What you are talking about is manual partition assignment, which is different than reassignment upon rebalancing.
Consumer informs group coordinator that close() is invoked and that would eventually cause rebalancing. I believe what you are talking about is the rebalance listener. On 1 Jun 2018 05:41, "Shantanu Deshmukh" <shantanu...@gmail.com> wrote: Do you want to avoid rebalancing in such way that if a consumer exits then its previously owned partition should be left disowned? But then who will consume from partition that was deserted by a exiting consumer? In such case you can go for manual partition assignment. Then there is no question of consumer-group management and subsequently rebalancing. On Thu, May 31, 2018 at 6:00 PM M. Manna <manme...@gmail.com> wrote: > Hello, > > We are trying to move from single partition to multi-partition approach for > our topics. The purpose is: > > 1) Each production/testbed server will have a non-Daemon thread (consumer) > running. > 2) It will consume messages, commit offset (manual), and determine next > steps if commit fails, app fails etc. > 3) Ideally, 1 partition per server (consumer). If rebalance occurs, first > (lexi ordered) server will end up having additional partition(s). > > As I previously understood, and also read Consumer article by Jason > Gustafson > < > https://www.confluent.io/blog/tutorial-getting-started-with-the-new-apache-kafka-0-9-consumer-client/ > >, > we should always close consumers for resource optimisation. But departing > from a consumer group means that a rebalance will occur. In our case, we > would like every consumer to be alive (and sleep for a while) but still > send heartbeat so that rebalancing effort is saved. But we re worried > whether this might cause memory leak in our application. > > In other words, if we don't restart the servers (shutdown hook), we would > like to avoid invoking KafkaConsumer#close(). > > Has anyone got similar use case that they can share with us? We are simply > interested to know whether this is a "use-case" scenario or not a good > practice to keep consumers alive. > > Any suggestion/help is appreciated. > > Regards, >
