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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. A producer application in a developer machine was able to send messages to a Kafka topic. After copying the producer application into another developer's machine, the producer is able to connect to Kafka but unable to produce to the same Kafka topic because of an authorization issue. What is the likely issue?

A) The Kafka Broker needs to be rebooted
B) You cannot copy a producer application from one machine to another
C) Broker configuration needs to be changed to allow a different producer
D) The Kafka ACL does not allow another machine IP

2. Refer to the producer code below. It features a 'Callback' class with a method called 'onCompletion()'.
In the 'on Completion*.)' method, what does the 'metadata.offset()' value represent?

producer.send(record, new MyCallback(record));

A) The id of the partition that the message was committed to
B) The number of bytes that overflowed beyond a producer batch of messages
C) Its position in the producer's batch of messages
D) The sequential id of the message is committed into a partition

3. How do you read a table or stream from the beginning of a topic?

A) SET 'auto.offset.reset' = 'earliest';
SELECT STRUCT(f1 := v1, f2 := v2) FROM s1 EMIT CHANGES;
B) id as orderId
C) itemId as itemId,
D) id as shipmentId,
E) CREATE STREAM shipped_orders AS
SELECT
F) SELECT STRUCT(f1 := v1, f2 := v2) FROM s1 EMIT CHANGES;
G) id as paymentId
FROM orders o
INNER JOIN payments p WITHIN 1 HOURS ON p.id = o.id
INNER JOIN shipments s WITHIN 2 HOURS ON s.id
= o.id;
H) SET 'auto.offset.reset' = 'latest';
SELECT STRUCT(f1 := v1, f2 := v2) FROM s1 EMIT CHANGES;

4. If a topic has a replication factor of 3...

A) 3 replicas of the same data will live on 1 broker
B) Each partition will live on 3 different brokers
C) Each partition will live on 2 different brokers
D) Each partition will live on 4 different brokers

5. Kafka producers can batch messages going to the same partition.
Which statement is correct about producer batching?

A) Producers can only batch messages of the same size.
B) Producers have a separate background thread for each batch.
C) Two or more broker failures will automatically disable batching on the producer.
D) Producers can include multiple batches in a single request to a broker.

Solutions: