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Confluent CCDAK Exam Syllabus Topics:

Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

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

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

2. 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) 3
C) 2
D) 4

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

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

5. (You are experiencing low throughput from a Java producer.
Kafka producer metrics show a low I/O thread ratio and low I/O thread wait ratio.
What is the most likely cause of the slow producer performance?)

A) The producer code has an expensive callback function.
B) There is a bad data link layer (Layer 2) connection from the producer to the cluster.
C) Compression is enabled.
D) The producer is sending large batches of messages.

Solutions: