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Guozhang Wang commented on KAFKA-5586: -------------------------------------- Hi [~hachikuji], with KIP-394 and KIP-91, that Streams is also going to remove its override on `max.poll.interval.ms` to use consumer default (5min) in KIP-442, I think this would not be an issue worth resolving now. WDYT? > Handle client disconnects during JoinGroup > ------------------------------------------ > > Key: KAFKA-5586 > URL: https://issues.apache.org/jira/browse/KAFKA-5586 > Project: Kafka > Issue Type: Bug > Components: consumer > Reporter: Jason Gustafson > Priority: Major > > If a consumer disconnects with a JoinGroup in-flight, we do not remove it > from the group until after the Join phase completes. If the client > immediately re-sends the JoinGroup request and it already had a memberId, > then the callback will be replaced and there is no harm done. For the other > cases: > 1. If the client disconnected due to a failure and does not re-send the > JoinGroup, the consumer will still be included in the new group generation > after the rebalance completes, but will immediately timeout and trigger a new > rebalance. > 2. If the consumer was not a member of the group and re-sends JoinGroup, then > a new memberId will be created for that consumer and the old one will not be > removed. When the rebalance completes, the old memberId will timeout and a > rebalance will be triggered. > To address these issues, we should add some additional logic to handle client > disconnections during the join phase. For newly generated memberIds, we > should simply remove them. For existing members, we should probably leave > them in the group and reset the heartbeat expiration task. > Note that we currently have no facility to expose disconnects from the > network layer to the other layers, so we need to find a good approach for > this. -- This message was sent by Atlassian JIRA (v7.6.3#76005)