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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. (Your application consumes from a topic configured with a deserializer.
You want the application to be resilient to badly formatted records (poison pills).
You surround the poll() call with a try/catch block for RecordDeserializationException.
You need to log the bad record, skip it, and continue processing other records.
Which action should you take in the catch block?)

A) Throw a runtime exception to trigger a restart of the application.
B) Log the bad record and seek the consumer to the offset of the next record.
C) Log the bad record; no other action is needed.
D) Log the bad record and call consumer.skip() method.

2. (A stream processing application tracks user activity in online shopping carts, including items added, removed, and ordered throughout the day for each user.
You need to capture data to identify possible periods of user inactivity.
Which type of Kafka Streams window should you use?)

A) Sliding
B) Hopping
C) Tumbling
D) Session

3. (You want to read messages from all partitions of a topic in every consumer instance of your application.
How do you do this?)

A) Use the assign() method using all topic-partitions of the topic as argument.
B) Use the subscribe() method with an empty consumer group name configuration.
C) Use the assign() method with the topic name as argument.
D) Use the subscribe() method with a regular expression argument.

4. You want to connect with username and password to a secured Kafka cluster that has SSL encryption.
Which properties must your client include?

A) security.protocol=PLAINTEXTsasl.jaas.config=org.apache.kafka.common.security.ssl.
TlsLoginModule required username='myUser' password='myPassword';
B) security.protocol=SASL_SSLsasl.jaas.config=org.apache.kafka.common.security.plain.
PlainLoginModule required username='myUser' password='myPassword';
C) security.protocol=SSLsasl.jaas.config=org.apache.kafka.common.security.plain.PlainLoginModule required username='myUser' password='myPassword';
D) security.protocol=SASL_PLAINTEXTsasl.jaas.config=org.apache.kafka.common.security.plain.
PlainLoginModule required username='myUser' password='myPassword';

5. You need to correctly join data from two Kafka topics.
Which two scenarios will allow for co-partitioning?
(Select two.)

A) Both topics have the same value schema.
B) Both topics have the same key and partitioning strategy.
C) Both topics have the same retention time.
D) Both topics have the same number of partitions.

Solutions: