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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. You have a Kafka client application that has real-time processing requirements.
What are the most important metrics available in Kafka that you should monitor?

A) Consumer heartbeat rate to the group coordinator
B) Consumer lag between the brokers and the consumers
C) Aggregate incoming byte rate
D) Total time to serve requests to replica followers

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

A) Replicas for a partition are placed in the same rack
B) Replicas for a partition are spread across different racks
C) You can use the same broker.id as long as they have different broker.rack configuration
D) Each rack contains all the topics and partitions, effectively making Kafka highly available

3. In Kafka, what are Topics split into?

A) Chunks
B) Sub Topics
C) Partitions
D) Consumers

4. An ecommerce website maintains two topics - a high volume "purchase" topic with 5 partitions and low volume "customer" topic with 3 partitions. You would like to do a stream-table join of these topics. How should you proceed?

A) Do a KStream / KTable join after a repartition step
B) Model customer as a GlobalKTable
C) Repartition customer topic to have 5 partitions
D) Repartition the purchase topic to have 3 partitions

5. You create a producer that writes messages about bank account transactions from tens of thousands of different customers into a topic.
* Your consumers must process these messages with low latency and minimize consumer lag
* Processing takes ~6x longer than producing
* Transactions for each bank account must be processedin orderWhich strategy should you use?

A) Use a combination of the bank account number and the transaction timestamp as the message key.
B) Use the bank account number found in the message as the message key.
C) Use the timestamp of the message's arrival as its key.
D) Use a unique identifier such as a universally unique identifier (UUID) as the message key.

Solutions: