Which of the following Kafka Streams operators are stateful? (Select all that apply)
Answer(s): B,C,D,F
https://kafka.apache.org/20/documentation/streams/developer-guide/dsl-api.html#stateful-transformations
A bank uses a Kafka cluster for credit card payments. What should be the value of the property unclean.leader.election.enable?
Answer(s): A
Setting unclean.leader.election.enable to true means we allow out-of-sync replicas to become leaders, we will lose messages when this occurs, effectively losing credit card payments and making our customers very angry.
A kafka topic has a replication factor of 3 and min.insync.replicas setting of 1. What is the maximum number of brokers that can be down so that a producer with acks=all can still produce to the topic?
Answer(s): C
Two brokers can go down, and one replica will still be able to receive and serve data
I am producing Avro data on my Kafka cluster that is integrated with the Confluent Schema Registry. After a schema change that is incompatible, I know my data will be rejected. Which component will reject the data?
The Confluent Schema Registry is your safeguard against incompatible schema changes and will be the component that ensures no breaking schema evolution will be possible. Kafka Brokers do not look at your payload and your payload schema, and therefore will not reject data
How will you read all the messages from a topic in your KSQL query?
Consumers can set auto.offset.reset property to earliest to start consuming from beginning. For KSQL, SET 'auto.offset.reset'='earliest';
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