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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. Your application is consuming from a topic configured with a deserializer.
It needs to be resilient to badly formatted records ("poison pills"). You surround the poll() call with a try/catch for RecordDeserializationException.
You need to log the bad record, skip it, and continue processing.
Which action should you take in the catch block?

A) Log the bad record and seek the consumer to the offset of the next record.
B) Throw a runtime exception to trigger a restart of the application.
C) Log the bad record, no other action needed.
D) Log the bad record and call the consumer.skip() method.

2. You create a topic named loT-Data with 10 partitions and replication factor of three.
A producer sends 1 MB messages compressed with Gzip.
Which two statements are true in this scenario?
(Select two.)

A) Compression type will be stored in batch attributes.
B) By default, compression is the producer's responsibility.
C) All compressed messages will be stored in the same topic partition.
D) The message is already compressed so it will not be serialized.

3. (You are building real-time streaming applications using Kafka Streams.
Your application has a custom transformation.
You need to define custom processors in Kafka Streams.
Which tool should you use?)

A) Processor API
B) Kafka Streams Custom Transformation Language
C) Kafka Streams Domain Specific Language (DSL)
D) TopologyTestDriver

4. (You have a Kafka Connect cluster with multiple connectors deployed.
One connector is not working as expected.
You need to find logs related to that specific connector to investigate the issue.
How can you find the connector's logs?)

A) Make no change; there is no way to isolate connector logs.
B) Modify the log4j.properties file to add a dedicated log appender for the connector.
C) Change the log level to DEBUG to include connector context information.
D) Modify the log4j.properties file to enable connector context.

5. (A consumer application runs once every two weeks and reads from a Kafka topic.
The last time the application ran, the last offset processed was 217.
The application is configured with auto.offset.reset=latest.
The current offsets in the topic start at 318 and end at 588.
Which offset will the application start reading from when it starts up for its next run?)

A) 218
B) 0
C) 318
D) 589

Solutions: