I'm studying kafka and I see that a lot of articles about it are talking about kafka cluster with 3 nodes. And I'm curious why 3 nodes?
Do we have something technically specific about this number ?
1 Answers
This is all about high availability, the recommended replication factor for Kafka is 3, meaning that you are going to have 3 replicas for every piece of data sent to your cluster. If you have only 1 node, and that node crashes or has HW issues such as disk issues, probably you will lose all your data, as opposed to have healthy replicas on the other 2 nodes.
Here there are some additional explanations about it as well Kafka replicas
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