[Solved] Which of these is a valid way to subscribe a Kafka consumer to a single topic named "orders"? — Ans: consumer.subscribe(Collections.singletonList("orders")); | Kafka

Kafka - Consumers

Which of these is a valid way to subscribe a Kafka consumer to a single topic named "orders"?

Aconsumer.subscribe("orders");

Bconsumer.subscribe(Collections.singletonList("orders"));

Cconsumer.subscribe(["orders"]);

Dconsumer.subscribe("topic=orders");

Step-by-Step Solution

Solution:

Step 1: Check the subscribe() method signature
Kafka's subscribe() expects a collection of topic names, such as a List or Set.
Step 2: Validate each option
consumer.subscribe(Collections.singletonList("orders")); uses Collections.singletonList which is a valid List containing "orders". The other options use incorrect argument types or syntax.
Final Answer:
consumer.subscribe(Collections.singletonList("orders")); -> Option B
Quick Check:
subscribe() needs a collection of topics [OK]

Quick Trick: Use a list or set to subscribe to topics [OK]

Common Mistakes:

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Which of these is a valid way to subscribe a Kafka consumer to a single topic named "orders"?