{"id":786,"date":"2023-08-17T09:55:36","date_gmt":"2023-08-17T01:55:36","guid":{"rendered":"https:\/\/zhaocunwei.co.uk\/?p=786"},"modified":"2023-08-17T10:01:36","modified_gmt":"2023-08-17T02:01:36","slug":"kafka-2","status":"publish","type":"post","link":"https:\/\/zhaocunwei.co.uk\/index.php\/2023\/08\/17\/kafka-2\/","title":{"rendered":"kafka\u5e95\u5c42\u5b9e\u73b0\uff0c\u65e5\u5fd7\u5b58\u50a8\u673a\u5236\u3001\u504f\u79fb\u91cf\u3001\u4e3b\u9898\u8ba2\u9605\u548c\u6545\u969c\u53d1\u73b0"},"content":{"rendered":"

\u524d\u8a00<\/h1>\n

Apache Kafka\u662f\u4e00\u4e2a\u5206\u5e03\u5f0f\u6d41\u5904\u7406\u5e73\u53f0\uff0c\u4e3b\u8981\u7528\u4e8e\u6784\u5efa\u5b9e\u65f6\u6570\u636e\u6d41\u5e94\u7528\u548c\u6570\u636e\u7ba1\u9053\u3002\u5b83\u7684\u5e95\u5c42\u5b9e\u73b0\u6d89\u53ca\u591a\u4e2a\u65b9\u9762\uff0c\u5305\u62ec\u65e5\u5fd7\u5b58\u50a8\u673a\u5236\u3001\u504f\u79fb\u91cf\u7ba1\u7406\u3001\u4e3b\u9898\u8ba2\u9605\u548c\u6545\u969c\u53d1\u73b0\u7b49\u3002\u4e0b\u9762\u6211\u5c06\u4e3a\u4f60\u8be6\u7ec6\u4ecb\u7ecd\u6bcf\u4e2a\u65b9\u9762\uff0c\u5e76\u63d0\u4f9b\u76f8\u5173\u7684\u4ee3\u7801\u6848\u4f8b\u548c\u6545\u969c\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n

\u65e5\u5fd7\u5b58\u50a8\u673a\u5236\uff1a<\/h1>\n

Kafka\u4f7f\u7528\u65e5\u5fd7\u5b58\u50a8\u673a\u5236\u6765\u6301\u4e45\u5316\u6d88\u606f\u3002\u6bcf\u4e2a\u4e3b\u9898\u7684\u6d88\u606f\u90fd\u4f1a\u88ab\u8ffd\u52a0\u5230\u4e00\u4e2a\u6216\u591a\u4e2a\u5206\u533a\u7684\u65e5\u5fd7\u6587\u4ef6\u4e2d\u3002\u65e5\u5fd7\u6587\u4ef6\u7684\u547d\u540d\u65b9\u5f0f\u4e3a\u2018-.log\u2019\u3002\u6d88\u606f\u6309\u987a\u5e8f\u8ffd\u52a0\u5230\u6587\u4ef6\u4e2d\uff0c\u800c\u4e14\u6bcf\u4e2a\u6d88\u606f\u90fd\u6709\u4e00\u4e2a\u552f\u4e00\u7684\u504f\u79fb\u91cf\u3002<\/p>\n

\u6bcf\u4e2a\u5206\u533a\u90fd\u6709\u4e00\u4e2a\u5bf9\u5e94\u7684\u65e5\u5fd7\u6bb5\uff08log segment\uff09\uff0c\u5f53\u4e00\u4e2a\u65e5\u5fd7\u6bb5\u8fbe\u5230\u4e00\u5b9a\u5927\u5c0f\u9650\u5236\uff08\u901a\u8fc7\u914d\u7f6e\u9879log.segment.bytes\u6307\u5b9a\uff09\uff0c\u5c31\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u65e5\u5fd7\u6bb5\uff0c\u5e76\u4e14\u65e7\u7684\u65e5\u5fd7\u6bb5\u4f1a\u88ab\u5173\u95ed\uff0c\u4e0d\u518d\u63a5\u6536\u65b0\u6d88\u606f\u3002\u8fd9\u6837\u53ef\u4ee5\u63d0\u9ad8\u5199\u5165\u6027\u80fd\uff0c\u5e76\u5141\u8bb8\u540e\u53f0\u7684\u65e5\u5fd7\u6bb5\u538b\u7f29\u548c\u6e05\u7406\u64cd\u4f5c\u3002<\/p>\n

\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b\u4ee3\u7801\uff0c\u6f14\u793a\u5982\u4f55\u4f7f\u7528Kafka Producer\u5c06\u6d88\u606f\u53d1\u9001\u5230\u4e3b\u9898\uff1a<\/p>\n

import org.apache.kafka.clients.producer.*;\npublic class KafkaProducerExample {\n    public static void main(String[] args) {\n        Properties props = new Properties();\n        props.put("bootstrap.servers", "localhost:9092");\n        props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");\n        props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");\n        Producer<String, String> producer = new KafkaProducer<>(props);\n        String topic = "my-topic";\n        String message = "Hello, Kafka!";\n        ProducerRecord<String, String> record = new ProducerRecord<>(topic, message);\n        producer.send(record, new Callback() {\n            @Override\n            public void onCompletion(RecordMetadata metadata, Exception exception) {\n                if (exception == null) {\n                    System.out.println("Message sent successfully. Offset: " + metadata.offset());\n                } else {\n                    System.err.println("Error sending message: " + exception.getMessage());\n                }\n            }\n        });\n        producer.close();\n    }\n}<\/code><\/pre>\n
\u504f\u79fb\u91cf\u7ba1\u7406\uff1a<\/h1>\n
Kafka\u4f7f\u7528\u504f\u79fb\u91cf\uff08offset\uff09\u6765\u6807\u8bc6\u6d88\u8d39\u8005\u5728\u5206\u533a\u4e2d\u7684\u4f4d\u7f6e\u3002\u6bcf\u4e2a\u6d88\u8d39\u8005\u7ec4\u7ef4\u62a4\u7740\u6bcf\u4e2a\u5206\u533a\u7684\u504f\u79fb\u91cf\uff0c\u4ee5\u4fbf\u5728\u91cd\u65b0\u542f\u52a8\u540e\u80fd\u591f\u4ece\u6b63\u786e\u7684\u4f4d\u7f6e\u7ee7\u7eed\u6d88\u8d39\u3002<\/p>\n
\u504f\u79fb\u91cf\u53ef\u4ee5\u7531\u6d88\u8d39\u8005\u81ea\u4e3b\u7ba1\u7406\uff0c\u4e5f\u53ef\u4ee5\u7531Kafka\u81ea\u52a8\u7ba1\u7406\uff08\u901a\u8fc7\u914d\u7f6e\u9879enable.auto.commit\u548cauto.commit.interval.ms\uff09\u3002\u81ea\u52a8\u63d0\u4ea4\u504f\u79fb\u91cf\u53ef\u80fd\u4f1a\u5728\u6d88\u8d39\u8005\u5931\u8d25\u65f6\u5bfc\u81f4\u6d88\u606f\u91cd\u590d\u5904\u7406\u6216\u4e22\u5931\uff0c\u56e0\u6b64\u901a\u5e38\u5efa\u8bae\u4f7f\u7528\u624b\u52a8\u7ba1\u7406\u504f\u79fb\u91cf\u3002<\/p>\n
\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u6d88\u8d39\u8005\u793a\u4f8b\u4ee3\u7801\uff0c\u5c55\u793a\u5982\u4f55\u6d88\u8d39\u4e3b\u9898\u4e2d\u7684\u6d88\u606f\u5e76\u624b\u52a8\u7ba1\u7406\u504f\u79fb\u91cf\uff1a<\/p>\n
import org.apache.kafka.clients.consumer.*;\nimport java.time.Duration;\nimport java.util.Collections;\nimport java.util.Properties;\npublic class KafkaConsumerExample {\n    public static void main(String[] args) {\n        Properties props = new Properties();\n        props.put("bootstrap.servers", "localhost:9092");\n        props.put("group.id", "my-consumer-group");\n        props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");\n        props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");\n        props.put("auto.offset.reset", "earliest"); \/\/ Start from the beginning of the partition\n        KafkaConsumer<String, String> consumer = new KafkaConsumer<>(props);\n        String topic = "my-topic";\n        consumer.subscribe(Collections.singletonList(topic));\n        while (true) {\n            ConsumerRecords<String, String> records = consumer.poll(Duration.ofMillis(100));\n            for (ConsumerRecord<String, String> record : records) {\n                System.out.printf("Received message: key = %s, value = %s%n", record.key(), record.value());\n                \/\/ Manually commit the offset after processing the message\n                consumer.commitSync(Collections.singletonMap(record.topicPartition(), new OffsetAndMetadata(record.offset() + 1)));\n            }\n        }\n    }\n}<\/code><\/pre>\n
\u4e3b\u9898\u8ba2\u9605\u548c\u6545\u969c\u53d1\u73b0\uff1a<\/h1>\n
Kafka\u4e2d\u7684\u4e3b\u9898\u53ef\u4ee5\u6709\u591a\u4e2a\u5206\u533a\uff0c\u6bcf\u4e2a\u5206\u533a\u53ef\u4ee5\u5206\u5e03\u5728\u4e0d\u540c\u7684Broker\u4e0a\u3002\u6d88\u8d39\u8005\u53ef\u4ee5\u8ba2\u9605\u4e00\u4e2a\u6216\u591a\u4e2a\u4e3b\u9898\uff0c\u901a\u8fc7\u8ba2\u9605\u7684\u65b9\u5f0f\u6765\u6d88\u8d39\u6d88\u606f\u3002\u5f53\u4e3b\u9898\u7684\u5206\u533a\u53d1\u751f\u53d8\u5316\u6216Broker\u6545\u969c\u65f6\uff0cKafka\u4f1a\u81ea\u52a8\u8fdb\u884c\u91cd\u65b0\u5206\u914d\u5206\u533a\u548c\u91cd\u65b0\u5e73\u8861\u6d88\u8d39\u8005\u3002<\/p>\n
\u6545\u969c\u53d1\u73b0\u548c\u81ea\u52a8\u5e73\u8861\u662fKafka\u7684\u4e00\u4e2a\u91cd\u8981\u7279\u6027\uff0c\u5b83\u786e\u4fdd\u4e86\u6d88\u8d39\u8005\u80fd\u591f\u5728Broker\u6545\u969c\u6216\u65b0\u589eBroker\u65f6\uff0c\u4ecd\u7136\u80fd\u591f\u5747\u5300\u5730\u5206\u914d\u8d1f\u8f7d\u5e76\u7ee7\u7eed\u6d88\u8d39\u3002<\/p>\n
\u6545\u969c\u89e3\u51b3\u65b9\u6848\uff1a<\/h1>\n
Broker\u6545\u969c\uff1a\u5982\u679c\u4e00\u4e2aBroker\u53d1\u751f\u6545\u969c\uff0cKafka\u96c6\u7fa4\u4e2d\u7684\u5176\u4ed6Broker\u4f1a\u63a5\u7ba1\u5176\u5206\u533a\uff0c\u4ece\u800c\u4fdd\u8bc1\u6d88\u606f\u7684\u53ef\u7528\u6027\u3002\u5e94\u914d\u7f6e\u591a\u4e2aBroker\u4ee5\u5b9e\u73b0\u9ad8\u53ef\u7528\u6027\uff0c\u5e76\u4f7f\u7528\u526f\u672c\u673a\u5236\u4fdd\u969c\u6570\u636e\u4e0d\u4e22\u5931\u3002<\/p>\n
\u6d88\u8d39\u8005\u6545\u969c\uff1a\u5f53\u6d88\u8d39\u8005\u5931\u8d25\u6216\u8005\u4e3b\u52a8\u5173\u95ed\u65f6\uff0cKafka\u4f1a\u5728\u4e00\u6bb5\u65f6\u95f4\u5185\u7b49\u5f85\u5176\u6062\u590d\u3002\u5982\u679c\u6d88\u8d39\u8005\u957f\u65f6\u95f4\u4e0d\u6d3b\u52a8\uff0cKafka\u5c06\u5047\u8bbe\u5176\u5df2\u7ecf\u5931\u6548\uff0c\u5e76\u91cd\u65b0\u5206\u914d\u5206\u533a\u7ed9\u5176\u4ed6\u6d3b\u8dc3\u7684\u6d88\u8d39\u8005\u3002<\/p>\n
\u5206\u533a\u8d1f\u8f7d\u4e0d\u5747\u8861\uff1aKafka\u4f1a\u81ea\u52a8\u76d1\u6d4b\u6d88\u8d39\u8005\u7684\u72b6\u6001\uff0c\u5982\u679c\u67d0\u4e2a\u6d88\u8d39\u8005\u5904\u7406\u901f\u5ea6\u8f83\u6162\uff0c\u4f1a\u5c06\u5176\u5206\u914d\u5230\u66f4\u5c11\u7684\u5206\u533a\u3002\u800c\u5feb\u901f\u5904\u7406\u7684\u6d88\u8d39\u8005\u4f1a\u83b7\u5f97\u66f4\u591a\u7684\u5206\u533a\u3002\u8fd9\u79cd\u673a\u5236\u786e\u4fdd\u4e86\u5206\u533a\u8d1f\u8f7d\u5747\u8861\u3002<\/p>\n
\u504f\u79fb\u91cf\u63d0\u4ea4\u5931\u8d25\uff1a\u5982\u679c\u6d88\u8d39\u8005\u5728\u5904\u7406\u6d88\u606f\u540e\u63d0\u4ea4\u504f\u79fb\u91cf\u65f6\u5931\u8d25\uff0c\u5e94\u4f7f\u7528\u5408\u9002\u7684\u91cd\u8bd5\u673a\u5236\u786e\u4fdd\u504f\u79fb\u91cf\u6700\u7ec8\u80fd\u591f\u63d0\u4ea4\u6210\u529f\u3002<\/p>\n
\u6d88\u606f\u91cd\u590d\u6216\u4e22\u5931\uff1a\u7531\u4e8e\u4e0d\u540c\u6d88\u8d39\u8005\u53ef\u80fd\u5904\u7406\u76f8\u540c\u6d88\u606f\uff0c\u51fa\u73b0\u6d88\u606f\u91cd\u590d\u7684\u60c5\u51b5\u3002\u800c\u5728\u6d88\u8d39\u8005\u5904\u7406\u6d88\u606f\u4f46\u672a\u63d0\u4ea4\u504f\u79fb\u91cf\u65f6\uff0c\u6d88\u8d39\u8005\u6545\u969c\u53ef\u80fd\u5bfc\u81f4\u6d88\u606f\u4e22\u5931\u3002\u4e3a\u907f\u514d\u8fd9\u4e9b\u60c5\u51b5\uff0c\u5e94\u6b63\u786e\u7ba1\u7406\u504f\u79fb\u91cf\u3001\u4f7f\u7528\u5e42\u7b49\u751f\u4ea7\u8005\u548c\u5904\u7406\u6d88\u606f\u65f6\u4fdd\u8bc1\u6570\u636e\u4e00\u81f4\u6027\u3002<\/p>\n
    \n
  1. \u504f\u79fb\u91cf\u63d0\u4ea4\u5931\u8d25\u7684\u62a5\u9519\u4fe1\u606f\uff1a
    \n\u62a5\u9519\u4fe1\u606f\uff1aCommitFailedException: Commit cannot be completed since the group has already rebalanced and assigned the partitions to another member.<\/li>\n<\/ol>\n
    \u89e3\u51b3\u65b9\u6848\uff1a\u8fd9\u901a\u5e38\u610f\u5473\u7740\u6d88\u8d39\u8005\u7ec4\u5df2\u7ecf\u8fdb\u884c\u4e86\u91cd\u65b0\u5e73\u8861\uff0c\u800c\u5728\u91cd\u65b0\u5e73\u8861\u671f\u95f4\u65e0\u6cd5\u63d0\u4ea4\u504f\u79fb\u91cf\u3002\u4f60\u53ef\u4ee5\u901a\u8fc7\u5728\u63d0\u4ea4\u504f\u79fb\u91cf\u4e4b\u524d\u68c0\u67e5\u662f\u5426\u6709\u6b63\u5728\u8fdb\u884c\u7684\u91cd\u65b0\u5e73\u8861\u6765\u907f\u514d\u8fd9\u4e2a\u95ee\u9898\u3002<\/p>\n
    try {\n    consumer.commitSync();\n} catch (CommitFailedException e) {\n    \/\/ Handle the exception and retry if necessary\n}<\/code><\/pre>\n
    \u6d88\u606f\u91cd\u590d\u7684\u62a5\u9519\u4fe1\u606f\uff1a
    \n\u62a5\u9519\u4fe1\u606f\uff1aProducerFencedException: Producer has been fenced due to a concurrent producer with a lower epoch.<\/p>\n
    \u89e3\u51b3\u65b9\u6848\uff1a\u8fd9\u901a\u5e38\u662f\u7531\u4e8e\u751f\u4ea7\u8005\u7684epoch\uff08\u6807\u8bc6\uff09\u4e0d\u5339\u914d\uff0c\u53ef\u80fd\u662f\u56e0\u4e3a\u4e4b\u524d\u6709\u4e00\u4e2a\u65b0\u7684\u751f\u4ea7\u8005\u52a0\u5165\u4e86\u3002\u5982\u679c\u4f60\u7684\u751f\u4ea7\u8005\u542f\u52a8\u540e\u53d1\u73b0\u81ea\u5df1\u88ab\u7981\u7528\uff0c\u53ef\u4ee5\u5c1d\u8bd5\u4f7f\u7528\u65b0\u7684\u751f\u4ea7\u8005ID\uff0c\u6216\u8005\u68c0\u67e5\u662f\u5426\u6709\u5176\u4ed6\u4e0d\u6b63\u786e\u7684\u914d\u7f6e\u3002
    \n\u6d88\u606f\u4e22\u5931\u7684\u62a5\u9519\u4fe1\u606f\uff1a
    \n\u62a5\u9519\u4fe1\u606f\uff1a\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u6d88\u606f\u4e22\u5931\u53ef\u80fd\u4e0d\u4f1a\u76f4\u63a5\u62a5\u9519\u3002\u4f60\u53ef\u80fd\u4f1a\u6ce8\u610f\u5230\u6d88\u8d39\u8005\u65e0\u6cd5\u8bfb\u53d6\u5230\u9884\u671f\u7684\u6d88\u606f\u3002<\/p>\n
    \u89e3\u51b3\u65b9\u6848\uff1a\u4e3a\u4e86\u907f\u514d\u6d88\u606f\u4e22\u5931\uff0c\u786e\u4fdd\u6d88\u8d39\u8005\u5728\u5904\u7406\u6d88\u606f\u540e\u9002\u65f6\u63d0\u4ea4\u504f\u79fb\u91cf\u3002\u540c\u65f6\uff0c\u4f7f\u7528\u5e42\u7b49\u751f\u4ea7\u8005\u786e\u4fdd\u6d88\u606f\u4e0d\u4f1a\u56e0\u4e3a\u91cd\u8bd5\u800c\u91cd\u590d\u53d1\u9001\uff0c\u8fd8\u53ef\u4ee5\u5728\u6d88\u606f\u5904\u7406\u903b\u8f91\u4e2d\u4f7f\u7528\u4e8b\u52a1\u4ee5\u4fdd\u8bc1\u6d88\u606f\u7684\u6700\u7ec8\u4e00\u81f4\u6027\u3002<\/p>\n
    \/\/ Enable idempotence for the producer\nprops.put("enable.idempotence", "true");\n\/\/ Begin a transaction\nproducer.beginTransaction();\ntry {\n    \/\/ Produce messages within the transaction\n    producer.send(record1);\n    producer.send(record2);\n\n    \/\/ Commit the transaction\n    producer.commitTransaction();\n} catch (ProducerFencedException | OutOfOrderSequenceException | AuthorizationException e) {\n    \/\/ Handle exceptions\n    producer.close();\n} catch (KafkaException e) {\n    \/\/ Abort the transaction and handle the exception\n    producer.abortTransaction();\n}<\/code><\/pre>\n
    \u5206\u533a\u8d1f\u8f7d\u4e0d\u5747\u8861\u7684\u62a5\u9519\u4fe1\u606f\uff1a
    \n\u62a5\u9519\u4fe1\u606f\uff1aConsumerRebalanceListener.onPartitionsRevoked \u548c ConsumerRebalanceListener.onPartitionsAssigned<\/p>\n
    \u89e3\u51b3\u65b9\u6848\uff1a\u4f60\u53ef\u4ee5\u5b9e\u73b0ConsumerRebalanceListener\u63a5\u53e3\uff0c\u5728\u5176\u4e2d\u5904\u7406\u5206\u533a\u91cd\u65b0\u5206\u914d\u7684\u60c5\u51b5\uff0c\u786e\u4fdd\u6d88\u8d39\u8005\u5728\u5206\u533a\u91cd\u65b0\u5206\u914d\u65f6\u53ef\u4ee5\u6b63\u786e\u5730\u5904\u7406\u504f\u79fb\u91cf\u7b49\u4fe1\u606f\u3002<\/p>\n
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