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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. (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=truewhile (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=falsewhile (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}}

2. You have a topic with four partitions. The application reads from it using two consumers in a single consumer group.
Processing is CPU-bound, and lag is increasing.
What should you do?

A) Decrease the max.poll.records property of consumers.
B) Increase the max.poll.records property of consumers.
C) Add more partitions to the topic to increase the level of parallelism of the processing.
D) Add more consumers to increase the level of parallelism of the processing.

3. Which statement describes the storage location for a sink connector's offsets?

A) The topic specified in the offsets.storage.topic configuration parameter
B) In a file specified by the offset.storage.file.filename configuration parameter
C) In memory which is then periodically flushed to a RocksDB instance
D) The __consumer_offsets topic, like any other consumer

4. You have a Kafka client application that has real-time processing requirements.
Which Kafka metric should you monitor?

A) Aggregate incoming byte rate
B) Total time to serve requests to replica followers
C) Consumer lag between brokers and consumers
D) Consumer heartbeat rate to group coordinator

5. Your Kafka cluster has five brokers. The topic t1 on the cluster has:
Two partitions
Replication factor = 4
min.insync.replicas = 3You need strong durability guarantees for messages written to topic t1.You configure a producer acks=all and all the replicas for t1 are in-sync.How many brokers need to acknowledge a message before it is considered committed?

A) 5
B) 2
C) 4
D) 3

Solutions: