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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

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

2. A consumer wants to read messages from a specific partition of a topic. How can this be achieved?

A) Call subscribe() passing TopicPartition as the argument
B) Call assign() passing a Collection of TopicPartitions as the argument
C) Call subscribe(String topic, int partition) passing the topic and partition number as the arguments

3. A stream processing application is tracking the user activity of online shopping carts. The application tracks items added to the cart, items removed from the cart, and items ordered from the cart throughout the day for each user.
You need to capture the data to identify possible periods of user inactivity.
Which type of Kafka Streams window should you use?

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

4. What is the difference between exactly once semantics (EOS) and idempotence?

A) Idempotence sends updates multiple times and stores the first value. EOS sends updates multiple times and stores the latest value.
B) Idempotence Is any function that can be executed several times without changing the final result beyond its first iteration. EOS sends an update once and only one time.
C) Idempotence sends an update multiple times and only keeps the latest update EOS requests get sent multiple times, but only the first request is accepted.
D) Idempotence sends an update once and only one item. EOS is any function that can be executed several times without changing the final result beyond its first iteration

5. The kafka-console-consumer CLI, when used with the default options

A) always uses the same group id
B) does not use a group id
C) uses a random group id

Solutions: