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What is the main purpose of using group.instance.id in Kafka consumer groups?

easy📝 Conceptual Q11 of 15
Kafka - Consumer Groups

What is the main purpose of using group.instance.id in Kafka consumer groups?

ATo increase the number of partitions in a topic
BTo encrypt messages within the consumer group
CTo automatically commit offsets more frequently
DTo assign a stable identity to a consumer and enable static group membership
Step-by-Step Solution
Solution:

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

    This configuration assigns a unique and stable identity to a Kafka consumer within a group.

  2. Step 2: Connect stable identity to static group membership

    With a stable identity, Kafka can avoid unnecessary rebalances when a consumer restarts briefly, improving stability.

  3. Final Answer:

    To assign a stable identity to a consumer and enable static group membership -> Option D

  4. Quick Check:

    Stable consumer identity = static group membership [OK]
Quick Trick: Static membership means stable consumer ID to avoid rebalances [OK]
Common Mistakes:
  • Confusing group.instance.id with partition count
  • Thinking it controls offset commit frequency
  • Assuming it encrypts messages

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