[Solved] What is wrong with this Kafka consumer group code snippet? props.put("group.id", "my-group"); props.put("enable.auto.commit", "false"); consumer.subscribe(Arrays.asList("my-topic")); consumer.... | Kafka

Kafka - Consumer Groups

What is wrong with this Kafka consumer group code snippet?

props.put("group.id", "my-group");
props.put("enable.auto.commit", "false");
consumer.subscribe(Arrays.asList("my-topic"));
consumer.poll(Duration.ofMillis(100));
// Missing commit after poll

AThe poll timeout is too long

BThe group.id is incorrectly set

CThe consumer subscribes to the wrong topic

DThe consumer never commits offsets, risking message reprocessing

Step-by-Step Solution

Solution:

Step 1: Analyze auto commit setting
Auto commit is disabled, so offsets must be committed manually.
Step 2: Check code for commit call
Code calls poll but does not commit offsets, so messages may be reprocessed on restart.
Final Answer:
The consumer never commits offsets, risking message reprocessing -> Option D
Quick Check:
Auto commit false needs manual commit [OK]

Quick Trick: Disable auto commit means manual commit needed [OK]

Common Mistakes:

Forgetting to commit offsets manually
Assuming auto commit is enabled by default
Ignoring poll timeout relevance

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More Kafka Quizzes

What is wrong with this Kafka consumer group code snippet?

Step 1: Analyze auto commit setting

Step 2: Check code for commit call

Final Answer:

Quick Check:

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