kafka消费者需要多少内存？

Kafka消费者的内存使用量取决于许多因素，如批处理大小、负载和消息大小等。一般来说，建议为消费者分配至少512MB的内存。

以下是Java中创建Kafka消费者时为其指定内存大小的示例代码：

Properties props = new Properties(); props.put("bootstrap.servers", "localhost:9092"); props.put("group.id", "test");

// 设置Java虚拟机内存大小为512MB props.put("max.poll.records", "100"); props.put("max.partition.fetch.bytes", "1048576"); props.put("session.timeout.ms", "30000"); props.put("request.timeout.ms", "45000"); props.put("fetch.max.bytes", "1024"); props.put("fetch.min.bytes", "1"); props.put("fetch.max.wait.ms", "3000");

// 创建消费者实例并指定内存大小 KafkaConsumer<String, String> consumer = new KafkaConsumer<>(props, new StringDeserializer(), new StringDeserializer()); consumer.subscribe(Arrays.asList("test"));

// 处理消息 while (true) { ConsumerRecords<String, String> records = consumer.poll(Duration.ofMillis(100)); for (ConsumerRecord<String, String> record : records) { System.out.printf("offset = %d, key = %s, value = %s%n", record.offset(), record.key(), record.value()); } }