Confluent Certified Developer for Apache Kafka Certification Examination CCDAK Exam Questions with Experts Answers Updated Recently

Unit Testing→ MockProducer

Integration Testing→ Testcontainers

Performance Testing→ Trogdor

Mock Data Generation→ Connect Datagen

MockProducer: Simulates a Kafka producer in unit tests (no real broker interaction).

Testcontainers: Spawns Kafka in Docker forreal environment testing.

Trogdor: Kafka’s built-inperformance load testingframework.

Connect Datagen: Createssample source recordsfor test and demo purposes.

FromKafka Developer Tools Guide:

“Kafka developers commonly use MockProducer for unit tests, Testcontainers for integration, and Trogdor for performance tests.”

Each of these settings plays a key role inKafka Connect offset management:

offset.flush.interval.ms=60000 → Offset commits happen every 60 seconds.

offset.flush.timeout.ms=500 → The flush operation times out if it takes more than 500 ms.

offset.storage.topic=connect-offsets → This is the internal topic for storing source offsets.

offset.storage.replication.factor=-1 → This uses thebroker's default replication factor(commonly set via default.replication.factor).

FromKafka Connect Docs:

“If offset.storage.replication.factor=-1, the value will be determined by the broker's default replication factor.”

A:Kafka batches storecompression metadata in their headers, indicating how the batch was compressed.

B:Compression is controlled via theproducer config compression.type, which defaults to none. Producers explicitly set Gzip or other formats.

FromKafka Producer Docs:

“Compression is done by the producer, and the type is stored in the message batch metadata. The broker does not recompress.”

C is false: messages are serializedbeforecompression.

D is false: messages without keys are distributed acrossmultiple partitions.