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You see this error in Kafka logs: "Not enough replicas are in ISR to satisfy min.insync.replicas". What is the likely cause?

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Kafka - Cluster Architecture
You see this error in Kafka logs: "Not enough replicas are in ISR to satisfy min.insync.replicas". What is the likely cause?
AThe consumer group is not committed
BThe leader replica is offline
CThe topic has zero partitions
DToo few replicas are currently in ISR compared to min.insync.replicas
Step-by-Step Solution
Solution:

  1. Step 1: Interpret the error message

    The error means the number of replicas in ISR is less than the configured minimum.

  2. Step 2: Match cause with options

    Too few replicas are currently in ISR compared to min.insync.replicas directly matches the error cause; other options are unrelated to ISR count.

  3. Final Answer:

    Too few replicas are currently in ISR compared to min.insync.replicas -> Option D

  4. Quick Check:

    ISR count below min.insync.replicas causes error [OK]
Quick Trick: Error means ISR count < min.insync.replicas [OK]
Common Mistakes:
  • Blaming leader offline instead of ISR count
  • Confusing consumer group commit with ISR errors
  • Thinking zero partitions cause this error

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