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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. You create a topic named stream-logs with:
A replication factor of 3
Four partitions
Messages that are plain logs without a keyHow will messages be distributed across partitions?

A) Messages will be distributed among all the topic partitions with strict ordering.
B) All messages will be written to the same log segment.
C) Messages will be distributed round-robin among all the topic partitions.
D) The first message will always be written to partition 0.

2. (You need to set alerts on key broker metrics to trigger notifications when a Kafka cluster is unhealthy.
What are three minimum broker metrics to monitor for cluster health?
Select three.)

A) kafka.controller:type=ControllerStats,name=UncleanLeaderElectionsPerSec
B) kafka.controller:type=KafkaController,name=OfflinePartitionsCount
C) kafka.controller:type=KafkaController,name=ActiveControllerCount
D) kafka.controller:type=KafkaController,name=LastCommittedRecordOffset
E) kafka.controller:type=KafkaController,name=TopicsToDeleteCount

3. What are three built-in abstractions in the Kafka Streams DSL?
(Select three.)

A) GlobalKStream
B) StreamTable
C) KStream
D) KTable
E) GlobalKTable

4. (You need to send a JSON message on the wire. The message key is a string.
How would you do this?)

A) Specify a value serializer class for the JSON contents of the message's value. Set a key serializer for the string value.
B) Specify a key serializer class for the JSON contents of the message's value. Set the value serializer class to null.
C) Specify a value serializer class for the JSON contents of the message's value. Set the key serializer class to JSON.
D) Specify a value serializer class for the JSON contents of the message's value. Set the key serializer class to null.

5. You are writing to a topic with acks=all.
The producer receives acknowledgments but you notice duplicate messages.
You find that timeouts due to network delay are causing resends.
Which configuration should you use to prevent duplicates?

A) retries=2147483647max.in.flight.requests.per.connection=5enable.idempotence=true
B) retries=2147483647max.in.flight.requests.per.connection=1enable.idempotence=false
C) retries=0max.in.flight.requests.per.connection=5enable.idempotence=true
D) enable.auto.commit=true

Solutions: