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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. (You have a Kafka consumer in production actively reading from a critical topic from which multiple other applications are consuming.
You have a new requirement to update the offset of your consumer to start reading from the beginning of the topic.
Which action would you take?)

A) Temporarily configure the topic's retention.ms parameter to 0 to empty the topic.
B) Update the consumer configuration by setting the auto.offset.reset property to earliest.
C) Update the consumer group's offset to the earliest position using the kafka-consumer-groups CLI tool.
D) Start a new consumer application with the same consumer group id.

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

3. You create a topic named loT-Data with 10 partitions and replication factor of three.
A producer sends 1 MB messages compressed with Gzip.
Which two statements are true in this scenario?
(Select two.)

A) The message is already compressed so it will not be serialized.
B) Compression type will be stored in batch attributes.
C) By default, compression is the producer's responsibility.
D) All compressed messages will be stored in the same topic partition.

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

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

5. (You are designing a stream pipeline to monitor the real-time location of GPS trackers, where historical location data is not required.
Each event has:
* Key: trackerId
* Value: latitude, longitude
You need to ensure that the latest location for each tracker is always retained in the Kafka topic.
Which topic configuration parameter should you set?)

A) retention.ms=infinite
B) min.cleanable.dirty.ratio=-1
C) cleanup.policy=compact
D) retention.ms=0

Solutions: