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Why does Kafka Consumer API require specifying a consumer group id?

hard📝 Conceptual Q10 of 15
Kafka - Consumers
Why does Kafka Consumer API require specifying a consumer group id?
ATo identify the Kafka broker to connect to
BTo coordinate message consumption and load balancing among consumers
CTo specify the topic name for consumption
DTo set the message serialization format
Step-by-Step Solution
Solution:

  1. Step 1: Understand consumer group id role

    The group id identifies a set of consumers that share the work of consuming messages.

  2. Step 2: Explain coordination and load balancing

    Kafka uses group id to assign partitions to consumers, balancing load and ensuring no duplicate processing.

  3. Final Answer:

    To coordinate message consumption and load balancing among consumers -> Option B

  4. Quick Check:

    Group id enables consumer coordination and load balancing [OK]
Quick Trick: Group id groups consumers for coordinated consumption [OK]
Common Mistakes:
  • Confusing group id with broker address
  • Thinking group id is topic name
  • Mixing group id with serialization

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