Jason Gustafson created KAFKA-2596:
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Summary: Coordinator should return illegal generation for commits
from unknown groups with non-negative generation
Key: KAFKA-2596
URL: https://issues.apache.org/jira/browse/KAFKA-2596
Project: Kafka
Issue Type: Bug
Affects Versions: 0.9.0.0
Reporter: Jason Gustafson
Assignee: Jason Gustafson
Currently the consumer coordinator accepts offset commits blindly if it has no
state stored for the associated groupId. This means that upon coordinator
failover, offset commits from any member of a group will be accepted, even if
that member is from an older generation. A better way of handling this case
would be to return an ILLEGAL_GENERATION error when the generation in the
commit request is greater than or equal to 0. Consumers that are not using
group management will always send a generation of -1, so their commits will
still be accepted as valid.
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