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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. You need to explain the best reason to implement the consumer callback interface ConsumerRebalanceListener prior to a Consumer Group Rebalance.
Which statement is correct?

A) Offsets are compacted.
B) Partition leaders may change.
C) Previous log files are deleted.
D) Partitions assigned to a consumer may change.

2. A stream processing application is tracking user activity in online shopping carts.
You want to identify periods of user inactivity.
Which type of Kafka Streams window should you use?

A) Tumbling
B) Session
C) Sliding
D) Hopping

3. (You are writing lightweight XML messages to a Kafka topic named userinfo.
Which format should you use for the value field?)

A) XmlSerializer
B) VoidSerializer
C) StringSerializer
D) ByteSerializer

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

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

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

Solutions: