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

Comprehensive and Detailed Explanation From Exact Extract:

✅ C. Consumers can consume both committed and uncommitted transactions.By default, Kafka consumers only read committed messages if they are configured with isolation.level=read_committed. However, if configured as read_uncommitted, they can also consume uncommitted (potentially aborted) transactional messages.

From Kafka Documentation:

"The isolation.level setting controls whether the consumer will read only committed messages or all messages, including uncommitted messages from ongoing or aborted transactions."

✅ D. Information about producers and their transactions is stored in the _transaction_state topic.Kafka uses an internal topic named __transaction_state to maintain metadata about producer transactions. This topic is essential for tracking the transaction lifecycle, fencing, and recovery.

From Kafka Internals:

“Kafka stores the state of active and completed transactions in an internal topic called __transaction_state.”

The offset in the RecordMetadata object returned by the producer represents the position of the record in the partition — i.e., the sequential ID assigned by Kafka once the message is committed.

From Kafka Producer API Documentation:

“The offset is the position of the record in the partition. This is a unique, sequential number assigned by the broker.”

D refers to metadata.partition(), not offset().

B and C are unrelated to how Kafka handles committed offsets.

The default maximum message size that a Kafka broker accepts is 1MB (1,048,576 bytes), controlled by the config property message.max.bytes.

From Kafka Broker Configuration Docs:

“The default maximum message size is 1MB. To accept larger messages, configure message.max.bytes and the producer’s max.request.size.”

Producers also have a matching limit via max.request.size, and consumers via fetch.message.max.bytes.