Kafka中不存在初始偏移量或服务器上的当前偏移量不存在时应该如何处理配置？

在Kafka消费者配置中设置auto.offset.reset选项来定义如何处理这种情况。所支持的选项有“latest”和“earliest”。如果设置为“latest”，则消费者从最新的记录开始消费，如果设置为“earliest”，则消费者从最早的记录开始消费。

示例代码：

Properties props = new Properties(); props.put("bootstrap.servers", "localhost:9092"); props.put("group.id", "test-group"); props.put("enable.auto.commit", "true"); props.put("auto.commit.interval.ms", "1000"); props.put("auto.offset.reset", "latest"); props.put("session.timeout.ms", "30000"); 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<>(props); consumer.subscribe(Collections.singleton("test-topic"));

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()); } }