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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions (Q56-Q61):
NEW QUESTION # 56
You are building a system for a retail store selling products to customers.
Which three datasets should you model as a GlobalKTable?
(Select three.)
- A. Customer profile information
- B. Log of payment transactions
- C. All purchases at a retail store occurring in real time
- D. Catalog of products
- E. Inventory of products at a warehouse
Answer: A,D,E
Explanation:
AGlobalKTableis a replicated, read-only table available in full on all instances. It's best forreference or lookup datasetssuch as:
* Product catalog
* Customer profiles
* Warehouse inventory
FromKafka Streams Developer Guide:
"Use GlobalKTable when you need to perform joins using non-partition-aligned reference data that's small enough to replicate."
* Purchases and transactions are high-throughput, time-sensitive streams, not static reference data.
Reference:Kafka Streams Concepts > GlobalKTable
NEW QUESTION # 57
The producer code below features a Callback class with a method called onCompletion().
In the onCompletion() method, when the request is completed successfully, what does the value metadata.offset() represent?
- A. Its position in the producer's batch of messages
- B. The number of bytes that overflowed beyond a producer batch of messages
- C. The sequential ID of the message committed into a partition
- D. The ID of the partition to which the message was committed
Answer: C
Explanation:
The offset in the RecordMetadata object returned by the producerrepresents the position of the record in the partition- i.e., thesequential IDassigned by Kafka once the message is committed.
FromKafka Producer API Documentation:
"The offset is the position of the record in the partition. This is a unique, sequential number assigned by the broker."
* D refers to metadata.partition(), not offset().
* B and C are unrelated to how Kafka handles committed offsets.
Reference:Kafka Producer Java API > RecordMetadata
NEW QUESTION # 58
You are building a system for a retail store to sell products to customers Which dataset should be modeled as a GlobatKTable? (Choose 3.)
- A. All purchases at a retail store occurring in real time
- B. Customer profile information
- C. Inventory of products at a warehouse e.g 100 items left
- D. Catalog of products
- E. Log of payment transactions
Answer: C,D,E
NEW QUESTION # 59
A consumer has auto.offset.reset=latest, and the topic partition currently has data for offsets going from 45 to 2311. The consumer group never committed offsets for the topic before. Where will the consumer read from?
- A. offset 2311
- B. offset 0
- C. it will crash
- D. offset 45
Answer: A
Explanation:
Latest means that data retrievals will start from where the offsets currently end
NEW QUESTION # 60
How do you create a topic named test with 3 partitions and 3 replicas using the Kafka CLI?
- A. bin/kafka-topics.sh --create --bootstrap-server localhost:2181 --replication-factor 3 --partitions 3 --topic test
- B. bin/kafka-topics.sh --create --broker-list localhost:9092 --replication-factor 3 --partitions 3 --topic test
- C. bin/kafka-topics-create.sh --zookeeper localhost:9092 --replication-factor 3 --partitions 3 --topic test
- D. bin/kafka-topics.sh --create --bootstrap-server localhost:9092 --replication-factor 3 --partitions 3 --topic test
Answer: D
Explanation:
As of Kafka 2.3, the kafka-topics.sh command can take --bootstrap-server localhost:9092 as an argument.
You could also use the (now deprecated) option of --zookeeper localhost:2181.
NEW QUESTION # 61
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