Minimum number of nodes for availability: 2 or 3?

Elastic Stack Elasticsearch
1

Hi all,
So what is the minimum number of nodes to have in a cluster to be nicely
available? 2 or 3?

I think that two may be insufficient because if the nodes go out of
communication with each other you run the risk of the split brain problem.
The mitigation here is to have 3 nodes (with minimum master nodes set to 2).

I suppose an alternative is to have a small routing only node to help with
master election and 2 storage nodes.

Is my understanding sound or am I missing something?

Many thanks,
Edward

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2

I prefer to have 3 nodes (data and master).

My 2 cents

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David :wink:
Twitter : @dadoonet / @elasticsearchfr / @scrutmydocs

Le 18 juin 2013 à 18:48, Edward Sargisson esarge@pobox.com a écrit :

Hi all,
So what is the minimum number of nodes to have in a cluster to be nicely available? 2 or 3?

I think that two may be insufficient because if the nodes go out of communication with each other you run the risk of the split brain problem. The mitigation here is to have 3 nodes (with minimum master nodes set to 2).

I suppose an alternative is to have a small routing only node to help with master election and 2 storage nodes.

Is my understanding sound or am I missing something?

Many thanks,
Edward

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