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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. (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) Sliding
B) Hopping
C) Session
D) Tumbling

2. Which tool can you use to modify the replication factor of an existing topic?

A) kafka-topics.sh
B) kafka-reassign-partitions.sh
C) kafka-reassign-topics.sh
D) kafka-recreate-topic.sh

3. (You are implementing a Kafka Streams application to process financial transactions.
Each transaction must be processed exactly once to ensure accuracy.
The application reads from an input topic, performs computations, and writes results to an output topic.
During testing, you notice duplicate entries in the output topic, which violates the exactly-once processing requirement.
You need to ensure exactly-once semantics (EOS) for this Kafka Streams application.
Which step should you take?)

A) Enable compaction on the output topic to handle duplicates.
B) Set enable.exactly_once=true in the Kafka Streams configuration.
C) Set enable.idempotence=true in the internal producer configuration of the Kafka Streams application.
D) Set processing.guarantee=exactly_once_v2 in the Kafka Streams configuration.

4. The producer code below features a Callback class with a method called onCompletion().
When will the onCompletion() method be invoked?

A) When the producer puts the message into its socket buffer
B) When the producer receives the acknowledgment from the broker
C) When a consumer sends an acknowledgement to the producer
D) When the producer batches the message

5. You are building a system for a retail store selling products to customers.
Which three datasets should you model as a GlobalKTable?
(Select three.)

A) Customer profile information
B) Inventory of products at a warehouse
C) All purchases at a retail store occurring in real time
D) Log of payment transactions
E) Catalog of products

Solutions: