Minimum number of Coordinating nodes

Elastic Stack Elasticsearch
1

Would like to know the recommended number ( 2 or 3) of coordinating only nodes for an elasticsearch cluster which will have around 4.5 TB of data.

2

You don't necessarily need any coordinating nodes at all. Sometimes one is used together with Kibana, but many deployments do fine without them.

3

Thanks. We are planning to use the coordinating nodes along with Kibana and question is whether to use 2 or 3.

4

How many Kibana instances will you have?

5

Each coordinating node will have one Kibana instance.

6

Dedicated master nodes should always be 3 in order to be able to reach consensus even with a node missing. That is not an issue for coordinating nodes, so 2 is most likely sufficient.

7

Thanks. Whether 2 coordinating nodes are always sufficient irrespective of the data volume? (50TB or 100TB..etc) Also what is the typical resource configuration - CPU cores, RAM and disk space for coordinating nodes.

8

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