perf(test): cut high-cost CI test latency while preserving coverage

[FrankChen021]

Summary

Reduce avoidable latency in high-cost test fixtures and setup paths while preserving test payloads, ordering, partitioning, transaction boundaries, retry/failure injection, and assertions.

The optimized values are averages of passing local Surefire runs. Interrupted or resource-limited runs are excluded.

Surefire duration comparison

Test	Original Surefire	Optimized average Surefire	Improvement
AutoCompactionTest filtered supervisor tests	245.171s	13.863s	231.308s / 94.34%
MSQWorkerFaultToleranceTest#test_cancelledWorker_isRetried_ifFaultToleranceIsEnabled	312.000s	12.845s	299.155s / 95.88%
CostBasedAutoScalerIntegrationTest#test_autoScaler_scalesUpAndDown_withSlowPublish	176.500s	75.220s	101.280s / 57.4%
FrameWriterTest#test_insufficientWriteCapacity (3 applicable parameter sets)	70.950s	10.525s	60.425s / 85.2%
RangePartitionMultiPhaseParallelIndexingTest[4]#createsCorrectRangePartitions	56.770s	12.185s	44.585s / 78.5%
KafkaRecordSupplierTest#testSeekUnassigned	125.3s	5.7s	119.6s / 95.5%
KinesisFaultToleranceTest#test_supervisorRecovers_afterCoordinatorRestart	97.6s	43.0s	54.7s / 56.0%
KinesisFaultToleranceTest#test_supervisorRecovers_afterHistoricalRestart	79.0s	33.7s	45.2s / 57.2%
KinesisFaultToleranceTest#test_supervisorRecovers_afterOverlordRestart	94.2s	39.5s	54.7s / 58.1%
KinesisFaultToleranceTest#test_supervisorRecovers_afterSuspendResume	76.4s	35.3s	41.1s / 53.8%
MergingRowIteratorTest#testAllPossible5ElementSequences	53.845s	35.635s	18.210s / 33.8%

Validation

• Rebased onto the latest apache/druid/master.
• mvn -ntp test-compile -pl embedded-tests,processing,indexing-service -am -Pskip-static-checks -Dweb.console.skip=true -T1C — passed.
• The complete affected test classes and focused tests passed with no migration-related failures.
• Checkstyle, SpotBugs, and git diff --check passed before publication.

[Copilot]

Copilot was unable to review this pull request because the user who requested the review has reached their quota limit.

[FrankChen021]

Severity	Findings
P0	0
P1	0
P2	2
P3	0
Total	2

The review found two P2 test and integration risks affecting fault-tolerance timing and Kinesis request batching.

Reviewed 9 of 9 changed files.

---

This is an automated review by Codex GPT-5.6-Luna(max)

[FrankChen021]

Severity	Findings
P0	0
P1	0
P2	1
P3	0
Total	1

The current incremental review did not introduce a new issue, but the earlier finding below remains applicable after the latest update.

Reviewed 10 of 10 changed files.

Validation: focused git diff --no-ext-diff --check from the previous reviewed commit to current HEAD passed. Builds and tests were not run.

---

This is an automated review by Codex GPT-5.6-Luna(max)