If you run kafka-console-consumer.sh --topic my-topic --from-beginning --bootstrap-server localhost:9092 and the topic has 5 messages, what will happen?

medium📝 Predict Output Q5 of 15

Kafka - Basics and Event Streaming

If you run kafka-console-consumer.sh --topic my-topic --from-beginning --bootstrap-server localhost:9092 and the topic has 5 messages, what will happen?

AThe command will fail with an error

BOnly new messages after the command starts will be printed

CNo messages will be printed

DAll 5 messages will be printed from the start

Step-by-Step Solution

Solution:

Step 1: Understand the --from-beginning flag
This flag tells the consumer to read all messages from the start of the topic.
Step 2: Apply to the topic with 5 messages
Since the topic has 5 messages, all will be printed on running the command.
Final Answer:
All 5 messages will be printed from the start -> Option D
Quick Check:
--from-beginning prints all existing messages [OK]

Quick Trick: Use --from-beginning to read all past messages [OK]

Common Mistakes:

Assuming only new messages print
Thinking command fails without extra flags
Expecting no output if topic exists

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More Kafka Quizzes

If you run kafka-console-consumer.sh --topic my-topic --from-beginning --bootstrap-server localhost:9092 and the topic has 5 messages, what will happen?

Step 1: Understand the --from-beginning flag

Step 2: Apply to the topic with 5 messages

Final Answer:

Quick Check:

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