Confluent CCDAK : Confluent Certified Developer for Apache Kafka Certification Examination

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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. A stream processing application is consuming from a topic with five partitions. You run three instances of the application. Each instance has num.stream.threads=5.
You need to identify the number of stream tasks that will be created and how many will actively consume messages from the input topic.

A) 5 created, 5 actively consuming
B) 15 created, 15 actively consuming
C) 5 created, 1 actively consuming
D) 15 created, 5 actively consuming

2. Where are source connector offsets stored?

A) offset.storage.topic
B) offset, storage, partitions
C) topic.offset.config
D) storage.offset.topic

3. Your application is consuming from a topic with one consumer group.
The number of running consumers is equal to the number of partitions.
Application logs show that some consumers are leaving the consumer group during peak time, triggering a rebalance. You also notice that your application is processing many duplicates.
You need to stop consumers from leaving the consumer group.
What should you do?

A) Reduce max.poll.records property.
B) Increase session.timeout.ms property.
C) Add more consumer instances.
D) Split consumers in different consumer groups.

4. You are sending messages to a Kafka cluster in JSON format and want to add more information related to each message:
Format of the message payload
Message creation time
A globally unique identifier that allows the message to be traced through the systemWhere should this additional information be set?

A) Broker
B) Header
C) Value
D) Key

5. (You want to read messages from all partitions of a topic in every consumer instance of your application.
How do you do this?)

A) Use the subscribe() method with an empty consumer group name configuration.
B) Use the subscribe() method with a regular expression argument.
C) Use the assign() method using all topic-partitions of the topic as argument.
D) Use the assign() method with the topic name as argument.

Solutions: