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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. (You are writing a producer application and need to ensure proper delivery.
You configure the producer with acks=all.
Which two actions should you take to ensure proper error handling?
Select two.)

A) Surround the call to producer.send() with a try/catch block to catch KafkaException.
B) Use a callback argument in producer.send() where you check delivery status.
C) Check that producer.send() returned a RecordMetadata object and is not null.
D) Check the value of ProducerRecord.status().

2. (A stream processing application tracks user activity in online shopping carts, including items added, removed, and ordered throughout the day for each user.
You need to capture data to identify possible periods of user inactivity.
Which type of Kafka Streams window should you use?)

A) Hopping
B) Sliding
C) Tumbling
D) Session

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=latest and enable.auto.commit=truewhile (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=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}}

4. You need to set alerts on key broker metrics to trigger notifications when the cluster is unhealthy.
Which are three minimum broker metrics to monitor?
(Select three.)

A) kafka.controller:type=KafkaController,name=TopicsToDeleteCount
B) kafka.controller:type=ControllerStats,name=UncleanLeaderElectionsPerSec
C) kafka.controller:type=KafkaController,name=ActiveControllerCount
D) kafka.controller:type=KafkaController,name=OfflinePartitionsCount
E) kafka.controller:type=KafkaController,name=LastCommittedRecordOffset

5. Which two statements are correct when assigning partitions to the consumers in a consumer group using the assign() API?
(Select two.)

A) It is mandatory to subscribe to a topic before calling assign() to assign partitions.
B) The consumer chooses which partition to read without any assignment from brokers.
C) All topics must have the same number of partitions to use assign() API.
D) The consumer group will not be rebalanced if a consumer leaves the group.

Solutions: