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What does In-sync replicas (ISR) mean in Kafka?

easy📝 Conceptual Q11 of 15
Kafka - Cluster Architecture
What does In-sync replicas (ISR) mean in Kafka?
AReplicas that are offline
BReplicas that never receive data
CReplicas that have the latest data from the leader
DReplicas that only store old data
Step-by-Step Solution
Solution:

  1. Step 1: Understand the role of ISR

    ISR are replicas that keep up-to-date with the leader's data.

  2. Step 2: Compare options

    Only Replicas that have the latest data from the leader correctly describes ISR as replicas with the latest data.

  3. Final Answer:

    Replicas that have the latest data from the leader -> Option C

  4. Quick Check:

    ISR = Latest data replicas [OK]
Quick Trick: ISR means replicas fully caught up with leader data [OK]
Common Mistakes:
  • Thinking ISR includes offline replicas
  • Confusing ISR with replicas that lag behind
  • Assuming ISR means replicas with old data

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