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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. A producer is configured with the default partitioner. It is sending records to a topic that is configured with five partitions. The record does not contain any key.
What is the result of this?

A) Records will be sent to partition 0.
B) Records will be dispatched among the available partitions.
C) An error will be raised and no record will be sent.
D) Records will be sent to the least used partition.

2. (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) Compression is enabled.
C) The producer is sending large batches of messages.
D) There is a bad data link layer (Layer 2) connection from the producer to the cluster.

3. Clients that connect to a Kafka cluster are required to specify one or more brokers in the bootstrap.servers parameter.
What is the primary advantage of specifying more than one broker?

A) It provides the ability to wake up dormant brokers.
B) It is the mechanism to distribute a topic's partitions across multiple brokers.
C) It provides redundancy in making the initial connection to the Kafka cluster.
D) It forces clients to enumerate every single broker in the cluster.

4. You are creating a Kafka Streams application to process retail data.
Match the input data streams with the appropriate Kafka Streams object.

5. (You are developing a Kafka Streams application with a complex topology that has multiple sources, processors, sinks, and sub-topologies.
You are working in a development environment and do not have access to a real Kafka cluster or topics.
You need to perform unit testing on your Kafka Streams application.
Which should you use?)

A) TestProducer, TestConsumer
B) KafkaUnitTestDriver
C) MockProducer, MockConsumer
D) TopologyTestDriver

Solutions: