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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. (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) 0
B) 318
C) 589
D) 218

2. Which is true about topic compaction?

A) When a client produces a new event with an existing key, the old value is overwritten with the new value in the compacted log segment.
B) Topic compaction does not remove old events; instead, when clients consume events from a compacted topic, they store events in a hashmap that maintains the latest value.
C) Compaction will keep exactly one message per key after compaction of inactive log segments.
D) When a client produces a new event with an existing key, the broker immediately deletes the offset of the existing event.

3. You have a Kafka consumer in production actively reading from a critical topic.
You need to update the offset of your consumer to start reading from the beginning of the topic.
Which action should you take?

A) Start a new consumer application with the same consumer group id.
B) Update the consumer group's offset to the earliest position using the kafka-consumer-groups CLI tool.
C) Temporarily configure the topic's retention.ms parameter to 0 to empty the topic.
D) Update the consumer configuration by setting auto.offset.reset=earliest.

4. (You started a new Kafka Connect worker.
Which configuration identifies the Kafka Connect cluster that your worker will join?)

A) cluster.id
B) group.id
C) worker.id
D) connector.id

5. Which partition assignment minimizes partition movements between two assignments?

A) RoundRobinAssignor
B) PartitionAssignor
C) StickyAssignor
D) RangeAssignor

Solutions: