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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. An application is consuming messages from Kafka.
The application logs show that partitions are frequently being reassigned within the consumer group.
Which two factors may be contributing to this?
(Select two.)

A) There is a slow consumer processing application.
B) An instance of the application is crashing and being restarted.
C) The number of partitions does not match the number of application instances.
D) There is a storage issue on the broker.

2. (A consumer application needs to use an at-most-once delivery semantic.
What is the best consumer configuration and code skeleton to avoid duplicate messages being read?)

A) auto.offset.reset=earliest and enable.auto.commit=falsewhile (true) {final var records = consumer.poll (POLL_TIMEOUT);consumer.commitAsync();for (var record : records) {// Any processing}}
B) auto.offset.reset=latest and enable.auto.commit=truewhile (true) {final var records = consumer.poll (POLL_TIMEOUT);for (var record : records) {// Any processing}consumer.commitAsync();}
C) auto.offset.reset=earliest and enable.auto.commit=truewhile (true) {final var records = consumer.poll (POLL_TIMEOUT);consumer.commitAsync();for (var record : records) {// Any processing}}
D) auto.offset.reset=earliest and enable.auto.commit=falsewhile (true) {final var records = consumer.poll (POLL_TIMEOUT);for (var record : records) {// Any processing}consumer.commitAsync();}

3. Which configuration allows more time for the consumer poll to process records?

A) fetch.max.wait.ms
B) session.timeout.ms
C) heartbeat.interval.ms
D) max.poll.interval.ms

4. The producer code below features a Callback class with a method called onCompletion().
When will the onCompletion() method be invoked?

A) When the producer batches the message
B) When a consumer sends an acknowledgement to the producer
C) When the producer puts the message into its socket buffer
D) When the producer receives the acknowledgment from the broker

5. Which configuration determines how many bytes of data are collected before sending messages to the Kafka broker?

A) max.block.size
B) send.buffer.bytes
C) batch.size
D) buffer.memory

Solutions: