Kafka - Consumers
Given the following Kafka consumer configuration snippet, what will be the behavior if auto.offset.reset is set to earliest and the consumer group is new?
props.put("auto.offset.reset", "earliest");Given the following Kafka consumer configuration snippet, what will be the behavior if auto.offset.reset is set to earliest and the consumer group is new?
medium📝 Predict Output Q4 of 15
Step-by-Step Solution
Solution:
Step 1: Understand
This setting controls where to start reading if no committed offset exists for the group.auto.offset.resetbehaviorStep 2: Interpret the value
When set toearliestearliest, the consumer reads from the beginning of the topic if the group is new.Final Answer:
Consumer starts reading from the earliest available offset -> Option BQuick Check:
auto.offset.reset=earliest means read from start if no offset [OK]
Quick Trick: earliest reads from start if no committed offset [OK]
Common Mistakes:
- Assuming it reads from latest always
- Expecting an error on new group
- Ignoring committed offset logic
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