- 消费者
Properties props = new Properties();
String groupId = "consumer-tutorial-group";
List<String> topics = Arrays.asList("consumer-tutorial");
props.put("bootstrap.servers", "192.168.1.75:9092");
props.put("group.id", groupId);
props.put("enable.auto.commit", "true");
props.put("key.deserializer", StringDeserializer.class.getName());
props.put("value.deserializer", StringDeserializer.class.getName());
KafkaConsumer<String, String> consumer = new KafkaConsumer<String, String>(props);
try {
consumer.subscribe(topics);
while (true) {
ConsumerRecords<String, String> records = consumer.poll(Long.MAX_VALUE);
for (ConsumerRecord<String, String> record : records)
System.out.printf("offset = %d, key = %s, value = %s", record.offset(), record.key(), record.value());
}
} catch (Exception e) {
System.out.println(e.toString());
} finally {
consumer.close();
}
}
我试图编写运行上面的代码,它是一个简单的消费者代码,试图从一个主题读取,但是我遇到了一个奇怪的异常,我无法处理它。
org.apache.kafka.common.protocol.types.SchemaException: Error reading field 'topic_metadata': Error reading array of size 1139567, only 45 bytes available
我也给你引用我的生产者代码
-制作人
Properties props = new Properties();
props.put("bootstrap.servers", "192.168.1.7:9092");
props.put("acks", "all");
props.put("retries", 0);
props.put("batch.size", 16384);
props.put("linger.ms", 1);
props.put("buffer.memory", 33554432);
props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
Producer<String, String> producer = new KafkaProducer<String, String>(props);
for(int i = 0; i < 100; i++)
producer.send(new ProducerRecord<String, String>("consumer-tutorial", Integer.toString(i), Integer.toString(i)));
producer.close();
这是kafka的配置
-启动动物园管理员
bin / zookeeper-server-start.sh config / zookeeper.properties
-启动Kafka服务器
bin / kafka-server-start.sh config / server.properties
-创建一个话题
bin / kafka-topics.sh-创建-主题消费者指南-复制因子1-分区3 --zookeeper 192.168.1.75:2181
-卡夫卡0.10.0
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-clients</artifactId>
<version>0.10.0.0</version>
</dependency>
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka_2.11</artifactId>
<version>0.10.0.0</version>
</dependency>
我通过降级到kafka 0.9.0解决了我的问题,但对我来说仍然不是有效的解决方案。如果有人知道如何在kafka 0.10.0版本中解决此问题的有效方法,请随时发布。在那之前,这是我的解决方案
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-clients</artifactId>
<version>0.9.0.0</version>
</dependency>
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka_2.11</artifactId>
<version>0.9.0.0</version>
</dependency>
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我来说两句