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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. You need to configure a sink connector to write records that fail into a dead letter queue topic. Requirements:
Topic name: DLQ-Topic
Headers containing error context must be added to the messagesWhich three configuration parameters are necessary?(Select three.)

A) errors.log.include.messages=true
B) errors.tolerance=all
C) errors.deadletterqueue.context.headers.enable=true
D) errors.log.enable=true
E) errors.deadletterqueue.topic.name=DLQ-Topic
F) errors.tolerance=none

2. Your Kafka cluster has five brokers. The topic t1 on the cluster has:
Two partitions
Replication factor = 4
min.insync.replicas = 3You need strong durability guarantees for messages written to topic t1.You configure a producer acks=all and all the replicas for t1 are in-sync.How many brokers need to acknowledge a message before it is considered committed?

A) 4
B) 2
C) 5
D) 3

3. (You are writing to a Kafka topic with producer configuration acks=all.
The producer receives acknowledgements from the broker but still creates duplicate messages due to network timeouts and retries.
You need to ensure that duplicate messages are not created.
Which producer configuration should you set?)

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

4. A stream processing application is consuming from a topic with five partitions. You run three instances of the application. Each instance has num.stream.threads=5.
You need to identify the number of stream tasks that will be created and how many will actively consume messages from the input topic.

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

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

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