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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. Where are source connector offsets stored?

A) storage.offset.topic
B) topic.offset.config
C) offset, storage, partitions
D) offset.storage.topic

2. You create a topic named loT-Data with 10 partitions and replication factor of three.
A producer sends 1 MB messages compressed with Gzip.
Which two statements are true in this scenario?
(Select two.)

A) By default, compression is the producer's responsibility.
B) All compressed messages will be stored in the same topic partition.
C) The message is already compressed so it will not be serialized.
D) Compression type will be stored in batch attributes.

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

4. (Which configuration determines the maximum number of records a consumer can poll in a single call to poll()?)

A) max.poll.records.interval
B) fetch.max.records
C) max.poll.records
D) max.records.consumer

5. You create a producer that writes messages about bank account transactions from tens of thousands of different customers into a topic.
Your consumers must process these messages with low latency and minimize consumer lag Processing takes ~6x longer than producing Transactions for each bank account must be processed in orderWhich strategy should you use?

A) Use the bank account number found in the message as the message key.
B) Use a unique identifier such as a universally unique identifier (UUID) as the message key.
C) Use the timestamp of the message's arrival as its key.
D) Use a combination of the bank account number and the transaction timestamp as the message key.

Solutions: