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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

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

2. Your application is consuming from a topic with one consumer group.
The number of running consumers is equal to the number of partitions.
Application logs show that some consumers are leaving the consumer group during peak time, triggering a rebalance. You also notice that your application is processing many duplicates.
You need to stop consumers from leaving the consumer group.
What should you do?

A) Reduce max.poll.records property.
B) Add more consumer instances.
C) Split consumers in different consumer groups.
D) Increase session.timeout.ms property.

3. You use Kafka Connect with the JDBC source connector to extract data from a large database and push it into Kafka.
The database contains tens of tables, and the current connector is unable to process the data fast enough.
You add more Kafka Connect workers, but throughput doesn't improve.
What should you do next?

A) Add more Kafka brokers to the cluster.
B) Increase the number of Kafka partitions for the topics.
C) Increase the value of the connector's property tasks.max.
D) Modify the database schemas to enable horizontal sharding.

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

5. What is the default maximum size of a message the Apache Kafka broker can accept?

A) 2MB
B) 1MB
C) 5MB
D) 10MB

Solutions: