How to know when increase the number of master nodes?

Elastic Stack Elasticsearch
1

Hello everyone!

There is some guidelines to follow to scale my master nodes?
There is some metric to analyse to see if i need more master nodes on my cluster?

Thank you!

2

If you are using dedicated master nodes, 3 is generally the ideal number. There is generally no need to scale this up as your cluster grows.

The only reasons I can think of to move up to 5 or 7 dedicated master nodes is if you are deploying in a way that you want a dedicated master node per rack or Availability Zone and have more than 3 of these OR if you want to be able to lose more than one master node and still be able to have a fully functioning cluster.

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There can only be 1 active master, adding nodes help prevent split brain. All the others just receive updates for failover and are used to vote who is master

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