Eric Chang created KAFKA-20838:
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Summary: Reduce IQv2StoreIntegrationTest runtime by disabling
test-only Streams initial rebalance delay
Key: KAFKA-20838
URL: https://issues.apache.org/jira/browse/KAFKA-20838
Project: Kafka
Issue Type: Improvement
Components: streams
Reporter: Eric Chang
Assignee: Eric Chang
IQv2StoreIntegrationTest has 280 parameterized cases and currently takes about
918 seconds (~15m19s) in CI.
Measurements show that the 108 non-global cases using the Streams group
protocol take ~698.6s, while their matched classic-protocol cases take ~154.0s.
Logs repeatedly report:
{code}
Assignment delayed due to the configured initial rebalance delay.
{code}
Each parameterized case starts a single client with a unique application.id.
This test validates IQv2 store/query behavior; it does not test cold-start or
rebalance timing.
Proposed change:
* Configure the embedded broker for this test with
group.streams.initial.rebalance.delay.ms=0.
* Preserve the full parameter matrix.
* A/B benchmark the class and rerun the relevant integration tests to validate
behavior.
Related, non-duplicate work: KAFKA-13714, KAFKA-15569, KAFKA-19705, and PR
#22125.
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