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From "Jason Gustafson (JIRA)" <j...@apache.org>
Subject [jira] [Created] (KAFKA-5580) Group rebalance delay only used with generation 0
Date Mon, 10 Jul 2017 22:44:00 GMT
Jason Gustafson created KAFKA-5580:

             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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