Topic Replication Factor

Topics should have a replication factor > 1 (usually between 2 and 3)

This way if a Broker is down, another broker can serve the data.

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References

Topic Replication Factor Formula:: Number of Replicas for each Partition

The minimum replication factor is:: 1

The maximum replication factor is:: The number of brokers in a cluster

The recommended replication factor is at least:: 3

Kafka's controller assigns replicas in what way:: distributed evenly to ensure load balancing