Jason Gustafson created KAFKA-4704:
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Summary: Group coordinator cache loading fails if groupId is used
first for consumer groups and then for simple consumer
Key: KAFKA-4704
URL: https://issues.apache.org/jira/browse/KAFKA-4704
Project: Kafka
Issue Type: Bug
Affects Versions: 0.10.1.1, 0.10.1.0, 0.10.0.1, 0.10.0.0
Reporter: Jason Gustafson
Assignee: Jason Gustafson
Fix For: 0.10.2.0
When all the members in a consumer group have died and all of its offsets have
expired, we write a tombstone to __consumer_offsets so that its group metadata
is cleaned up. It is possible that after this happens, the same groupId is then
used only for offset storage (i.e. by "simple" consumers). Our current cache
loading logic, which is triggered when a coordinator first takes over control
of a partition, does not account for this scenario and would currently fail.
This is probably an unlikely scenario to hit in practice, but it reveals the
lack of test coverage around the cache loading logic. We should improve this.
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