我需要消耗特定的偏移量到特定的结束偏移量!! Consumer.seek()从特定的偏移量读取数据,但是我需要从offset到tooffset检索数据!任何帮助将不胜感激,在此先感谢。
ConsumerRecords<String, String> records = consumer.poll(100);
if(flag) {
consumer.seek(new TopicPartition("topic-1", 0), 90);
flag = false;
}
答案 0 :(得分:4)
要从开始偏移量到结束偏移量读取消息,首先需要使用seek()
将使用者移动到所需的起始位置,然后使用poll()
直到达到所需的末端偏移量。 / p>
例如,要从偏移量100消耗到200:
String topic = "test";
TopicPartition tp = new TopicPartition(topic, 0);
try (KafkaConsumer<String, String> consumer = new KafkaConsumer<>(configs);) {
consumer.subscribe(Arrays.asList(topic), new ConsumerRebalanceListener() {
@Override
public void onPartitionsRevoked(Collection<TopicPartition> partitions) {}
@Override
public void onPartitionsAssigned(Collection<TopicPartition> partitions) {
// Move to the desired start offset
consumer.seek(tp, 100L);
}
});
boolean run = true;
long lastOffset = 200L;
while (run) {
ConsumerRecords<String, String> crs = consumer.poll(Duration.ofMillis(100L));
for (ConsumerRecord<String, String> record : crs) {
System.out.println(record);
if (record.offset() == lastOffset) {
// Reached the end offsey, stop consuming
run = false;
break;
}
}
}
}