liuliuOD opened a new pull request, #23533:
URL: https://github.com/apache/kafka/pull/23533
## Summary
`KTableKTableForeignKeyInnerJoinMultiIntegrationTest` reused the same
application ID across parameterized invocations. This allowed the next
invocation to reuse the previous Streams application and consumer group
identity.
## Scope
- Affected test: `KTableKTableForeignKeyInnerJoinMultiIntegrationTest`
- Affected module: `streams/integration-tests`
## Optimization
Assign a test-specific application ID and result consumer group to each
parameterized invocation.
The three Kafka Streams instances within the same invocation continue to
share the same application ID, preserving the original multi-instance test
scenario.
## Before / After
| Measurement | Before | After | Improvement |
| --- | ---: | ---: | ---: |
| `withHeaders=true` | 47.473s | 5.870s | 41.603s faster |
| Both parameterized cases | 56.589s | 15.100s | 41.489s faster |
Measurements use the same test filter and compare JUnit XML execution time,
excluding Gradle build and compilation.
## Test Semantics Preserved
- Both parameterized cases remain unchanged.
- The three Streams instances continue to share one application ID per
invocation.
- The topology, input data, materialized stores, and assertions remain
unchanged.
- Multi-partition and foreign-key join behavior are still covered.
## Validation
```text
./gradlew :streams:integration-tests:test \
--tests
org.apache.kafka.streams.integration.KTableKTableForeignKeyInnerJoinMultiIntegrationTest
\
--no-daemon
```
Both parameterized cases passed:
- `withHeaders=false`
- `withHeaders=true`
## Risk and Compatibility
This is a test-only change. It does not modify production code, public APIs,
protocols, configuration, topology, or assertions.
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