lucasbru commented on code in PR #20755:
URL: https://github.com/apache/kafka/pull/20755#discussion_r2460750375
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group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupMetadataManager.java:
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@@ -1985,30 +1985,54 @@ private CoordinatorResult<StreamsGroupHeartbeatResult,
CoordinatorRecord> stream
// Actually bump the group epoch
int groupEpoch = group.groupEpoch();
+ boolean isInitialRebalance = group.isEmpty();
if (bumpGroupEpoch) {
- groupEpoch += 1;
+ if (isInitialRebalance) {
+ groupEpoch = 2;
Review Comment:
If the group becomes empty at epoch 9, we are going back in time here to
epoch 2, right?
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