[jira] [Created] (KAFKA-20690) PersisterStateBatchCombinerTest silently skips 23 of 24 cases

["Shekhar Prasad Rajak (Jira)" <ji...@apache.org>]

Shekhar Prasad Rajak created KAFKA-20690:
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             Summary: PersisterStateBatchCombinerTest silently skips 23 of 24 cases
                 Key: KAFKA-20690
                 URL: https://issues.apache.org/jira/browse/KAFKA-20690
             Project: Kafka
          Issue Type: Bug
            Reporter: Shekhar Prasad Rajak


ersisterStateBatchCombinerTest wraps every @ParameterizedTest body in if (test.shouldRun) { ... }, and shouldRun defaults to false. Only 1 of 24 parameter cases asserts; the other 23 return without invoking assertEquals, CI reports them as PASSED even when the expected value is wrong.

The PersisterStateBatchCombiner hot path also makes a few avoidable allocations: a LinkedList per getMergeCandidatePair call, and compareBatchDeliveryInfo recomputed twice per merge step.

We must: 

Remove the shouldRun gate; all cases must assert.
Correct the wrong expected value uncovered by enabling the cases.
Add a stress-test class for correctness on large inputs.




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