java 代码统计kafka topic一段时间的数据量
时间: 2023-07-06 13:34:18 浏览: 143
您可以使用Kafka提供的Java API来实现统计某个topic在一段时间内的数据量。
以下是实现的步骤:
1. 创建KafkaConsumer对象并指定要订阅的topic。
```java
Properties props = new Properties();
props.put("bootstrap.servers", "localhost:9092");
props.put("group.id", "test-consumer-group");
props.put("enable.auto.commit", "true");
props.put("auto.commit.interval.ms", "1000");
props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
KafkaConsumer<String, String> consumer = new KafkaConsumer<String, String>(props);
consumer.subscribe(Arrays.asList("test-topic"));
```
2. 使用poll()方法从Kafka集群获取消息。
```java
ConsumerRecords<String, String> records = consumer.poll(Duration.ofSeconds(10));
```
3. 遍历获取到的消息,并统计数据量。
```java
long count = 0;
for (ConsumerRecord<String, String> record : records) {
count++;
}
System.out.println("Count: " + count);
```
4. 关闭KafkaConsumer对象。
```java
consumer.close();
```
完整的示例代码如下:
```java
import java.time.Duration;
import java.util.Arrays;
import java.util.Properties;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
public class KafkaTopicDataCount {
public static void main(String[] args) {
Properties props = new Properties();
props.put("bootstrap.servers", "localhost:9092");
props.put("group.id", "test-consumer-group");
props.put("enable.auto.commit", "true");
props.put("auto.commit.interval.ms", "1000");
props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
KafkaConsumer<String, String> consumer = new KafkaConsumer<String, String>(props);
consumer.subscribe(Arrays.asList("test-topic"));
long count = 0;
ConsumerRecords<String, String> records = consumer.poll(Duration.ofSeconds(10));
for (ConsumerRecord<String, String> record : records) {
count++;
}
System.out.println("Count: " + count);
consumer.close();
}
}
```
注意:这段代码只能统计一段时间内的数据量,如果要统计总共的数据量,需要将该代码放在一个无限循环中,并且在每一次循环中进行累加。
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