{"id":1523,"date":"2020-06-08T16:31:39","date_gmt":"2020-06-08T08:31:39","guid":{"rendered":"http:\/\/39.97.231.10\/?p=1523"},"modified":"2020-06-08T16:31:39","modified_gmt":"2020-06-08T08:31:39","slug":"kafka-client-api%e4%bd%bf%e7%94%a8%e4%bb%8b%e7%bb%8d","status":"publish","type":"post","link":"http:\/\/www.weijing.co\/?p=1523","title":{"rendered":"Kafka Client API \u4f7f\u7528\u4ecb\u7ecd"},"content":{"rendered":"<div class=\\\"rEsl9f\\\">\n<div class=\\\"_2mYfmT\\\">\n<div>\n<div class=\\\"s-dsoj\\\"><span style=\\\"font-size: 1rem;\\\">\u8981\u4f7f\u7528Kafka Client\u7684API\uff0c\u9996\u5148\u9700\u8981\u5148\u90e8\u7f72Kafka\u96c6\u7fa4\uff0c\u90e8\u7f72\u8fc7\u7a0b\u8bf7\u53c2\u89c1[\u5b98\u7f51][2]\u3002\u7136\u540e\u5728\u9879\u76ee\u4e2d\u6dfb\u52a0Kafka Client\u7684\u4f9d\u8d56\uff0c\u5728\u8fd9\u91cc\u6211\u4eec\u4f7f\u75280.10.0.1\u7248\u672c\uff1a<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<article class=\\\"_2rhmJa\\\">\n<div>\n<pre>&lt;dependency&gt;\n    &lt;groupId&gt;org.apache.kafka&lt;\/groupId&gt;\n    &lt;artifactId&gt;kafka-clients&lt;\/artifactId&gt;\n    &lt;version&gt;0.10.0.1&lt;\/version&gt;\n&lt;\/dependency&gt;\n<\/pre>\n<\/div>\n<p>Kafka\u6709\u4ee5\u4e0b\u56db\u4e2a\u6838\u5fc3API\uff1a<\/p>\n<ul>\n<li>Producer<\/li>\n<li>Consumer<\/li>\n<li>Streams<\/li>\n<li>Connect<\/li>\n<\/ul>\n<p>\u8fd9\u91cc\u6211\u4eec\u6765\u8bb2\u89e3\u6bd4\u8f83\u57fa\u7840\u7684Producer\u548cConsumer\u3002\u5047\u8bbe\u8bfb\u8005\u5df2\u7ecf\u6309\u7167[\u5b98\u7f51][2]\u5728\u672c\u673a\u914d\u7f6e\u597d\u4e86Kafka\u670d\u52a1\uff0c\u5e76\u521b\u5efa\u4e86\u540d\u4e3a\u201ctest\u201d\u7684topic\u3002<\/p>\n<h2>Producer API<\/h2>\n<p>Producer\u7528\u6765\u5411Kafka\u96c6\u7fa4\u4e2d\u53d1\u5e03\u6d88\u606f\u8bb0\u5f55\u7684Kafka\u5ba2\u6237\u7aef\u3002Producer\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u5e76\u4e14\u901a\u5e38\u6765\u8bb2\uff0c\u5728\u591a\u4e2a\u7ebf\u7a0b\u95f4\u5171\u4eab\u4e00\u4e2aproducer\u8981\u6bd4\u6bcf\u4e2a\u7ebf\u7a0b\u90fd\u521b\u5efa\u4e00\u4e2aproducer\u901f\u5ea6\u66f4\u5feb\u3002Producer\u7684API\u76f8\u5bf9\u6bd4\u8f83\u7b80\u5355\uff0c\u4e0b\u9762\u7ed9\u51fa\u4e00\u4e2a\u8f83\u4e3a\u7b80\u5355\u7684API\u5b9e\u4f8b\uff1a<\/p>\n<div>\n<pre>import java.util.Properties;\nimport org.apache.kafka.clients.producer.KafkaProducer;\nimport org.apache.kafka.clients.producer.Producer;\nimport org.apache.kafka.clients.producer.ProducerRecord;\npublic class ProducerDemo {\n    public static void main(String[] args) {\n        Properties props = new Properties();\n        props.put(\\\"bootstrap.servers\\\", \\\"localhost:9092\\\");\n                props.put(\\\"acks\\\", \\\"all\\\");\n                props.put(\\\"retries\\\", 0);\n                props.put(\\\"batch.size\\\", 16384);\n                props.put(\\\"linger.ms\\\", 1);\n                props.put(\\\"buffer.memory\\\", 33554432);\n        props.put(\\\"key.serializer\\\", \\\"org.apache.kafka.common.serialization.StringSerializer\\\");\n        props.put(\\\"value.serializer\\\", \\\"org.apache.kafka.common.serialization.StringSerializer\\\");\n        Producer&lt;String, String&gt; producer = new KafkaProducer&lt;&gt;(props);\n        for (int i = 0; i &lt; 100; i++)\n            producer.send(new ProducerRecord&lt;String, String&gt;(\\\"test\\\", Integer.toString(i), Integer.toString(i)));\n        producer.close();\n    }\n}\n<\/pre>\n<\/div>\n<p>Producer\u7531\u4e00\u4e2a\u6301\u6709\u672a\u53d1\u9001\u6d88\u606f\u8bb0\u5f55\u7684\u8d44\u6e90\u6c60\u548c\u4e00\u4e2a\u7528\u6765\u5411Kafka\u96c6\u7fa4\u53d1\u9001\u6d88\u606f\u8bb0\u5f55\u7684\u540e\u53f0IO\u7ebf\u7a0b\u7ec4\u6210\u3002\u4f7f\u7528\u540e\u672a\u5173\u95edproducer\u5c06\u5bfc\u81f4\u8fd9\u4e9b\u8d44\u6e90\u6cc4\u9732\u3002<br \/>\nsend\u65b9\u6cd5\u662f\u5f02\u6b65\u7684\u3002\u5f53\u5b83\u88ab\u8c03\u7528\u65f6\uff0c\u5b83\u4f1a\u5c06\u6d88\u606f\u8bb0\u5f55\u6dfb\u52a0\u5230\u5f85\u53d1\u9001\u7f13\u51b2\u533a\u5e76\u7acb\u5373\u8fd4\u56de\u3002\u4f7f\u7528\u8fd9\u79cd\u65b9\u5f0f\u53ef\u4ee5\u4f7f\u751f\u4ea7\u8005\u805a\u96c6\u4e00\u6279\u6d88\u606f\u8bb0\u5f55\u540e\u4e00\u8d77\u53d1\u9001\uff0c\u4ece\u800c\u63d0\u9ad8\u6548\u7387\u3002<br \/>\nack \u914d\u7f6e\u9879\u7528\u6765\u63a7\u5236producer\u8981\u6c42leader\u786e\u8ba4\u591a\u5c11\u6d88\u606f\u540e\u8fd4\u56de\u8c03\u7528\u6210\u529f\u3002\u5f53\u503c\u4e3a0\u65f6producer\u4e0d\u9700\u8981\u7b49\u5f85\u4efb\u4f55\u786e\u8ba4\u6d88\u606f\u3002\u5f53\u503c\u4e3a1\u65f6\u53ea\u9700\u8981\u7b49\u5f85leader\u786e\u8ba4\u3002\u5f53\u503c\u4e3a-1\u6216all\u65f6\u9700\u8981\u5168\u90e8ISR\u96c6\u5408\u8fd4\u56de\u786e\u8ba4\u624d\u53ef\u4ee5\u8fd4\u56de\u6210\u529f\u3002<br \/>\n\u5f53 retries &gt; 0 \u65f6\uff0c\u5982\u679c\u53d1\u9001\u5931\u8d25\uff0c\u4f1a\u81ea\u52a8\u5c1d\u8bd5\u91cd\u65b0\u53d1\u9001\u6570\u636e\u3002\u53d1\u9001\u6b21\u6570\u4e3aretries\u8bbe\u7f6e\u7684\u503c\u3002<br \/>\nbuffer.memory\u3001batch.size\u3001linger.ms\u4e09\u4e2a\u53c2\u6570\u7528\u6765\u63a7\u5236\u7f13\u51b2\u533a\u5927\u5c0f\u548c\u5ef6\u8fdf\u53d1\u9001\u65f6\u95f4\uff0c\u5177\u4f53\u542b\u4e49\u53ef\u4ee5\u53c2\u8003\u5b98\u65b9\u6587\u6863\u7684\u914d\u7f6e\u3002<br \/>\nbootstrap.servers \u914d\u7f6e\u9879\u5904\u9700\u8981\u586b\u5199\u6211\u4eec\u8981\u53d1\u9001\u5230\u7684Kafka\u96c6\u7fa4\u5730\u5740\u3002<br \/>\nkey.serializer \u548c value.serializer \u6307\u5b9a\u4f7f\u7528\u4ec0\u4e48\u5e8f\u5217\u5316\u65b9\u5f0f\u5c06\u7528\u6237\u63d0\u4f9b\u7684key\u548cvalue\u8fdb\u884c\u5e8f\u5217\u5316\u3002<br \/>\n\u8fd0\u884c\u6b64\u7a0b\u5e8f\uff0c\u5728$KAFKA_HOME\u76ee\u5f55\u4e0b\u8fd0\u884c\uff1a<\/p>\n<div class=\\\"_2Uzcx_\\\">\n<pre>bin\/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic test --from-beginning\n<\/pre>\n<\/div>\n<p>\u53ef\u4ee5\u770b\u5230\u5199\u5165Kafka\u7684\u6d88\u606f\u3002<\/p>\n<h2>Consumer API<\/h2>\n<p>Consumer\u7684API\u5206\u4e3aHigh-level API\u548cLow-level API\u3002\u524d\u8005\u63d0\u4f9b\u4e86\u9ad8\u5ea6\u62bd\u8c61\u7684API\uff0c\u4f7f\u7528\u8d77\u6765\u7b80\u5355\u3001\u65b9\u4fbf\u3002\u56e0\u6b64\u672c\u6587\u5c06\u4e3b\u8981\u8bb2\u8ff0High-level API\u3002Low-level API\u63d0\u4f9b\u4e86\u66f4\u5f3a\u7684\u63a7\u5236\u80fd\u529b\uff0c\u4f46\u4f7f\u7528\u8d77\u6765\u8f83\u4e3a\u7e41\u7410\u3002\u4e0b\u9762\u6211\u4eec\u6765\u770b\u4e00\u79cd\u6700\u7b80\u5355\u7684\u65b9\u5f0f\uff0c\u81ea\u52a8\u786e\u8ba4offset\uff1a<\/p>\n<div class=\\\"_2Uzcx_\\\">\n<pre class=\\\"line-numbers  language-tsx\\\">import java.util.Arrays;\nimport java.util.Properties;\nimport org.apache.kafka.clients.consumer.ConsumerRecord;\nimport org.apache.kafka.clients.consumer.ConsumerRecords;\nimport org.apache.kafka.clients.consumer.KafkaConsumer;\npublic class AutoCommitConsumerDemo {\n    public static void main(String[] args) {\n         Properties props = new Properties();\n         props.put(\\\"bootstrap.servers\\\", \\\"localhost:9092\\\");\n         props.put(\\\"group.id\\\", \\\"test\\\");\n         props.put(\\\"enable.auto.commit\\\", \\\"true\\\");\n         props.put(\\\"auto.commit.interval.ms\\\", \\\"1000\\\");\n         props.put(\\\"key.deserializer\\\", \\\"org.apache.kafka.common.serialization.StringDeserializer\\\");\n         props.put(\\\"value.deserializer\\\", \\\"org.apache.kafka.common.serialization.StringDeserializer\\\");\n         @SuppressWarnings(\\\"resource\\\")\n        KafkaConsumer&lt;String, String&gt; consumer = new KafkaConsumer&lt;&gt;(props);\n         consumer.subscribe(Arrays.asList(\\\"test\\\"));\n         while (true) {\n             ConsumerRecords&lt;String, String&gt; records = consumer.poll(100);\n             for (ConsumerRecord&lt;String, String&gt; record : records)\n                 System.out.printf(\\\"offset = %d, key = %s, value = %s%n\\\", record.offset(), record.key(), record.value());\n         }\n    }\n}<\/pre>\n<\/div>\n<p>bootstrap.servers\u914d\u7f6e\u9879\u6307\u5b9a\u4e86consumer\u9700\u8981\u8fde\u63a5\u7684\u670d\u52a1\u5668\u96c6\u7fa4\u3002\u591a\u53f0\u670d\u52a1\u5668\u7528\u201c,\u201d\u5206\u9694\u3002\u8fd9\u4e2a\u914d\u7f6e\u9879\u5c31\u7b97\u53ea\u914d\u7f6e\u4e86\u4e00\u53f0server\u7684\u5730\u5740\uff0c\u4e5f\u53ef\u4ee5\u901a\u8fc7\u8fd9\u4e00\u53f0server\u53d1\u73b0\u96c6\u7fa4\u4e2d\u7684\u5176\u4ed6\u670d\u52a1\u5668\u3002\u4f46\u662f\u4e3a\u4e86\u907f\u514d\u8fd9\u53f0server\u6302\u6389\u5f15\u53d1\u5355\u70b9\u95ee\u9898\uff0c\u6240\u4ee5\u628a\u6240\u6709\u670d\u52a1\u5668\u5730\u5740\u5217\u4e3e\u4e0a\u53bb\u662f\u4e00\u4e2a\u6bd4\u8f83\u597d\u7684\u9009\u62e9\u3002<br \/>\nenable.auto.commit\u914d\u7f6e\u9879\u6307\u5b9a\u4e86\u63d0\u4ea4offset\u7684\u65b9\u5f0f\u4e3a\u81ea\u52a8\u63d0\u4ea4\uff0cauto.commit.interval.ms\u914d\u7f6e\u9879\u914d\u7f6e\u4e86\u6bcf\u6b21\u81ea\u52a8\u63d0\u4ea4\u7684\u65f6\u95f4\u95f4\u9694\u3002<br \/>\ngroup.id\u5373\u6d88\u8d39\u8005\u7ec4\u6807\u7b7e\uff0c\u672c\u4f8b\u4e2d\u6d88\u8d39\u8005\u7ec4\u7684\u540d\u79f0\u4e3atest\u3002\u4e0d\u4e86\u89e3\u6d88\u8d39\u8005\u7ec4\u7684\u6982\u5ff5\u53ef\u4ee5\u770b\u6211\u7684\u8fd9\u7bc7\u6587\u7ae0\uff1a[Kafka\u57fa\u672c\u6982\u5ff5\u53ca\u539f\u7406][1]\u3002<br \/>\n\u81ea\u52a8\u63d0\u4ea4offset\u7684\u65b9\u5f0f\u975e\u5e38\u7b80\u5355\uff0c\u4f46\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u4e0d\u4f1a\u4f7f\u7528\u81ea\u52a8\u63d0\u4ea4\u7684\u65b9\u5f0f\u3002\u56e0\u4e3a\u4e0d\u8bba\u4eceKafka\u96c6\u7fa4\u4e2d\u62c9\u53d6\u7684\u6570\u636e\u662f\u5426\u88ab\u5904\u7406\u6210\u529f\uff0coffset\u90fd\u4f1a\u88ab\u66f4\u65b0\uff0c\u4e5f\u5c31\u662f\u5982\u679c\u5904\u7406\u8fc7\u7a0b\u4e2d\u51fa\u73b0\u9519\u8bef\u53ef\u80fd\u4f1a\u51fa\u73b0\u6570\u636e\u4e22\u5931\u7684\u60c5\u51b5\u3002\u6240\u4ee5\u591a\u6570\u60c5\u51b5\u4e0b\u6211\u4eec\u4f1a\u9009\u62e9\u624b\u52a8\u63d0\u4ea4\u65b9\u5f0f\uff1a<\/p>\n<div>\n<pre>import java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.List;\nimport java.util.Properties;\nimport org.apache.kafka.clients.consumer.ConsumerRecord;\nimport org.apache.kafka.clients.consumer.ConsumerRecords;\nimport org.apache.kafka.clients.consumer.KafkaConsumer;\npublic class ManualCommitConsumerDemo {\n    public static void main(String[] args) {\n         Properties props = new Properties();\n         props.put(\\\"bootstrap.servers\\\", \\\"localhost:9092\\\");\n         props.put(\\\"group.id\\\", \\\"test\\\");\n         props.put(\\\"enable.auto.commit\\\", \\\"false\\\");\n         props.put(\\\"key.deserializer\\\", \\\"org.apache.kafka.common.serialization.StringDeserializer\\\");\n         props.put(\\\"value.deserializer\\\", \\\"org.apache.kafka.common.serialization.StringDeserializer\\\");\n         @SuppressWarnings(\\\"resource\\\")\n         KafkaConsumer&lt;String, String&gt; consumer = new KafkaConsumer&lt;&gt;(props);\n         consumer.subscribe(Arrays.asList(\\\"foo\\\", \\\"bar\\\"));\n         final int minBatchSize = 200;\n         List&lt;ConsumerRecord&lt;String, String&gt;&gt; buffer = new ArrayList&lt;&gt;();\n         while (true) {\n             ConsumerRecords&lt;String, String&gt; records = consumer.poll(100);\n             for (ConsumerRecord&lt;String, String&gt; record : records) {\n                 buffer.add(record);\n             }\n             if (buffer.size() &gt;= minBatchSize) {\n                 insertIntoDb(buffer);\n                 consumer.commitSync();\n                 buffer.clear();\n             }\n         }\n    }\n    private static void insertIntoDb(List&lt;ConsumerRecord&lt;String, String&gt;&gt; buffer) {\n        \/\/ Insert into db\n    }\n}\n<\/pre>\n<\/div>\n<p>\u4ece\u5bf9\u6bd4\u81ea\u52a8\u63d0\u4ea4offset\u7684\u4ee3\u7801\uff0c\u6211\u4eec\u770b\u5230 enable.auto.commit \u914d\u7f6e\u9879\u88ab\u8bbe\u7f6e\u4e3afalse\uff0c\u4ee3\u8868\u624b\u52a8\u63d0\u4ea4\u3002\u4ee3\u7801\u4e2d\u5b9a\u4e49\u4e86\u4e00\u4e2aConsumerRecord\u7684\u5217\u8868\u4f5c\u4e3a\u7f13\u51b2\uff0c\u5f53\u7f13\u51b2\u4e2d\u7684\u6570\u636e\u5927\u4e8e200\u6761\u65f6\uff0c\u624d\u4e00\u6b21\u6027\u63d2\u5165\u6570\u636e\u5e93\u4e2d\uff0c\u5e76\u624b\u52a8\u63d0\u4ea4offset\u3002\u8fd9\u6837\uff0c\u53ea\u6709\u5f53\u6570\u636e\u6210\u529f\u63d2\u5165\u6570\u636e\u5e93\u65f6\u624d\u4f1a\u66f4\u65b0offset\uff0c\u4ece\u800c\u4fdd\u8bc1\u4e86\u6570\u636e\u4e0d\u4e22\u5931\u3002\u4f46\u5982\u679c\u5728\u6570\u636e\u63d2\u5165\u6570\u636e\u5e93\u540e\u548c\u624b\u52a8\u63d0\u4ea4offset\u4e4b\u95f4\u8fd9\u6bb5\u65f6\u95f4\uff08\u867d\u7136\u5f88\u77ed\uff0c\u4f46\u4e5f\u662f\u6709\u53ef\u80fd\u7684\uff09\u7a0b\u5e8f\u5d29\u6e83\u6216\u670d\u52a1\u5668down\u673a\uff0c\u90a3\u4e48\u518d\u6b21\u542f\u52a8\u4f1a\u5bfc\u81f4\u91cd\u590d\u6d88\u8d39\u3002\u6240\u4ee5\u8fd9\u79cd\u65b9\u5f0f\u5176\u5b9e\u662f\u63d0\u4f9b\u4e86 at least once \u8bed\u4e49\u3002<br \/>\n\u53e6\u5916\uff0cconsumer\u5e76\u4e0d\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u6240\u4ee5\u5728\u8fdb\u884c\u591a\u7ebf\u7a0b\u64cd\u4f5c\u65f6\u9700\u8981\u5728\u6bcf\u4e2a\u7ebf\u7a0b\u5b9e\u4f8b\u5316\u4e00\u4e2aconsumer\u3002\u5982\u679c\u9700\u8981\u8de8\u7ebf\u7a0b\u4f7f\u7528consumer\uff0c\u9700\u8981\u8fdb\u884c\u624b\u52a8\u540c\u6b65\u3002<br \/>\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>\u8981\u4f7f\u7528Kafka Client\u7684API\uff0c\u9996\u5148\u9700\u8981\u5148\u90e8\u7f72Kafka\u96c6\u7fa4\uff0c\u90e8\u7f72\u8fc7\u7a0b\u8bf7\u53c2\u89c1[\u5b98\u7f51][2]\u3002\u7136\u540e\u5728\u9879\u76ee &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"http:\/\/www.weijing.co\/?p=1523\"> <span class=\"screen-reader-text\">Kafka Client API \u4f7f\u7528\u4ecb\u7ecd<\/span> \u67e5\u770b\u5168\u6587 &raquo;<\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":""},"categories":[127,118],"tags":[],"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false,"mailpoet_newsletter_max":false,"woocommerce_thumbnail":false,"woocommerce_single":false,"woocommerce_gallery_thumbnail":false,"shop_catalog":false,"shop_single":false,"shop_thumbnail":false},"uagb_author_info":{"display_name":"weijing","author_link":"http:\/\/www.weijing.co\/?author=4"},"uagb_comment_info":0,"uagb_excerpt":"\u8981\u4f7f\u7528Kafka 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