CCDAK Confluent Exam Questions and Free Practice Test

Question 7

Select all that applies (select THREE)

A. min.insync.replicas is a producer setting

B. acks is a topic setting

C. acks is a producer setting

D. min.insync.replicas is a topic setting

E. min.insync.replicas matters regardless of the values of acks

F. min.insync.replicas only matters if acks=all

Correct Answer:CDF
acks is a producer setting min.insync.replicas is a topic or broker setting and is only effective when acks=all

Question 8

You are receiving orders from different customer in an "orders" topic with multiple partitions. Each message has the customer name as the key. There is a special customer named ABC that generates a lot of orders and you would like to reserve a partition exclusively for ABC. The rest of the message should be distributed among other partitions. How can this be achieved?

A. Add metadata to the producer record

B. Create a custom partitioner

C. All messages with the same key will go the same partition, but the same partition may have messages with different key

D. It is not possible to reserve

E. Define a Kafka Broker routing rule

Correct Answer:B
A Custom Partitioner allows you to easily customise how the partition number gets computed from a source message.

Question 9

If I produce to a topic that does not exist, and the broker setting auto.create.topic.enable=true, what will happen?

A. Kafka will automatically create the topic with 1 partition and 1 replication factor

B. Kafka will automatically create the topic with the indicated producer settings num.partitions and default.replication.factor

C. Kafka will automatically create the topic with the broker settings num.partitions and default.replication.factor

D. Kafka will automatically create the topic with num.partitions=#of brokers and replication.factor=3

Correct Answer:C
The broker settings comes into play when a topic is auto created

Question 10

Once sent to a topic, a message can be modified

A. No

B. Yes

Correct Answer:A
Kafka logs are append-only and the data is immutable

Question 11

How will you read all the messages from a topic in your KSQL query?

A. KSQL reads from the beginning of a topic, by default.

B. KSQL reads from the end of a topi

C. This cannot be changed.

D. Use KSQL CLI to set auto.offset.reset property to earliest

Correct Answer:C
Consumers can set auto.offset.reset property to earliest to start consuming from beginning. For KSQL, SET 'auto.offset.reset'='earliest';

Question 12

How can you gracefully make a Kafka consumer to stop immediately polling data from Kafka and gracefully shut down a consumer application?

A. Call consumer.wakeUp() and catch a WakeUpException

B. Call consumer.poll() in another thread

C. Kill the consumer thread

Correct Answer:A
See https://stackoverflow.com/a/37748336/3019499

START CCDAK EXAM