[Solved] Given this Kafka consumer code snippet:consumer.subscribe(List.of("orders")); ConsumerRecords records = consumer.... }What will be the output if the topic 'orders' has messages "order1", "order2"? | Kafka

Kafka - Event-Driven Architecture

Given this Kafka consumer code snippet:

consumer.subscribe(List.of("orders"));
ConsumerRecords records = consumer.poll(Duration.ofMillis(100));
for (var record : records) {
  System.out.println(record.value());
}

What will be the output if the topic 'orders' has messages "order1", "order2"?

ANo output because poll timeout is too short

Border1\norder2

COnly order1 is printed

DCompilation error due to var usage

Step-by-Step Solution

Solution:

Step 1: Understand consumer subscription and polling
The consumer subscribes to 'orders' and polls messages with a 100ms timeout.
Step 2: Check the for-loop output
All messages received in poll are printed line by line, so both "order1" and "order2" print.
Final Answer:
order1\norder2 -> Option B
Quick Check:
Polling returns all messages available [OK]

Quick Trick: poll() returns all available messages within timeout [OK]

Common Mistakes:

MISTAKES

Assuming poll timeout prevents message retrieval
Thinking var causes compile error in Java 17+
Expecting only one message printed

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More Kafka Quizzes

Given this Kafka consumer code snippet:

Step 1: Understand consumer subscription and polling

Step 2: Check the for-loop output

Final Answer:

Quick Check:

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