CCDAK Exam Dumps : Confluent Certified Developer for Apache Kafka Certification Examination

Kafka Streams usestransactional producersto guaranteeexactly-once semantics (EOS). This ensures that both theoutput recordsandstate store updatesare committed atomically, avoiding duplication or partial writes.

FromKafka Streams Documentation > Processing Guarantees:

“Kafka Streams leveragesKafka’s transactional APIsto commit the output records and internal state updatesas a single atomic unit, thereby providing exactly-once semantics.”

Option A is incorrect because log compaction is not disabled for EOS.

Option C incorrectly describes a checkpointing system Kafka Streams does not use.

Option D refers to deduplication, which is not how EOS is achieved in Streams.

The ConsumerRebalanceListener lets youhandle partition assignments and revocationsduring rebalances. This is critical for managingoffsets,stateful processing, orexternal transactions.

FromKafka Consumer Rebalance Docs:

“Implementing ConsumerRebalanceListener allows your application to take action before and after partitions are reassigned.”

A is true: It lets your app react when partitionsassigned to the consumer change.

B, C, and D are unrelated to consumer rebalancing directly.

Kafka Connectsource connectorsuse theoffset.storage.topicconfiguration parameter to define where to storeoffsets that track the connector's positionin the source system (e.g., database, file, etc.).

FromKafka Connect Worker Configuration:

“offset.storage.topic specifies the topic in Kafka where the connector stores offsets for each source partition.”

This allows Kafka Connect toresumefrom the correct position on restart.

The other options (B–D) are not valid Kafka configs.