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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

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

2. (Your configuration parameters for a Source connector and Connect worker are:
* offset.flush.interval.ms=60000
* offset.flush.timeout.ms=500
* offset.storage.topic=connect-offsets
* offset.storage.replication.factor=-1
Which two statements match the expected behavior?
Select two.)

A) The connector will wait 500 ms before trying to commit offsets for tasks.
B) The offsets topic will use the broker default replication factor.
C) The connector will commit offsets to a topic called connect-offsets.
D) The connector will commit offsets to the broker default offsets topic.

3. You are writing a producer application and need to ensure proper delivery. You configure the producer with acks=all.
Which two actions should you take to ensure proper error handling?
(Select two.)

A) Check that producer.send() returned a RecordMetadata object and is not null.
B) Surround the call of producer.send() with a try/catch block to catch KafkaException.
C) Check the value of ProducerRecord.status().
D) Use a callback argument in producer.send() where you check delivery status.

4. Which configuration allows more time for the consumer poll to process records?

A) fetch.max.wait.ms
B) session.timeout.ms
C) heartbeat.interval.ms
D) max.poll.interval.ms

5. What are two examples of performance metrics?
(Select two.)

A) Number of active user sessions
B) Time of last failed login
C) Number of active users
D) total-login-attempts
E) fetch-rate
F) incoming-byte-rate

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