[Solved] Given this snippet, what will be printed?while (true) { var records = consumer.poll(Duration.ofMillis(100)); for (var record : records) { System.out.println(record.value()); } break;... | Kafka

Kafka - Consumers

Given this snippet, what will be printed?

while (true) {
  var records = consumer.poll(Duration.ofMillis(100));
  for (var record : records) {
    System.out.println(record.value());
  }
  break;
}

Assuming the topic has messages with values "Hello" and "World".

AException thrown

Bnull

CNo output

DHello\nWorld

Step-by-Step Solution

Solution:

Step 1: Understand poll() fetches available messages
poll() returns ConsumerRecords containing messages "Hello" and "World".
Step 2: Loop prints each record's value
The for loop prints each message value on a new line.
Final Answer:
Hello\nWorld -> Option D
Quick Check:
poll() + for loop prints messages = Hello\nWorld [OK]

Quick Trick: For loop over records prints each message value [OK]

Common Mistakes:

Expecting null or no output
Forgetting to iterate over records
Assuming exception without cause

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More Kafka Quizzes

Given this snippet, what will be printed?

Step 1: Understand poll() fetches available messages

Step 2: Loop prints each record's value

Final Answer:

Quick Check:

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