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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions (Q99-Q104):
NEW QUESTION # 99
How would you describe a connector in ksqlDB?
- A. DROP CONNECTOR [IF EXISTS] connector_name;
- B. DESCRIBE CONNECTOR connector_name;
- C. DESCRIBE connector_name CONNECTOR;
- D. DESCRIBE ip_sum EXTENDED;
Answer: B
NEW QUESTION # 100
while (true) {
ConsumerRecords<String, String> records = consumer.poll(100);
try {
consumer.commitSync();
} catch (CommitFailedException e) {
log.error("commit failed", e)
}
for (ConsumerRecord<String, String> record records)
{
System.out.printf("topic = %s, partition = %s, offset =
%d, customer = %s, country = %s
",
record.topic(), record.partition(),
record.offset(), record.key(), record.value());
}
}
What kind of delivery guarantee this consumer offers?
- A. Exactly-once
- B. At-most-once
- C. At-least-once
Answer: B
Explanation:
Here offset is committed before processing the message. If consumer crashes before processing the message, message will be lost when it comes back up.
NEW QUESTION # 101
Where are the ACLs stored in a Kafka cluster by default?
- A. Inside the broker's data directory
- B. Inside the Zookeeper's data directory
- C. In Kafka topic __kafka_acls
- D. Under Zookeeper node /kafka-acl/
Answer: A
Explanation:
ACLs are stored in Zookeeper node /kafka-acls/ by default.
NEW QUESTION # 102
A consumer wants to read messages from a specific partition of a topic. How can this be achieved?
- A. Call subscribe(String topic, int partition) passing the topic and partition number as the arguments
- B. Call subscribe() passing TopicPartition as the argument
- C. Call assign() passing a Collection of TopicPartitions as the argument
Answer: C
Explanation:
assign() can be used for manual assignment of a partition to a consumer, in which case subscribe() must not be used. Assign() takes a collection of TopicPartition object as an argument https://kafka.apache.org/23/javadoc/org/apache/kafka/clients/consumer/KafkaConsumer.html#assign-java.util.Collection-
NEW QUESTION # 103
In Kafka Streams, by what value are internal topics prefixed by?
- A. group.id
- B. tasks-<number>
- C. application.id
- D. kafka-streams-
Answer: C
Explanation:
In Kafka Streams, the application.id is also the underlying group.id for your consumers, and the prefix for all internal topics (repartition and state)
NEW QUESTION # 104
......
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