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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. You need to correctly join data from two Kafka topics.
Which two scenarios will allow for co-partitioning?
(Select two.)

A) Both topics have the same key and partitioning strategy.
B) Both topics have the same value schema.
C) Both topics have the same retention time.
D) Both topics have the same number of partitions.

2. What is a consequence of increasing the number of partitions in an existing Kafka topic?

A) Records with the same key could be located in different partitions.
B) The acknowledgment process will increase latency for producers using acks=all.
C) Consumers will need to process data from more partitions which will significantly increase consumer lag.
D) Existing data will be redistributed across the new number of partitions temporarily increasing cluster load.

3. (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);for (var record : records) {// Any processing}consumer.commitAsync();}
B) 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}}
C) 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();}
D) 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}}

4. Which partition assignment minimizes partition movements between two assignments?

A) RangeAssignor
B) StickyAssignor
C) PartitionAssignor
D) RoundRobinAssignor

5. The producer code below features a Callback class with a method called onCompletion().
In the onCompletion() method, when the request is completed successfully, what does the value metadata.
offset() represent?

A) The number of bytes that overflowed beyond a producer batch of messages
B) The ID of the partition to which the message was committed
C) The sequential ID of the message committed into a partition
D) Its position in the producer's batch of messages

Solutions: