[Solved] Given the following Kafka consumer configuration snippet, what will be the output... props.put("group.id", "my-group");Assuming this consumer starts fresh with no committed offsets, what happens? | Kafka

Kafka - Consumers

Given the following Kafka consumer configuration snippet, what will be the output behavior when consuming messages?

props.put("enable.auto.commit", "false");
props.put("auto.offset.reset", "earliest");
props.put("group.id", "my-group");

Assuming this consumer starts fresh with no committed offsets, what happens?

AConsumer reads messages from the earliest offset but does not auto-commit offsets

BConsumer reads messages from the latest offset and auto-commits offsets

CConsumer throws an error due to missing deserializer configuration

DConsumer reads messages from the earliest offset and auto-commits offsets

Step-by-Step Solution

Solution:

Step 1: Analyze enable.auto.commit setting
It is set to "false", so the consumer will not automatically commit offsets after reading messages.
Step 2: Analyze auto.offset.reset and group.id
With "earliest" and a new group "my-group", the consumer starts reading from the earliest messages available.
Final Answer:
Consumer reads messages from the earliest offset but does not auto-commit offsets -> Option A
Quick Check:
enable.auto.commit=false + earliest = read earliest, no auto commit [OK]

Quick Trick: enable.auto.commit=false means manual offset commit [OK]

Common Mistakes:

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Given the following Kafka consumer configuration snippet, what will be the output behavior when consuming messages?