Kafka - Monitoring and Operations
You see this alert from Kafka monitoring:
Under-replicated partitions detected. What is the most likely cause?You see this alert from Kafka monitoring: Under-replicated partitions detected. What is the most likely cause?
medium📝 Troubleshoot Q14 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand under-replicated partitions
This alert means some replicas are behind the leader and not fully synced.Step 2: Eliminate other options
No partitions or all brokers offline would cause different alerts; consumer lag is unrelated.Final Answer:
Some replicas are not catching up with the leader. -> Option DQuick Check:
Under-replicated = replicas behind leader [OK]
Quick Trick: Under-replicated means replicas lag leader [OK]
Common Mistakes:
MISTAKES- Confusing consumer lag with replica lag
- Thinking no partitions cause this alert
- Assuming all brokers are offline
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