While I haven't reached that point because with repartitioning and aggregation and various other things happening with in the stream having additional topics a simple 5 input topics with 5 partitions can end up with hundreds of total topic partitions overall.
But I'm 99% confident that it will rebalance because part of that is understanding who is available even, who has which data, latency of work being done etc. While something might be perfectly balanced 1 second, it might not be the next in theory. But if it makes you feel better, it should only rebalance for a split second if it issue seeing a reason to shift work around. But I'm more confident that you'll not be spinning up more consumers than you have total partitions to start with cause there are a lot of partitions happening with the Kafka stores each having some as well. Sejal [Patel] | CTO se...@playerzero.ai <mailto:se...@playerzero.ai> | 470.440.1255 On Wed Jun 12, 2024, 10:25 AM GMT, Sébastien Rebecchi <mailto:srebec...@kameleoon.com> wrote: > Hello, > > If I have a consumer group with more members than the number of partition > of a topic, adding a consumer to the group will still trigger a rebalancing > of partitions to the group? > > Imagine the partitions are already perfectly balanced, ie each consumer has > 1 partition. Then reblancing won't be of any use in theory. So does Kafka > still triggers a rebalancing? > > Thanks , > > Sébastien
