Given a Kafka producer with transactions enabled, what happens if producer.commitTransaction() is not called after producer.beginTransaction()?

medium📝 Predict Output Q4 of Q15

Kafka - Message Delivery Semantics

Given a Kafka producer with transactions enabled, what happens if producer.commitTransaction() is not called after producer.beginTransaction()?

AMessages are immediately visible to consumers without transaction commit

BThe transaction remains open and messages are not visible to consumers

CProducer throws a syntax error and stops

DMessages are lost and never stored in Kafka

Step-by-Step Solution

Solution:

Step 1: Understand transaction lifecycle in Kafka producer
After beginTransaction(), messages are buffered and not visible until commitTransaction() is called.
Step 2: Consequence of missing commitTransaction()
Without commit, the transaction stays open and messages remain invisible to consumers.
Final Answer:
The transaction remains open and messages are not visible to consumers -> Option B
Quick Check:
Missing commitTransaction = messages hidden [OK]

Quick Trick: Always call commitTransaction to publish messages [OK]

Common Mistakes:

MISTAKES

Master "Message Delivery Semantics" in Kafka

9 interactive learning modes - each teaches the same concept differently

Want More Practice?

15+ quiz questions · All difficulty levels · Free

More Kafka Quizzes