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

1. A. forward
2. B. backward
3. C. full
4. D. breaking

Correct Answer: A
Clients with old schema will be able to read records saved with new schema.

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?

1. A. Create 8 consumers in the same group with 4 consumers for each application
2. B. Create two consumers groups for two applications with 8 consumers in each
3. C. Create two consumer groups for two applications with 4 consumers in each
4. D. Create four consumers in the same group, one for each partition - two for fulfilment and two for monitoring

Correct Answer: C
two partitions groups - one for each application so that all messages are delivered to both the application. 4 consumers in each as there are 4 partitions of the topic, and you cannot have more consumers per groups than the number of partitions (otherwise they will be inactive and wasting resources)

You want to send a message of size 3 MB to a topic with default message size configuration. How does KafkaProducer handle large messages?

1. A. KafkaProducer divides messages into sizes of max.request.size and sends them in order
2. B. KafkaProducer divides messages into sizes of message.max.bytes and sends them in order
3. C. MessageSizeTooLarge exception will be thrown, KafkaProducer will not retry and return exception immediately
4. D. MessageSizeTooLarge exception will be thrown, KafkaProducer retries until the number of retries are exhausted

Correct Answer: C
MessageSizeTooLarge is not a retryable exception.

The kafka-console-consumer CLI, when used with the default options

1. A. uses a random group id
2. B. always uses the same group id
3. C. does not use a group id

Correct Answer: A
If a group is not specified, the kafka-console-consumer generates a random consumer group.

A Zookeeper ensemble contains 5 servers. What is the maximum number of servers that can go missing and the ensemble still run?

1. A. 3
2. B. 4
3. C. 2
4. D. 1

Correct Answer: C
majority consists of 3 zk nodes for 5 nodes zk cluster, so 2 can fail