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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. Which two producer exceptions are examples of the class RetriableException? (Select two.)

A) AuthorizationException
B) RecordTooLargeException
C) NotEnoughReplicasException
D) LeaderNotAvailableException

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) Sliding
B) Session
C) Tumbling
D) Hopping

3. (What are two stateless operations in the Kafka Streams API?
Select two.)

A) Join
B) GroupBy
C) Reduce
D) Filter

4. (Which configuration determines the maximum number of records a consumer can poll in a single call to poll()?)

A) fetch.max.records
B) max.records.consumer
C) max.poll.records.interval
D) max.poll.records

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

Solutions: