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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. (You are developing a Java application that includes a Kafka consumer.
You need to integrate Kafka client logs with your own application logs.
Your application is using the Log4j2 logging framework.
Which Java library dependency must you include in your project?)

A) None, the correct dependency will be added transitively by the Kafka client
B) SLF4J implementation for Log4j2 (org.apache.logging.log4j:log4j-slf4j-impl)
C) Just the Log4j2 dependency of the application
D) SLF4J implementation for Log4j 1.2 (org.slf4j:slf4j-log4j12)

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

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

3. (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": "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*"}
B) {"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"}
C) {"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"}
D) {"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"}

4. (An S3 source connector named s3-connector stopped running.
You use the Kafka Connect REST API to query the connector and task status.
One of the three tasks has failed.
You need to restart the connector and all currently running tasks.
Which REST request will restart the connector instance and all its tasks?)

A) POST /connectors/s3-connector/tasks/0/restart
B) POST /connectors/s3-connector/restart
C) POST /connectors/s3-connector/restart?includeTasks=true&onlyFailed=true
D) POST /connectors/s3-connector/restart?includeTasks=true

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

Solutions: