[Solved] Given the following Kafka consumer code snippet with auto-commit enabled:Properties props = new Properties(); props.... }What happens if the consumer crashes immediately after this code runs? | Kafka

Kafka - Consumers

Given the following Kafka consumer code snippet with auto-commit enabled:

Properties props = new Properties();
props.put("enable.auto.commit", "true");
props.put("auto.commit.interval.ms", "1000");
KafkaConsumer consumer = new KafkaConsumer<>(props);
consumer.subscribe(List.of("topic1"));
ConsumerRecords records = consumer.poll(Duration.ofMillis(100));
for (ConsumerRecord record : records) {
    System.out.println(record.value());
}

What happens if the consumer crashes immediately after this code runs?

AOffsets are committed automatically, so no duplicate processing occurs

BOffsets are not committed, so messages may be reprocessed

CConsumer throws an exception due to missing manual commit

DConsumer stops consuming messages permanently

Step-by-Step Solution

Solution:

Step 1: Understand auto-commit timing
Auto-commit commits offsets at intervals (here every 1000 ms), not immediately after poll.
Step 2: Analyze crash timing effect
If the consumer crashes before the next auto-commit, offsets are not committed, causing possible reprocessing.
Final Answer:
Offsets are not committed, so messages may be reprocessed -> Option B
Quick Check:
Crash before auto-commit interval = possible duplicate processing [OK]

Quick Trick: Auto-commit interval delays offset commit; crash may cause duplicates [OK]

Common Mistakes:

Assuming offsets commit immediately after poll
Confusing auto-commit with manual commit
Believing consumer crashes stop message consumption forever

Master "Consumers" in Kafka

9 interactive learning modes - each teaches the same concept differently

Learn Why Deep Visual Try Challenge Project Recall Time

More Kafka Quizzes

Given the following Kafka consumer code snippet with auto-commit enabled:

Step 1: Understand auto-commit timing

Step 2: Analyze crash timing effect

Final Answer:

Quick Check:

Want More Practice?