u7406\u6574\u4e2a checkpoint \u7684\u8fc7\u7a0b\uff0c\u6211\u4eec\u53ef\u4ee5\u8bbe\u7f6e\u4e00\u4e2a\u65f6\u95f4\u95f4\u9694\u8ba9 checkpoint coordinator \u5c06\u4e00\u4e2a checkpoint \u7684\u4e8b\u4ef6\u53d1\u9001\u7ed9\u6bcf\u4e00\u4e2a Container \u4e2d\u7684 source task\uff0c\u4e5f\u5c31\u662f\u7b2c\u4e00\u4e2a\u4efb\u52a1\uff08\u5bf9\u5e94\u5e76\u884c\u56fe\u4e2d\u7684 task1\uff0ctask2\uff09\u3002<br>\u5f53\u67d0\u4e2a Source \u7b97\u5b50\u6536\u5230\u4e00\u4e2a Barrier \u65f6\uff0c\u5b83\u4f1a\u6682\u505c\u81ea\u8eab\u7684\u6570\u636e\u5904\u7406\uff0c\u7136\u540e\u5c06\u81ea\u5df1\u7684\u5f53\u524d state \u5236\u4f5c\u6210 snapshot\uff08\u5feb\u7167\uff09\uff0c\u5e76\u4fdd\u5b58\u5230\u6307\u5b9a\u7684\u6301\u4e45\u5316\u5b58\u50a8\u4e2d\uff0c\u6700\u540e\u5411 CheckpointCoordinator \u5f02\u6b65\u53d1\u9001\u4e00\u4e2a ack\uff08Acknowledge character &#8212; \u786e\u8ba4\u5b57\u7b26\uff09\uff0c\u540c\u65f6\u5411\u81ea\u8eab\u6240\u6709\u4e0b\u6e38\u7b97\u5b50\u5e7f\u64ad\u8be5 Barrier \u540e\u6062\u590d\u81ea\u8eab\u7684\u6570\u636e\u5904\u7406\u3002<br>\u6bcf\u4e2a\u7b97\u5b50\u6309\u7167\u4e0a\u9762\u4e0d\u65ad\u5236\u4f5c snapshot \u5e76\u5411\u4e0b\u6e38\u5e7f\u64ad\uff0c\u76f4\u5230\u6700\u540e Barrier \u4f20\u9012\u5230 sink \u7b97\u5b50\uff0c\u6b64\u65f6\u5feb\u7167\u4fbf\u5236\u4f5c\u5b8c\u6210\u3002\u8fd9\u65f6\u5019\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u4e0a\u6e38\u7b97\u5b50\u53ef\u80fd\u662f\u591a\u4e2a\u6570\u636e\u6e90\uff0c\u5bf9\u5e94\u591a\u4e2a Barrier \u9700\u8981\u5168\u90e8\u5230\u9f50\u624d\u4e00\u6b21\u6027\u89e6\u53d1 checkpoint \uff0c\u6240\u4ee5\u5728\u9047\u5230 checkpoint \u65f6\u95f4\u8f83\u957f\u7684\u60c5\u51b5\u65f6\uff0c\u6709\u53ef\u80fd\u662f\u56e0\u4e3a\u6570\u636e\u5bf9\u9f50\u9700\u8981\u8017\u8d39\u7684\u65f6\u95f4\u6bd4\u8f83\u957f\u6240\u9020\u6210\u7684\u3002<br>\u25a0 Snapshot &amp; Recover<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-b423919054f3f137fe74fd22897fb5d2_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u5982\u56fe\uff0c\u8fd9\u662f\u6211\u4eec\u7684Container\u5bb9\u5668\u521d\u59cb\u5316\u7684\u9636\u6bb5\uff0ce1 \u548c e2 \u662f\u521a\u4ece Kafka \u6d88\u8d39\u8fc7\u6765\u7684\u6570\u636e\uff0c\u4e0e\u6b64\u540c\u65f6\uff0cCheckpointCoordinator \u4e5f\u5f80\u5b83\u53d1\u9001\u4e86 Barrier\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic1.zhimg.com\/80\/v2-6b566ef227ee9aefa0a2b63590cb711c_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u6b64\u65f6 Task1 \u5b8c\u6210\u4e86\u5b83\u7684 checkpoint \u8fc7\u7a0b\uff0c\u6548\u679c\u5c31\u662f\u8bb0\u5f55\u4e0b offset \u4e3a2\uff08e1\uff0ce2\uff09\uff0c\u7136\u540e\u628a Barrier \u5f80\u4e0b\u6e38\u7684\u7b97\u5b50\u5e7f\u64ad\uff0cTask3 \u7684\u8f93\u5165\u4e3a Task1 \u7684\u8f93\u51fa\uff0c\u73b0\u5728\u5047\u8bbe\u6211\u7684\u8fd9\u4e2a\u7a0b\u5e8f\u7684\u529f\u80fd\u662f\u7edf\u8ba1\u6570\u636e\u7684\u6761\u6570\uff0c\u6b64\u65f6 Task3 \u7684 checkpoint \u6548\u679c\u5c31\u662f\u5c31\u8bb0\u5f55\u6570\u636e\u6570\u4e3a2\uff08\u56e0\u4e3a\u4ece Task1 \u8fc7\u6765\u7684\u6570\u636e\u5c31\u662f e1 \u548c e2 \u4e24\u6761\uff09\uff0c\u4e4b\u540e\u518d\u5c06 Barrier \u5f80\u4e0b\u5e7f\u64ad\uff0c\u5f53\u6b64 Barrier \u4f20\u9012\u5230 sink \u7b97\u5b50\uff0csnapshot \u5c31\u7b97\u662f\u5236\u4f5c\u5b8c\u6210\u4e86\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic4.zhimg.com\/80\/v2-78af6b0027fbe561d30b704fd57e3947_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u6b64\u65f6 source \u4e2d\u8fd8\u4f1a\u6e90\u6e90\u4e0d\u65ad\u7684\u4ea7\u751f\u6570\u636e\uff0c\u5e76\u4ea7\u751f\u65b0\u7684 checkpoint \uff0c\u4f46\u662f\u6b64\u65f6\u5982\u679c Container \u5b95\u673a\u91cd\u542f\u5c31\u9700\u8981\u8fdb\u884c\u6570\u636e\u7684\u6062\u590d\u4e86\u3002\u521a\u521a\u5b8c\u6210\u7684 checkpoint \u4e2d offset\u4e3a2\uff0ccount\u4e3a2\uff0c\u90a3\u6211\u4eec\u5c31\u6309\u7167\u8fd9\u4e2a state \u8fdb\u884c\u6062\u590d\u3002\u6b64\u65f6 Task1 \u4f1a\u4ece e3 \u5f00\u59cb\u6d88\u8d39\uff0c\u8fd9\u5c31\u662f Recover \u64cd\u4f5c\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic1.zhimg.com\/80\/v2-ec44ccd3840d6191c76508d00467f494_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u25a0 checkpoint \u7684\u6ce8\u610f\u4e8b\u9879<br>\u4e0b\u9762\u5217\u4e3e\u76843\u4e2a\u6ce8\u610f\u8981\u70b9\u90fd\u4f1a\u5f71\u54cd\u5230\u7cfb\u7edf\u7684\u541e\u5410\uff0c\u5728\u5b9e\u9645\u5f00\u53d1\u8fc7\u7a0b\u4e2d\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic2.zhimg.com\/80\/v2-89ae79b07f29bcbcc46fa28e0cad75f5_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>3.\u80cc\u538b\u7684\u4ea7\u751f\u53ca Flink \u7684\u53cd\u538b\u5904\u7406<br>\u5728\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\u7ecf\u5e38\u4f1a\u51fa\u73b0\u591a\u4e2a Task \u591a\u4e2a JVM \u4e4b\u95f4\u53ef\u80fd\u9700\u8981\u505a\u6570\u636e\u7684\u4ea4\u6362\uff0c\u6211\u4eec\u4f7f\u7528\u751f\u4ea7\u8005\u548c\u6d88\u8d39\u8005\u6765\u8bf4\u660e\u8fd9\u4e2a\u4e8b\u60c5\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-09bf8c42af261c0c6f7e8b7bd60490be_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u5047\u8bbe\u6211\u73b0\u5728\u7684 Producer \u662f\u4f7f\u7528\u4e86\u65e0\u754c buffer \u6765\u8fdb\u884c\u5b58\u50a8\uff0c\u5f53\u6211\u4eec\u7684\u751f\u4ea7\u8005\u751f\u4ea7\u901f\u5ea6\u8fdc\u5927\u4e8e\u6d88\u8d39\u8005\u6d88\u8d39\u7684\u901f\u5ea6\u65f6\uff0c\u751f\u4ea7\u7aef\u7684\u6570\u636e\u4f1a\u56e0\u4e3a\u6d88\u8d39\u7aef\u7684\u6d88\u8d39\u80fd\u529b\u4f4e\u4e0b\u800c\u5bfc\u81f4\u6570\u636e\u79ef\u538b\uff0c\u6700\u7ec8\u5bfc\u81f4 OOM \u7684\u4ea7\u751f\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-355f7b45e79d1fb58d2c9fc199d4f19e_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u800c\u5c31\u7b97\u4f7f\u7528\u4e86\u6709\u754c buffer\uff0c\u540c\u6837\u6d88\u8d39\u8005\u7aef\u7684\u6d88\u8d39\u80fd\u529b\u4f4e\u4e0b\uff0c\u5f53 buffer \u88ab\u79ef\u6ee1\u65f6\u751f\u4ea7\u8005\u5c31\u4f1a\u505c\u6b62\u751f\u4ea7\uff0c\u8fd9\u6837\u8fd8\u4e0d\u80fd\u5b8c\u5168\u5730\u89e3\u51b3\u6211\u4eec\u7684\u95ee\u9898\uff0c\u6240\u4ee5\u5c31\u9700\u8981\u6839\u636e\u4e0d\u540c\u7684\u60c5\u51b5\u8fdb\u884c\u8c03\u6574\u3002<br>Flink \u4e5f\u662f\u901a\u8fc7\u6709\u754c buffer \u6765\u8fdb\u884c\u4e0d\u540c TaskManager \u7684\u6570\u636e\u4ea4\u6362\u3002\u800c\u4e14\u505a\u6cd5\u5206\u4e3a\u4e86\u9759\u6001\u63a7\u6d41\u548c\u52a8\u6001\u63a7\u6d41\u4e24\u79cd\u65b9\u5f0f\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic4.zhimg.com\/80\/v2-98951e040fcf8054b788b9ffea31b77f_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u7b80\u5355\u6765\u8bf4\u5c31\u662f\u5f53\u751f\u4ea7\u8005\u6bd4\u6d88\u8d39\u8005\u7684 TPS \u591a\u65f6\uff0c\u6211\u4eec\u91c7\u7528\u6ea2\u5199\u7684\u65b9\u5f0f\uff0c\u4f7f\u7528 batch \u6765\u5c01\u88c5\u597d\u6211\u4eec\u7684\u6570\u636e\uff0c\u7136\u540e\u5206\u6279\u53d1\u9001\u51fa\u53bb\uff0c\u6bcf\u6b21\u53d1\u9001\u5b8c\u6210\u540e\u518d sleep \u4e00\u6bb5\u65f6\u95f4\uff0c\u8fd9\u4e2a\u65f6\u95f4\u7684\u8ba1\u7b97\u65b9\u5f0f\u662f left\uff08\u5269\u4f59\u7684\u6570\u636e\uff09\/ tps\uff0c\u4f46\u662f\u8fd9\u4e2a\u505a\u6cd5\u662f\u5f88\u96be\u53bb\u9884\u4f30\u7cfb\u7edf\u7684\u60c5\u51b5\u7684\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic2.zhimg.com\/80\/v2-c70cef74a4b4fd3abce7f1a470f98585_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>Flink 1.5 \u4e4b\u524d\u7684\u6d41\u63a7\u662f\u57fa\u4e8e TCP \u7684\u6ed1\u52a8\u7a97\u53e3\u5b9e\u73b0\u7684\uff0c\u5728\u4e4b\u524d\u7684\u8bfe\u7a0b\u4e2d\u5df2\u7ecf\u6709\u63d0\u5230\u8fc7\u4e86\u3002\u800c Flink \u57281.5\u4e4b\u540e\u5df2\u7ecf\u5f03\u7528\u4e86\u8be5\u673a\u5236\uff0c\u6240\u4ee5\u8fd9\u91cc\u4e0d\u5c55\u5f00\u8bf4\u660e\u3002\u5728\u6b64\u7f51\u7edc\u6a21\u578b\u4e2d\uff0c\u6570\u636e\u751f\u6210\u8282\u70b9\u53ea\u80fd\u901a\u8fc7\u68c0\u67e5\u5f53\u524d\u7684 channel \u662f\u5426\u53ef\u5199\u6765\u51b3\u5b9a\u81ea\u5df1\u662f\u5426\u8981\u5411\u6d88\u8d39\u7aef\u53d1\u9001\u6570\u636e\uff0c\u5b83\u5bf9\u4e0b\u6e38\u6570\u636e\u6d88\u8d39\u7aef\u7684\u771f\u5b9e\u5bb9\u91cf\u60c5\u51b5\u4e00\u6982\u4e0d\u77e5\u3002\u8fd9\u5c31\u5bfc\u81f4\uff0c\u5f53\u751f\u6210\u8282\u70b9\u53d1\u73b0 channel \u5df2\u7ecf\u4e0d\u53ef\u5199\u7684\u65f6\u5019\uff0c\u6709\u53ef\u80fd\u4e0b\u6e38\u6d88\u8d39\u8282\u70b9\u5df2\u7ecf\u79ef\u538b\u4e86\u5f88\u591a\u6570\u636e\u3002<br>Credit-Based \u6211\u4eec\u7528\u4e0b\u9762\u7684\u6570\u636e\u4ea4\u6362\u7684\u4f8b\u5b50\u8bf4\u660e\uff1a<br>Flink \u7684\u6570\u636e\u4ea4\u6362\u5927\u81f4\u5206\u4e3a\u4e09\u79cd\uff0c\u4e00\u79cd\u662f\u540c\u4e00\u4e2a Task \u7684\u6570\u636e\u4ea4\u6362\uff0c\u53e6\u4e00\u79cd\u662f \u4e0d\u540c Task \u540c JVM \u4e0b\u7684\u6570\u636e\u4ea4\u6362\u3002\u7b2c\u4e09\u79cd\u5c31\u662f\u4e0d\u540c Task \u4e14\u4e0d\u540c JVM \u4e4b\u95f4\u7684\u4ea4\u6362\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic1.zhimg.com\/80\/v2-4c8c04e08942e005e8ada5bfb3691cf8_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u540c\u4e00\u4e2a Task \u7684\u6570\u636e\u4ea4\u6362\u5c31\u662f\u6211\u4eec\u521a\u521a\u63d0\u5230\u7684 forward strategy \u65b9\u5f0f\uff0c\u4e3b\u8981\u5c31\u662f\u907f\u514d\u4e86\u5e8f\u5217\u5316\u548c\u7f51\u7edc\u7684\u5f00\u9500\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-9edc27ce9c956af50c57916622f62252_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u7b2c\u4e8c\u79cd\u6570\u636e\u4ea4\u6362\u7684\u65b9\u5f0f\u5c31\u662f\u6570\u636e\u4f1a\u5148\u901a\u8fc7\u4e00\u4e2a record Writer \uff0c\u6570\u636e\u5728\u91cc\u9762\u8fdb\u884c\u5e8f\u5217\u5316\u4e4b\u540e\u518d\u4f20\u9012\u7ed9 Result Partition \uff0c\u4e4b\u540e\u6570\u636e\u4f1a\u901a\u8fc7 local channel \u4f20\u9012\u7ed9\u53e6\u5916\u4e00\u4e2a Task \u7684 Input Gate \u91cc\u9762\uff0c\u518d\u8fdb\u884c\u53cd\u5e8f\u5217\u5316\uff0c\u63a8\u9001\u7ed9 Record Reader \u4e4b\u540e\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic4.zhimg.com\/80\/v2-1f023e71ef9aba5c04220c058bcb468b_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u56e0\u4e3a\u7b2c\u4e09\u79cd\u6570\u636e\u4ea4\u6362\u6d89\u53ca\u5230\u4e86\u4e0d\u540c\u7684 JVM\uff0c\u6240\u4ee5\u4f1a\u6709\u4e00\u5b9a\u7684\u7f51\u7edc\u5f00\u9500\uff0c\u548c\u7b2c\u4e8c\u79cd\u7684\u533a\u522b\u5c31\u5728\u4e8e\u5b83\u5148\u63a8\u7ed9\u4e86 Netty \uff0c\u901a\u8fc7netty\u628a\u6570\u636e\u63a8\u9001\u5230\u8fdc\u7a0b\u7aef\u7684 Task \u4e0a\u3002<br>\u25a0 Credit-Based<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-775d97e73f648716418399acf17ce2ee_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u6b64\u65f6\u6211\u4eec\u53ef\u4ee5\u770b\u5230 event1 \u5df2\u7ecf\u8fde\u5e26\u4e00\u4e2a backlog = 1 \u63a8\u9001\u7ed9\u4e86 TaskB\uff0cbacklog \u7684\u4f5c\u7528\u5176\u5b9e\u53ea\u662f\u4e3a\u4e86\u8ba9\u6d88\u8d39\u7aef\u611f\u77e5\u5230\u6211\u4eec\u751f\u4ea7\u7aef\u7684\u60c5\u51b5<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic2.zhimg.com\/80\/v2-76a6dedd04b886f0354bbf802f5e8b95_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u6b64\u65f6 event1 \u88ab TaskB \u63a5\u6536\u540e\uff0cTaskB\u4f1a\u8fd4\u56de\u4e00\u4e2a ack \u7ed9 TaskA\uff0c\u540c\u65f6\u8fd4\u56de\u4e00\u4e2acredit = 3\uff0c\u8fd9\u4e2a\u662f\u544a\u77e5 TaskA \u5b83\u8fd8\u80fd\u63a5\u6536\u591a\u5c11\u6761\u6570\u636e\uff0cFlink \u5c31\u662f\u901a\u8fc7\u8fd9\u79cd\u4e92\u76f8\u544a\u77e5\u7684\u65b9\u5f0f\uff0c\u6765\u8ba9\u751f\u4ea7\u8005\u548c\u6d88\u8d39\u8005\u90fd\u80fd\u611f\u77e5\u5230\u5bf9\u65b9\u7684\u72b6\u6001\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic4.zhimg.com\/80\/v2-c8d9bba5686f2d8053c5994e649706df_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u6b64\u65f6\u7ecf\u8fc7\u4e00\u6bb5\u65f6\u95f4\u4e4b\u540e\uff0cTaskB\u4e2d\u7684\u6709\u754c buffer \u5df2\u7ecf\u6ee1\u4e86\uff0c\u6b64\u65f6 TaskB\u56de\u590d credit = 0 \u7ed9 TaskA\uff0c\u6b64\u65f6 channel \u901a\u9053\u5c06\u4f1a\u505c\u6b62\u5de5\u4f5c\uff0cTaskA \u4e0d\u518d\u5c06\u6570\u636e\u53d1\u5f80 TaskB\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic2.zhimg.com\/80\/v2-84fa832adc419127a047bd6f93cc4bc5_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-d7836647d745a21550e4124d094d26ee_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u6b64\u65f6\u518d\u7ecf\u8fc7\u4e00\u6bb5\u65f6\u95f4\uff0cTaskA \u4e2d\u7684\u6709\u754c Buffer \u4e5f\u5df2\u7ecf\u51fa\u73b0\u4e86\u6570\u636e\u79ef\u538b\uff0c\u6240\u4ee5\u6211\u4eec\u5e73\u65f6\u9047\u5230\u7684\u541e\u5410\u4e0b\u964d\uff0c\u5904\u7406\u5ef6\u8fdf\u7684\u95ee\u9898\uff0c\u5c31\u662f\u56e0\u4e3a\u6b64\u65f6\u6574\u4e2a\u7cfb\u7edf\u76f8\u5f53\u4e8e\u4e00\u4e2a\u505c\u6ede\u7684\u72b6\u6001\uff0c\u5982\u56fe\u4e8c\u793a\uff0c\u6240\u6709\u7684\u8fc7\u7a0b\u90fd\u88ab\u6253\u4e0a \u201cX\u201d\uff0c\u8868\u793a\u8fd9\u4e9b\u8fc7\u7a0b\u90fd\u5df2\u7ecf\u505c\u6b62\u5de5\u4f5c\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic1.zhimg.com\/80\/v2-b0c7b1406d0b748805c9365c2d0d6ddc_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>JVM \u662f\u4e00\u4e2a\u975e\u5e38\u590d\u6742\u7684\u7cfb\u7edf\uff0c\u5f53\u5176\u5185\u5b58\u4e0d\u8db3\u65f6\u4f1a\u9020\u6210 OOM \uff0c\u5bfc\u81f4\u7cfb\u7edf\u7684\u5d29\u6e83\u3002Flink \u5728\u62ff\u5230\u6211\u4eec\u5206\u914d\u7684\u5185\u5b58\u4e4b\u540e\u4f1a\u5148\u5206\u914d\u4e00\u4e2a cutoff \u9884\u7559\u5185\u5b58\uff0c\u4fdd\u8bc1\u7cfb\u7edf\u7684\u5b89\u5168\u6027\u3002Netword buffers \u5176\u5b9e\u5c31\u662f\u5bf9\u5e94\u6211\u4eec\u521a\u521a\u4e00\u76f4\u63d0\u5230\u7684\u6709\u754c buffer\uff0cmomery manager \u662f\u4e00\u4e2a\u5185\u5b58\u6c60\uff0c\u8fd9\u90e8\u5206\u7684\u5185\u5b58\u53ef\u4ee5\u8bbe\u7f6e\u4e3a\u5806\u5185\u6216\u8005\u5806\u5916\u7684\u5185\u5b58\uff0c\u5f53\u7136\u5728\u6d41\u5f0f\u4f5c\u4e1a\u4e2d\u6211\u4eec\u4e00\u822c\u8bbe\u7f6e\u5176\u4e3a\u5806\u5916\u5185\u5b58\uff0c\u800c Free \u90e8\u5206\u5c31\u662f\u63d0\u4f9b\u7ed9\u7528\u6237\u4f7f\u7528\u7684\u5185\u5b58\u5757\u3002<br>\u73b0\u5728\u6211\u4eec\u5047\u8bbe\u5206\u914d\u7ed9\u6b64 TaskManager \u7684\u5185\u5b58\u662f 8g\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-2fcf60abfe3ef2eb706acc996eeea482_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<ol>\n<li>\u9996\u5148\u662f\u8981\u780d\u6389 cutoff \u7684\u90e8\u5206\uff0c\u9ed8\u8ba4\u662f0.25\uff0c\u6240\u4ee5\u6211\u4eec\u7684\u53ef\u7528\u5185\u5b58\u5c31\u662f 8gx0.75<\/li>\n\n\n\n<li>network buffers \u5360\u7528\u53ef\u7528\u5185\u5b58\u7684 0.1 \uff0c\u6240\u4ee5\u662f 6144&#215;0.1<\/li>\n\n\n\n<li>\u5806\u5185\/\u5806\u5916\u5185\u5b58\u4e3a\u53ef\u7528\u5185\u5b58\u51cf\u53bb network buffers \u7684\u90e8\u5206\uff0c\u518d\u4e58\u4ee5 0.8<\/li>\n\n\n\n<li>\u7ed9\u5230\u7528\u6237\u4f7f\u7528\u7684\u5185\u5b58\u5c31\u662f\u5806\u5185\u5b58\u5269\u4e0b\u7684 0.2 \u90a3\u90e8\u5206<\/li>\n<\/ol>\n\n\n\n<p>\u5176\u5b9e\u771f\u5b9e\u60c5\u51b5\u662f Flink \u662f\u5148\u77e5\u9053\u4e86 heap \u5185\u5b58\u7684\u5927\u5c0f\u7136\u540e\u9006\u63a8\u51fa\u5176\u5b83\u5185\u5b58\u7684\u5927\u5c0f\u3002<br>Flink \u4f5c\u4e1a\u7684\u95ee\u9898\u5b9a\u4f4d<br>1.\u95ee\u9898\u5b9a\u4f4d\u53e3\u8bc0<br>\u201c<strong>\u4e00\u538b\u4e8c\u67e5\u4e09\u6307\u6807\uff0c\u5ef6\u8fdf\u541e\u5410\u662f\u6838\u5fc3<\/strong>\u3002<br><strong>\u65f6\u523b\u5173\u6ce8\u8d44\u6e90\u91cf , \u6392\u67e5\u9996\u5148\u770bGC<\/strong>\u3002\u201d<br>\u4e00\u538b\u662f\u6307\u80cc\u538b\uff0c\u9047\u5230\u95ee\u9898\u5148\u770b\u80cc\u538b\u7684\u60c5\u51b5\uff0c\u4e8c\u67e5\u5c31\u662f\u6307 checkpoint \uff0c\u5bf9\u9f50\u6570\u636e\u7684\u65f6\u95f4\u662f\u5426\u5f88\u957f\uff0cstate \u662f\u5426\u5f88\u5927\uff0c\u8fd9\u4e9b\u90fd\u662f\u548c\u7cfb\u7edf\u541e\u5410\u5bc6\u5207\u76f8\u5173\u7684\uff0c\u4e09\u6307\u6807\u5c31\u662f\u6307 Flink UI \u90a3\u5757\u7684\u4e00\u4e9b\u5c55\u793a\uff0c\u6211\u4eec\u7684\u4e3b\u8981\u5173\u6ce8\u70b9\u5176\u5b9e\u5c31\u662f\u5ef6\u8fdf\u548c\u541e\u5410\uff0c\u7cfb\u7edf\u8d44\u6e90\uff0c\u8fd8\u6709\u5c31\u662f GC logs\u3002<\/p>\n\n\n\n<ul>\n<li>\u770b\u53cd\u538b\uff1a\u901a\u5e38\u6700\u540e\u4e00\u4e2a\u88ab\u538b\u9ad8\u7684 subTask \u7684\u4e0b\u6e38\u5c31\u662f job \u7684\u74f6\u9888\u4e4b\u4e00\u3002<\/li>\n\n\n\n<li>\u770b Checkpoint \u65f6\u957f\uff1aCheckpoint \u65f6\u957f\u80fd\u5728\u4e00\u5b9a\u7a0b\u5ea6\u5f71\u54cd job \u7684\u6574\u4f53\u541e\u5410\u3002<\/li>\n\n\n\n<li>\u770b\u6838\u5fc3\u6307\u6807\uff1a\u6307\u6807\u662f\u5bf9\u4e00\u4e2a\u4efb\u52a1\u6027\u80fd\u7cbe\u51c6\u5224\u65ad\u7684\u4f9d\u636e\uff0c\u5ef6\u8fdf\u6307\u6807\u548c\u541e\u5410\u5219\u662f\u5176\u4e2d\u6700\u4e3a\u5173\u952e\u7684\u6307\u6807\u3002<\/li>\n\n\n\n<li>\u8d44\u6e90\u7684\u4f7f\u7528\u7387\uff1a\u63d0\u9ad8\u8d44\u6e90\u7684\u5229\u7528\u7387\u662f\u6700\u7ec8\u7684\u76ee\u7684\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u25a0 \u5e38\u89c1\u7684\u6027\u80fd\u95ee\u9898<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic2.zhimg.com\/80\/v2-c094a8701a60390f1a600a0970895565_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u7b80\u5355\u89e3\u91ca\u4e00\u4e0b\uff1a<\/p>\n\n\n\n<ol>\n<li>\u5728\u5173\u6ce8\u80cc\u538b\u7684\u65f6\u5019\u5927\u5bb6\u5f80\u5f80\u5ffd\u7565\u4e86\u6570\u636e\u7684\u5e8f\u5217\u5316\u548c\u53cd\u5e8f\u5217\u5316\u8fc7\u7a0b\u6240\u9020\u6210\u7684\u6027\u80fd\u95ee\u9898\u3002<\/li>\n\n\n\n<li>\u4e00\u4e9b\u6570\u636e\u7ed3\u6784\uff0c\u6bd4\u5982 HashMap \u548c HashSet \u8fd9\u79cd key \u9700\u8981\u7ecf\u8fc7 hash \u8ba1\u7b97\u7684\u6570\u636e\u7ed3\u6784\uff0c\u5728\u6570\u636e\u91cf\u5927\u7684\u65f6\u5019\u4f7f\u7528 keyby \u8fdb\u884c\u64cd\u4f5c\uff0c \u9020\u6210\u7684\u6027\u80fd\u5f71\u54cd\u662f\u975e\u5e38\u5927\u7684\u3002<\/li>\n\n\n\n<li>\u6570\u636e\u503e\u659c\u662f\u6211\u4eec\u7684\u7ecf\u5178\u95ee\u9898\uff0c\u540e\u9762\u518d\u8fdb\u884c\u5c55\u5f00\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u6211\u4eec\u7684\u4e0b\u6e38\u662f MySQL\uff0cHBase \u8fd9\u79cd\uff0c\u6211\u4eec\u90fd\u4f1a\u8fdb\u884c\u4e00\u4e2a\u6279\u5904\u7406\u7684\u64cd\u4f5c\uff0c\u5c31\u662f\u8ba9\u6570\u636e\u5b58\u50a8\u5230\u4e00\u4e2a buffer \u91cc\u9762\uff0c\u5728\u8fbe\u5230\u67d0\u4e9b\u6761\u4ef6\u7684\u65f6\u5019\u518d\u8fdb\u884c\u53d1\u9001\uff0c\u8fd9\u6837\u505a\u7684\u76ee\u7684\u5c31\u662f\u51cf\u5c11\u548c\u5916\u90e8\u7cfb\u7edf\u7684\u4ea4\u4e92\uff0c\u964d\u4f4e\u7f51\u7edc\u5f00\u9500\u7684\u6210\u672c\u3002<\/li>\n\n\n\n<li>\u9891\u7e41 GC \uff0c\u65e0\u8bba\u662f CMS \u4e5f\u597d\uff0cG1 \u4e5f\u597d\uff0c\u5728\u8fdb\u884c GC \u7684\u65f6\u5019\uff0c\u90fd\u4f1a\u505c\u6b62\u6574\u4e2a\u4f5c\u4e1a\u7684\u8fd0\u884c\uff0cGC \u65f6\u95f4\u8f83\u957f\u8fd8\u4f1a\u5bfc\u81f4 JobManager \u548c TaskManager \u6ca1\u6709\u529e\u6cd5\u51c6\u65f6\u53d1\u9001\u5fc3\u8df3\uff0c\u6b64\u65f6 JobManager \u5c31\u4f1a\u8ba4\u4e3a\u6b64 TaskManager \u5931\u8054\uff0c\u5b83\u5c31\u4f1a\u53e6\u5916\u5f00\u542f\u4e00\u4e2a\u65b0\u7684 TaskManager<\/li>\n\n\n\n<li>\u7a97\u53e3\u662f\u4e00\u79cd\u53ef\u4ee5\u628a\u65e0\u9650\u6570\u636e\u5207\u5272\u4e3a\u6709\u9650\u6570\u636e\u5757\u7684\u624b\u6bb5\u3002\u6bd4\u5982\u6211\u4eec\u77e5\u9053\uff0c\u4f7f\u7528\u6ed1\u52a8\u7a97\u53e3\u7684\u65f6\u5019\u6570\u636e\u7684\u91cd\u53e0\u95ee\u9898\uff0csize = 5min \u867d\u7136\u4e0d\u5c5e\u4e8e\u5927\u7a97\u53e3\u7684\u8303\u7574\uff0c\u53ef\u662f step = 1s \u4ee3\u88681\u79d2\u5c31\u8981\u8fdb\u884c\u4e00\u6b21\u6570\u636e\u7684\u5904\u7406\uff0c\u8fd9\u6837\u5c31\u4f1a\u9020\u6210\u6570\u636e\u7684\u91cd\u53e0\u5f88\u9ad8\uff0c\u6570\u636e\u91cf\u5f88\u5927\u7684\u95ee\u9898\u3002<\/li>\n<\/ol>\n\n\n\n<p>2.Flink \u4f5c\u4e1a\u8c03\u4f18<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic4.zhimg.com\/80\/v2-a9dee24501b0fd5406bd826ec413f583_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic2.zhimg.com\/80\/v2-3db66169e8b508e856c60aad501751b1_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e00\u4e9b\u6570\u636e\u7ed3\u6784\uff0c\u6bd4\u5982 Set \u6216\u8005 Map \u6765\u7ed3\u5408 Flink state \u8fdb\u884c\u53bb\u91cd\u3002\u4f46\u662f\u8fd9\u4e9b\u53bb\u91cd\u65b9\u6848\u4f1a\u968f\u7740\u6570\u636e\u91cf\u4e0d\u65ad\u589e\u5927\uff0c\u4ece\u800c\u5bfc\u81f4\u6027\u80fd\u7684\u6025\u5267\u4e0b\u964d\uff0c\u6bd4\u5982\u521a\u521a\u6211\u4eec\u5206\u6790\u8fc7\u7684 hash \u51b2\u7a81\u5e26\u6765\u7684\u5199\u5165\u6027\u80fd\u95ee\u9898\uff0c\u5185\u5b58\u8fc7\u5927\u5bfc\u81f4\u7684 GC \u95ee\u9898\uff0cTaskManger \u7684\u5931\u8054\u95ee\u9898\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic4.zhimg.com\/80\/v2-afd0e0824621913ec3bba5c73d0eeddb_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic1.zhimg.com\/80\/v2-e54c6c3ea5d5f81aa68a77f8d3f32668_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic1.zhimg.com\/80\/v2-808ca570dcbea39a37ce9bc7f0f53b40_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic1.zhimg.com\/80\/v2-648451f7d49016daac2718d79878f43c_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u65b9\u6848\u4e8c\u548c\u65b9\u6848\u4e09\u4e5f\u90fd\u662f\u901a\u8fc7\u4e00\u4e9b\u6570\u636e\u7ed3\u6784\u7684\u624b\u6bb5\u53bb\u8fdb\u884c\u53bb\u91cd\uff0c\u6709\u5174\u8da3\u7684\u540c\u5b66\u53ef\u4ee5\u81ea\u884c\u4e0b\u53bb\u4e86\u89e3\uff0c\u5728\u8fd9\u91cc\u4e0d\u518d\u5c55\u5f00\u3002<br>\u25a0 \u6570\u636e\u503e\u659c<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic2.zhimg.com\/80\/v2-00c18e345ce34ded8e6853eae090bb85_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u6570\u636e\u503e\u659c\u662f\u5927\u5bb6\u90fd\u4f1a\u9047\u5230\u7684\u9ad8\u9891\u95ee\u9898\uff0c\u89e3\u51b3\u7684\u65b9\u6848\u4e5f\u4e0d\u5c11\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-ca4ddcb07e2b2faf7a553cf7ecea790e_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u7b2c\u4e00\u79cd\u573a\u666f\u662f\u5f53\u6211\u4eec\u7684\u5e76\u53d1\u5ea6\u8bbe\u7f6e\u7684\u6bd4\u5206\u533a\u6570\u8981\u4f4e\u65f6\uff0c\u5c31\u4f1a\u9020\u6210\u4e0a\u9762\u6240\u8bf4\u7684\u6d88\u8d39\u4e0d\u5747\u5300\u7684\u60c5\u51b5\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic1.zhimg.com\/80\/v2-6e9eb244206c17f4b526137b409f4ee4_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u7b2c\u4e8c\u79cd\u63d0\u5230\u7684\u5c31\u662f key \u5206\u5e03\u4e0d\u5747\u5300\u7684\u60c5\u51b5\uff0c\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u968f\u673a\u524d\u7f00\u6253\u6563\u5b83\u4eec\u7684\u5206\u5e03\uff0c\u4f7f\u5f97\u6570\u636e\u4e0d\u4f1a\u96c6\u4e2d\u5728\u51e0\u4e2a Task \u4e2d\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-aa633bcdbe1b1aa7080070239dbcb9be_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u5728\u6bcf\u4e2a\u8282\u70b9\u672c\u5730\u5bf9\u76f8\u540c\u7684 key \u8fdb\u884c\u4e00\u6b21\u805a\u5408\u64cd\u4f5c\uff0c\u7c7b\u4f3c\u4e8e MapReduce \u4e2d\u7684\u672c\u5730 combiner\u3002map-side \u9884\u805a\u5408\u4e4b\u540e\uff0c\u6bcf\u4e2a\u8282\u70b9\u672c\u5730\u5c31\u53ea\u4f1a\u6709\u4e00\u6761\u76f8\u540c\u7684 key\uff0c\u56e0\u4e3a\u591a\u6761\u76f8\u540c\u7684 key \u90fd\u88ab\u805a\u5408\u8d77\u6765\u4e86\u3002\u5176\u4ed6\u8282\u70b9\u5728\u62c9\u53d6\u6240\u6709\u8282\u70b9\u4e0a\u7684\u76f8\u540c key \u65f6\uff0c\u5c31\u4f1a\u5927\u5927\u51cf\u5c11\u9700\u8981\u62c9\u53d6\u7684\u6570\u636e\u6570\u91cf\uff0c\u4ece\u800c\u4e5f\u5c31\u51cf\u5c11\u4e86\u78c1\u76d8 IO \u4ee5\u53ca\u7f51\u7edc\u4f20\u8f93\u5f00\u9500\u3002<br>\u25a0 \u5185\u5b58\u8c03\u4f18<br>Flink \u7684\u5185\u5b58\u7ed3\u6784\u521a\u521a\u6211\u4eec\u5df2\u7ecf\u63d0\u53ca\u5230\u4e86\uff0c\u6240\u4ee5\u6211\u4eec\u6e05\u695a\uff0c\u8c03\u4f18\u7684\u65b9\u9762\u4e3b\u8981\u662f\u9488\u5bf9 \u975e\u5806\u5185\u5b58 Network buffer \uff0cmanager pool \u548c\u5806\u5185\u5b58\u7684\u8c03\u4f18\uff0c\u8fd9\u4e9b\u57fa\u672c\u90fd\u662f\u901a\u8fc7\u53c2\u6570\u6765\u8fdb\u884c\u63a7\u5236\u7684\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-0c217594be0b8ffbe9fc0a74cd35d3e6_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u8fd9\u4e9b\u53c2\u6570\u6211\u4eec\u90fd\u9700\u8981\u7ed3\u5408\u81ea\u8eab\u7684\u60c5\u51b5\u53bb\u8fdb\u884c\u8c03\u6574\uff0c\u8fd9\u91cc\u53ea\u7ed9\u51fa\u4e00\u4e9b\u5efa\u8bae\u3002\u800c\u4e14\u5bf9\u4e8e ManagerBuffer \u6765\u8bf4\uff0cFlink \u7684\u6d41\u5f0f\u4f5c\u4e1a\u73b0\u5728\u5e76\u6ca1\u6709\u8fc7\u591a\u4f7f\u7528\u5230\u8fd9\u90e8\u5206\u7684\u5185\u5b58\uff0c\u6240\u4ee5\u6211\u4eec\u90fd\u4f1a\u8bbe\u7f6e\u5f97\u6bd4\u8f83\u5c0f\uff0c\u4e0d\u8d85\u8fc70.3\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic1.zhimg.com\/80\/v2-107731ef8ab1cbcb4aa282ca8e6715a8_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u5806\u5185\u5b58\u7684\u8c03\u4f18\u662f\u5173\u4e8e JVM \u65b9\u9762\u7684\uff0c\u4e3b\u8981\u5c31\u662f\u5c06\u9ed8\u8ba4\u4f7f\u7528\u7684\u5783\u573e\u56de\u6536\u5668\u6539\u4e3a G1 \uff0c\u56e0\u4e3a\u9ed8\u8ba4\u4f7f\u7528\u7684 Parallel Scavenge \u5bf9\u4e8e\u8001\u5e74\u4ee3\u7684 GC \u5b58\u5728\u4e00\u4e2a\u4e32\u884c\u5316\u7684\u95ee\u9898\uff0c\u5b83\u7684 Full GC \u8017\u65f6\u8f83\u957f\uff0c\u4e0b\u9762\u662f\u5173\u4e8e G1 \u7684\u4e00\u4e9b\u4ecb\u7ecd\uff0c\u7f51\u4e0a\u8d44\u6599\u4e5f\u975e\u5e38\u591a\uff0c\u8fd9\u91cc\u5c31\u4e0d\u5c55\u5f00\u8bf4\u660e\u4e86\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-68fdc36db387f80b6f876ddb722a6aee_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic2.zhimg.com\/80\/v2-d5423aa6c33793fddbf099be103cd539_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic4.zhimg.com\/80\/v2-fefc956eea6ddf5dc408e25cfda12ad3_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u603b \u7ed3<br>\u672c\u6587\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86 Flink \u7684 CheckPoint \u673a\u5236\uff0c\u53cd\u538b\u673a\u5236\u53ca Flink \u7684\u5185\u5b58\u6a21\u578b\u548c\u57fa\u4e8e\u5185\u5b58\u6a21\u578b\u5206\u6790\u4e86\u4e00\u4e9b\u8c03\u4f18\u7684\u7b56\u7565\u3002\u5e0c\u671b\u80fd\u5bf9\u5927\u5bb6\u6709\u6240\u5e2e\u52a9\uff0c\u539f\u6587\u5206\u4eab\u7684\u89c6\u9891\u56de\u987e\u53ef\u79fb\u6b65\u4e0b\u65b9\u94fe\u63a5\uff1a<br><a href=\"https:\/\/link.zhihu.com\/?target=https%3A\/\/ververica.cn\/developers\/flink-training-course-operation\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/ververica.cn\/developers<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7b80\u4ecb\uff1a&nbsp;\u672c\u6587\u4e3b\u8981\u5206\u4eab Flink \u7684 CheckPoint \u673a\u5236\u3001\u53cd\u538b\u673a\u5236\u53ca Flink &hellip; <a href=\"http:\/\/viplao.com\/index.php\/2023\/06\/22\/flink-%e4%bd%9c%e4%b8%9a%e9%97%ae%e9%a2%98%e5%88%86%e6%9e%90%e5%92%8c%e8%b0%83%e4%bc%98%e5%ae%9e%e8%b7%b5\/\" class=\"more-link read-more\" rel=\"bookmark\">\u7ee7\u7eed\u9605\u8bfb <span class=\"screen-reader-text\">Flink \u4f5c\u4e1a\u95ee\u9898\u5206\u6790\u548c\u8c03\u4f18\u5b9e\u8df5<\/span><i class=\"fa fa-arrow-right\"><\/i><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[25],"views":866,"_links":{"self":[{"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/posts\/2063"}],"collection":[{"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/comments?post=2063"}],"version-history":[{"count":1,"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/posts\/2063\/revisions"}],"predecessor-version":[{"id":2064,"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/posts\/2063\/revisions\/2064"}],"wp:attachment":[{"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/media?parent=2063"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/categories?post=2063"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/tags?post=2063"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}