Confluent Certified Developer for Apache Kafka Certification Examination Question and Answers

Confluent Certified Developer for Apache Kafka Certification Examination

Last Update May 18, 2024
Total Questions : 150

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Questions 1

How does a consumer commit offsets in Kafka?

Options:

It directly sends a message to the __consumer_offsets topic

It interacts with the Group Coordinator broker

It directly commits the offsets in Zookeeper

Discussion 0

Questions 2

An ecommerce wesbite sells some custom made goods. What's the natural way of modeling this data in Kafka streams?

Options:

Purchase as stream, Product as stream, Customer as stream

Purchase as stream, Product as table, Customer as table

Purchase as table, Product as table, Customer as table

Purchase as stream, Product as table, Customer as stream

Discussion 0

Questions 3

What exceptions may be caught by the following producer? (select two)

ProducerRecord record =

new ProducerRecord<>("topic1", "key1", "value1");

try {

producer.send(record);

} catch (Exception e) {

e.printStackTrace();

}

Options:

BrokerNotAvailableException

SerializationException

InvalidPartitionsException

BufferExhaustedException

Discussion 0

Questions 4

Suppose you have 6 brokers and you decide to create a topic with 10 partitions and a replication factor of 3. The brokers 0 and 1 are on rack A, the brokers 2 and 3 are on rack B, and the brokers 4 and 5 are on rack C. If the leader for partition 0 is on broker 4, and the first replica is on broker 2, which broker can host the last replica? (select two)

Options:

Discussion 0

Questions 5

Which Kafka CLI should you use to consume from a topic?

Options:

kafka-console-consumer

kafka-topics

kafka-console

kafka-consumer-groups

Discussion 0

Questions 6

What is a generic unique id that I can use for messages I receive from a consumer?

Options:

topic + partition + timestamp

topic + partition + offset

topic + timestamp

Discussion 0

Questions 7

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?

Options:

Broker configuration needs to be changed to allow a different producer

You cannot copy a producer application from one machine to another

The Kafka ACL does not allow another machine IP

The Kafka Broker needs to be rebooted

Discussion 0

Questions 8

To produce data to a topic, a producer must provide the Kafka client with...

Options:

the list of brokers that have the data, the topic name and the partitions list

any broker from the cluster and the topic name and the partitions list

all the brokers from the cluster and the topic name

any broker from the cluster and the topic name

Discussion 0

Questions 9

A consumer wants to read messages from a specific partition of a topic. How can this be achieved?

Options:

Call subscribe(String topic, int partition) passing the topic and partition number as the arguments

Call assign() passing a Collection of TopicPartitions as the argument

Call subscribe() passing TopicPartition as the argument

Discussion 0

Questions 10

Which KSQL queries write to Kafka?

Options:

COUNT and JOIN

SHOW STREAMS and EXPLAIN statements

CREATE STREAM WITH and CREATE TABLE WITH

CREATE STREAM AS SELECT and CREATE TABLE AS SELECT

Discussion 0

Questions 11

is KSQL ANSI SQL compliant?

Options:

Yes

Discussion 0

Questions 12

Using the Confluent Schema Registry, where are Avro schema stored?

Options:

In the Schema Registry embedded SQL database

In the Zookeeper node /schemas

In the message bytes themselves

In the _schemas topic

Discussion 0

Questions 13

There are 3 producers writing to a topic with 5 partitions. There are 10 consumers consuming from the topic as part of the same group. How many consumers will remain idle?

Options:

None

Discussion 0

Questions 14

How do you create a topic named test with 3 partitions and 3 replicas using the Kafka CLI?

Options:

bin/kafka-topics.sh --create --broker-list localhost:9092 --replication-factor 3 --partitions 3 --topic test

bin/kafka-topics-create.sh --zookeeper localhost:9092 --replication-factor 3 --partitions 3 --topic test

bin/kafka-topics.sh --create --bootstrap-server localhost:9092 --replication-factor 3 --partitions 3 --topic test

bin/kafka-topics.sh --create --bootstrap-server localhost:2181 --replication-factor 3 --partitions 3 --topic test

Discussion 0

Questions 15

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

Options:

MESSAGE_TOO_LARGE

INVALID_REQUIRED_ACKS

NOT_ENOUGH_REPLICAS

NOT_LEADER_FOR_PARTITION

TOPIC_AUTHORIZATION_FAILED

Discussion 0

Questions 16

How do Kafka brokers ensure great performance between the producers and consumers? (select two)

Options:

It compresses the messages as it writes to the disk

It leverages zero-copy optimisations to send data straight from the page-cache

It buffers the messages on disk, and sends messages from the disk reads

It transforms the messages into a binary format

It does not transform the messages

Discussion 0

Questions 17

A topic receives all the orders for the products that are available on a commerce site. Two applications want to process all the messages independently - order fulfilment and monitoring. The topic has 4 partitions, how would you organise the consumers for optimal performance and resource usage?

Options:

Create 8 consumers in the same group with 4 consumers for each application

Create two consumers groups for two applications with 8 consumers in each

Create two consumer groups for two applications with 4 consumers in each

Create four consumers in the same group, one for each partition - two for fulfilment and two for monitoring

Discussion 0

Questions 18

Which of the following Kafka Streams operators are stateful? (select all that apply)

Options:

flatmap

reduce

joining

count

peek

aggregate

Discussion 0

Questions 19

If I want to send binary data through the REST proxy, it needs to be base64 encoded. Which component needs to encode the binary data into base 64?

Options:

The Producer

The Kafka Broker

Zookeeper

The REST Proxy

Discussion 0

Questions 20

How much should be the heap size of a broker in a production setup on a machine with 256 GB of RAM, in PLAINTEXT mode?

Options:

4 GB

128 GB

16 GB

512 MB

Discussion 0

Questions 21

What client protocol is supported for the schema registry? (select two)

Options:

HTTP

HTTPS

JDBC

Websocket

SASL

Discussion 0

Questions 22

StreamsBuilder builder = new StreamsBuilder();

KStream textLines = builder.stream("word-count-input");

KTable wordCounts = textLines

.mapValues(textLine -> textLine.toLowerCase())

.flatMapValues(textLine -> Arrays.asList(textLine.split("\W+")))

.selectKey((key, word) -> word)

.groupByKey()

.count(Materialized.as("Counts"));

wordCounts.toStream().to("word-count-output", Produced.with(Serdes.String(), Serdes.Long()));

builder.build();

What is an adequate topic configuration for the topic word-count-output?

Options:

max.message.bytes=10000000

cleanup.policy=delete

compression.type=lz4

cleanup.policy=compact

Discussion 0

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