title: Individual Kafka consumer group behavior when listening to multiple topic
body: <p>I have two Kafka topics(topic_1,topic_2) and both of them are configured in the same Kafka server. I have two consumer applications and <strong>they are in the same consumer group</strong>.</p>
  <p>In my POC, I first start consumer application 1 (which listens to topic_1). After some time, I start consumer application 2 (which listens to topic_2).</p>
  <p>When application 2 starts running, partitions will be revoked in application 1. I could not figure out the reason for this since they are separately listening to topics and only the common attribute among them is the consumer group id. When I use different group ids I did not observe this behaviour. Appreciate it if someone could explain the reason for this behaviour.</p>