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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions (Q64-Q69):

NEW QUESTION # 64
An application is writing AVRO messages using Schema Registry to topic t1. During this process, the Schema Registry becomes unavailable for a few seconds.
What is the expected impact to the application?

A. The application may not have any impact, unless it is writing messages with a new Schema Definition.
B. Since the broker will eventually replicate the message Schema, there will not be an error.
C. Since messages are cached by the producer, the application will only get an error if the producer is sending the batch at that time.
D. All messages within that time will receive an error.

Answer: A

NEW QUESTION # 65
A stream processing application is tracking the user activity of online shopping carts. The application tracks items added to the cart, items removed from the cart, and items ordered from the cart throughout the day for each user.
You need to capture the data to identify possible periods of user inactivity.
Which type of Kafka Streams window should you use?

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

Answer: B

NEW QUESTION # 66
Which of the following errors are retriable from a producer perspective? (select two)

A. NOT_ENOUGH_REPLICAS
B. MESSAGE_TOO_LARGE
C. NOT_LEADER_FOR_PARTITION
D. TOPIC_AUTHORIZATION_FAILED
E. INVALID_REQUIRED_ACKS

Answer: A,C

Explanation:
Both of these are retriable errors, others non-retriable errors. See the full list of errors and their "retriable" status herehttps://kafka.apache.org/protocol#protocol_error_codes

NEW QUESTION # 67
Which tool can you use to modify the replication factor of an existing topic?

A. kafka-reassign-partitions.sh
B. kafka-reassign-topics.sh
C. kafka-recreate-topic.sh
D. kafka-topics.sh

Answer: A

Explanation:
To change the replication factor of an existing topic, you must perform apartition reassignment, because the replication factor is not directly modifiable via kafka-topics.sh. Thekafka-reassign-partitions.shtool is the official command-line utility to handle partition reassignments, including changing the replication factor.
This tool allows you to generate a reassignment JSON specifying new replica assignments per partition and then apply it.
From official documentation:
"To change the replication factor, use the kafka-reassign-partitions tool to assign the partitions to more or fewer brokers." Neither kafka-topics.sh nor kafka-reassign-topics.sh exists for this purpose, and kafka-recreate-topic.sh isnot an official Kafka tool.
Reference:Apache Kafka documentation > Operations > Changing Replication Factor

NEW QUESTION # 68
What information isn't stored inside of Zookeeper? (select two)

A. ACL inforomation
B. Controller registration
C. Consumer offset
D. Broker registration info
E. Schema Registry schemas

Answer: C

Explanation:
Consumer offsets are stored in a Kafka topic __consumer_offsets, and the Schema Registry stored schemas in the _schemas topic.

NEW QUESTION # 69
......

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