Hello, I couldn't find an answer in the documentation to the following. If a new machine joins a consumer group and Kafka triggers a rebalance, will it randomly reassign partitions or will it hand over partitions from existing consumers to the newly joined one? In other words, will it attempt to move as few partitions as possible between consumers?
The main implications of this is local in-memory caches and scaling up the number of machines in a consumer group, since the scaling up operation will require nuking any local caches for the partitions that were moved. This would cause a spike on any DBs that are being cached on the consumers. Best, Edvard
