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What is the purpose of setting group.id in Kafka consumer configuration?

easy📝 Conceptual Q11 of 15
Kafka - Consumers

What is the purpose of setting group.id in Kafka consumer configuration?

ATo specify the Kafka broker address
BTo define the message deserializer class
CTo identify the consumer group for coordinating message consumption
DTo set the maximum number of messages to fetch
Step-by-Step Solution
Solution:

  1. Step 1: Understand the role of group.id

    The group.id identifies the consumer group that the consumer belongs to, allowing Kafka to coordinate message consumption among multiple consumers.

  2. Step 2: Differentiate from other configurations

    Other options like broker address or deserializer do not relate to consumer group coordination.

  3. Final Answer:

    To identify the consumer group for coordinating message consumption -> Option C

  4. Quick Check:

    group.id = consumer group ID [OK]
Quick Trick: group.id always sets the consumer group name [OK]
Common Mistakes:
  • Confusing group.id with broker address
  • Thinking group.id sets deserializer
  • Assuming group.id controls message fetch size

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