我consumer.commit()
在 auto.commit=True 模式下运行的消费者的每条消息上调用该方法。当我在本地尝试它时,它没有任何数据丢失或数据重复。
该commit()
方法可以给消费者带来什么影响?
class KafkaConsumer(object):
def __init__(self, topics: list[str], **kwargs: Any):
config = {
**kwargs,
}
self.consumer = DeserializingConsumer(config)
self.consumer.subscribe(topics=topics)
def consume(self, poll_timeout_secs: float = 1.0):
while True:
msg = self.consumer.poll(timeout=poll_timeout_secs)
if msg is None:
continue
if msg.error():
raise KafkaException(msg.error())
else:
yield msg
kafka_consumer = KafkaConsumer(topics=topics, **kwargs) # passed "enable.auto.commit":True
for message in kafka_consumer.consume():
event = message.value()
logger.info(f"message {event}")
kafka_consumer.commit() # what will be the effect of calling this?