Given a Kafka cluster with replication factor 3 and min.insync.replicas set to 2, what happens if one broker fails during a disaster?

medium📝 Predict Output Q4 of 15

Kafka - Multi-Datacenter and Replication

AData is lost immediately due to insufficient replicas

BThe cluster continues to accept writes with no data loss

CThe cluster stops accepting writes until the broker recovers

DThe cluster automatically increases replication factor

Step-by-Step Solution

Solution:

Step 1: Understand replication and min.insync.replicas
Replication factor 3 means data is copied to 3 brokers; min.insync.replicas 2 means at least 2 must acknowledge writes.
Step 2: Analyze broker failure impact
If one broker fails, 2 replicas remain in sync, so writes continue safely.
Final Answer:
The cluster continues to accept writes with no data loss -> Option B
Quick Check:
Replication factor and min.insync.replicas ensure availability [OK]

Quick Trick: Writes continue if min.insync.replicas are available [OK]

Common Mistakes:

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