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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

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

2. (Which configuration is valid for deploying a JDBC Source Connector to read all rows from the orders table and write them to the dbl-orders topic?)

A) {"name": "jdbc-source","connector.class": "io.confluent.connect.jdbc.DdbcSourceConnector","tasks.
max": "1","connection.url": "jdbc:mysql://mysql:3306/dbl?user=user&useAutoAuth=true","topic.
prefix": "dbl-","table.whitelist": "orders"}
B) {"name": "jdbc-source","connector.class": "io.confluent.connect.jdbc.JdbcSourceConnector","tasks.
max": "1","connection.url": "jdbc:mysql://mysql:3306/dbl?user=user&password=pas","topic.prefix":
"dbl-","table.whitelist": "orders"}
C) {"name": "dbl-orders","connector.class": "io.confluent.connect.jdbc.DdbcSourceConnector","tasks.
max": "1","connection.url": "jdbc:mysql://mysql:3306/dbl?user=user&password=pas","topic.prefix":
"dbl-","table.blacklist": "ord*"}
D) {"name": "orders-connect","connector.class": "io.confluent.connect.jdbc.DdbcSourceConnector","tasks.
max": "1","connection.url": "jdbc:mysql://mysql:3306/dbl","topic.whitelist": "orders","auto.create":
"true"}

3. An application is consuming messages from Kafka.
The application logs show that partitions are frequently being reassigned within the consumer group.
Which two factors may be contributing to this?
(Select two.)

A) An instance of the application is crashing and being restarted.
B) The number of partitions does not match the number of application instances.
C) There is a storage issue on the broker.
D) There is a slow consumer processing application.

4. (You need to set alerts on key broker metrics to trigger notifications when a Kafka cluster is unhealthy.
What are three minimum broker metrics to monitor for cluster health?
Select three.)

A) kafka.controller:type=KafkaController,name=ActiveControllerCount
B) kafka.controller:type=KafkaController,name=TopicsToDeleteCount
C) kafka.controller:type=KafkaController,name=LastCommittedRecordOffset
D) kafka.controller:type=KafkaController,name=OfflinePartitionsCount
E) kafka.controller:type=ControllerStats,name=UncleanLeaderElectionsPerSec

5. You create a topic named stream-logs with:
A replication factor of 3
Four partitions
Messages that are plain logs without a keyHow will messages be distributed across partitions?

A) All messages will be written to the same log segment.
B) Messages will be distributed round-robin among all the topic partitions.
C) Messages will be distributed among all the topic partitions with strict ordering.
D) The first message will always be written to partition 0.

Solutions: