Confluent Confluent Certified Developer CCDAK Questions & Answers

• Question 141:

  Where are KSQL-related data and metadata stored?

  A. Kafka Topics

  B. Zookeeper

  C. PostgreSQL database

  D. Schema Registry

  Correct Answer: A

  metadata is stored in and built from the KSQL command topic. Each KSQL server has its own in-memory version of the metastore.

• Question 142:

  A kafka topic has a replication factor of 3 and min.insync.replicas setting of 2. How many brokers can go down before a producer with acks=all can't produce?

  A. 0

  B. 2

  C. 1

  D. 3

  Correct Answer: C

  acks=all and min.insync.replicas=2 means we must have at least 2 brokers up for the partition to be available

• Question 143:

  A consumer starts and has auto.offset.reset=none, and the topic partition currently has data for offsets going from 45 to 2311. The consumer group has committed the offset 10 for the topic before. Where will the consumer read from?

  A. offset 45

  B. offset 10

  C. it will crash

  D. offset 2311

  Correct Answer: C

  auto.offset.reset=none means that the consumer will crash if the offsets it's recovering from have been deleted from Kafka, which is the case here, as 10 < 45

• Question 144:

  Two consumers share the same group.id (consumer group id). Each consumer will

  A. Read mutually exclusive offsets blocks on all the partitions

  B. Read all the data on mutual exclusive partitions

  C. Read all data from all partitions

  Correct Answer: B

  Each consumer is assigned a different partition of the topic to consume.

• Question 145:

  There are 3 brokers in the cluster. You want to create a topic with a single partition that is resilient to one broker failure and one broker maintenance. What is the replication factor will you specify while creating the topic?

  A. 6

  B. 3

  C. 2

  D. 1

  Correct Answer: B

  1 is not possible as it doesn't provide resilience to failure, 2 is not enough as if we take a broker down for maintenance, we cannot tolerate a broker failure, and 6 is impossible as we only have 3 brokers (RF cannot be greater than the number of brokers). Here the correct answer is 3

• Question 146:

  When using plain JSON data with Connect, you see the following error messageorg.apache.kafka.connect.errors.DataExceptionJsonDeserializer with schemas.enable requires

  "schema" and "payload" fields and may not contain additional fields. How will you fix the error?

  A. Set key.converter, value.converter to JsonConverter and the schema registry url

  B. Use Single Message Transforms to add schema and payload fields in the message

  C. Set key.converter.schemas.enable and value.converter.schemas.enable to false

  D. Set key.converter, value.converter to AvroConverter and the schema registry url

  Correct Answer: C

  You will need to set the schemas.enable parameters for the converter to false for plain text with no schema.

• Question 147:

  What is the disadvantage of request/response communication?

  A. Scalability

  B. Reliability

  C. Coupling

  D. Cost

  Correct Answer: C

  Point-to-point (request-response) style will couple client to the server.

• Question 148:

  is KSQL ANSI SQL compliant?

  A. Yes

  B. No

  Correct Answer: B

  KSQL is not ANSI SQL compliant, for now there are no defined standards on streaming SQL languages

• Question 149:

  What happens when broker.rack configuration is provided in broker configuration in Kafka cluster?

  A. You can use the same broker.id as long as they have different broker.rack configuration

  B. Replicas for a partition are placed in the same rack

  C. Replicas for a partition are spread across different racks

  D. Each rack contains all the topics and partitions, effectively making Kafka highly available

  Correct Answer: C

  Partitions for newly created topics are assigned in a rack alternating manner, this is the only change broker.rack does

• Question 150:

  Where are the dynamic configurations for a topic stored?

  A. In Zookeeper

  B. In an internal Kafka topic __topic_configuratins

  C. In server.properties

  D. On the Kafka broker file system

  Correct Answer: A

  Dynamic topic configurations are maintained in Zookeeper.