Given a Kafka consumer configured with auto-commit disabled, what will happen if the consumer crashes before committing offsets?

medium📝 Predict Output Q4 of 15

Kafka - Consumers

AThe consumer will automatically commit offsets on restart

BThe consumer will lose all messages and start from the beginning

CThe consumer will resume from the last committed offset on restart

DThe consumer will skip uncommitted messages

Step-by-Step Solution

Solution:

Step 1: Understand offset commit behavior with auto-commit disabled
When auto-commit is disabled, offsets are only saved when the consumer explicitly commits them.
Step 2: Analyze crash impact before committing offsets
If the consumer crashes before committing, on restart it resumes from the last committed offset, reprocessing uncommitted messages.
Final Answer:
The consumer will resume from the last committed offset on restart -> Option C
Quick Check:
Auto-commit disabled crash = resume from last commit [OK]

Quick Trick: Without commit, consumer reprocesses messages after crash [OK]

Common Mistakes:

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