转载自 springboot手动提交kafka offset

enable.auto.commit参数设置成了false

但是测试发现enable.auto.commit参数设置成了false，kafka的offset依然提交了（也没有进行人工提交offset）。

查看源码

如果我们enable.auto.commit设置为false，那么就会走标红的if语句。而且下面有个stopInvokerAndCommitManualAcks()方法，看名字就知道是人工提交的意思。那么我们进去stopInvokerAndCommitManualAcks()方法瞅瞅。 

如上图所示有个processCommits()方法，那么继续追进去： 

单单看标红的方法是不是就知道这方法里面是更新offset和提交offset的方法。那么我们继续追进去：

结论：如果我们把enable.auto.commit参数设置成true。那么offset交给kafka来管理，offset进行默认的提交模式。 
enable.auto.commit参数设置成false。那么就是Spring来替为我们做人工提交，从而简化了人工提交的方式。 
所以kafka和springboot结合中的enable.auto.commit为false为spring的人工提交模式。enable.auto.commit为true是采用kafka的默认提交模式。 

手动提交

spring.kafka.consumer.enable-auto-commit设置为false，设置AckMode的值

 /*** The offset commit behavior enumeration.*/public enum AckMode {/*** Commit after each record is processed by the listener.*/RECORD,/*** Commit whatever has already been processed before the next poll.*/BATCH,/*** Commit pending updates after* {@link ContainerProperties#setAckTime(long) ackTime} has elapsed.*/TIME,/*** Commit pending updates after* {@link ContainerProperties#setAckCount(int) ackCount} has been* exceeded.*/COUNT,/*** Commit pending updates after* {@link ContainerProperties#setAckCount(int) ackCount} has been* exceeded or after {@link ContainerProperties#setAckTime(long)* ackTime} has elapsed.*/COUNT_TIME,/*** User takes responsibility for acks using an* {@link AcknowledgingMessageListener}.*/MANUAL,/*** User takes responsibility for acks using an* {@link AcknowledgingMessageListener}. The consumer is woken to

• RECORD
  每处理一条commit一次
• BATCH(默认)
  每次poll的时候批量提交一次，频率取决于每次poll的调用频率
• TIME 
  每次间隔ackTime的时间去commit
• COUNT 
  累积达到ackCount次的ack去commit
• COUNT_TIME
  ackTime或ackCount哪个条件先满足，就commit
• MANUAL
  listener负责ack，但是背后也是批量上去
• MANUAL_IMMEDIATE
  listner负责ack，每调用一次，就立即commit

manual commit

@KafkaListener(topics = "k010")public void listen(ConsumerRecord<?, ?> cr,Acknowledgment ack) throws Exception {LOGGER.info(cr.toString());ack.acknowledge();}

方法参数里头传递Acknowledgment，然后手工ack

如果只添加上面语句会报错：

the listener container must have a MANUAL Ackmode to populate the Acknowledgment

我们要配置AckMode为MANUAL Ackmode

factory.getContainerProperties().setAckMode(AbstractMessageListenerContainer.AckMode.MANUAL);