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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions (Q237-Q242):

NEW QUESTION # 237
Refer to the producer code below. It features a 'Callback' class with a method called 'onCompletion()'. When will the 'onCompletion()' method be Invoked?

producer.send(record, new MyCallback(record));

A. When the producer batches the message
B. When the producer puts the message into its socket buffer
C. When a consumer sends an acknowledgement to the producer
D. When a broker sends an acknowledgement to the producer

Answer: D

NEW QUESTION # 238
Which two statements are correct about transactions in Kafka?
(Select two.)

A. Transactions are only possible when writing messages to a topic with single partition.
B. Information about producers and their transactions is stored in the _transaction_state topic.
C. Transactions guarantee at least once delivery of messages.
D. All messages from a failed transaction will be deleted from a Kafka topic.
E. Consumers can consume both committed and uncommitted transactions.

Answer: B,E

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
* #C. Consumers can consume both committed and uncommitted transactions.By default,Kafka consumers only read committed messagesif they are configured with isolation.level=read_committed.
However, if configured as read_uncommitted, theycan also consume uncommitted (potentially aborted) transactional messages.
From Kafka Documentation:
"The isolation.level setting controls whether the consumer will read only committed messages or all messages, including uncommitted messages from ongoing or aborted transactions."
* #D. Information about producers and their transactions is stored in the _transaction_state topic.
Kafka uses an internal topic named__transaction_stateto maintain metadata about producer transactions. This topic is essential for tracking thetransaction lifecycle, fencing, and recovery.
From Kafka Internals:
"Kafka stores the state of active and completed transactions in an internal topic called __transaction_state."

NEW QUESTION # 239
To prevent network-induced duplicates when producing to Kafka, I should use

A. max.in.flight.requests.per.connection=1
B. enable.idempotence=true
C. retries=200000
D. batch.size=1

Answer: B

Explanation:
Producer idempotence helps prevent the network introduced duplicates. More details herehttps://cwiki.apache.org/confluence/display/KAFKA/Idempotent+Producer

NEW QUESTION # 240
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. All purchases at a retail store occurring in real time
C. Catalog of products
D. Log of payment transactions
E. Inventory of products at a warehouse

Answer: A,C,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 # 241
We want the average of all events in every five-minute window updated every minute. What kind of Kafka Streams window will be required on the stream?

A. Tumbling window
B. Sliding window
C. Hopping window
D. Session window

Answer: C

Explanation:
A hopping window is defined by two propertiesthe window's size and its advance interval (aka "hop"), e.g., a hopping window with a size 5 minutes and an advance interval of 1 minute.

NEW QUESTION # 242
......

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