{"id":121712,"date":"2026-11-03T12:16:44","date_gmt":"2026-11-03T04:16:44","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/121712.html"},"modified":"2026-11-03T12:16:44","modified_gmt":"2026-11-03T04:16:44","slug":"flink-%e5%86%85%e5%ad%98%e6%a8%a1%e5%9e%8b%e4%b8%8e%e7%bd%91%e7%bb%9c%e6%a0%88%ef%bc%9ataskmanager-%e7%9a%84%e5%86%85%e5%ad%98%e6%98%af%e5%a6%82%e4%bd%95%e5%88%86%e9%85%8d%e7%9a%84%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/121712.html","title":{"rendered":"Flink \u5185\u5b58\u6a21\u578b\u4e0e\u7f51\u7edc\u6808\uff1aTaskManager \u7684\u5185\u5b58\u662f\u5982\u4f55\u5206\u914d\u7684\uff1f"},"content":{"rendered":"<h2>Flink \u5185\u5b58\u6a21\u578b\u4e0e\u7f51\u7edc\u6808&#xff1a;TaskManager \u7684\u5185\u5b58\u662f\u5982\u4f55\u5206\u914d\u7684&#xff1f;<\/h2>\n<p>\u8c03\u5927 taskmanager.memory.process.size \u4e4b\u540e\u4f5c\u4e1a\u53cd\u800c\u88ab OOMKilled&#xff0c;\u5806\u5185\u5b58\u660e\u660e\u8fd8\u6709\u5bcc\u4f59\u5374\u62a5\u4e86 Direct buffer memory\u2014\u2014\u8fd9\u7c7b\u95ee\u9898\u7684\u6839\u6e90\u5728\u4e8e\u4e00\u4e2a\u5bb9\u6613\u88ab\u5ffd\u7565\u7684\u4e8b\u5b9e&#xff1a;\u4f60\u914d\u7f6e\u7684\u5185\u5b58\u5927\u5c0f&#xff0c;\u4e0d\u7b49\u4e8e JVM \u5b9e\u9645\u4f1a\u4f7f\u7528\u7684\u5185\u5b58\u5927\u5c0f\u3002Flink \u7684\u5185\u5b58\u6a21\u578b\u662f\u4e00\u5957\u5206\u5c42\u9884\u7b97 &#043; \u52a8\u6001\u6c34\u4f4d\u7cfb\u7edf&#xff1a;Managed Memory \u7684\u7528\u91cf\u7531 RocksDB \u7684 Block Cache \u547d\u4e2d\u7387\u548c Write Buffer \u51b2\u5237\u9891\u7387\u95f4\u63a5\u51b3\u5b9a&#xff0c;Network Memory \u7684\u6d88\u8017\u53d6\u51b3\u4e8e\u201c\u901a\u9053\u6570 \u00d7 \u6bcf\u901a\u9053\u7f13\u51b2\u6570\u201d&#xff0c;\u800c JVM \u81ea\u8eab\u7684 native \u5f00\u9500\u6839\u672c\u4e0d\u5728 Flink \u7684\u53c2\u6570\u8868\u91cc\u3002\u8fd9\u7bc7\u6587\u7ae0\u5c06\u62c6\u89e3\u8fd9\u5957\u9884\u7b97\u673a\u5236\u7684\u771f\u5b9e\u884c\u4e3a&#xff0c;\u7528 Little\u2019s Law \u548c Amdahl \u5b9a\u5f8b\u628a\u201c\u8c03\u5185\u5b58\u201d\u4ece\u7384\u5b66\u53d8\u6210\u7b97\u672f\u2014\u2014\u672c\u6587\u6240\u6709\u7b97\u4f8b\u7684\u6570\u5b57\u90fd\u7ed9\u51fa\u63a8\u5bfc\u8fc7\u7a0b&#xff0c;\u8bfb\u8005\u53ef\u4ee5\u9010\u884c\u590d\u7b97\u2014\u2014\u5e76\u7528\u4e00\u4e2a\u771f\u6b63\u6d88\u8017 Managed Memory \u7684 Scala \u4f5c\u4e1a\u89c2\u5bdf\u5185\u5b58\u4e0e\u7f51\u7edc\u6307\u6807\u7684\u5b9e\u9645\u6c34\u4f4d\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/11\/20261103041643-6ae9602b65b36.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>\u5f15\u8a00&#xff1a;\u914d\u7f6e\u7684\u201c\u503c\u201d\u4e0e\u8fd0\u884c\u7684\u201c\u8d26\u201d<\/h3>\n<p>\u4e00\u4e2a\u771f\u5b9e\u7684\u6392\u969c\u573a\u666f&#xff1a;TaskManager \u914d\u7f6e\u4e86 process.size: 8g&#xff0c;\u5bb9\u5668\u5185\u5b58\u9650\u5236 8g&#xff0c;\u8fd0\u884c\u4e00\u6bb5\u65f6\u95f4\u540e\u88ab K8s OOMKilled\u3002jmap -heap \u663e\u793a\u5806\u4f7f\u7528\u7387\u53ea\u6709 40%\u2014\u2014\u770b\u8d77\u6765\u5806\u5185\u5b58\u5145\u8db3&#xff0c;\u4f46\u8fdb\u7a0b\u603b RSS \u5df2\u7ecf\u903c\u8fd1\u9650\u5236\u3002<br \/>\n\u95ee\u9898\u51fa\u5728\u5806\u5916\u3002Flink \u7684\u5806\u5916\u5185\u5b58\u7531\u4e09\u4e2a\u4e92\u4e0d\u96b6\u5c5e\u7684\u90e8\u5206\u7ec4\u6210&#xff1a;Managed Memory&#xff08;Flink \u7edf\u4e00\u7ba1\u7406&#xff0c;\u4ea4\u7ed9 RocksDB \u6216\u6279\u7b97\u5b50&#xff09;\u3001Network Memory&#xff08;\u7f51\u7edc\u7f13\u51b2\u6c60&#xff09;\u3001\u4ee5\u53ca JVM \u81ea\u8eab\u7684 native \u5f00\u9500&#xff08;\u7ebf\u7a0b\u6808\u3001Metaspace\u3001DirectByteBuffer\u3001JNI\u3001GC \u5185\u90e8\u7ed3\u6784&#xff09;\u3002\u524d\u4e24\u8005\u5728 Flink \u7684\u53c2\u6570\u4f53\u7cfb\u91cc\u6709\u660e\u786e\u7684\u4e0a\u754c&#xff1b;\u7b2c\u4e09\u8005\u53ea\u5728 taskmanager.memory.process.size \u91cc\u901a\u8fc7 JVM Overhead \u9884\u7559\u4e86\u4e00\u4e2a\u6bd4\u4f8b&#xff08;\u9ed8\u8ba4 fraction 0.1&#xff0c;min 192MB&#xff0c;max 1GB&#xff09;\u3002\u4e00\u65e6 JNI \u8c03\u7528\u3001Netty \u76f4\u63a5\u7f13\u51b2\u6216\u7b2c\u4e09\u65b9 SDK \u7684 native \u5206\u914d\u8d85\u51fa\u8fd9\u4e2a\u9884\u7559&#xff0c;\u8fdb\u7a0b RSS \u5c31\u4f1a\u7a81\u7834 Flink \u7684\u9884\u7b97\u8fb9\u754c&#xff0c;\u89e6\u53d1\u5bb9\u5668\u7ea7 OOMKill\u2014\u2014\u800c\u8fd9\u65f6\u5806\u5185\u5b58\u53ef\u80fd\u8fd8\u5f88\u7a7a\u95f2\u3002<br \/>\n\u672c\u6587\u7684\u8def\u7ebf&#xff1a;\u5148\u628a\u201c\u8fdb\u7a0b\u7684\u4e24\u672c\u8d26\u201d\u548c\u4e24\u4e2a\u7406\u8bba\u6a21\u578b\u7acb\u8d77\u6765&#xff08;\u7b2c 1 \u7ae0&#xff09;&#xff1b;\u518d\u9010\u533a\u62c6\u89e3\u9884\u7b97\u673a\u5236\u3001RocksDB \u6c34\u4f4d\u4e0e\u7f51\u7edc\u7f13\u51b2\u7b97\u672f&#xff08;\u7b2c 2 \u7ae0&#xff09;&#xff1b;\u7136\u540e\u7528\u5e26 RocksDB \u72b6\u6001\u7684 Scala \u4f5c\u4e1a\u8ba9\u5185\u5b58\u4e0e\u7f51\u7edc\u6c34\u4f4d\u771f\u6b63\u53ef\u89c1&#xff08;\u7b2c 3 \u7ae0&#xff09;&#xff1b;\u6700\u540e\u7ed9\u51fa OOM \u5206\u5c42\u8bca\u65ad\u6d41\u7a0b\u4e0e\u7f51\u7edc\u9884\u7b97\u4e0b\u7684\u5e76\u884c\u5ea6\u4e0a\u9650\u63a8\u5bfc&#xff08;\u7b2c 4 \u7ae0&#xff09;\u3002<\/p>\n<h3>\u4e00\u3001\u524d\u7f6e\u77e5\u8bc6&#xff1a;\u8fdb\u7a0b\u7684\u4e24\u672c\u8d26\u4e0e\u4e24\u4e2a\u7406\u8bba\u6a21\u578b<\/h3>\n<h4>1.1 \u4e24\u672c\u8d26&#xff1a;JVM \u89c6\u89d2 vs \u8fdb\u7a0b\u89c6\u89d2<\/h4>\n<p>\u6392\u67e5\u5185\u5b58\u95ee\u9898\u7684\u7b2c\u4e00\u6b65&#xff0c;\u662f\u627f\u8ba4 JVM \u7684\u8d26\u672c\u548c\u64cd\u4f5c\u7cfb\u7edf\u7684\u8d26\u672c\u5bf9\u4e0d\u4e0a&#xff1a;<\/p>\n<ul>\n<li>JVM \u7684\u8d26&#xff1a;\u5806&#xff08;-Xmx&#xff09;\u3001Metaspace\u3001\u76f4\u63a5\u5185\u5b58&#xff08;-XX:MaxDirectMemorySize&#xff09;\u3001\u7ebf\u7a0b\u6808\u3002jmap\u3001jstat \u770b\u5230\u7684\u662f\u8fd9\u672c\u8d26\u3002<\/li>\n<li>\u8fdb\u7a0b\u7684\u8d26&#xff08;RSS&#xff09;&#xff1a;\u4ee5\u4e0a\u5168\u90e8&#xff0c;\u52a0\u4e0a JVM \u8fd0\u884c\u65f6\u7684 native \u7ed3\u6784\u2014\u2014GC \u5185\u90e8\u6570\u636e&#xff08;G1 \u7684\u8bb0\u5fc6\u96c6\/\u5361\u8868&#xff09;\u3001JIT \u7f16\u8bd1\u540e\u7684\u4ee3\u7801\u7f13\u5b58\u3001glibc \u7684 malloc \u788e\u7247\u3001JNI \u5e93&#xff08;RocksDB \u5728\u5173\u95ed\u6258\u7ba1\u5185\u5b58\u65f6&#xff09;\u5206\u914d\u7684 C&#043;&#043; \u5806\u3002pmap -x &lt;pid&gt;\u3001K8s cgroup \u8ba1\u91cf\u7684\u662f\u8fd9\u672c\u8d26\u3002<br \/>\n\u5bb9\u5668 OOMKill \u5224\u5b9a\u7528\u7684\u662f\u7b2c\u4e8c\u672c\u8d26&#xff0c;\u800c Flink \u7684\u53c2\u6570\u4f53\u7cfb\u53ea\u80fd\u7cbe\u786e\u63a7\u5236\u7b2c\u4e00\u672c\u8d26\u7684\u5927\u90e8\u5206\u2014\u2014\u4e24\u8005\u7684\u5dee\u989d\u5c31\u662f JVM Overhead \u9884\u7559\u5b58\u5728\u7684\u539f\u56e0\u3002\u7406\u89e3\u201c\u4e24\u672c\u8d26\u201d\u662f\u540e\u9762\u4e00\u5207\u8bca\u65ad\u7684\u5730\u57fa&#xff1a;\u5806\u7a7a\u95f2 &#043; OOMKilled&#xff0c;\u51e0\u4e4e\u5fc5\u7136\u610f\u5473\u7740\u5dee\u989d\u51fa\u5728 native \u4fa7\u3002<\/li>\n<\/ul>\n<h4>1.2 \u4e24\u4e2a\u8d2f\u7a7f\u5168\u6587\u7684\u7406\u8bba\u6a21\u578b<\/h4>\n<p>\u540e\u9762\u6240\u6709\u201c\u8be5\u8c03\u54ea\u4e2a\u53c2\u6570\u201d\u7684\u5224\u65ad&#xff0c;\u90fd\u53ef\u4ee5\u5f52\u7ed3\u4e3a\u4e24\u4e2a\u6a21\u578b&#xff1a;<br \/>\n\u6a21\u578b\u4e00&#xff1a;Little\u2019s Law&#xff08;L &#061; \u03bbW&#xff09;\u3002\u7cfb\u7edf\u4e2d\u7684\u5e73\u5747\u6ede\u7559\u91cf &#061; \u5230\u8fbe\u901f\u7387 \u00d7 \u5e73\u5747\u6ede\u7559\u65f6\u95f4\u3002\u5b83\u662f\u6392\u961f\u8bba\u6700\u57fa\u672c\u7684\u6052\u7b49\u5f0f&#xff0c;\u5728\u8fd9\u91cc\u6709\u4e24\u4e2a\u5316\u8eab&#xff1a;<\/p>\n<ul>\n<li>\u7f51\u7edc\u5316\u8eab&#xff08;BDP&#xff0c;\u5e26\u5bbd\u65f6\u5ef6\u79ef&#xff09;&#xff1a;\u901a\u9053\u4e0a\u9700\u8981\u7ef4\u6301\u7684 in-flight \u6570\u636e\u91cf &#061; \u541e\u5410 \u00d7 \u5f80\u8fd4\u5ef6\u8fdf\u3002\u8981\u8ba9\u5355\u901a\u9053\u8dd1 100MB\/s\u3001credit \u901a\u544a RTT \u4e3a 20ms&#xff0c;\u901a\u9053\u4e0a\u5fc5\u987b\u5e38\u9a7b \u2265 100MB\/s \u00d7 20ms &#061; 2MB \u7684 in-flight \u6570\u636e\u2014\u2014\u8fd9\u5c31\u662f\u201c\u7ba1\u9053\u8981\u88c5\u6ee1\u201d\u7684\u5b9a\u91cf\u8868\u8fbe\u3002<\/li>\n<li>\u72b6\u6001\u5316\u8eab&#xff1a;RocksDB \u7684 Write Buffer \u603b\u91cf &#061; \u5199\u5165\u901f\u7387 \u00d7 Flush \u95f4\u9694\u7684\u5bb9\u5fcd\u503c&#xff1b;MemTable \u592a\u5c0f\u610f\u5473\u7740 Flush \u592a\u9891\u7e41&#xff08;\u5199\u653e\u5927&#xff09;&#xff0c;\u592a\u5927\u610f\u5473\u7740\u5185\u5b58\u88ab\u65e0\u6548\u5360\u7528\u3002<br \/>\n\u6a21\u578b\u4e8c&#xff1a;Amdahl \u5b9a\u5f8b\u3002\u52a0\u901f\u6bd4\u53d7\u4e32\u884c\u90e8\u5206\u9650\u5236&#xff1b;\u63a8\u5e7f\u5230\u8d44\u6e90\u7ef4\u5ea6\u2014\u2014\u5f53\u74f6\u9888\u662f\u8d44\u6e90\u603b\u91cf&#xff08;\u7f51\u7edc\u5185\u5b58\u3001\u5e8f\u5217\u5316 CPU \u7684\u6bcf\u5b57\u8282\u6210\u672c&#xff09;\u800c\u975e\u8ba1\u7b97\u5e76\u884c\u5ea6\u65f6&#xff0c;\u52a0\u5e76\u884c\u5ea6\u4e0d\u63d0\u5347\u541e\u5410&#xff0c;\u53ea\u4f1a\u7a00\u91ca\u8d44\u6e90&#xff1a;\u540c\u6837\u7684\u7f51\u7edc\u9884\u7b97\u88ab\u644a\u5230\u66f4\u591a\u901a\u9053\u4e0a&#xff0c;\u6bcf\u901a\u9053\u5206\u5230\u7684\u7f13\u51b2\u66f4\u5c11&#xff0c;\u5355\u901a\u9053 BDP \u9700\u6c42\u66f4\u96be\u6ee1\u8db3\u3002\u8fd9\u89e3\u91ca\u4e86\u672c\u6587\u53cd\u590d\u51fa\u73b0\u7684\u4e00\u4e2a\u53cd\u76f4\u89c9\u73b0\u8c61&#xff1a;\u52a0\u5e76\u884c\u5ea6\u6709\u65f6\u8ba9\u541e\u5410\u4e0d\u5347\u53cd\u964d\u2014\u2014\u7b2c 4 \u7ae0\u4f1a\u628a\u8fd9\u4e2a\u201c\u6709\u65f6\u201d\u91cf\u5316\u6210\u5177\u4f53\u7684\u6570\u5b57\u3002<\/li>\n<\/ul>\n<p>\u672c\u8282\u5c0f\u7ed3&#xff1a;JVM \u8d26\u4e0e\u8fdb\u7a0b\u8d26&#xff08;RSS&#xff09;\u5929\u7136\u5bf9\u4e0d\u9f50&#xff0c;\u5dee\u989d\u662f native \u7ed3\u6784\u2014\u2014\u8fd9\u662f JVM Overhead \u9884\u7559\u5b58\u5728\u7684\u539f\u56e0&#xff0c;\u4e5f\u662f\u5bb9\u5668 OOMKill \u7684\u4e3b\u6218\u573a\u3002Little\u2019s Law \u7ed9\u51fa\u201c\u541e\u5410 \u00d7 \u5ef6\u8fdf &#061; in-flight \u9700\u6c42\u201d\u7684\u9884\u7b97\u516c\u5f0f&#xff08;\u7f51\u7edc\u4e0a\u662f BDP&#xff0c;\u72b6\u6001\u4e0a\u662f Write Buffer&#xff09;&#xff0c;Amdahl \u5b9a\u5f8b\u89e3\u91ca\u8d44\u6e90\u578b\u74f6\u9888\u4e0b\u52a0\u5e76\u884c\u5ea6\u4e3a\u4f55\u65e0\u6548\u3002\u8bb0\u4f4f\u8fd9\u4e24\u4e2a\u6a21\u578b&#xff0c;\u540e\u9762\u7684\u6240\u6709\u7ed3\u8bba\u90fd\u662f\u7b97\u51fa\u6765\u7684\u3002<\/p>\n<h3>\u4e8c\u3001\u6838\u5fc3\u5256\u6790&#xff1a;\u5206\u533a\u9884\u7b97\u3001RocksDB \u6c34\u4f4d\u4e0e\u7f51\u7edc\u7f13\u51b2\u7b97\u672f<\/h3>\n<h4>2.1 \u7edf\u4e00\u5185\u5b58\u6a21\u578b&#xff1a;\u5148\u7ea0\u6b63\u4e00\u68f5\u5e38\u89c1\u7684\u9519\u6811<\/h4>\n<p>Flink 1.10 \u5f15\u5165\u7684\u7edf\u4e00\u5185\u5b58\u6a21\u578b&#xff08;FLIP-49&#xff09;\u5c06 TaskManager \u8fdb\u7a0b\u5185\u5b58\u5212\u5206\u5982\u4e0b&#xff1a;<\/p>\n<p>Total Process Memory (taskmanager.memory.process.size)<br \/>\n\u251c\u2500\u2500 Total Flink Memory<br \/>\n\u2502   \u251c\u2500\u2500 JVM Heap<br \/>\n\u2502   \u2502   \u251c\u2500\u2500 Framework Heap (\u9ed8\u8ba4 128MB)<br \/>\n\u2502   \u2502   \u2514\u2500\u2500 Task Heap (\u7528\u6237\u4ee3\u7801\u3001HashMapStateBackend \u7684\u72b6\u6001)<br \/>\n\u2502   \u2514\u2500\u2500 Off-Heap (\u53d7 -XX:MaxDirectMemorySize \u7ea6\u675f)<br \/>\n\u2502       \u251c\u2500\u2500 Managed Memory (\u9ed8\u8ba4 fraction 0.4)<br \/>\n\u2502       \u251c\u2500\u2500 Network Memory (\u9ed8\u8ba4 fraction 0.1&#xff0c;min 64MB&#xff0c;max 1GB)<br \/>\n\u2502       \u2514\u2500\u2500 Framework Off-Heap (128MB) &#043; Task Off-Heap (\u9ed8\u8ba4 0)<br \/>\n\u251c\u2500\u2500 JVM Metaspace (taskmanager.memory.jvm-metaspace.size&#xff0c;\u9ed8\u8ba4 256MB)  \u2190 \u4e0e Overhead \u5e76\u5217<br \/>\n\u2514\u2500\u2500 JVM Overhead (fraction 0.1&#xff0c;min 192MB&#xff0c;max 1GB)                    \u2190 \u7ebf\u7a0b\u6808\/GC\/JIT\/native<\/p>\n<p>\u4e00\u4e2a\u9ad8\u9891\u9519\u8bef\u662f\u628a Metaspace \u753b\u8fdb JVM Overhead \u91cc\u2014\u2014\u6b63\u786e\u7684\u5173\u7cfb\u662f\u5e76\u5217&#xff1a;Metaspace \u6709\u81ea\u5df1\u72ec\u7acb\u7684\u914d\u7f6e\u9879\u548c\u9ed8\u8ba4\u503c&#xff08;256MB&#xff09;&#xff0c;Overhead \u8986\u76d6\u7684\u662f\u7ebf\u7a0b\u6808\u3001GC \u7ed3\u6784\u3001JIT \u4ee3\u7801\u7f13\u5b58\u3001JNI \u7b49\u66f4\u96be\u9884\u6d4b\u7684\u90e8\u5206\u3002<br \/>\n\u5404\u533a\u57df\u7684\u804c\u8d23\u4e0e\u6d88\u8017\u65b9&#xff1a;<\/p>\n<table>\n<tr>\u533a\u57df\u88c5\u4ec0\u4e48\u8c01\u5728\u6d88\u8017\u9ed8\u8ba4\u503c<\/tr>\n<tbody>\n<tr>\n<td>Managed Memory<\/td>\n<td>RocksDB \u7684 Block Cache \/ Write Buffer \/ \u7d22\u5f15\u8fc7\u6ee4\u5668&#xff1b;\u6279\u7b97\u5b50\u7684\u6392\u5e8f\u4e0e\u54c8\u5e0c\u8868<\/td>\n<td>RocksDB \u6216\u6279\u7b97\u5b50\u6309\u6c34\u4f4d\u52a8\u6001\u5360\u7528<\/td>\n<td>Total Flink \u7684 0.4<\/td>\n<\/tr>\n<tr>\n<td>Network Memory<\/td>\n<td>\u7b97\u5b50\u95f4 Shuffle \u7684 in-flight \u7f13\u51b2<\/td>\n<td>\u901a\u9053\u6570 \u00d7 \u6bcf\u901a\u9053\u7f13\u51b2\u6570<\/td>\n<td>0.1&#xff0c;min 64MB&#xff0c;max 1GB<\/td>\n<\/tr>\n<tr>\n<td>Framework\/Task Off-Heap<\/td>\n<td>\u6846\u67b6\u4e0e\u7528\u6237\u4ee3\u7801\u7684 DirectByteBuffer<\/td>\n<td>\u6846\u67b6&#xff08;Netty \u5143\u6570\u636e\u7b49&#xff09;\u4e0e\u7528\u6237\u4ee3\u7801<\/td>\n<td>\u5404 128MB \/ 0<\/td>\n<\/tr>\n<tr>\n<td>Task Heap<\/td>\n<td>\u7528\u6237\u5bf9\u8c61\u3001\u5806\u72b6\u6001\u540e\u7aef<\/td>\n<td>\u7528\u6237\u4ee3\u7801<\/td>\n<td>\u5269\u4f59\u90e8\u5206<\/td>\n<\/tr>\n<tr>\n<td>JVM Metaspace<\/td>\n<td>\u52a0\u8f7d\u7684\u7c7b\u5143\u6570\u636e<\/td>\n<td>\u7c7b\u52a0\u8f7d\u91cf<\/td>\n<td>256MB<\/td>\n<\/tr>\n<tr>\n<td>JVM Overhead<\/td>\n<td>\u7ebf\u7a0b\u6808\u3001GC\u3001JIT\u3001JNI<\/td>\n<td>JVM \u4e0e native \u4ee3\u7801<\/td>\n<td>Process \u7684 0.1<\/td>\n<\/tr>\n<tr>\n<td>\u4e3a\u4ec0\u4e48 Managed Memory \u9ed8\u8ba4\u662f 0.4&#xff1a;\u8fd9\u662f\u4e00\u4e2a\u5728\u201c\u6d41\u6279\u901a\u7528\u201d\u4e0e\u201c\u72b6\u6001\u6709\u65e0\u201d\u4e4b\u95f4\u53d6\u7684\u5e73\u8861\u503c\u2014\u2014Managed Memory \u540c\u65f6\u670d\u52a1\u4e24\u7c7b\u6d88\u8d39\u8005&#xff1a;RocksDB&#xff08;\u6d41\u4f5c\u4e1a&#xff09;\u548c\u6392\u5e8f\/\u54c8\u5e0c\u7b49\u6279\u7b97\u5b50&#xff0c;\u9ed8\u8ba4\u503c\u4e0d\u80fd\u53ea\u504f\u5411\u4e00\u7c7b\u3002\u843d\u5230\u5177\u4f53\u4f5c\u4e1a&#xff0c;\u6700\u4f18\u503c\u5dee\u5f02\u5f88\u5927&#xff1a;\u7eaf ETL \/ \u8f7b\u72b6\u6001\u4f5c\u4e1a\u53ef\u964d\u5230 0.1\u20130.2&#xff08;\u591a\u4f59\u7684\u914d\u989d\u4e0d\u4f1a\u81ea\u52a8\u8ba9\u7ed9\u5806&#xff0c;\u8c03\u4f4e\u540e Task Heap \u76f8\u5e94\u53d8\u5927&#xff09;&#xff1b;\u5927\u72b6\u6001 RocksDB \u4f5c\u4e1a\u5e94\u5347\u5230 0.6\u20130.7&#xff08;Block Cache \u547d\u4e2d\u7387\u5bf9\u8bfb\u6027\u80fd\u7684\u5f71\u54cd\u89c1 2.3&#xff09;\u3002\u6ce8\u610f\u4e0a\u8c03 managed.fraction \u4f1a\u6324\u538b Task Heap \u4e0e Network\u2014\u2014\u53c8\u4e00\u6b21&#xff0c;\u9884\u7b97\u7684\u5c40\u90e8\u8c03\u6574\u603b\u5728\u522b\u5904\u4ea7\u751f\u5bf9\u51b2\u3002<\/td>\n<td><\/td>\n<td><\/td>\n<td><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>2.2 \u6bd4\u4f8b\u8ba1\u7b97\u7684\u751f\u6548\u89c4\u5219&#xff1a;min\/max \u4f1a\u201c\u5403\u6389\u201d\u6bd4\u4f8b<\/h4>\n<p>\u4e00\u4e2a\u5bb9\u6613\u8e29\u7684\u914d\u7f6e\u9677\u9631&#xff1a;Network Memory \u7684\u5b9e\u9645\u503c\u4e0d\u662f\u7b80\u5355\u7684\u201cFlink Memory \u00d7 0.1\u201d&#xff0c;\u800c\u662f\u5148\u6309\u6bd4\u4f8b\u8ba1\u7b97&#xff0c;\u518d\u4e0e min\/max \u53d6\u4ea4\u96c6&#xff1b;\u82e5\u843d\u5230\u754c\u5916\u5219\u88ab\u62c9\u56de&#xff0c;\u800c\u62c9\u56de\u7684\u5dee\u989d\u4ece\u5176\u4ed6\u6309\u6bd4\u4f8b\u8ba1\u7b97\u7684\u533a\u57df\u91cc\u6263\u3002<br \/>\n\u4ee5 Total Flink Memory &#061; 4GB \u4e3a\u4f8b&#xff1a;\u6309 0.1 \u8ba1\u7b97 Network &#061; 409.6MB&#xff0c;\u843d\u5728 [64MB, 1GB] \u5185&#xff0c;\u53d6 409.6MB\u3002\u5982\u679c\u663e\u5f0f\u628a network.min \u8c03\u5230 512MB&#xff0c;\u6bd4\u4f8b\u8ba1\u7b97\u88ab\u8986\u76d6&#xff0c;Network \u53d6 512MB\u2014\u2014\u591a\u51fa\u7684\u7ea6 100MB \u4ece Managed Memory \u6216 Task Heap \u4e2d\u6263\u9664&#xff0c;\u56e0\u4e3a\u603b\u9884\u7b97\u4e0d\u53d8\u3002<br \/>\n\u8fd9\u610f\u5473\u7740&#xff1a;\u5728\u7f51\u7edc\u5bc6\u96c6\u4f5c\u4e1a\u4e2d\u8c03\u9ad8 network.min&#xff0c;Managed Memory \u7684\u4efd\u989d\u4f1a\u81ea\u52a8\u7f29\u5c0f&#xff0c;RocksDB \u7684 Block Cache \u968f\u4e4b\u53d8\u5c0f\u3001\u8bfb\u547d\u4e2d\u7387\u4e0b\u964d\u2014\u2014\u7f51\u7edc\u8c03\u4f18\u7684\u4ee3\u4ef7\u4ee5\u72b6\u6001\u8bfb\u6027\u80fd\u7684\u5f62\u5f0f\u8f6c\u79fb\u5230\u4e86\u53e6\u4e00\u4e2a\u533a\u57df\u3002\u9884\u7b97\u7cfb\u7edf\u7684\u6bcf\u4e00\u6b21\u5c40\u90e8\u8c03\u6574&#xff0c;\u90fd\u4f1a\u5728\u522b\u5904\u4ea7\u751f\u5bf9\u51b2\u3002<\/p>\n<h4>2.3 Managed Memory&#xff1a;RocksDB \u7684\u6c34\u4f4d\u518d\u5206\u914d<\/h4>\n<p>Managed Memory \u6700\u5bb9\u6613\u8bef\u89e3\u7684\u4e00\u70b9&#xff1a;\u5b83\u662f\u4e00\u5757\u914d\u989d&#xff0c;\u4f46 RocksDB \u4e0d\u4f1a\u542f\u52a8\u65f6\u5c31\u5360\u6ee1\u5b83\u3002\u5f00\u542f state.backend.rocksdb.memory.managed: true \u540e&#xff0c;Flink \u628a\u914d\u989d\u4ea4\u7ed9 RocksDB \u7684\u5171\u4eab\u5185\u5b58\u7ba1\u7406\u5668&#xff0c;\u518d\u7531\u4e24\u4e2a\u6bd4\u4f8b\u5728\u4e09\u4e2a\u6d88\u8d39\u8005\u4e4b\u95f4\u5207\u5206&#xff1a;<\/p>\n<ul>\n<li>state.backend.rocksdb.memory.write-buffer-ratio&#xff08;\u9ed8\u8ba4 0.5&#xff09;&#xff1a;50% \u7684\u914d\u989d\u7ed9 Write Buffer \u7ba1\u7406\u5668&#xff08;MemTable&#xff09;&#xff1b;<\/li>\n<li>state.backend.rocksdb.memory.high-prio-pool-ratio&#xff08;\u9ed8\u8ba4 0.1&#xff09;&#xff1a;Block Cache \u4e2d 10% \u4f5c\u4e3a\u9ad8\u4f18\u5148\u6c60&#xff0c;\u4e13\u4f9b\u7d22\u5f15\u548c Bloom Filter&#xff1b;<\/li>\n<li>\u5176\u4f59\u7ea6 40% \u4f5c\u4e3a\u6570\u636e\u5757\u7684 Block Cache\u3002<br \/>\n\u4e8e\u662f Managed Memory \u5185\u90e8\u7684\u8c03\u4f18\u5c31\u662f\u4e00\u5f20\u518d\u5206\u914d\u51b3\u7b56\u8868&#xff1a;<br \/>\n| \u75c7\u72b6 | \u6307\u5411\u7684\u5931\u8861 | \u8c03\u6574\u65b9\u5411 |<br \/>\n|\u2014|\u2014|\u2014|<br \/>\n| \u9891\u7e41 Flush\u3001Write Stall\u3001\u5199\u653e\u5927 | Write Buffer \u4e0d\u8db3 | writebuffer.size 64\u2192128\/256MB\u3001write-buffer-ratio \u4e0a\u8c03 |<br \/>\n| Block Cache \u547d\u4e2d\u7387 &lt; 90%\u3001\u70b9\u67e5\u53d8\u6162 | \u6570\u636e\u7f13\u5b58\u4e0d\u8db3 | write-buffer-ratio \u4e0b\u8c03&#xff08;\u5411 Cache \u503e\u659c&#xff09;\u3001\u5fc5\u8981\u65f6\u4e0a\u8c03 managed.fraction |<br \/>\n| \u7d22\u5f15\/\u8fc7\u6ee4\u5668\u672a\u547d\u4e2d | \u9ad8\u4f18\u5148\u6c60\u4e0d\u8db3 | high-prio-pool-ratio \u4e0a\u8c03&#xff08;\u9ed8\u8ba4 0.1&#xff09; |<br \/>\n\u4e00\u4e2a\u5178\u578b\u7684\u8c03\u4f18\u8def\u5f84&#xff08;\u63a8\u6f14\u793a\u4f8b&#xff0c;\u5047\u8bbe Checkpoint \u95f4\u9694\u4e3a\u5206\u949f\u7ea7&#xff1b;\u5b9e\u9645\u6536\u76ca\u53d6\u51b3\u4e8e\u95f4\u9694\u8bbe\u7f6e\u4e0e\u72b6\u6001\u540e\u7aef\u914d\u7f6e&#xff09;&#xff1a;<br \/>\n| \u6307\u6807 | \u8c03\u6574\u524d&#xff08;ratio 0.5, wb.size 64MB&#xff09; | \u8c03\u6574\u540e&#xff08;ratio 0.3, wb.size 256MB&#xff09; |<br \/>\n|\u2014|\u2014|\u2014|<br \/>\n| Flush \u9891\u7387&#xff08;\u6bcf\u5217\u65cf&#xff09; | \u6bcf\u5206\u949f\u591a\u6b21&#xff0c;\u5076\u53d1 Write Stall | \u6570\u5206\u949f\u4e00\u6b21&#xff0c;Stall \u6d88\u5931 |<br \/>\n| Block Cache \u547d\u4e2d\u7387 | 85% \u5de6\u53f3&#xff0c;\u70b9\u67e5\u5ef6\u8fdf\u6296\u52a8 | \u56de\u5230 92\u201395% |<br \/>\n| Checkpoint \u65f6\u957f | 120s \u91cf\u7ea7&#xff0c;\u5076\u53d1\u8d85\u65f6 | \u56de\u843d\u81f3 40s \u91cf\u7ea7 |<br \/>\n\u5173\u952e\u52a8\u4f5c\u4e0d\u662f\u201c\u8c03\u5927\u5185\u5b58\u201d&#xff0c;\u800c\u662f\u5728\u914d\u989d\u5185\u90e8\u628a\u6c34\u4f4d\u4ece\u5199\u8def\u5f84\u632a\u5230\u8bfb\u8def\u5f84\u2014\u2014\u603b\u91cf\u4e0d\u53d8&#xff0c;\u7ed3\u6784\u53d8\u4e86\u3002\u8fd9\u4e2a\u518d\u5206\u914d\u89c6\u89d2\u6bd4\u201c\u52a0\u5185\u5b58\u201d\u4fbf\u5b9c\u5f97\u591a&#xff0c;\u4e5f\u5e38\u88ab\u8df3\u8fc7\u3002<\/li>\n<\/ul>\n<h4>2.4 JVM Overhead&#xff1a;\u628a\u201c\u8d26\u5916\u8d26\u201d\u53d8\u6210\u201c\u4f30\u7b97\u8d26\u201d<\/h4>\n<p>\u4e0e\u5176\u5217\u4e3e native \u5f00\u9500\u7684\u79cd\u7c7b&#xff0c;\u4e0d\u5982\u7ed9\u4e00\u4e2a\u53ef\u6267\u884c\u7684\u4f30\u7b97\u6cd5&#xff1a;<\/p>\n<p>Overhead \u9700\u6c42 \u2248 \u7ebf\u7a0b\u6570 \u00d7 \u9ed8\u8ba4\u6808\u5927\u5c0f(\u7ea61MB\/\u7ebf\u7a0b, Linux x64 JVM \u9ed8\u8ba4)<br \/>\n             &#043; Metaspace \u5178\u578b\u503c(100\u2013300MB, \u4e0e\u7c7b\u52a0\u8f7d\u6570\u91cf\u76f8\u5173)<br \/>\n             &#043; GC \u7ed3\u6784(G1 \u5e38\u89c1 5%\u201310% \u7684\u5806)<br \/>\n             &#043; JIT \u4ee3\u7801\u7f13\u5b58(\u9ed8\u8ba4\u4e0a\u9650 240MB, \u5b9e\u9645\u5e38\u89c1 64\u2013128MB)<br \/>\n             &#043; \u7528\u6237\u4ee3\u7801\u7684 Direct\/Native(Netty \u6c60\u3001JNI SDK\u3001\u672a\u6258\u7ba1\u7684 RocksDB)<\/p>\n<p>\u7b97\u4f8b&#xff1a;4 slot \u7684 TM&#xff0c;\u6bcf subtask \u7ea6 5 \u7ebf\u7a0b&#xff08;\u4e1a\u52a1 &#043; \u5b9a\u65f6\u5668 &#043; \u7f51\u7edc&#xff09;\u2192 20 \u7ebf\u7a0b&#xff1b;\u6846\u67b6\u7ebf\u7a0b\u7ea6 30 \u2192 \u5408\u8ba1\u7ea6 50 \u7ebf\u7a0b \u00d7 1MB &#061; 50MB&#xff1b;Metaspace \u6309 256MB&#xff1b;GC\/JIT \u7ea6 150MB&#xff1b;\u5408\u8ba1\u7ea6 456MB&#xff0c;\u52a0\u4e0a Netty Direct \u4e0e\u6742\u9879\u7ea6 500MB\u3002\u5bf9\u7167\u9884\u7b97&#xff1a;process.size &#061; 2g \u65f6 Overhead &#061; 0.1 \u00d7 2g &#061; 204MB &lt; 500MB \u2192 \u5fc5\u7136\u8d85\u652f&#xff0c;RSS \u7a81\u7834\u5bb9\u5668\u9650\u5236\u53ea\u662f\u65f6\u95f4\u95ee\u9898&#xff1b;process.size &#061; 8g \u65f6 Overhead &#061; 819MB &gt; 500MB&#xff0c;\u5b89\u5168\u3002\u540c\u6837\u7684\u4f5c\u4e1a&#xff0c;\u5c0f TM \u88ab OOMKill \u800c\u5927 TM \u76f8\u5b89\u65e0\u4e8b&#xff0c;\u6839\u6e90\u5e38\u5e38\u4e0d\u662f\u5185\u5b58\u4e0d\u591f&#xff0c;\u800c\u662f Overhead \u7684\u7edd\u5bf9\u503c\u4e0b\u9650\u88ab\u5c0f\u6bd4\u4f8b\u538b\u7f29\u4e86\u2014\u2014\u8fd9\u4e5f\u662f jvm-overhead.min \u5b58\u5728\u7684\u610f\u4e49\u3002<br \/>\n\u5bf9\u8d26\u4e0e\u8bca\u65ad\u547d\u4ee4&#xff1a;<\/p>\n<p>kubectl <span class=\"token function\">top<\/span> pod <span class=\"token operator\">&lt;<\/span>pod<span class=\"token operator\">&gt;<\/span>                    <span class=\"token comment\"># \u5bb9\u5668 RSS&#xff08;\u7b2c\u4e8c\u672c\u8d26&#xff09;<\/span><br \/>\njcmd <span class=\"token operator\">&lt;<\/span>pid<span class=\"token operator\">&gt;<\/span> VM.native_memory summary      <span class=\"token comment\"># NMT \u89c6\u89d2&#xff08;\u9700 -XX:NativeMemoryTracking&#061;summary&#xff09;<\/span><br \/>\npmap <span class=\"token parameter variable\">-x<\/span> <span class=\"token operator\">&lt;<\/span>pid<span class=\"token operator\">&gt;<\/span> <span class=\"token operator\">|<\/span> <span class=\"token function\">tail<\/span> <span class=\"token parameter variable\">-1<\/span>                  <span class=\"token comment\"># \u8fdb\u7a0b RSS \u4e0e anon \u6bb5\u6c47\u603b<\/span><\/p>\n<h4>2.5 \u7f51\u7edc\u6808&#xff1a;Credit \u6d41\u63a7\u3001\u7f13\u51b2\u751f\u547d\u5468\u671f\u4e0e\u901a\u9053\u6570\u7b97\u672f<\/h4>\n<p>Credit \u6d41\u63a7\u7684\u672c\u8d28\u662f\u628a\u53cd\u538b\u7c92\u5ea6\u4ece\u201c\u8fde\u63a5\u7ea7\u201d\u4e0b\u6c89\u5230\u201c\u901a\u9053\u7ea7\u201d&#xff1a;\u63a5\u6536\u65b9\u6309\u901a\u9053\u901a\u544a\u53ef\u7528\u7f13\u51b2\u6570&#xff08;1 buffer &#061; 1 credit&#xff09;&#xff0c;\u53d1\u9001\u65b9\u6bcf\u53d1\u4e00\u4e2a buffer \u6d88\u8017\u4e00\u4e2a credit&#xff0c;credit \u5f52\u96f6\u65f6\u53ea\u505c\u8be5\u901a\u9053&#xff0c;\u4e0d\u5f71\u54cd\u540c\u4e00 TCP \u8fde\u63a5\u4e0a\u7684\u5176\u4ed6\u901a\u9053\u3002\u652f\u6491 credit \u7684\u4e24\u7c7b\u7f13\u51b2&#xff1a;<\/p>\n<ul>\n<li>Exclusive buffers&#xff08;\u72ec\u5360&#xff09;&#xff1a;\u6bcf\u4e2a\u8fdc\u7a0b\u8f93\u5165\u901a\u9053\u521d\u59cb\u5316\u5373\u6301\u6709&#xff0c;\u7531 taskmanager.network.memory.buffers-per-channel \u63a7\u5236&#xff0c;\u9ed8\u8ba4 2\u3002\u4f5c\u7528\u662f\u201c\u4fdd\u5e95\u201d\u2014\u2014\u5728 credit \u901a\u544a\u5f80\u8fd4\u671f\u95f4\u7ef4\u6301\u57fa\u672c\u541e\u5410&#xff1b;<\/li>\n<li>Floating buffers&#xff08;\u6d6e\u52a8&#xff09;&#xff1a;\u6bcf\u4e2a\u8f93\u5165\u95e8&#xff08;gate&#xff09;\u5171\u4eab&#xff0c;\u7531 floating-buffers-per-gate \u63a7\u5236&#xff0c;\u9ed8\u8ba4 8&#xff0c;\u7528\u4e8e\u5438\u6536\u7a81\u53d1\u3002<br \/>\n\u7f13\u51b2\u751f\u547d\u5468\u671f&#xff1a;\u4ece\u53d1\u9001\u65b9\u7684\u8f93\u51fa\u6c60\u7533\u8bf7 \u2192 \u7ecf\u7f51\u7edc&#xff08;\u6216\u672c\u5730\u76f4\u901a&#xff09;\u5230\u8fbe\u63a5\u6536\u65b9 \u2192 \u88ab\u6d88\u8d39\u5b8c\u6700\u540e\u4e00\u4e2a\u8bb0\u5f55\u540e\u91ca\u653e \u2192 credit \u901a\u544a\u56de\u6d41\u3002\u4efb\u4f55\u4e00\u6b65\u53d8\u6162&#xff0c;\u7f13\u51b2\u5c31\u5728\u90a3\u4e00\u6b65\u5806\u79ef\u2014\u2014\u8fd9\u5c31\u662f outPoolUsage \/ inPoolUsage \u4e24\u4e2a\u6307\u6807\u80fd\u5b9a\u4f4d\u95ee\u9898\u7684\u539f\u7406\u3002<br \/>\nLittle\u2019s Law \u843d\u5230\u7f51\u7edc\u4e0a&#xff08;BDP \u7b97\u4f8b&#xff09;&#xff1a;RTT 20ms\u3001\u72ec\u5360\u7f13\u51b2 2 \u00d7 32KB &#061; 64KB&#xff0c;\u5219\u5355\u901a\u9053 credit \u5468\u671f\u5185\u7684\u541e\u5410\u4e0a\u9650 \u2248 64KB \/ 20ms &#061; 3.2MB\/s\u3002\u8981\u8ba9\u5355\u901a\u9053\u8dd1 100MB\/s&#xff0c;\u9700\u8981 in-flight \u2265 100MB\/s \u00d7 20ms &#061; 2MB&#xff0c;\u5373\u7ea6 64 \u4e2a buffer\/\u901a\u9053\u2014\u2014\u9ed8\u8ba4\u7684 2 \u4e2a\u5dee\u4e86 32 \u500d\u3002\u8fd9\u5c31\u662f\u201c\u7ba1\u9053\u6ca1\u88c5\u6ee1\u201d\u7684\u5b9a\u91cf\u542b\u4e49\u3002<br \/>\n\u901a\u9053\u6570\u7b97\u672f&#xff1a;all-to-all \u8fde\u63a5&#xff08;KeyBy\/Rebalance&#xff09;\u4e0b&#xff0c;\u6bcf\u4e2a\u4e0b\u6e38 subtask \u7684\u8f93\u5165\u901a\u9053\u6570 &#061; \u4e0a\u6e38\u5e76\u884c\u5ea6\u3002\u8bbe TM \u4e0a\u6709 S \u4e2a subtask&#xff08;slot \u6570&#xff09;\u3001\u6bcf\u4e2a subtask \u4e00\u4e2a\u8f93\u5165 gate\u3001\u4e0a\u6e38\u5e76\u884c\u5ea6 p&#xff0c;\u5219&#xff1a;<\/li>\n<\/ul>\n<p>\u6bcf TM \u7684 Network \u9700\u6c42 \u2248 S \u00d7 (p \u00d7 buffers-per-channel &#043; floating-buffers-per-gate) \u00d7 32KB<\/p>\n<p>\u6ce8\u610f\u516c\u5f0f\u7ed3\u6784&#xff1a;bpc \u90a3\u4e00\u9879\u4e58 p&#xff0c;floating \u90a3\u4e00\u9879\u4e0d\u4e58\u2014\u2014\u8fd9\u4e2a\u533a\u522b\u5728 4.2 \u8282\u89e3\u4e0d\u7b49\u5f0f\u65f6\u81f3\u5173\u91cd\u8981\u3002<br \/>\n\u7b97\u4f8b&#xff08;\u9ed8\u8ba4\u7f13\u51b2&#xff0c;p &#061; 200&#xff0c;S &#061; 8&#xff09;&#xff1a;\u6bcf gate (200 \u00d7 2 &#043; 8) &#061; 408 buffers \u00d7 32KB \u2248 13MB&#xff1b;8 \u4e2a gate \u5408\u8ba1 \u2248 104MB\u2014\u2014\u5728 1GB \u4e0a\u9650\u5185\u5f88\u5bbd\u88d5\u3002\u4f46\u82e5\u4e3a\u4e86\u6ee1\u8db3 BDP \u628a buffers-per-channel \u63d0\u5230 64&#xff1a;\u6bcf gate (200 \u00d7 64 &#043; 8) &#061; 12,808 buffers \u00d7 32KB \u2248 400MB&#xff0c;8 \u4e2a gate \u5408\u8ba1 \u7ea6 3.2GB&#xff0c;\u76f4\u63a5\u7206\u6389 1GB \u4e0a\u9650\u2014\u2014\u7f13\u51b2\u6c60\u88ab\u538b\u7f29&#xff0c;\u6bcf\u4e2a\u901a\u9053\u53cd\u800c\u5206\u4e0d\u5230\u8db3\u591f credit&#xff0c;\u541e\u5410\u4e0d\u5347\u53cd\u964d\u3002BDP \u8c03\u4f18\u4e0e\u5185\u5b58\u9884\u7b97\u662f\u4e00\u5bf9\u9700\u8981\u8054\u7acb\u6c42\u89e3\u7684\u7ea6\u675f&#xff1a;\u8c03\u5927\u6bcf\u901a\u9053\u7f13\u51b2\u7684\u540c\u65f6&#xff0c;\u5fc5\u987b\u6838\u7b97\u603b\u91cf\u5e76\u540c\u6b65\u4e0a\u8c03 network.fraction\/max\u3002<br \/>\n\u6307\u6807\u5224\u8bfb\u77e9\u9635&#xff08;\u6ce8\u610f&#xff1a;inPoolUsage \u6307\u8be5\u4efb\u52a1\u81ea\u8eab\u8f93\u5165\u4fa7\u3001outPoolUsage \u6307\u5176\u8f93\u51fa\u4fa7&#xff1b;\u8fdc\u7a0b\u8f93\u5165\u901a\u9053\u624d\u8ba1\u5165 inPoolUsage&#xff0c;local \u901a\u9053\u88ab\u5ffd\u7565&#xff09;&#xff1a;<\/p>\n<table>\n<tr>\u7ec4\u5408&#xff08;\u540c\u4e00\u6216\u76f8\u90bb\u4efb\u52a1&#xff09;\u542b\u4e49\u52a8\u4f5c<\/tr>\n<tbody>\n<tr>\n<td>\u53d1\u9001\u65b9 outPoolUsage \u9ad8 &#043; \u63a5\u6536\u65b9 inPoolUsage \u4f4e<\/td>\n<td>credit \u901a\u544a RTT \u76f8\u5bf9\u72ec\u5360\u7f13\u51b2\u6570\u8fc7\u9ad8&#xff0c;\u7ba1\u9053\u672a\u88c5\u6ee1&#xff08;BDP \u4e0d\u8db3&#xff0c;\u975e\u53cd\u538b&#xff09;<\/td>\n<td>\u589e\u5927 buffers-per-channel&#xff0c;\u540c\u65f6\u6838\u7b97 Network \u603b\u91cf<\/td>\n<\/tr>\n<tr>\n<td>outPoolUsage \u9ad8 &#043; inPoolUsage \u9ad8<\/td>\n<td>\u63a5\u6536\u65b9\u6d88\u8d39\u6162&#xff0c;credit \u56de\u6536\u6162\u2014\u2014\u771f\u5b9e\u53cd\u538b<\/td>\n<td>\u67e5\u4e0b\u6e38 busyTime\/\u74f6\u9888<\/td>\n<\/tr>\n<tr>\n<td>\u4e24\u8005\u90fd\u4f4e<\/td>\n<td>\u53d1\u9001\u901f\u7387\u53d7\u9650\u4e8e\u4e0a\u6e38\u6216 Source<\/td>\n<td>\u67e5 Source \u901f\u7387<\/td>\n<\/tr>\n<tr>\n<td>inPoolUsage \u9ad8\u3001outPoolUsage \u4f4e<\/td>\n<td>\u8be5\u4efb\u52a1\u81ea\u8eab\u6d88\u8d39\u6162&#xff0c;\u5373\u5c06\u5411\u4e0a\u6e38\u65bd\u538b<\/td>\n<td>\u67e5\u8be5\u4efb\u52a1\u7684 busy\/GC<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>2.6 \u9690\u5f62\u4e58\u6570&#xff1a;\u5e8f\u5217\u5316\u4e0e\u6570\u636e\u4ea4\u6362\u6a21\u5f0f<\/h4>\n<p>\u5e8f\u5217\u5316\u7684\u4e58\u6570\u6548\u5e94&#xff1a;\u6bcf\u8bb0\u5f55\u5e8f\u5217\u5316\u5b57\u8282\u6570 \u00d7 \u541e\u5410 &#061; \u7f51\u7edc\u5e26\u5bbd\u5360\u7528&#xff1b;\u5e8f\u5217\u5316\u4f53\u79ef\u540c\u65f6\u653e\u5927 Network \u7684 in-flight \u5b57\u8282\u4e0e RocksDB \u7684 SST \u4f53\u79ef\u3002\u4e00\u4e2a\u5e8f\u5217\u5316\u9009\u62e9\u9519\u8bef&#xff0c;\u4f1a\u540c\u65f6\u8868\u73b0\u4e3a CPU \u6253\u6ee1&#xff08;\u5e8f\u5217\u5316\u5f00\u9500&#xff09;\u3001\u7f51\u7edc\u7f13\u51b2\u66f4\u5feb\u8017\u5c3d\u3001RocksDB \u5199\u653e\u5927\u4e0a\u5347\u2014\u2014\u4e09\u5904\u75c7\u72b6&#xff0c;\u4e00\u4e2a\u6839\u56e0\u3002<br \/>\n\u6027\u80fd\u9636\u68af&#xff08;\u76f8\u5bf9\u5173\u7cfb\u6765\u81ea\u5b98\u65b9\u57fa\u51c6&#xff0c;\u7edd\u5bf9\u503c\u53d6\u51b3\u4e8e\u5bf9\u8c61\u7ed3\u6784&#xff0c;\u52ff\u76f4\u63a5\u5f15\u7528\u4e3a\u901a\u7528\u6570\u5b57&#xff09;&#xff1a;<\/p>\n<table>\n<tr>\u6846\u67b6\u76f8\u5bf9\u6027\u80fd\u9002\u7528\u98ce\u9669<\/tr>\n<tbody>\n<tr>\n<td>Tuple \/ Row<\/td>\n<td>\u6700\u5feb&#xff08;Tuple \u6bd4 POJO \u5feb\u7ea6 42%&#xff09;<\/td>\n<td>\u7b80\u5355\u7ed3\u6784\u3001\u4e2d\u95f4\u7ed3\u679c<\/td>\n<td>\u53ef\u8bfb\u6027\u5dee<\/td>\n<\/tr>\n<tr>\n<td>Scala case class&#xff08;Scala API \u4e0b&#xff09;<\/td>\n<td>\u63a5\u8fd1 Tuple&#xff08;\u5b57\u6bb5\u8bbf\u95ee\u6709\u5c11\u91cf\u5f00\u9500&#xff09;\u3001\u8fdc\u4f18\u4e8e Kryo\u2014\u2014Flink \u4e13\u7528\u7ec4\u5408\u5e8f\u5217\u5316\u5668<\/td>\n<td>Scala \u4f5c\u4e1a\u9ed8\u8ba4\u9009\u62e9<\/td>\n<td>\u65e0 Kryo \u56de\u9000\u98ce\u9669<\/td>\n<\/tr>\n<tr>\n<td>POJO<\/td>\n<td>\u57fa\u51c6\u7ebf<\/td>\n<td>\u516c\u5f00\u7c7b\u3001\u65e0\u53c2\u6784\u9020\u3001\u5b57\u6bb5\u53ef\u8fbe<\/td>\n<td>\u4e0d\u6ee1\u8db3\u89c4\u5219\u65f6\u56de\u9000 Kryo<\/td>\n<\/tr>\n<tr>\n<td>Kryo&#xff08;\u6ce8\u518c\u7c7b\u578b\u540e&#xff09;<\/td>\n<td>\u6bd4 POJO \u4f4e\u7ea6 64% \u541e\u5410<\/td>\n<td>\u515c\u5e95<\/td>\n<td>\u672a\u6ce8\u518c\u65f6\u518d\u964d\u4e00\u622a<\/td>\n<\/tr>\n<tr>\n<td>Kryo&#xff08;\u9ed8\u8ba4\/\u672a\u6ce8\u518c&#xff09;<\/td>\n<td>\u6bd4 POJO \u4f4e\u7ea6 75%<\/td>\n<td>\u515c\u5e95<\/td>\n<td>\u6bcf\u6761\u8bb0\u5f55\u643a\u5e26\u5b8c\u6574\u7c7b\u540d<\/td>\n<\/tr>\n<tr>\n<td>\u5fc5\u987b\u7ea0\u6b63\u7684\u4e00\u4e2a\u6d41\u4f20\u751a\u5e7f\u7684\u8bf4\u6cd5&#xff1a;Scala API \u4e0b case class \u4e0d\u4f1a\u8d70 Kryo\u2014\u2014\u5b83\u7531 Flink \u7684\u4e13\u7528\u5e8f\u5217\u5316\u5668&#xff08;ScalaCaseClassSerializer&#xff09;\u5904\u7406&#xff0c;\u5c5e\u4e8e\u7ec4\u5408\u7c7b\u578b\u5e8f\u5217\u5316\u8def\u5f84\u3002\u771f\u6b63\u7684 Kryo \u56de\u9000\u98ce\u9669\u5728&#xff1a;Java API \u4e0b\u64cd\u4f5c Scala \u7f16\u8bd1\u4ea7\u7269\u3001\u666e\u901a class \u8fdd\u53cd POJO \u89c4\u5219&#xff08;\u975e public\u3001\u7f3a\u65e0\u53c2\u6784\u9020\u3001\u5b57\u6bb5\u65e0 getter\/setter&#xff09;\u3001Row \u672a\u663e\u5f0f\u63d0\u4f9b TypeInformation\u3001\u590d\u6742\u6cdb\u578b\u63a8\u65ad\u5931\u8d25\u3002\u68c0\u6d4b\u56de\u9000\u7684\u53ef\u9760\u624b\u6bb5\u4e0d\u662f\u6253\u65ad\u70b9&#xff0c;\u800c\u662f\u770b\u65e5\u5fd7\u2014\u2014\u56de\u9000\u65f6 Flink \u4f1a\u6253\u5370&#xff1a;<\/td>\n<td><\/td>\n<td><\/td>\n<td><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Class &#8230; cannot be used as POJO type because not all fields are valid POJO fields,<br \/>\nand must be processed as GenericType.<\/p>\n<p>\u4e5f\u53ef\u4ee5\u7528 env.getConfig().disableGenericTypes() \u8ba9\u56de\u9000\u76f4\u63a5\u62a5\u9519&#xff0c;\u628a\u9759\u9ed8\u964d\u7ea7\u53d8\u6210\u663e\u5f0f\u5931\u8d25\u3002<br \/>\n\u6570\u636e\u4ea4\u6362\u6a21\u5f0f\u7684\u8fde\u63a5\u6570\u7b97\u672f&#xff1a;\u56db\u79cd\u6a21\u5f0f\u5bf9 Network \u7684\u538b\u529b\u7531\u7269\u7406\u8fde\u63a5\u6570\u51b3\u5b9a\u2014\u2014<\/p>\n<table>\n<tr>\u6a21\u5f0f\u8fde\u63a5\u62d3\u6251\u8fde\u63a5\u6570Network \u538b\u529b<\/tr>\n<tbody>\n<tr>\n<td>Forward<\/td>\n<td>\u4e00\u5bf9\u4e00&#xff08;\u53ef\u94fe\u5185&#xff09;<\/td>\n<td>\u94fe\u5185 0<\/td>\n<td>\u6781\u4f4e<\/td>\n<\/tr>\n<tr>\n<td>KeyBy<\/td>\n<td>\u54c8\u5e0c\u5206\u533a<\/td>\n<td>\u4e0a\u6e38 \u00d7 \u4e0b\u6e38<\/td>\n<td>\u9ad8<\/td>\n<\/tr>\n<tr>\n<td>Rebalance<\/td>\n<td>\u5168\u8fde\u63a5&#xff08;\u7b1b\u5361\u5c14\u79ef&#xff09;<\/td>\n<td>\u4e0a\u6e38 \u00d7 \u4e0b\u6e38<\/td>\n<td>\u6700\u9ad8<\/td>\n<\/tr>\n<tr>\n<td>Rescale<\/td>\n<td>\u90e8\u5206\u8fde\u63a5&#xff08;\u6309\u6bd4\u4f8b\u5206\u7ec4&#xff09;<\/td>\n<td>\u2248 \u4e0b\u6e38\u5e76\u884c\u5ea6<\/td>\n<td>\u4e2d\u7b49<\/td>\n<\/tr>\n<tr>\n<td>Rebalance \u4e0e Rescale \u7684\u672c\u8d28\u5dee\u5f02&#xff1a;Rebalance \u5728\u6240\u6709\u4e0a\u4e0b\u6e38\u4e4b\u95f4\u5efa\u901a\u9053&#xff08;\u5b8c\u6574\u7b1b\u5361\u5c14\u79ef&#xff09;&#xff0c;Rescale \u53ea\u628a\u6bcf\u4e2a\u4e0a\u6e38\u63a5\u5230\u56fa\u5b9a\u4e00\u7ec4\u4e0b\u6e38\u3002\u5e76\u884c\u5ea6\u4ece 100 \u2192 200 \u65f6&#xff0c;Rebalance \u603b\u8fde\u63a5\u6570\u589e\u957f 4 \u500d\u3001Rescale \u589e\u957f 2 \u500d\u2014\u2014\u7f51\u7edc\u5185\u5b58\u9700\u6c42\u7684\u5dee\u5f02\u76f4\u63a5\u6e90\u4e8e\u8fd9\u4e2a\u7b97\u672f\u3002\u6df7\u5408\u7b56\u7565\u7684\u5178\u578b\u7528\u6cd5&#xff1a;keyBy(\u590d\u5408\u952e) &#043; rebalance \u9884\u5904\u7406 \u89e3\u51b3\u503e\u659c&#xff0c;\u4ee3\u4ef7\u662f\u5f15\u5165\u5168\u8fde\u63a5 shuffle\u2014\u2014\u5ef6\u8fdf\u6536\u76ca\u662f\u7528\u7f51\u7edc\u5185\u5b58\u6362\u7684&#xff0c;\u6362\u4e4b\u524d\u5148\u628a\u8fde\u63a5\u6570\u7b97\u4e00\u904d\u3002<\/td>\n<td><\/td>\n<td><\/td>\n<td><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u672c\u8282\u5c0f\u7ed3&#xff1a;\u5185\u5b58\u6a21\u578b\u662f\u5206\u5c42\u9884\u7b97&#xff0c;Metaspace \u4e0e JVM Overhead \u5e76\u5217\u800c\u975e\u5d4c\u5957&#xff1b;min\/max \u4f1a\u8986\u76d6\u6bd4\u4f8b\u5e76\u6324\u538b\u5176\u4ed6\u533a\u57df&#xff1b;Managed Memory \u7684 0.4 \u662f\u6d41\u6279\u901a\u7528\u7684\u5e73\u8861\u9ed8\u8ba4\u503c&#xff0c;\u5206\u573a\u666f\u5e94\u4e0b\u63a2 0.1\u20130.2 \u6216\u4e0a\u63a2 0.6\u20130.7\u3002Managed \u5185\u90e8\u8c03\u4f18\u7684\u672c\u8d28\u662f\u201c\u518d\u5206\u914d\u51b3\u7b56\u8868\u201d\u2014\u2014\u547d\u4e2d\u7387\u4f4e\u5411 Cache \u503e\u659c\u3001Flush \u9891\u7e41\u589e\u5927 Write Buffer&#xff0c;\u800c\u975e\u4e00\u5473\u52a0\u603b\u91cf\u3002Overhead \u53ef\u4ee5\u7528\u201c\u7ebf\u7a0b\u6570 \u00d7 \u6808 &#043; Metaspace &#043; GC\/JIT\u201d\u4f30\u7b97&#xff0c;\u5c0f TM \u7684 OOMKill \u5e38\u6e90\u4e8e\u6bd4\u4f8b\u4e0b\u9650\u88ab\u538b\u7f29\u3002\u7f51\u7edc\u4fa7&#xff0c;Little\u2019s Law \u7ed9\u51fa BDP \u9700\u6c42&#xff08;\u541e\u5410 \u00d7 RTT&#xff09;&#xff0c;\u5b83\u4e0e Network \u9884\u7b97&#xff08;bpc \u4e58 p\u3001floating \u4e0d\u4e58&#xff09;\u9700\u8981\u8054\u7acb\u6c42\u89e3&#xff1b;\u5e8f\u5217\u5316\u4e0e\u4ea4\u6362\u6a21\u5f0f\u662f\u4e24\u4e2a\u9690\u5f62\u4e58\u6570&#xff0c;Scala case class \u8d70\u4e13\u7528\u5e8f\u5217\u5316\u5668\u800c\u975e Kryo\u2014\u2014\u771f\u6b63\u7684\u56de\u9000\u98ce\u9669\u5728\u666e\u901a class \u4e0e\u65e0\u7c7b\u578b\u4fe1\u606f\u7684 Row\u3002<\/p>\n<h3>\u4e09\u3001\u624b\u628a\u624b\u5b9e\u64cd&#xff1a;\u8ba9\u5185\u5b58\u4e0e\u7f51\u7edc\u6c34\u4f4d\u771f\u6b63\u53ef\u89c1<\/h3>\n<p>\u4e0a\u4e00\u7bc7\u8bb2\u53cd\u538b\u65f6\u6211\u4eec\u5b66\u8fc7\u201c\u6307\u6807\u7ec4\u5408\u5224\u8bfb\u201d&#xff1b;\u672c\u8282\u628a\u540c\u4e00\u5957\u65b9\u6cd5\u8bba\u843d\u5230\u5185\u5b58\u4e0a\u2014\u2014\u524d\u63d0\u662f\u4f5c\u4e1a\u5fc5\u987b\u771f\u6b63\u6d88\u8017 Managed Memory&#xff1a;\u4e0b\u9762\u7684\u4ee3\u7801\u542f\u7528\u4e86 RocksDB \u540e\u7aef&#xff0c;\u4e14\u7528\u6052\u7b49 key \u8ba9\u72b6\u6001\u65e0\u9650\u589e\u957f\u3001\u6bcf\u952e\u5199\u5165 4KB&#xff0c;\u9a71\u52a8 MemTable \u4e0e Block Cache \u771f\u5b9e\u722c\u5347\u3002<\/p>\n<h4>3.1 \u73af\u5883\u4e0e\u4f9d\u8d56<\/h4>\n<p>JDK 11&#xff0c;Flink 1.18.1&#xff0c;\u672c\u5730\u5e26 WebUI \u7684 mini cluster&#xff0c;Scala 2.12&#xff1a;<\/p>\n<p><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>dependencies<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>dependency<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>groupId<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>org.apache.flink<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>groupId<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>artifactId<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>flink-streaming-scala_2.12<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>artifactId<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>version<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>1.18.1<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>version<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>dependency<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>dependency<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>groupId<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>org.apache.flink<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>groupId<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>artifactId<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>flink-clients<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>artifactId<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>version<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>1.18.1<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>version<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>dependency<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token comment\">&lt;!&#8211; RocksDB \u72b6\u6001\u540e\u7aef&#xff1a;Managed Memory \u7684\u771f\u6b63\u6d88\u8d39\u8005 &#8211;&gt;<\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>dependency<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>groupId<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>org.apache.flink<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>groupId<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>artifactId<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>flink-statebackend-rocksdb<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>artifactId<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>version<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>1.18.1<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>version<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>dependency<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>dependencies<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>Java API \u7b49\u4ef7\u5199\u6cd5&#xff1a;\u5c06 flink-streaming-scala_2.12 \u6362\u6210 flink-streaming-java&#xff0c;object\/def main \u6362\u6210 public class\/static void main&#xff0c;\u5176\u4f59 API \u8c03\u7528\u540c\u540d\u3002<\/p>\n<h4>3.2 \u4f5c\u4e1a&#xff1a;RocksDB \u72b6\u6001 &#043; KeyBy Shuffle &#043; \u53ef\u8c03\u53cd\u538b<\/h4>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">org<span class=\"token punctuation\">.<\/span>apache<span class=\"token punctuation\">.<\/span>flink<span class=\"token punctuation\">.<\/span>api<span class=\"token punctuation\">.<\/span>common<span class=\"token punctuation\">.<\/span>functions<span class=\"token punctuation\">.<\/span><\/span>RichMapFunction<br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">org<span class=\"token punctuation\">.<\/span>apache<span class=\"token punctuation\">.<\/span>flink<span class=\"token punctuation\">.<\/span>api<span class=\"token punctuation\">.<\/span>common<span class=\"token punctuation\">.<\/span>state<span class=\"token punctuation\">.<\/span><\/span><span class=\"token punctuation\">{<\/span>ValueState<span class=\"token punctuation\">,<\/span> ValueStateDescriptor<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">org<span class=\"token punctuation\">.<\/span>apache<span class=\"token punctuation\">.<\/span>flink<span class=\"token punctuation\">.<\/span>configuration<span class=\"token punctuation\">.<\/span><\/span><span class=\"token punctuation\">{<\/span>Configuration<span class=\"token punctuation\">,<\/span> RestOptions<span class=\"token punctuation\">,<\/span> TaskManagerOptions<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">org<span class=\"token punctuation\">.<\/span>apache<span class=\"token punctuation\">.<\/span>flink<span class=\"token punctuation\">.<\/span>contrib<span class=\"token punctuation\">.<\/span>streaming<span class=\"token punctuation\">.<\/span>state<span class=\"token punctuation\">.<\/span><\/span>EmbeddedRocksDBStateBackend<br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">org<span class=\"token punctuation\">.<\/span>apache<span class=\"token punctuation\">.<\/span>flink<span class=\"token punctuation\">.<\/span>streaming<span class=\"token punctuation\">.<\/span>api<span class=\"token punctuation\">.<\/span>environment<span class=\"token punctuation\">.<\/span><\/span>StreamExecutionEnvironment<br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">org<span class=\"token punctuation\">.<\/span>apache<span class=\"token punctuation\">.<\/span>flink<span class=\"token punctuation\">.<\/span>streaming<span class=\"token punctuation\">.<\/span>api<span class=\"token punctuation\">.<\/span>functions<span class=\"token punctuation\">.<\/span>sink<span class=\"token punctuation\">.<\/span><\/span>SinkFunction<br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">org<span class=\"token punctuation\">.<\/span>apache<span class=\"token punctuation\">.<\/span>flink<span class=\"token punctuation\">.<\/span>streaming<span class=\"token punctuation\">.<\/span>api<span class=\"token punctuation\">.<\/span>functions<span class=\"token punctuation\">.<\/span>source<span class=\"token punctuation\">.<\/span><\/span>SourceFunction<br \/>\n<span class=\"token keyword\">object<\/span> MemoryNetworkLab <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">def<\/span> main<span class=\"token punctuation\">(<\/span>args<span class=\"token operator\">:<\/span> Array<span class=\"token punctuation\">[<\/span><span class=\"token builtin\">String<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span> <span class=\"token builtin\">Unit<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ map \u6bcf\u6761\u8bb0\u5f55\u7684 sleep \u6beb\u79d2\u6570&#xff1a;&gt;0 \u5236\u9020\u53cd\u538b\u89c2\u5bdf\u7f51\u7edc\u6307\u6807&#xff1b;&#061;0 \u653e\u5f00\u541e\u5410\u89c2\u5bdf\u5185\u5b58\u722c\u5347<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> mapSleepMs <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>args<span class=\"token punctuation\">.<\/span>length <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> args<span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>toLong <span class=\"token keyword\">else<\/span> <span class=\"token number\">5L<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> conf <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> Configuration<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    conf<span class=\"token punctuation\">.<\/span>set<span class=\"token punctuation\">(<\/span>RestOptions<span class=\"token punctuation\">.<\/span>BIND_PORT<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;8081&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    conf<span class=\"token punctuation\">.<\/span>setInteger<span class=\"token punctuation\">(<\/span>TaskManagerOptions<span class=\"token punctuation\">.<\/span>NUM_TASK_SLOTS<span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> env <span class=\"token operator\">&#061;<\/span> StreamExecutionEnvironment<span class=\"token punctuation\">.<\/span>createLocalEnvironmentWithWebUI<span class=\"token punctuation\">(<\/span>conf<span class=\"token punctuation\">)<\/span><br \/>\n    env<span class=\"token punctuation\">.<\/span>setParallelism<span class=\"token punctuation\">(<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    env<span class=\"token punctuation\">.<\/span>setStateBackend<span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> EmbeddedRocksDBStateBackend<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>   <span class=\"token comment\">\/\/ \u5173\u952e&#xff1a;\u542f\u7528 RocksDB<\/span><br \/>\n    env<span class=\"token punctuation\">.<\/span>enableCheckpointing<span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span>_000<span class=\"token punctuation\">)<\/span><br \/>\n    env<span class=\"token punctuation\">.<\/span>getCheckpointConfig<span class=\"token punctuation\">.<\/span>setCheckpointStorage<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;file:\/\/\/tmp\/mem-net-lab-ckpt&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    env<span class=\"token punctuation\">.<\/span>addSource<span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> RateSource<span class=\"token punctuation\">(<\/span><span class=\"token number\">1L<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n      <span class=\"token punctuation\">.<\/span>name<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;source&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>setParallelism<span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><br \/>\n      <span class=\"token punctuation\">.<\/span>keyBy<span class=\"token punctuation\">(<\/span>v <span class=\"token keyword\">&#061;&gt;<\/span> v<span class=\"token punctuation\">)<\/span>                          <span class=\"token comment\">\/\/ \u6052\u7b49 key&#xff1a;\u6bcf\u6761\u8bb0\u5f55\u4e00\u4e2a\u65b0\u952e&#xff0c;\u72b6\u6001\u65e0\u9650\u589e\u957f<\/span><br \/>\n      <span class=\"token punctuation\">.<\/span>map<span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> StatefulMap<span class=\"token punctuation\">(<\/span>mapSleepMs<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>name<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;stateful-map&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>setParallelism<span class=\"token punctuation\">(<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">)<\/span><br \/>\n      <span class=\"token punctuation\">.<\/span>addSink<span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> NoopSink<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>name<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;sink&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>setParallelism<span class=\"token punctuation\">(<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">)<\/span><br \/>\n      <span class=\"token comment\">\/\/ \u6ce8\u610f&#xff1a;keyBy \u5df2\u5929\u7136\u65ad\u94fe&#xff08;chaining \u4ec5\u5bf9 forward \u6210\u7acb&#xff09;&#xff0c;\u65e0\u9700\u4e5f\u4e0d\u5e94\u5728 sink \u4e0a\u518d disableChaining<\/span><br \/>\n    env<span class=\"token punctuation\">.<\/span>execute<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;memory-network-lab&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">class<\/span> RateSource<span class=\"token punctuation\">(<\/span>intervalMs<span class=\"token operator\">:<\/span> <span class=\"token builtin\">Long<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">extends<\/span> SourceFunction<span class=\"token punctuation\">[<\/span><span class=\"token builtin\">Long<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token annotation punctuation\">&#064;volatile<\/span> <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">var<\/span> running <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">true<\/span><br \/>\n  <span class=\"token keyword\">override<\/span> <span class=\"token keyword\">def<\/span> run<span class=\"token punctuation\">(<\/span>ctx<span class=\"token operator\">:<\/span> SourceFunction<span class=\"token punctuation\">.<\/span>SourceContext<span class=\"token punctuation\">[<\/span><span class=\"token builtin\">Long<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span> <span class=\"token builtin\">Unit<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">var<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0L<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>running<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> ctx<span class=\"token punctuation\">.<\/span>collect<span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&#043;&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span> Thread<span class=\"token punctuation\">.<\/span>sleep<span class=\"token punctuation\">(<\/span>intervalMs<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><br \/>\n  <span class=\"token keyword\">override<\/span> <span class=\"token keyword\">def<\/span> cancel<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span> <span class=\"token builtin\">Unit<\/span> <span class=\"token operator\">&#061;<\/span> running <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">false<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token comment\">\/** \u6bcf\u952e\u5199\u5165 4KB&#xff0c;\u4ee5\u53ef\u63a7\u901f\u7387\u9a71\u52a8 RocksDB \u7684 MemTable \u4e0e Block Cache \u589e\u957f *\/<\/span><br \/>\n<span class=\"token keyword\">class<\/span> StatefulMap<span class=\"token punctuation\">(<\/span>sleepMs<span class=\"token operator\">:<\/span> <span class=\"token builtin\">Long<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">extends<\/span> RichMapFunction<span class=\"token punctuation\">[<\/span><span class=\"token builtin\">Long<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token builtin\">Long<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token annotation punctuation\">&#064;transient<\/span> <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">var<\/span> state<span class=\"token operator\">:<\/span> ValueState<span class=\"token punctuation\">[<\/span>Array<span class=\"token punctuation\">[<\/span><span class=\"token builtin\">Byte<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> _<br \/>\n  <span class=\"token keyword\">override<\/span> <span class=\"token keyword\">def<\/span> <span class=\"token keyword\">open<\/span><span class=\"token punctuation\">(<\/span>parameters<span class=\"token operator\">:<\/span> Configuration<span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span> <span class=\"token builtin\">Unit<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    state <span class=\"token operator\">&#061;<\/span> getRuntimeContext<span class=\"token punctuation\">.<\/span>getState<span class=\"token punctuation\">(<\/span><br \/>\n      <span class=\"token keyword\">new<\/span> ValueStateDescriptor<span class=\"token punctuation\">[<\/span>Array<span class=\"token punctuation\">[<\/span><span class=\"token builtin\">Byte<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;payload&#034;<\/span><span class=\"token punctuation\">,<\/span> classOf<span class=\"token punctuation\">[<\/span>Array<span class=\"token punctuation\">[<\/span><span class=\"token builtin\">Byte<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><br \/>\n  <span class=\"token keyword\">override<\/span> <span class=\"token keyword\">def<\/span> map<span class=\"token punctuation\">(<\/span>value<span class=\"token operator\">:<\/span> <span class=\"token builtin\">Long<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span> <span class=\"token builtin\">Long<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>sleepMs <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> Thread<span class=\"token punctuation\">.<\/span>sleep<span class=\"token punctuation\">(<\/span>sleepMs<span class=\"token punctuation\">)<\/span><br \/>\n    state<span class=\"token punctuation\">.<\/span>update<span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> Array<span class=\"token punctuation\">[<\/span><span class=\"token builtin\">Byte<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">4<\/span> <span class=\"token operator\">*<\/span> <span class=\"token number\">1024<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    value<br \/>\n  <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">class<\/span> NoopSink <span class=\"token keyword\">extends<\/span> SinkFunction<span class=\"token punctuation\">[<\/span><span class=\"token builtin\">Long<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">override<\/span> <span class=\"token keyword\">def<\/span> invoke<span class=\"token punctuation\">(<\/span>value<span class=\"token operator\">:<\/span> <span class=\"token builtin\">Long<\/span><span class=\"token punctuation\">,<\/span> context<span class=\"token operator\">:<\/span> SinkFunction<span class=\"token punctuation\">.<\/span>Context<span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span> <span class=\"token builtin\">Unit<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8bbe\u8ba1\u610f\u56fe&#xff1a;sleepMs&#061;5 \u65f6 map \u6bcf subtask \u5bb9\u91cf\u7ea6 200 \u6761\/s\u3001\u56db\u4e2a subtask \u5408\u8ba1 800 \u6761\/s &lt; Source \u4f9b\u7ed9 1000 \u6761\/s \u2192 Source \u88ab\u53cd\u538b&#xff0c;outPoolUsage \u98d9\u9ad8\u3001map \u7684 busyTime \u63a5\u8fd1 1000&#xff08;sleep \u8ba1\u5165 busy&#xff0c;\u6b63\u5982\u53cd\u538b\u7bc7\u6240\u5b66&#xff09;&#xff1b;\u540c\u65f6\u72b6\u6001\u4ecd\u4ee5\u7ea6 800 \u00d7 4KB \u2248 3.2MB\/s \u589e\u957f&#xff0c;\u4e24\u4e09\u5206\u949f\u540e RocksDB \u72b6\u6001\u8fbe\u5230\u6570\u767e MB&#xff0c;Managed.Used \u660e\u663e\u722c\u5347\u3002sleepMs&#061;0 \u65f6\u541e\u5410\u653e\u5f00&#xff0c;\u5185\u5b58\u722c\u5347\u66f4\u5feb\u3002<\/p>\n<h4>3.3 \u89c2\u6d4b\u547d\u4ee4\u4e0e\u9884\u671f\u6570\u503c<\/h4>\n<p>\u4efb\u52a1\u7ea7\u6307\u6807&#xff08;\u53cd\u538b\u4e0e\u8f93\u51fa\u6c60&#xff09;&#xff1a;<\/p>\n<p><span class=\"token assign-left variable\"><span class=\"token environment constant\">JOB<\/span><\/span><span class=\"token operator\">&#061;<\/span><span class=\"token variable\"><span class=\"token variable\">$(<\/span><span class=\"token function\">curl<\/span> <span class=\"token parameter variable\">-s<\/span> http:\/\/localhost:8081\/jobs\/overview <span class=\"token operator\">|<\/span> jq <span class=\"token parameter variable\">-r<\/span> <span class=\"token string\">&#039;.jobs[0].jid&#039;<\/span><span class=\"token variable\">)<\/span><\/span><br \/>\n<span class=\"token assign-left variable\">VID_SRC<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token variable\"><span class=\"token variable\">$(<\/span><span class=\"token function\">curl<\/span> <span class=\"token parameter variable\">-s<\/span> http:\/\/localhost:8081\/jobs\/<span class=\"token environment constant\">$JOB<\/span> <span class=\"token operator\">|<\/span> jq <span class=\"token parameter variable\">-r<\/span> &#039;.vertices<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">|<\/span> select<span class=\"token punctuation\">(<\/span>.name<span class=\"token operator\">|<\/span>startswith<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;source&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token variable\">)<\/span><\/span> <span class=\"token operator\">|<\/span> .id<span class=\"token string\">&#039;)<br \/>\n# Source \u7684\u8f93\u51fa\u6c60\u4e0e\u541e\u5410<br \/>\ncurl -s &#034;http:\/\/localhost:8081\/jobs\/$JOB\/vertices\/$VID_SRC\/metrics?\\\\<br \/>\nget&#061;outPoolUsage,numBytesOutPerSecond,numBuffersOutPerSecond&#034;<br \/>\nVID_MAP&#061;$(curl -s http:\/\/localhost:8081\/jobs\/$JOB | jq -r &#039;<\/span>.vertices<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">|<\/span> select<span class=\"token punctuation\">(<\/span>.name<span class=\"token operator\">|<\/span>startswith<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;stateful-map&#034;<\/span><span class=\"token punctuation\">))<\/span> <span class=\"token operator\">|<\/span> .id&#039;<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token function\">curl<\/span> <span class=\"token parameter variable\">-s<\/span> <span class=\"token string\">&#034;http:\/\/localhost:8081\/jobs\/<span class=\"token environment constant\">$JOB<\/span>\/vertices\/<span class=\"token variable\">$VID_MAP<\/span>\/metrics?\\\\<br \/>\nget&#061;busyTimeMsPerSecond,idleTimeMsPerSecond&#034;<\/span><\/p>\n<p>TM \u7ea7\u5185\u5b58\u6307\u6807&#xff08;\u672c\u8282\u7684\u4e3b\u89d2&#xff09;&#xff1a;<\/p>\n<p><span class=\"token assign-left variable\">TM<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token variable\"><span class=\"token variable\">$(<\/span><span class=\"token function\">curl<\/span> <span class=\"token parameter variable\">-s<\/span> http:\/\/localhost:8081\/taskmanagers <span class=\"token operator\">|<\/span> jq <span class=\"token parameter variable\">-r<\/span> <span class=\"token string\">&#039;.taskmanagers[0].id&#039;<\/span><span class=\"token variable\">)<\/span><\/span><br \/>\n<span class=\"token function\">curl<\/span> <span class=\"token parameter variable\">-s<\/span> <span class=\"token string\">&#034;http:\/\/localhost:8081\/taskmanagers\/<span class=\"token variable\">$TM<\/span>\/metrics?\\\\<br \/>\nget&#061;Status.JVM.Memory.Managed.Used,Status.JVM.Memory.Heap.Used,Status.JVM.Memory.Metaspace.Used&#034;<\/span><\/p>\n<p>\u9884\u671f\u6570\u503c&#xff08;sleepMs&#061;5&#xff0c;\u8fd0\u884c 2\u20133 \u5206\u949f\u540e&#xff09;&#xff1a;<\/p>\n<table>\n<tr>\u6307\u6807\u4f4d\u7f6e\u9884\u671f\u89e3\u8bfb<\/tr>\n<tbody>\n<tr>\n<td>Managed.Used<\/td>\n<td>TM<\/td>\n<td>\u4ece \u22480 \u6301\u7eed\u722c\u5347&#xff0c;\u968f MemTable \u586b\u5145\u903c\u8fd1\u6c34\u4f4d<\/td>\n<td>RocksDB \u5728\u771f\u5b9e\u6d88\u8017 Managed Memory<\/td>\n<\/tr>\n<tr>\n<td>Heap.Used<\/td>\n<td>TM<\/td>\n<td>\u4f4e\u4e14\u5e73\u7a33<\/td>\n<td>\u72b6\u6001\u5728\u5806\u5916&#xff0c;\u5806\u538b\u529b\u5c0f\u2014\u2014\u5370\u8bc1\u540e\u7aef\u9009\u578b<\/td>\n<\/tr>\n<tr>\n<td>Metaspace.Used<\/td>\n<td>TM<\/td>\n<td>\u7a33\u5b9a\u5728 100\u2013200MB \u91cf\u7ea7<\/td>\n<td>\u4e0e 2.4 \u8282\u4f30\u7b97\u5bf9\u7167<\/td>\n<\/tr>\n<tr>\n<td>Source \u7684 outPoolUsage<\/td>\n<td>task<\/td>\n<td>\u63a5\u8fd1 100%<\/td>\n<td>\u88ab map \u9650\u901f&#xff0c;\u8f93\u51fa\u7f13\u51b2\u5360\u6ee1<\/td>\n<\/tr>\n<tr>\n<td>Source \u7684 numBytesOutPerSecond<\/td>\n<td>task<\/td>\n<td>\u7ea6 10\u201320KB\/s&#xff08;\u6784\u6210\u89c1\u4e0b&#xff09;<\/td>\n<td>\u4e0e\u5bb9\u91cf\u63a8\u7b97\u4e92\u9a8c<\/td>\n<\/tr>\n<tr>\n<td>map \u7684 busyTimeMsPerSecond<\/td>\n<td>task<\/td>\n<td>\u2248950\u20131000<\/td>\n<td>sleep \u8ba1\u5165 busy&#xff08;\u56de\u770b\u53cd\u538b\u7bc7\u94c1\u5f8b&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>map \u7684 inPoolUsage<\/td>\n<td>task<\/td>\n<td>\u22480&#xff0c;\u4e14\u65e0\u4fe1\u606f\u91cf<\/td>\n<td>\u89c1\u4e0b\u65b9 local \u901a\u9053\u9677\u9631<\/td>\n<\/tr>\n<tr>\n<td>\u8f93\u51fa\u901f\u7387\u7684\u6784\u6210\u62c6\u89e3&#xff1a;\u6bcf\u6761\u8bb0\u5f55\u7684\u672c\u4f53\u662f Long \u5e8f\u5217\u5316 8B &#043; \u957f\u5ea6\u524d\u7f00 4B &#061; 12B&#xff1b;800 \u6761\/s \u7684\u672c\u4f53\u6d41\u91cf \u2248 9.6KB\/s\u3002\u534f\u8bae\u5c01\u88c5&#xff08;Netty \u5e27\u5934\u7b49&#xff09;\u6309\u7f13\u51b2\u800c\u975e\u6309\u8bb0\u5f55\u8ba1\u8d39\u2014\u2014\u53ea\u6709\u5f53\u6bcf\u6761\u8bb0\u5f55\u72ec\u5360\u4e00\u4e2a\u7f13\u51b2\u65f6\u624d\u4f1a\u5168\u989d\u53e0\u52a0\u5230\u6bcf\u6761\u4e0a\u3002\u800c\u53cd\u538b\u573a\u666f\u6070\u662f\u5206\u644a\u6548\u679c\u6700\u5dee\u7684&#xff1a;\u7f13\u51b2\u5e38\u672a\u586b\u6ee1\u5373\u88ab\u51b2\u5237&#xff0c;\u6bcf\u6761\u8bb0\u5f55\u5b9e\u9645\u627f\u62c5\u7684\u534f\u8bae\u5f00\u9500\u8d8b\u8fd1\u5168\u989d\u3002\u56e0\u6b64\u5408\u7406\u9884\u671f\u662f\u7ea6 10\u201320KB\/s&#xff1a;\u4e0b\u9650\u5bf9\u5e94\u5206\u644a\u826f\u597d&#xff0c;\u4e0a\u9650\u5bf9\u5e94\u53cd\u538b\u4e0b\u5206\u644a\u6700\u5dee\u3002\u8fd9\u4e2a\u533a\u95f4\u6bd4\u5355\u70b9\u6570\u5b57\u66f4\u8bda\u5b9e\u3002<\/td>\n<td><\/td>\n<td><\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>local \u901a\u9053\u9677\u9631&#xff08;\u672c\u5b9e\u9a8c\u6700\u5bb9\u6613\u88ab\u8bef\u8bfb\u7684\u4e00\u5904&#xff09;&#xff1a;\u5b98\u65b9\u6587\u6863\u660e\u786e inPoolUsage \u5ffd\u7565 LocalInputChannel&#xff0c;\u800c\u672c\u5730 mini cluster \u6240\u6709\u5b50\u4efb\u52a1\u540c JVM\u3001\u901a\u9053\u5168\u4e3a local\u2014\u2014inPoolUsage \u6052\u4e3a\u4f4e\u503c\u5e76\u4e0d\u4ee3\u8868\u6ca1\u6709\u53cd\u538b&#xff08;\u4e0a\u8868 Source \u7684 outPoolUsage \u5df2\u8bc1\u660e\u53cd\u538b\u5b58\u5728&#xff09;\u3002\u8981\u5728 inPoolUsage \u4e0a\u83b7\u5f97\u6709\u6548\u8bfb\u6570&#xff0c;\u9700\u8981\u8fdc\u7a0b\u901a\u9053&#xff1a;<\/td>\n<td><\/td>\n<td><\/td>\n<td><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span class=\"token comment\"># \u53d8\u4f53&#xff1a;\u53cc TM \u89c2\u5bdf inPoolUsage<\/span><br \/>\n<span class=\"token comment\"># 0) \u5148\u786e\u8ba4\u672c\u673a\u53ef\u7528\u5185\u5b58 \u2265 2 \u00d7 process.size\u2014\u2014\u53cc TM \u4f1a\u6309\u914d\u7f6e\u5404\u5360\u4e00\u4efd\u5b8c\u6574\u9884\u7b97<\/span><br \/>\n<span class=\"token comment\"># 1) \u5728 $FLINK_HOME\/conf\/workers \u4e2d\u5199\u4e24\u884c localhost<\/span><br \/>\n<span class=\"token comment\">#    &#xff08;TM \u7684 rpc.port \u4e0e data.port \u9ed8\u8ba4\u4e3a 0 &#061; \u968f\u673a&#xff0c;\u540c\u673a\u53cc\u542f\u4e0d\u51b2\u7a81&#xff09;<\/span><br \/>\n<span class=\"token comment\"># 2) $FLINK_HOME\/bin\/start-cluster.sh<\/span><br \/>\n<span class=\"token comment\"># 3) $FLINK_HOME\/bin\/flink run -c MemoryNetworkLab your-jar.jar 5<\/span><br \/>\n<span class=\"token comment\"># keyBy \u901a\u9053\u6b64\u65f6\u542b\u8fdc\u7a0b\u6210\u5206&#xff0c;\u63a5\u6536\u65b9\u7684 inPoolUsage \u624d\u6709\u5224\u8bfb\u4ef7\u503c<\/span><\/p>\n<h4>3.4 \u5e38\u89c1\u9519\u8bef\u4e0e\u8c03\u8bd5<\/h4>\n<table>\n<tr>\u9519\u8bef\u73b0\u8c61\u6839\u56e0\u65b9\u5411\u8bca\u65ad\u547d\u4ee4\u89e3\u51b3<\/tr>\n<tbody>\n<tr>\n<td>OutOfMemoryError: Java heap space<\/td>\n<td>Task Heap \u4e0d\u8db3<\/td>\n<td>jmap -heap &lt;pid&gt;<\/td>\n<td>\u589e\u5927 task.heap&#xff0c;\u6216\u6539\u7528 RocksDB \u628a\u72b6\u6001\u632a\u51fa\u5806<\/td>\n<\/tr>\n<tr>\n<td>OutOfMemoryError: Direct buffer memory<\/td>\n<td>Network\/Framework Off-Heap \u4e0d\u8db3<\/td>\n<td>\u6838\u5bf9 network.max \u4e0e buffers-per-channel \u7684\u4e58\u79ef<\/td>\n<td>\u8c03\u5927 Network \u914d\u989d\u6216\u51cf\u5c0f\u6bcf\u901a\u9053\u7f13\u51b2<\/td>\n<\/tr>\n<tr>\n<td>Insufficient number of network buffers<\/td>\n<td>Network \u603b\u91cf\u4e0d\u591f&#xff08;2.5 \u8282\u7b97\u672f\u7206\u4e86&#xff09;<\/td>\n<td>\u6309\u516c\u5f0f\u6838\u7b97\u901a\u9053\u6570 \u00d7 \u7f13\u51b2\u6570<\/td>\n<td>\u89c1 4.1 \u8282\u7684\u4ee3\u4ef7\u9012\u589e\u5904\u7f6e\u987a\u5e8f<\/td>\n<\/tr>\n<tr>\n<td>\u5bb9\u5668 OOMKilled \u4f46\u5806\u7a7a\u95f2<\/td>\n<td>Overhead \u9884\u7559\u4e0d\u8db3 \/ native \u8d85\u652f<\/td>\n<td>kubectl top pod\u3001jcmd &lt;pid&gt; VM.native_memory summary<\/td>\n<td>\u589e\u5927 jvm-overhead.min\/fraction&#xff1b;\u6392\u67e5 JNI\/Netty\/\u672a\u6258\u7ba1 RocksDB<\/td>\n<\/tr>\n<tr>\n<td>OutOfMemoryError: Metaspace<\/td>\n<td>\u7c7b\u52a0\u8f7d\u6570\u8d85\u9884\u671f<\/td>\n<td>jstat -gcmetacapacity &lt;pid&gt;<\/td>\n<td>\u589e\u5927 jvm-metaspace.size<\/td>\n<\/tr>\n<tr>\n<td>RocksDB \u8bfb\u53d8\u6162<\/td>\n<td>Block Cache \u547d\u4e2d\u7387 &lt; 90%<\/td>\n<td>RocksDB \u6307\u6807<\/td>\n<td>\u6309 2.3 \u51b3\u7b56\u8868\u5411 Cache \u503e\u659c<\/td>\n<\/tr>\n<tr>\n<td>Managed.Used \u4e00\u76f4\u4e3a 0<\/td>\n<td>\u6ca1\u542f RocksDB \u6216\u72b6\u6001\u4e0d\u589e\u957f<\/td>\n<td>\u68c0\u67e5 setStateBackend \u4e0e keyBy \u7b56\u7565<\/td>\n<td>\u786e\u8ba4\u540e\u7aef\u4e0e\u72b6\u6001\u5199\u5165\u8def\u5f84&#xff08;\u672c\u8282\u4ee3\u7801\u7684\u5e38\u89c1\u6539\u574f\u70b9&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>inPoolUsage \u6052\u4e3a 0 \u4ee5\u4e3a\u6ca1\u53cd\u538b<\/td>\n<td>local \u901a\u9053\u9677\u9631<\/td>\n<td>\u5bf9\u7167\u53d1\u9001\u65b9 outPoolUsage<\/td>\n<td>\u7528\u53cc TM \u53d8\u4f53\u6216\u53ea\u770b outPoolUsage<\/td>\n<\/tr>\n<tr>\n<td>\u53cc TM \u542f\u52a8\u5931\u8d25\u6216\u672c\u673a\u5361\u6b7b<\/td>\n<td>\u673a\u5668\u5185\u5b58\u4e0d\u8db3<\/td>\n<td>free -h<\/td>\n<td>\u4fdd\u8bc1\u53ef\u7528\u5185\u5b58 \u2265 2 \u00d7 TM \u914d\u7f6e&#xff0c;\u6216\u4e0b\u8c03 process.size \u518d\u8bd5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u672c\u8282\u5c0f\u7ed3&#xff1a;\u8ba9\u6c34\u4f4d\u53ef\u89c1\u7684\u524d\u63d0\u662f\u8ba9\u8d44\u6e90\u771f\u6b63\u88ab\u6d88\u8017\u2014\u2014\u542f\u7528 RocksDB\u3001\u7528\u589e\u957f\u578b key \u9a71\u52a8\u72b6\u6001\u5199\u5165&#xff0c;Managed.Used \u624d\u4f1a\u722c\u5347&#xff1b;\u7528\u53ef\u8c03 sleep \u5236\u9020\u53cd\u538b&#xff0c;outPoolUsage \u624d\u6709\u8bfb\u6570\u3002\u89c2\u6d4b\u8981\u540c\u65f6\u8986\u76d6\u4efb\u52a1\u7ea7&#xff08;outPoolUsage\/busyTime&#xff09;\u4e0e TM \u7ea7&#xff08;Managed\/Heap\/Metaspace&#xff09;\u4e24\u5c42&#xff1b;\u8f93\u51fa\u901f\u7387\u7684\u4f30\u7b97\u8981\u533a\u5206\u201c\u6309\u8bb0\u5f55\u8ba1\u8d39\u7684\u672c\u4f53\u201d\u4e0e\u201c\u6309\u7f13\u51b2\u8ba1\u8d39\u7684\u534f\u8bae\u5c01\u88c5\u201d\u2014\u2014\u53cd\u538b\u4e0b\u5206\u644a\u6700\u5dee&#xff0c;\u53d6\u533a\u95f4\u800c\u975e\u5355\u70b9\u3002\u6700\u5927\u7684\u9677\u9631\u662f local \u901a\u9053\u4f7f inPoolUsage \u5931\u53bb\u4fe1\u606f\u91cf\u2014\u2014\u5224\u8bfb\u65f6\u6c38\u8fdc\u4ee5\u53d1\u9001\u65b9\u7684 outPoolUsage \u4e3a\u51c6&#xff0c;\u6216\u6362\u53cc TM \u73af\u5883&#xff08;\u5e76\u5148\u6838\u7b97\u672c\u673a\u5185\u5b58&#xff09;\u3002<\/p>\n<h3>\u56db\u3001\u8fdb\u9636\u601d\u8003&#xff1a;OOM \u5206\u5c42\u8bca\u65ad\u4e0e\u5e76\u884c\u5ea6\u4e0a\u9650<\/h3>\n<h4>4.1 OOM \u7684\u5206\u5c42\u8bca\u65ad\u6d41\u7a0b<\/h4>\n<p>\u62ff\u5230\u4e00\u4e2a OOM&#xff0c;\u5148\u5206\u7c7b\u518d\u52a8\u624b&#xff0c;\u4e0d\u8981\u5148\u52a0\u603b\u5185\u5b58\u2014\u2014\u5f02\u5e38\u7c7b\u578b\u4e0d\u540c&#xff0c;\u52a0\u5185\u5b58\u53ef\u80fd\u5b8c\u5168\u65e0\u6548&#xff1a;<\/p>\n<table>\n<tr>\u7b2c\u4e00\u6b65&#xff1a;\u5f02\u5e38\u7c7b\u578b\u7b2c\u4e8c\u6b65&#xff1a;\u5bf9\u53f7\u53c2\u6570\u7b2c\u4e09\u6b65&#xff1a;\u82e5\u4ecd\u8d85\u652f<\/tr>\n<tbody>\n<tr>\n<td>Java heap space<\/td>\n<td>task.heap \/ framework.heap<\/td>\n<td>\u68c0\u67e5\u5806\u6cc4\u6f0f\u3001\u72b6\u6001\u662f\u5426\u8be5\u8fc1 RocksDB<\/td>\n<\/tr>\n<tr>\n<td>Direct buffer memory<\/td>\n<td>network.* \/ task&#043;framework off-heap<\/td>\n<td>\u6392\u67e5 Netty \u6c60\u4e0e\u7528\u6237 DirectByteBuffer<\/td>\n<\/tr>\n<tr>\n<td>Metaspace<\/td>\n<td>jvm-metaspace.size<\/td>\n<td>\u6392\u67e5\u52a8\u6001\u7c7b\u751f\u6210&#xff08;\u811a\u672c\/\u53cd\u5c04&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>Insufficient network buffers<\/td>\n<td>network.fraction\/max &#043; 2.5 \u8282\u7b97\u672f<\/td>\n<td>\u6309\u4ee3\u4ef7\u9012\u589e\u6392\u5e8f\u5904\u7f6e&#xff08;\u89c1\u4e0b&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u5bb9\u5668 OOMKilled&#xff08;\u65e0 Java \u5f02\u5e38&#xff09;<\/td>\n<td>jvm-overhead.min\/fraction<\/td>\n<td>\u7528 NMT\/pmap \u6392\u67e5 native \u6cc4\u6f0f<\/td>\n<\/tr>\n<tr>\n<td>\u7f51\u7edc\u7f13\u51b2\u4e0d\u8db3\u7684\u5904\u7f6e\u987a\u5e8f&#xff08;\u4ee3\u4ef7\u9012\u589e&#xff0c;\u52ff\u8df3\u7ea7&#xff09;&#xff1a;<\/td>\n<td><\/td>\n<td><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<li>\u5148\u6269 network.max\u2014\u2014\u65e0\u6027\u80fd\u4ee3\u4ef7&#xff0c;\u53ea\u662f\u91cd\u65b0\u5212\u9884\u7b97&#xff08;\u4ee3\u4ef7\u7531 2.2 \u8282\u7684\u5bf9\u51b2\u673a\u5236\u8f6c\u79fb\u5230\u5176\u4ed6\u533a\u57df&#xff09;&#xff1b;<\/li>\n<li>\u4ecd\u4e0d\u8db3&#xff0c;\u518d\u964d buffers-per-channel\u2014\u2014\u727a\u7272\u5355\u901a\u9053 BDP \u6ee1\u8db3\u5ea6&#xff0c;\u8de8\u673a\u623f\u9ad8 RTT \u94fe\u8def\u614e\u7528&#xff1b;<\/li>\n<li>\u6700\u540e\u624d\u964d\u5e76\u884c\u5ea6\u2014\u2014\u76f4\u63a5\u727a\u7272\u541e\u5410&#xff0c;\u662f\u4e09\u8005\u4e2d\u4ee3\u4ef7\u6700\u9ad8\u7684\u624b\u6bb5\u3002<br \/>\n\u539f\u5219&#xff1a;\u5f02\u5e38\u7c7b\u578b \u2192 \u53c2\u6570 \u2192 native \u6cc4\u6f0f&#xff0c;\u987a\u5e8f\u4e0d\u53ef\u5012\u7f6e\u3002\u5bb9\u5668 OOMKill \u800c Java \u4fa7\u65e0\u5f02\u5e38\u65f6&#xff0c;\u95ee\u9898\u51e0\u4e4e\u5fc5\u7136\u5728\u201c\u7b2c\u4e8c\u672c\u8d26\u201d\u2014\u2014\u7528 pmap \u4e0e NMT \u627e\u5230\u90a3\u5757\u4e0d\u5728\u4efb\u4f55 Flink \u53c2\u6570\u8868\u91cc\u7684\u5185\u5b58\u3002<\/li>\n<h4>4.2 \u7f51\u7edc\u9884\u7b97\u4e0b\u7684\u5e76\u884c\u5ea6\u4e0a\u9650&#xff1a;\u628a\u516c\u5f0f\u89e3\u51fa\u6765<\/h4>\n<p>\u628a 2.5 \u8282\u7684\u9700\u6c42\u516c\u5f0f\u5012\u8fc7\u6765&#xff0c;\u53ef\u4ee5\u63a8\u5bfc\u7ed9\u5b9a\u7f51\u7edc\u9884\u7b97\u4e0b\u7684\u5e76\u884c\u5ea6\u4e0a\u9650\u3002\u5148\u628a\u7ea6\u5b9a\u5199\u6e05\u695a&#xff1a;Budget &#061; Network \u914d\u989d&#xff0c;S &#061; \u6bcf TM \u7684 slot \u6570&#xff0c;bpc &#061; buffers-per-channel&#xff08;\u968f p \u7ebf\u6027\u653e\u5927&#xff09;&#xff0c;fpg &#061; floating-buffers-per-gate&#xff08;\u4e0d\u968f p \u653e\u5927&#xff09;&#xff0c;\u5e76\u5047\u8bbe\u6bcf\u4e2a subtask \u53ea\u6709\u4e00\u4e2a\u8f93\u5165 gate&#xff1a;<\/p>\n<p>\u7ea6\u675f&#xff1a;  S \u00d7 (p \u00d7 bpc &#043; fpg) \u00d7 32KB \u2264 Budget<br \/>\n\u6c42\u89e3 p&#xff1a;  p \u00d7 bpc \u2264 Budget \/ (S \u00d7 32KB) \u2212 fpg<br \/>\n              p \u2264 (Budget \/ (S \u00d7 32KB) \u2212 fpg) \/ bpc<\/p>\n<p>\u6ce8\u610f\u6c42\u89e3\u6b65\u9aa4&#xff1a;fpg \u5728\u62ec\u53f7\u5185\u4f46\u4e0d\u4e58 p&#xff0c;\u6240\u4ee5\u5b83\u53ea\u80fd\u4ece\u201c\u9664\u4ee5 S \u00d7 32KB \u4e4b\u540e\u201d\u7684\u9879\u91cc\u51cf\u6389&#xff0c;\u4e0d\u80fd\u4e0e bpc \u5408\u5e76\u6210\u4e00\u4e2a (bpc &#043; fpg) \u6574\u4f53\u505a\u5206\u6bcd\u2014\u2014\u5408\u5e76\u4f1a\u5bfc\u81f4 fpg \u88ab\u9519\u8bef\u5730\u4e58\u4e0a p&#xff0c;\u7ed3\u679c\u5dee\u51fa\u6570\u500d\u3002<br \/>\n\u7b97\u4f8b&#xff08;Budget &#061; 512MB&#xff0c;S &#061; 8&#xff0c;bpc &#061; 2&#xff0c;fpg &#061; 8&#xff09;&#xff1a;<\/p>\n<p>512MB \/ (8 \u00d7 32KB) &#061; 536,870,912 \/ 262,144 &#061; 2048 buffers<br \/>\n(2048 \u2212 8) \/ 2 &#061; 1020  \u2192  p_max \u2248 1020<\/p>\n<p>\u770b\u8d77\u6765\u5bbd\u88d5&#xff0c;\u4f46\u4e24\u4e2a\u56e0\u7d20\u4f1a\u5feb\u901f\u51fb\u7a7f\u5b83&#xff1a;<\/p>\n<ul>\n<li>\u56e0\u7d20\u4e00&#xff1a;\u4e3a\u6ee1\u8db3 BDP \u8c03\u5927 bpc\u3002\u628a bpc \u63d0\u5230 64&#xff08;2.5 \u8282\u7684 BDP \u63a8\u5bfc&#xff09;\u540e&#xff1a;(2048 \u2212 8) \/ 64 \u2248 32\u2014\u2014\u5355 TM \u53ef\u652f\u6491\u7684\u4e0a\u6e38\u5e76\u884c\u5ea6\u4ece 1020 \u9aa4\u964d\u5230 32\u3002\u8fd9\u6b63\u662f\u201cBDP \u8c03\u4f18\u4e0e\u5185\u5b58\u9884\u7b97\u662f\u8054\u7acb\u7ea6\u675f\u201d\u7684\u5b9a\u91cf\u8868\u8fbe&#xff1a;\u4f60\u8981\u4e48\u6269 Network \u9884\u7b97&#xff0c;\u8981\u4e48\u63a5\u53d7\u4f4e\u5e76\u884c\u5ea6&#xff0c;\u4e24\u8005\u4e0d\u53ef\u517c\u5f97\u3002<\/li>\n<li>\u56e0\u7d20\u4e8c&#xff1a;\u5e76\u884c\u5ea6\u672c\u8eab\u8d85\u9650\u3002p &#061; 2000 \u5df2\u7ecf\u8d85\u8fc7 p_max &#061; 1020&#xff0c;\u8fd9\u91cc\u7b97\u5b83\u6b63\u662f\u4e3a\u4e86\u5c55\u793a\u8d85\u9650\u7684\u540e\u679c&#xff1a;\u9700\u6c42 &#061; 8 \u00d7 (2000 \u00d7 2 &#043; 8) \u00d7 32KB \u2248 1.05GB &gt; 512MB&#xff0c;\u7f13\u51b2\u6c60\u88ab\u538b\u7f29&#xff0c;\u6bcf\u901a\u9053\u5206\u4e0d\u5230\u8db3\u591f credit\u2014\u2014\u52a0\u5e76\u884c\u5ea6\u4e0d\u63d0\u5347\u541e\u5410&#xff0c;\u53cd\u800c\u62c9\u4f4e\u5355\u901a\u9053\u7684 BDP \u6ee1\u8db3\u5ea6\u3002<\/li>\n<li>\u56e0\u7d20\u4e09&#xff1a;gate \u6570\u6bd4\u5e76\u884c\u5ea6\u66f4\u9690\u853d\u3002\u5982\u679c\u4f5c\u4e1a\u542b join\u2014\u2014\u6bcf\u4e2a subtask \u6709\u4e24\u4e2a\u8f93\u5165 gate&#xff0c;\u7b49\u6548\u4e8e S \u7ffb\u500d&#xff1a;p_max &#061; (512MB \/ (8 \u00d7 2 \u00d7 32KB) \u2212 8) \/ 2 &#061; (1024 \u2212 8) \/ 2 &#061; 508&#xff0c;\u76f4\u63a5\u51cf\u534a\u3002\u52a0\u4e00\u4e2a join \u4e0d\u4f1a\u62a5\u9519\u3001\u4e0d\u4f1a\u63d0\u793a&#xff0c;\u4f46\u4f60\u7684\u7f51\u7edc\u9884\u7b97\u4e0a\u9650\u5df2\u7ecf\u6084\u6084\u780d\u534a\u2014\u2014\u8fd9\u662f\u4e09\u6761\u56e0\u7d20\u4e2d\u6700\u5bb9\u6613\u88ab\u5ffd\u7565\u7684\u4e00\u6761\u3002<br \/>\n\u8fd9\u5c31\u662f Amdahl \u5b9a\u5f8b\u8d44\u6e90\u7248\u7684\u9884\u8a00&#xff1a;\u8d44\u6e90\u578b\u74f6\u9888\u4e0b&#xff0c;\u5e76\u884c\u5ea6\u6536\u76ca\u9012\u51cf\u4e3a\u8d1f\u3002\u89e3\u6cd5\u4e0d\u662f\u7ee7\u7eed\u52a0\u5e76\u884c\u5ea6&#xff0c;\u800c\u662f\u8054\u7acb\u6c42\u89e3&#xff1a;\u6269 Network \u9884\u7b97\u3001\u964d\u6bcf\u901a\u9053\u7f13\u51b2\u3001\u6216\u7528 Rescale \u6362\u6389 Rebalance \u524a\u51cf\u8fde\u63a5\u6570&#xff08;100\u2192200 \u65f6\u8fde\u63a5\u6570\u589e\u957f 2 \u500d\u800c\u975e 4 \u500d&#xff09;\u3002<\/li>\n<\/ul>\n<h4>4.3 \u4e00\u6b21\u53ea\u6539\u4e00\u4e2a\u53d8\u91cf<\/h4>\n<p>\u5185\u5b58\u8c03\u4f18\u7684\u9a8c\u8bc1\u7eaa\u5f8b&#xff1a;\u4e00\u6b21\u53ea\u6539\u4e00\u4e2a\u53c2\u6570&#xff0c;\u7528\u7b2c 3 \u7ae0\u7684 REST \u547d\u4ee4\u8bb0\u5f55\u6539\u524d\u6539\u540e\u7684\u6c34\u4f4d&#xff08;Managed.Used \u7684\u7a33\u6001\u3001outPoolUsage \u7684\u5206\u5e03\u3001Checkpoint \u65f6\u957f&#xff09;\u3002\u5982\u679c\u8c03\u6574\u751f\u6548&#xff0c;\u6307\u6807\u5e94\u6309 2.3\/2.5 \u8282\u7684\u9884\u6d4b\u65b9\u5411\u79fb\u52a8&#xff1b;\u5982\u679c\u4e0d\u52a8&#xff0c;\u8bf4\u660e\u74f6\u9888\u5224\u65ad\u9519\u4e86\u2014\u2014\u56de\u5230\u5206\u5c42\u8bca\u65ad\u91cd\u65b0\u5206\u7c7b&#xff0c;\u800c\u4e0d\u662f\u7ee7\u7eed\u53e0\u53c2\u6570\u3002<\/p>\n<p>\u672c\u8282\u5c0f\u7ed3&#xff1a;OOM \u8bca\u65ad\u7684\u987a\u5e8f\u662f\u201c\u5f02\u5e38\u7c7b\u578b \u2192 \u53c2\u6570 \u2192 native \u6cc4\u6f0f\u201d&#xff0c;\u5bb9\u5668\u7ea7 Kill \u5c5e\u4e8e\u7b2c\u4e8c\u672c\u8d26&#xff0c;\u52a0\u5806\u65e0\u7528&#xff1b;\u7f51\u7edc\u7f13\u51b2\u4e0d\u8db3\u6309\u4ee3\u4ef7\u9012\u589e\u5904\u7f6e\u2014\u2014\u5148\u6269\u9884\u7b97\u3001\u518d\u964d bpc\u3001\u6700\u540e\u624d\u964d\u5e76\u884c\u5ea6\u3002\u7f51\u7edc\u9884\u7b97\u7ed9\u51fa\u5e76\u884c\u5ea6\u786c\u4e0a\u9650&#xff0c;\u6c42\u89e3\u65f6 bpc \u4e0e fpg \u7684\u4e58\u6cd5\u7ed3\u6784\u4e0d\u53ef\u6df7\u6dc6\u2014\u2014\u9ed8\u8ba4\u914d\u7f6e\u4e0b p_max \u2248 1020&#xff0c;\u4f46\u628a bpc \u63d0\u5230 64 \u6ee1\u8db3 BDP \u540e\u9aa4\u964d\u81f3 32&#xff0c;\u542b join \u7684\u53cc gate \u4f5c\u4e1a\u518d\u51cf\u534a\u81f3 508\u3002\u52a0\u5e76\u884c\u5ea6\u5728\u8d44\u6e90\u74f6\u9888\u4e0b\u6536\u76ca\u4e3a\u8d1f&#xff0c;\u6240\u6709\u8c03\u6574\u90fd\u8981\u4ee5\u6307\u6807\u6c34\u4f4d\u7684\u524d\u540e\u5bf9\u6bd4\u6765\u9a8c\u8bc1\u3002<\/p>\n<h3>\u4e94\u3001\u603b\u7ed3&#xff1a;\u5185\u5b58\u8c03\u4f18\u662f\u9884\u7b97\u5206\u914d&#xff0c;\u4e0d\u662f\u5bb9\u91cf\u5806\u53e0<\/h3>\n<p>\u56de\u5230\u6700\u521d\u7684\u95ee\u9898&#xff1a;TaskManager \u7684\u5185\u5b58\u662f\u5982\u4f55\u5206\u914d\u7684&#xff1f;<br \/>\n\u5185\u5b58\u5c42\u9762&#xff1a;Flink \u628a\u8fdb\u7a0b\u5207\u6210\u5206\u5c42\u9884\u7b97\u2014\u2014Metaspace \u4e0e JVM Overhead \u4f4d\u4e8e Flink \u5185\u5b58\u4f53\u7cfb\u4e4b\u5916\u3001\u76f8\u4e92\u5e76\u5217&#xff1b;Managed Memory \u662f\u4ea4\u7ed9 RocksDB \u7684\u52a8\u6001\u914d\u989d&#xff0c;\u5185\u90e8\u518d\u6309 write-buffer-ratio \u4e0e high-prio-pool-ratio \u5728\u5199\u8def\u5f84\u4e0e\u8bfb\u8def\u5f84\u4e4b\u95f4\u518d\u5206\u914d&#xff1b;Network Memory \u7531\u201c\u901a\u9053\u6570 \u00d7 \u6bcf\u901a\u9053\u7f13\u51b2\u6570\u201d\u6d88\u8017&#xff1b;min\/max \u4f1a\u8986\u76d6\u6bd4\u4f8b\u5e76\u6324\u538b\u76f8\u90bb\u533a\u57df&#xff1b;Overhead \u53ef\u4ee5\u7528\u201c\u7ebf\u7a0b\u6570 \u00d7 \u6808 &#043; Metaspace &#043; GC\/JIT\u201d\u63d0\u524d\u4f30\u7b97&#xff0c;\u662f\u5bb9\u5668 OOMKill \u7684\u4e3b\u6218\u573a\u3002<br \/>\n\u7f51\u7edc\u4e0e\u5e8f\u5217\u5316\u5c42\u9762&#xff1a;Credit \u6d41\u63a7\u628a\u53cd\u538b\u7c92\u5ea6\u4e0b\u6c89\u5230\u901a\u9053\u7ea7&#xff0c;\u4ee3\u4ef7\u662f Network \u9700\u6c42\u968f\u901a\u9053\u6570&#xff08;\u7b1b\u5361\u5c14\u79ef&#xff09;\u589e\u957f&#xff1b;Little\u2019s Law \u7ed9\u51fa\u5355\u901a\u9053\u7684 BDP \u9700\u6c42&#xff08;\u541e\u5410 \u00d7 RTT&#xff09;&#xff0c;\u5b83\u4e0e Network \u9884\u7b97\u9700\u8981\u8054\u7acb\u6c42\u89e3&#xff1b;\u5e8f\u5217\u5316\u4e0e\u4ea4\u6362\u6a21\u5f0f\u662f\u4e24\u4e2a\u9690\u5f62\u4e58\u6570&#xff0c;Scala case class \u8d70\u4e13\u7528\u5e8f\u5217\u5316\u5668\u800c\u975e Kryo&#xff0c;\u771f\u6b63\u7684\u56de\u9000\u98ce\u9669\u5728\u666e\u901a class \u4e0e\u65e0\u7c7b\u578b\u4fe1\u606f\u7684 Row\u2014\u2014\u7528\u65e5\u5fd7\u548c disableGenericTypes() \u8ba9\u56de\u9000\u663e\u5f0f\u5316\u3002<br \/>\n\u5982\u679c\u53ea\u5e26\u8d70\u4e09\u53e5\u8bdd&#xff1a;<\/p>\n<li>\u914d\u7f6e\u7684\u503c\u4e0d\u7b49\u4e8e\u8fd0\u884c\u65f6\u7684\u8d26\u3002process.size \u4e4b\u5916\u6709 Metaspace \u4e0e Overhead \u4e24\u9879 Flink \u7ba1\u4e0d\u4f4f\u7684\u5f00\u9500&#xff1b;\u5bb9\u5668 OOMKilled \u800c\u5806\u7a7a\u95f2\u65f6&#xff0c;\u5148\u6309\u201c\u5f02\u5e38\u7c7b\u578b \u2192 \u53c2\u6570 \u2192 native \u6cc4\u6f0f\u201d\u5206\u5c42\u6392\u67e5&#xff0c;\u52a0\u5806\u6ca1\u6709\u7528\u3002<\/li>\n<li>Managed Memory \u7684\u8c03\u4f18\u662f\u6c34\u4f4d\u518d\u5206\u914d&#xff0c;\u4e0d\u662f\u603b\u91cf\u5806\u53e0\u3002\u547d\u4e2d\u7387\u4f4e\u4e8e 90% \u5411 Block Cache \u503e\u659c&#xff0c;Flush \u9891\u7e41\u589e\u5927 Write Buffer\u2014\u2014\u914d\u989d\u4e0d\u53d8\u3001\u7ed3\u6784\u53d8\u4e86&#xff0c;\u5f80\u5f80\u5c31\u662f\u89e3\u3002<\/li>\n<li>\u5e8f\u5217\u5316\u548c\u6570\u636e\u4ea4\u6362\u6a21\u5f0f\u662f\u5185\u5b58\u7684\u9690\u5f62\u4e58\u6570&#xff0c;\u7f51\u7edc\u9884\u7b97\u662f\u5e76\u884c\u5ea6\u7684\u786c\u4e0a\u754c\u3002\u6bcf\u8bb0\u5f55\u5b57\u8282\u6570 \u00d7 \u541e\u5410\u51b3\u5b9a\u7f51\u7edc\u5e26\u5bbd\u5360\u7528&#xff0c;Rebalance \u7684\u7b1b\u5361\u5c14\u79ef\u8ba9 Network \u9700\u6c42\u968f\u5e76\u884c\u5ea6\u5e73\u65b9\u589e\u957f&#xff1b;\u89e3\u51fa p_max \u540e\u4f60\u4f1a\u53d1\u73b0&#xff0c;BDP \u8c03\u4f18\u3001join \u7684 gate \u6570\u4e0e\u5e76\u884c\u5ea6\u6269\u5f20\u4e09\u8005\u5f80\u5f80\u4e0d\u53ef\u517c\u5f97\u2014\u2014\u5148\u628a\u4e58\u6570\u548c\u7ea6\u675f\u7b97\u6e05\u695a&#xff0c;\u518d\u52a8\u9884\u7b97\u3002<br \/>\n\u5ef6\u4f38\u9605\u8bfb&#xff1a;Flink \u5b98\u65b9\u6587\u6863 Set up TaskManager Memory&#xff08;\u5185\u5b58\u6a21\u578b\u7684\u6743\u5a01\u5b9a\u4e49&#xff09;&#xff1b;FLIP-49&#xff08;\u7edf\u4e00\u5185\u5b58\u914d\u7f6e\u7684\u8bbe\u8ba1\u52a8\u673a&#xff09;&#xff1b;Memory Management Improvements with Apache Flink 1.10&#xff08;\u6a21\u578b\u89e3\u8bfb&#xff09;&#xff1b;Using RocksDB State Backend&#xff08;write-buffer-ratio \u4e0e\u8c03\u4f18&#xff09;&#xff1b;Flink Serialization Tuning Vol. 1&#xff08;\u5e8f\u5217\u5316\u9636\u68af\u4e0e\u56de\u9000\u68c0\u6d4b&#xff09;&#xff1b;Flink Network Stack Vol. 2&#xff08;outPool\/inPool 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