title: Do Kafka consumers have an open connection per partition?
body: <p>I know that each partition is allocated to one Kafka consumer (inside of a consumer-group), but one Kafka consumer can be consuming multiple partitions at the same time. If each has an open connection to the partition, then I can imagine tens of thousands of connections open per consumer. If this is true, that seems like something to watch out for when deciding on number of partitions, no?</p>