Given the following Kafka consumer code snippet, what will be the output if the consumer is subscribed to topic "news" and there are two messages "Hello" and "World" in the topic?

medium📝 Predict Output Q13 of 15

Kafka - Consumers

consumer.subscribe(["news"])
records = consumer.poll(timeout_ms=1000)
for record in records:
    print(record.value)

A['Hello', 'World']

BHello\nWorld

CHelloWorld

DNo output because poll() is missing a loop

Step-by-Step Solution

Solution:

Step 1: Understand subscribe() and poll() behavior
The consumer subscribes to "news" and calls poll() once, which fetches available messages.
Step 2: Analyze the for loop printing each record
The loop prints each message value on its own line, so "Hello" and "World" appear separately.
Final Answer:
Hello\nWorld -> Option B
Quick Check:
poll() returns messages, loop prints each [OK]

Quick Trick: poll() returns messages; loop prints each on new line [OK]

Common Mistakes:

Thinking poll() returns a list printed directly
Assuming messages print concatenated without newline
Believing poll() needs a loop to work at all

Master "Consumers" in Kafka

9 interactive learning modes - each teaches the same concept differently

Learn Why Deep Visual Try Challenge Project Recall Time

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions

More Kafka Quizzes

Given the following Kafka consumer code snippet, what will be the output if the consumer is subscribed to topic "news" and there are two messages "Hello" and "World" in the topic?

Step 1: Understand subscribe() and poll() behavior

Step 2: Analyze the for loop printing each record

Final Answer:

Quick Check:

Want More Practice?