Boyang Chen created KAFKA-7824:
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Summary: Require member.id for initial join group request
Key: KAFKA-7824
URL: https://issues.apache.org/jira/browse/KAFKA-7824
Project: Kafka
Issue Type: Improvement
Components: consumer
Reporter: Boyang Chen
Assignee: Boyang Chen
For request with unknown member id, broker will blindly accept the new join
group request, store the member metadata and return a UUID to consumer. The
edge case is that if initial join group request keeps failing due to connection
timeout, or the consumer keeps restarting, or the max.poll.interval.ms
configured on client is set to infinite (no rebalance timeout kicking in to
clean up the member metadata map), there will be accumulated MemberMetadata
info within group metadata cache which will eventually burst broker memory. The
detection and fencing of invalid join group request is crucial for broker
stability.
The proposed solution is to require one more bounce for the consumer to use a
valid member.id to join the group. Details in this
[KIP|https://cwiki.apache.org/confluence/display/KAFKA/KIP-394%3A+Require+member.id+for+initial+join+group+request]
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