Sean Quah created KAFKA-20268:
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Summary: Start group epochs at 2
Key: KAFKA-20268
URL: https://issues.apache.org/jira/browse/KAFKA-20268
Project: Kafka
Issue Type: Sub-task
Components: group-coordinator
Reporter: Sean Quah
Assignee: Sean Quah
Fix For: 4.3.0
Members joining a new group must be given an epoch greater than 0, since epoch
0 is reserved for new joining members. When assignment offload or initial
rebalance delays are implemented, the initial assignment for a group will not
be available immediately. Currently groups start at epoch 1, but we cannot move
members to epoch 1 when they have not been reconciled to the epoch 1 assignment
yet.
Instead, we can start group epochs at 2 and reserve epoch 1 to hold a special
empty assignment. The initial rebalance delay for streams groups already does
this.
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