[Solved] Given the following code snippet, what topics will the consumer be subscribed to? consumer.subscribe(Arrays.asList("topicA", "topicB")); consumer.subscribe(Collections.singletonList("topicC")); | Kafka

Kafka - Consumers

Given the following code snippet, what topics will the consumer be subscribed to?

consumer.subscribe(Arrays.asList("topicA", "topicB"));
consumer.subscribe(Collections.singletonList("topicC"));

AThe consumer subscribes only to "topicA" and "topicB".

BThe consumer subscribes to "topicA", "topicB", and "topicC".

CThe consumer subscribes only to "topicC".

DThe consumer subscribes to none of the topics.

Step-by-Step Solution

Solution:

Step 1: Understand how subscribe() works when called multiple times
Each call to subscribe() replaces the previous subscription list; it does not add to it.
Step 2: Analyze the code calls
The first call subscribes to "topicA" and "topicB". The second call overwrites this and subscribes only to "topicC".
Final Answer:
The consumer subscribes only to "topicC". -> Option C
Quick Check:
subscribe() overwrites previous topics [OK]

Quick Trick: Multiple subscribe() calls overwrite previous subscriptions [OK]

Common Mistakes:

Master "Consumers" in Kafka

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Given the following code snippet, what topics will the consumer be subscribed to?