Sean Quah created KAFKA-20271:
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Summary: Initialize assignment epoch to -1 when there is no
assignment yet
Key: KAFKA-20271
URL: https://issues.apache.org/jira/browse/KAFKA-20271
Project: Kafka
Issue Type: Sub-task
Components: group-coordinator
Reporter: Sean Quah
When creating a group, the assignment epoch is initialized to 0.
When tombstoning a group, the assignment epoch is set to -1.
Look into whether we can use -1 for both.
Some tests fail when initializing the assignment epoch to -1:
* DescribeGroup tests fail because the assignment epoch is -1 instead of 0.
* ConsumerGroup state tests fail because the consumer group enters ASSIGNING
because the group epoch (0) is greater than the assignment epoch (-1).
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