Jason Gustafson created KAFKA-5580:
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Summary: Group rebalance delay only used with generation 0
Key: KAFKA-5580
URL: https://issues.apache.org/jira/browse/KAFKA-5580
Project: Kafka
Issue Type: Bug
Reporter: Jason Gustafson
Assignee: Damian Guy
We use {{InitialDelayedJoin}} when a group is empty for the purpose of
[KIP-134|
https://cwiki.apache.org/confluence/display/KAFKA/KIP-134%3A+Delay+initial+consumer+group+rebalance].
However, the logic only kicks in if the generation is 0, which is not
necessarily the case when the group is empty. When all members in the group
depart, we bump up the generation and write an entry to the log with the state
set to empty; we do not reset the generation to 0.
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