Bird
0
0

What will be the output if a Kafka consumer reads from a topic with no new messages?

medium📝 Predict Output Q5 of 15
Kafka - Basics and Event Streaming
What will be the output if a Kafka consumer reads from a topic with no new messages?
AThe consumer will block and wait for new messages.
BThe consumer will restart automatically.
CThe consumer will throw an error and stop.
DThe consumer will return an empty batch immediately.
Step-by-Step Solution
Solution:

  1. Step 1: Understand consumer polling behavior

    Kafka consumers poll for messages and return batches of records.

  2. Step 2: Behavior when no new messages

    If no new messages exist, the consumer returns an empty batch without error or blocking indefinitely.

  3. Final Answer:

    The consumer will return an empty batch immediately. -> Option D

  4. Quick Check:

    No new messages = empty batch returned [OK]
Quick Trick: Consumers return empty batches if no messages found [OK]
Common Mistakes:
  • Expecting consumer to block forever
  • Assuming consumer throws error
  • Thinking consumer restarts automatically

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions
More Kafka Quizzes
Consumers - Auto-commit vs manual commit - Quiz 12easy Consumers - Consumer API basics - Quiz 8hard Consumers - Consumer API basics - Quiz 7medium Consumers - Subscribing to topics - Quiz 6medium Kafka Basics and Event Streaming - Why Kafka exists - Quiz 7medium Kafka Basics and Event Streaming - Message broker architecture - Quiz 15hard Kafka Cluster Architecture - Broker nodes - Quiz 13medium Kafka Cluster Architecture - ZooKeeper role (and KRaft replacement) - Quiz 1easy Topics and Partitions - Retention policies (time-based, size-based) - Quiz 2easy Topics and Partitions - Topic creation - Quiz 15hard