Hello, I have recently had some message loss for a consumer group under kafka 2.3.0.
The client I am using is still in 2.2.0. Here is how the problem can be reproduced, 1) The messages were sent to 4 consumer groups, 3 of them were live and 1 was down 2) When the consumer group came back online, the messages were not received. I am using manual offset commit (in a typical while loop-based consumer thread - same as Kafka Officail Docs), and I only commit offset when I have fully processed the messages. My Poll time is *4*s. My affected topic has 6 partitions and 3 replicas. The timeout and connection duration are all sufficiently set. The issue is only when when the consumer group (all consumers) go offline for a while (e.g. server down) and comes back online. Could someone please help me understanding the issue? Regards,
