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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. (A consumer application needs to use an at-most-once delivery semantic.
What is the best consumer configuration and code skeleton to avoid duplicate messages being read?)

A) auto.offset.reset=latest and enable.auto.commit=truewhile (true) {final var records = consumer.poll (POLL_TIMEOUT);for (var record : records) {// Any processing}consumer.commitAsync();}
B) auto.offset.reset=earliest and enable.auto.commit=falsewhile (true) {final var records = consumer.poll (POLL_TIMEOUT);for (var record : records) {// Any processing}consumer.commitAsync();}
C) auto.offset.reset=earliest and enable.auto.commit=truewhile (true) {final var records = consumer.poll (POLL_TIMEOUT);consumer.commitAsync();for (var record : records) {// Any processing}}
D) auto.offset.reset=earliest and enable.auto.commit=falsewhile (true) {final var records = consumer.poll (POLL_TIMEOUT);consumer.commitAsync();for (var record : records) {// Any processing}}

2. What is a consequence of increasing the number of partitions in an existing Kafka topic?

A) Consumers will need to process data from more partitions which will significantly increase consumer lag.
B) Records with the same key could be located in different partitions.
C) The acknowledgment process will increase latency for producers using acks=all.
D) Existing data will be redistributed across the new number of partitions temporarily increasing cluster load.

3. 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, 1 actively consuming
B) 5 created, 5 actively consuming
C) 15 created, 15 actively consuming
D) 15 created, 5 actively consuming

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

5. Which configuration allows more time for the consumer poll to process records?

A) session.timeout.ms
B) heartbeat.interval.ms
C) fetch.max.wait.ms
D) max.poll.interval.ms

Solutions: