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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. An ecommerce wesbite sells some custom made goods. What's the natural way of modeling this data in Kafka streams?

A) Purchase as table, Product as table, Customer as table
B) Purchase as stream, Product as table, Customer as stream
C) Purchase as stream, Product as stream, Customer as stream
D) Purchase as stream, Product as table, Customer as table

2. A stream processing application is consuming from a topic that has five partitions. You run three instances of your application, each with num.streams.threads set to five.
You need to identify the amount of total stream tasks that will be created and the amount that will be actively consuming messages from the input topic.
Which option is correct?

A) 5 created, 1 actively consuming
B) 15 created, 5 actively consuming
C) 15 created, 15 actively consuming
D) 5 created, 5 actively consuming

3. What is the difference between exactly once semantics (EOS) and idempotence?

A) Idempotence Is any function that can be executed several times without changing the final result beyond its first iteration. EOS sends an update once and only one time.
B) Idempotence sends an update once and only one item. EOS is any function that can be executed several times without changing the final result beyond its first iteration
C) Idempotence sends an update multiple times and only keeps the latest update EOS requests get sent multiple times, but only the first request is accepted.
D) Idempotence sends updates multiple times and stores the first value. EOS sends updates multiple times and stores the latest value.

4. A topic has three replicas and you set min.insync.replicas to 2. If two out of three replicas are not available, what happens when a consume request is sent to broker?

A) NotEnoughReplicasException will be returned
B) Data will be returned from the remaining in-sync replica
C) An empty message will be returned
D) A new leader for the partition will be elected

5. How often is log compaction evaluated?

A) Every time a segment is closed
B) Every time a message is sent to Kafka
C) Every time a new partition is created
D) Every time a message is flushed to disk

Solutions: