way to get RevokedPartitions & AssignedPartitions event when consumer group rebalance

[NeoyeElf]

In my case, I have serveral workers to consume kafka message. My program will create serveral mem queues to handle the message sequentially by Message.Key, and handle the commit of offsets manually.

When consumer group reBalancing, I want to be notified to ignore the unHandled messages that don't match the new assigend partitions in the mem queue.

1. Is there any way to meet my needs?
2. If rebalance occurs, and I commit the partition offsets that don't match the new assigend partitions, what will happend? will CommitMessages returns an error?

Thanks.

[onkarbanerjee]

+1 I am also looking for a way to be notified of the RevokedPartitions & AssignedPartitions event when there is a consumer group rebalance

[louisboilard]

Any updates on this? It's such an essential feature especially considering there is no support for static membership of consumer group. Are there currently any way to make sure a consumer X gets reassigned the same partitions after a rebalance? Or at least a way to know when a rebalance is about to happen to manage things ourselves?