{"id":18814,"date":"2024-03-16T10:06:41","date_gmt":"2024-03-16T01:06:41","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/flink%e3%81%af%e3%80%81kafka%e3%81%8b%e3%82%89%e3%83%87%e3%83%bc%e3%82%bf%e3%82%92%e8%aa%ad%e3%81%bf%e8%be%bc%e3%82%93%e3%81%a7%e7%b5%b1%e8%a8%88%e3%82%92%e8%a1%8c%e3%81%86%e6%96%b9%e6%b3%95%e3%81%af\/"},"modified":"2025-08-06T18:18:34","modified_gmt":"2025-08-06T09:18:34","slug":"flink%e3%81%af%e3%80%81kafka%e3%81%8b%e3%82%89%e3%83%87%e3%83%bc%e3%82%bf%e3%82%92%e8%aa%ad%e3%81%bf%e8%be%bc%e3%82%93%e3%81%a7%e7%b5%b1%e8%a8%88%e3%82%92%e8%a1%8c%e3%81%86%e6%96%b9%e6%b3%95%e3%81%af","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/flink%e3%81%af%e3%80%81kafka%e3%81%8b%e3%82%89%e3%83%87%e3%83%bc%e3%82%bf%e3%82%92%e8%aa%ad%e3%81%bf%e8%be%bc%e3%82%93%e3%81%a7%e7%b5%b1%e8%a8%88%e3%82%92%e8%a1%8c%e3%81%86%e6%96%b9%e6%b3%95%e3%81%af\/","title":{"rendered":"flink\u306f\u3001kafka\u304b\u3089\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u8fbc\u3093\u3067\u7d71\u8a08\u3092\u884c\u3046\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f"},"content":{"rendered":"<p>Flink\u3067\u306f\u3001FlinkKafkaConsumer\u3092\u4f7f\u7528\u3057\u3066Kafka\u304b\u3089\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u53d6\u308a\u3001\u96c6\u8a08\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u3001FlinkKafkaConsumer\u3068KeyedStream\u3092\u4f7f\u7528\u3057\u3066\u3001Kafka\u30c7\u30fc\u30bf\u306e\u5404\u30ad\u30fc\u306e\u6570\u3092\u7d71\u8a08\u3059\u308b\u65b9\u6cd5\u3092\u793a\u3057\u305f\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u3059\u3002<\/p>\n<p>\u6700\u521d\u306b\u3001\u95a2\u9023\u3059\u308b\u4f9d\u5b58\u95a2\u4fc2\u3092\u5c0e\u5165\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">dependency<\/span>&gt;<\/span>\r\n    <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">groupId<\/span>&gt;<\/span>org.apache.flink<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">groupId<\/span>&gt;<\/span>\r\n    <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">artifactId<\/span>&gt;<\/span>flink-streaming-java_2.11<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">artifactId<\/span>&gt;<\/span>\r\n    <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">version<\/span>&gt;<\/span>${flink.version}<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">version<\/span>&gt;<\/span>\r\n<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">dependency<\/span>&gt;<\/span>\r\n<span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">dependency<\/span>&gt;<\/span>\r\n    <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">groupId<\/span>&gt;<\/span>org.apache.flink<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">groupId<\/span>&gt;<\/span>\r\n    <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">artifactId<\/span>&gt;<\/span>flink-connector-kafka_2.11<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">artifactId<\/span>&gt;<\/span>\r\n    <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">version<\/span>&gt;<\/span>${flink.version}<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">version<\/span>&gt;<\/span>\r\n<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">dependency<\/span>&gt;<\/span>\r\n<\/code><\/pre>\n<p>\u305d\u306e\u5f8c\u3001\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066Kafka\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u53d6\u308a\u3001\u96c6\u8a08\u3067\u304d\u307e\u3059\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> org.apache.flink.api.java.tuple.Tuple2;\r\n<span class=\"hljs-keyword\">import<\/span> org.apache.flink.streaming.api.datastream.DataStream;\r\n<span class=\"hljs-keyword\">import<\/span> org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;\r\n<span class=\"hljs-keyword\">import<\/span> org.apache.flink.streaming.api.functions.KeyedProcessFunction;\r\n<span class=\"hljs-keyword\">import<\/span> org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer;\r\n<span class=\"hljs-keyword\">import<\/span> org.apache.flink.util.Collector;\r\n\r\n<span class=\"hljs-keyword\">import<\/span> java.util.Properties;\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">KafkaDataStatistics<\/span> {\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">(String[] args)<\/span> <span class=\"hljs-keyword\">throws<\/span> Exception {\r\n        <span class=\"hljs-comment\">\/\/ \u8bbe\u7f6e\u6267\u884c\u73af\u5883<\/span>\r\n        <span class=\"hljs-type\">StreamExecutionEnvironment<\/span> <span class=\"hljs-variable\">env<\/span> <span class=\"hljs-operator\">=<\/span> StreamExecutionEnvironment.getExecutionEnvironment();\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u914d\u7f6eKafka\u8fde\u63a5\u76f8\u5173\u4fe1\u606f<\/span>\r\n        <span class=\"hljs-type\">Properties<\/span> <span class=\"hljs-variable\">props<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Properties<\/span>();\r\n        props.setProperty(<span class=\"hljs-string\">\"bootstrap.servers\"<\/span>, <span class=\"hljs-string\">\"localhost:9092\"<\/span>);\r\n        props.setProperty(<span class=\"hljs-string\">\"group.id\"<\/span>, <span class=\"hljs-string\">\"flink-consumer\"<\/span>);\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u4eceKafka\u8bfb\u53d6\u6570\u636e<\/span>\r\n        FlinkKafkaConsumer&lt;String&gt; kafkaConsumer = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">FlinkKafkaConsumer<\/span>&lt;&gt;(<span class=\"hljs-string\">\"topic\"<\/span>, <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">SimpleStringSchema<\/span>(), props);\r\n        DataStream&lt;String&gt; kafkaStream = env.addSource(kafkaConsumer);\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u5bf9\u6570\u636e\u8fdb\u884c\u7edf\u8ba1<\/span>\r\n        DataStream&lt;Tuple2&lt;String, Integer&gt;&gt; result = kafkaStream\r\n                .keyBy(value -&gt; value) <span class=\"hljs-comment\">\/\/ \u6839\u636e\u952e\u5206\u7ec4<\/span>\r\n                .process(<span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">CountProcessFunction<\/span>());\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u6253\u5370\u7ed3\u679c<\/span>\r\n        result.print();\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u6267\u884c\u7a0b\u5e8f<\/span>\r\n        env.execute(<span class=\"hljs-string\">\"Kafka Data Statistics\"<\/span>);\r\n    }\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u81ea\u5b9a\u4e49ProcessFunction\u8fdb\u884c\u7edf\u8ba1<\/span>\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">CountProcessFunction<\/span> <span class=\"hljs-keyword\">extends<\/span> <span class=\"hljs-title class_\">KeyedProcessFunction<\/span>&lt;String, String, Tuple2&lt;String, Integer&gt;&gt; {\r\n        <span class=\"hljs-keyword\">private<\/span> ValueState&lt;Integer&gt; countState;\r\n\r\n        <span class=\"hljs-meta\">@Override<\/span>\r\n        <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">open<\/span><span class=\"hljs-params\">(Configuration parameters)<\/span> <span class=\"hljs-keyword\">throws<\/span> Exception {\r\n            ValueStateDescriptor&lt;Integer&gt; countDescriptor = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">ValueStateDescriptor<\/span>&lt;&gt;(<span class=\"hljs-string\">\"count\"<\/span>, Integer.class);\r\n            countState = getRuntimeContext().getState(countDescriptor);\r\n        }\r\n\r\n        <span class=\"hljs-meta\">@Override<\/span>\r\n        <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">processElement<\/span><span class=\"hljs-params\">(String value, Context ctx, Collector&lt;Tuple2&lt;String, Integer&gt;&gt; out)<\/span> <span class=\"hljs-keyword\">throws<\/span> Exception {\r\n            <span class=\"hljs-type\">Integer<\/span> <span class=\"hljs-variable\">count<\/span> <span class=\"hljs-operator\">=<\/span> countState.value();\r\n            <span class=\"hljs-keyword\">if<\/span> (count == <span class=\"hljs-literal\">null<\/span>) {\r\n                count = <span class=\"hljs-number\">0<\/span>;\r\n            }\r\n            count++;\r\n            countState.update(count);\r\n            out.collect(<span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Tuple2<\/span>&lt;&gt;(ctx.getCurrentKey(), count));\r\n        }\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001FlinkKafkaConsumer\u304cKafka\u304b\u3089\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u53d6\u308a\u3001\u305d\u308c\u3092DataStream\u306b\u5909\u63db\u3057\u307e\u3059\u3002\u305d\u306e\u5f8c\u3001keyBy\uff08\uff09\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30c7\u30fc\u30bf\u3092\u30ad\u30fc\u3067\u30b0\u30eb\u30fc\u30d7\u5316\u3057\u307e\u3059\u3002\u6b21\u306b\u3001\u30ab\u30b9\u30bf\u30e0\u306eKeyedProcessFunction\u3092\u4f7f\u7528\u3057\u3066\u7d71\u8a08\u3092\u884c\u3044\u3001\u7d71\u8a08\u7d50\u679c\u3092DataStream\u306b\u51fa\u529b\u3057\u307e\u3059\u3002\u6700\u5f8c\u306b\u3001print\uff08\uff09\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u7d50\u679c\u3092\u51fa\u529b\u3057\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002<\/p>\n<p>\u4e0a\u8a18\u306e\u4f8b\u3067\u306f\u5358\u7d14\u306a\u7d71\u8a08\u306e\u4f8b\u304c\u793a\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u5b9f\u969b\u306e\u30cb\u30fc\u30ba\u306b\u5408\u308f\u305b\u3066\u3001\u30c7\u30fc\u30bf\u5f62\u5f0f\u3084\u7d71\u8a08\u30ed\u30b8\u30c3\u30af\u306b\u9069\u5207\u306a\u8abf\u6574\u304c\u5fc5\u8981\u306b\u306a\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Flink\u3067\u306f\u3001FlinkKafkaConsumer\u3092\u4f7f\u7528\u3057\u3066Kafka\u304b\u3089\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u53d6\u308a\u3001\u96c6\u8a08\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u3001FlinkKafkaConsumer\u3068KeyedStream\u3092\u4f7f\u7528\u3057\u3066\u3001Kafka\u30c7\u30fc\u30bf\u306e\u5404\u30ad [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-18814","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>flink\u306f\u3001kafka\u304b\u3089\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u8fbc\u3093\u3067\u7d71\u8a08\u3092\u884c\u3046\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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