Guozhang Wang created KAFKA-8511:
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Summary: Looking into the Future: Heartbeat Communicated Protocol
Key: KAFKA-8511
URL: https://issues.apache.org/jira/browse/KAFKA-8511
Project: Kafka
Issue Type: Sub-task
Reporter: Guozhang Wang
Note that KIP-429 relies on the fact that COOPERATIVE and EAGER members can
work together within the same generation as long as the leader recognize both;
this however may not be true moving forward if we add a third rebalance
protocol. One idea to resolve this in the future is that, instead of letting
the members to decide which protocol to use "locally" before sending the
join-group request, we will use Heartbeat request / response to piggy-back the
communication of the group's supported protocols and let members to rely on
that "global" information to make decisions. More specifically:
* On Heartbeat Request, we will add additional field as a list of protocols
that this member supports.
* On Heartbeat Response, we will add additional field as a single protocol
indicating which to use if the error code suggests re-joining the group.
The broker, upon receiving the heartbeat request, if the indicated supported
protocols does not contain the one it has decided to use for the up-coming
rebalance, then reply with an fatal error.
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