Confluent Confluent Certifications CCDAK Questions & Answers

• Question 61:

  How will you find out all the partitions without a leader?

  A. kafka-topics.sh --broker-list localhost:9092 --describe --under-replicated-partitions

  B. kafka-topics.sh --bootstrap-server localhost:2181 --describe --unavailable-partitions

  C. kafka-topics.sh --zookeeper localhost:2181 --describe --unavailable-partitions

  D. kafka-topics.sh --zookeeper localhost:2181 --describe --under-replicated-partitions

  Correct Answer: C

  Please note that as of Kafka 2.2, the --zookeeper option is deprecated and you can now usekafka-topics.sh --bootstrap-server localhost:9092 --describe --unavailable-partitions

• Question 62:

  Which of the following statements are true regarding the number of partitions of a topic?

  A. The number of partitions in a topic cannot be altered

  B. We can add partitions in a topic by adding a broker to the cluster

  C. We can add partitions in a topic using the kafka-topics.sh command

  D. We can remove partitions in a topic by removing a broker

  E. We can remove partitions in a topic using the kafka-topics.sh command

  Correct Answer: C

  We can only add partitions to an existing topic, and it must be done using the kafka- topics.sh command

• Question 63:

  What is true about replicas?

  A. Produce requests can be done to the replicas that are followers

  B. Produce and consume requests are load-balanced between Leader and Follower replicas

  C. Leader replica handles all produce and consume requests

  D. Follower replica handles all consume requests

  Correct Answer: C

  Replicas are passive - they don't handle produce or consume request. Produce and consume requests get sent to the node hosting partition leader.

• Question 64:

  There are 3 producers writing to a topic with 5 partitions. There are 5 consumers consuming from the topic. How many Controllers will be present in the cluster?

  A. 3

  B. 5

  C. 2

  D. 1

  Correct Answer: D

  There is only one controller in a cluster at all times.

• Question 65:

  You have a Zookeeper cluster that needs to be able to withstand the loss of 2 servers and still be able to function. What size should your Zookeeper cluster have?

  A. 4

  B. 5

  C. 2

  D. 3

  E. 6

  Correct Answer: B

  Your Zookeeper cluster needs to have an odd number of servers, and must maintain a majority of servers up to be able to vote. Therefore, a 2N+1 zookeeper cluster can survive to N zookeeper being down, so here the right answer is N=2, 2*N+1=5

• Question 66:

  The Controller is a broker that is... (select two)

  A. elected by Zookeeper ensemble

  B. is responsible for partition leader election

  C. elected by broker majority

  D. is responsible for consumer group rebalances

  Correct Answer: AB

  Controller is a broker that in addition to usual broker functions is responsible for partition leader election. The election of that broker happens thanks to Zookeeper and at any time only one broker can be a controller

• Question 67:

  In Avro, adding a field to a record without default is a __ schema evolution

  A. forward

  B. backward

  C. full

  D. breaking

  Correct Answer: A

  Clients with old schema will be able to read records saved with new schema.

• Question 68:

  You are using JDBC source connector to copy data from 3 tables to three Kafka topics. There is one connector created with max.tasks equal to 2 deployed on a cluster of 3 workers. How many tasks are launched?

  A. 2

  B. 1

  C. 3

  D. 6

  Correct Answer: A

  here, we have three tables, but the max.tasks is 2, so that's the maximum number of tasks that will be created

• Question 69:

  What's is true about Kafka brokers and clients from version 0.10.2 onwards?

  A. Clients and brokers must have the exact same version to be able to communicate

  B. A newer client can talk to a newer broker, but an older client cannot talk to a newer broker

  C. A newer client can talk to a newer broker, and an older client can talk to a newer broker

  D. A newer client can't talk to a newer broker, but an older client can talk to a newer broker

  Correct Answer: C

  Kafka's new bidirectional client compatibility introduced in 0.10.2 allows this. Read more herehttps://www.confluent.io/blog/upgrading-apache-kafka-clients-just-got-easier/

• Question 70:

  When using the Confluent Kafka Distribution, where does the schema registry reside?

  A. As a separate JVM component

  B. As an in-memory plugin on your Zookeeper cluster

  C. As an in-memory plugin on your Kafka Brokers

  D. As an in-memory plugin on your Kafka Connect Workers

  Correct Answer: A

  Schema registry is a separate application that provides RESTful interface for storing and retrieving Avro schemas.