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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions (Q116-Q121):

NEW QUESTION # 116
In Java, Avro SpecificRecords classes are

A. automatically generated from an Avro Schema + a Maven / Gradle Plugin
B. automatically generated from an Avro Schema
C. written manually by the programmer

Answer: A

Explanation:
SpecificRecord is created from generated record classes

NEW QUESTION # 117
A producer application in a developer machine was able to send messages to a Kafka topic. After copying the producer application into another developer's machine, the producer is able to connect to Kafka but unable to produce to the same Kafka topic because of an authorization issue. What is the likely issue?

A. The Kafka ACL does not allow another machine IP
B. The Kafka Broker needs to be rebooted
C. You cannot copy a producer application from one machine to another
D. Broker configuration needs to be changed to allow a different producer

Answer: A

Explanation:
ACLs take "Host" as a parameter, which represents an IP. It can be * (all IP), or a specific IP. Here, it's a specific IP as moving a producer to a different machine breaks the consumer, so the ACL needs to be updated

NEW QUESTION # 118
Which two statements are correct when assigning partitions to the consumers in a consumer group using the assign() API?
(Select two.)

A. All topics must have the same number of partitions to use assign() API.
B. The consumer chooses which partition to read without any assignment from brokers.
C. The consumer group will not be rebalanced if a consumer leaves the group.
D. It is mandatory to subscribe to a topic before calling assign() to assign partitions.

Answer: B,C

Explanation:
Using assign() givesmanual controlover partition assignment. In this mode:
* B is true: The applicationchooses partitionsdirectly without involving the group coordinator.
* C is true: Since no group coordination occurs,no rebalancinghappens if a consumer dies.
FromKafka Consumer API Docs:
"assign() manually assigns a list of partitions to this consumer. No coordination takes place and no rebalancing is triggered."
* A is false: subscribe() and assign() aremutually exclusive.
* D is incorrect: Partitions don't need to be equal across topics.
Reference:Kafka Consumer Java API > assign() and subscribe()

NEW QUESTION # 119
Your company has three Kafka clusters: Development, Testing, and Production.
The Production cluster is running out of storage, so you add a new node.
Which two statements about the new node are true?
(Select two.)

A. A newly added node will have KRaft controller role by default.
B. A new node can be added without stopping existing cluster nodes.
C. A new node will not have any partitions assigned to it unless a new topic is created or reassignment occurs.
D. A node ID will be assigned to the new node automatically.

Answer: B,C

Explanation:
* C is true: When a new broker is added,no partitions are assigned to itunless you create new topics or reassign existing onesusing kafka-reassign-partitions.sh.
* D is true: Kafka brokers arehot-pluggable; no need to stop the cluster when scaling.
FromKafka Operations Guide:
"A newly added broker won't be assigned partitions until reassignments or new topic creation."
"Kafka allows dynamic scaling by adding brokers without downtime."
* A is false: Broker IDs must bemanually setunless using dynamic broker registration in KRaft mode.
* B is false unless the cluster usesKRaft modeand the broker isspecifically assigneda controller role.
Reference:Kafka Operations > Adding Brokers

NEW QUESTION # 120
The producer code below features a Callback class with a method called onCompletion().
When will the onCompletion() method be invoked?

A. When a consumer sends an acknowledgement to the producer
B. When the producer receives the acknowledgment from the broker
C. When the producer batches the message
D. When the producer puts the message into its socket buffer

Answer: B

Explanation:
The onCompletion() method of Kafka'sCallback interfaceis executedonce the broker acknowledgesthe message. This includes success or failure, and it isinvoked asynchronouslyby the producer.
FromKafka Java Client API Documentation:
"The onCompletion method will be called when the record sent to the server has been acknowledged, or when an error occurs." This ensures thatthe record was sent and acknowledged, not just added to a batch or local buffer.
Reference:Kafka Java Client API > org.apache.kafka.clients.producer.Callback

NEW QUESTION # 121
......

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