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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. (Which configuration determines the maximum number of records a consumer can poll in a single call to poll()?)

A) max.poll.records
B) max.poll.records.interval
C) fetch.max.records
D) max.records.consumer

2. Your Kafka cluster has five brokers. The topic t1 on the cluster has:
Two partitions
Replication factor = 4
min.insync.replicas = 3You need strong durability guarantees for messages written to topic t1.You configure a producer acks=all and all the replicas for t1 are in-sync.How many brokers need to acknowledge a message before it is considered committed?

A) 2
B) 5
C) 3
D) 4

3. (You have a Kafka consumer in production actively reading from a critical topic from which multiple other applications are consuming.
You have a new requirement to update the offset of your consumer to start reading from the beginning of the topic.
Which action would you take?)

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

4. Which statement describes the storage location for a sink connector's offsets?

A) In a file specified by the offset.storage.file.filename configuration parameter
B) The topic specified in the offsets.storage.topic configuration parameter
C) The __consumer_offsets topic, like any other consumer
D) In memory which is then periodically flushed to a RocksDB instance

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

Solutions: