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Posted to jira@kafka.apache.org by "Jason Gustafson (JIRA)" <ji...@apache.org> on 2017/07/10 22:44:00 UTC

[jira] [Created] (KAFKA-5580) Group rebalance delay only used with generation 0

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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