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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