David Jacot created KAFKA-15763:
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Summary: Group Coordinator should not deliver new assignment
before previous one is acknowledged
Key: KAFKA-15763
URL: https://issues.apache.org/jira/browse/KAFKA-15763
Project: Kafka
Issue Type: Sub-task
Reporter: David Jacot
Assignee: David Jacot
In the initial implementation of the new consumer group protocol, the group
coordinators waits on received an acknowledgement from the consumer only when
there are partitions to be revoked. In the case of newly assigned partitions, a
new assignment can be delivered any time (e.g. in two subsequent heartbeats).
While implementing the state machine on the client side, we found out that this
caused confusion because the protocol does not treat revocation and assignment
in the same way. We also found out that changing the assignment before the
previous one is fully processed by the member makes the client side logic more
complicated than it should be because the consumer can't process any new
assignment until it has completed the previous one.
In the end, it is better to change the server side to not deliver a new
assignment before the current one is acknowledged by the consumer.
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