Should I give my machines more ram or put a new machine into the cluster?

Elastic Stack Elasticsearch
1

Hi,

I have a cluster with four data nodes. Those nodes have 6 cpus and 16gb of ram.
I have 15098 active shards in this cluster.

Should I put more ram in my machines or set up a new host for this cluster?

The problem is that sometimes elasticsearch kills itself because the heap space is running out.

2

You probably have too many shards per node.

May I suggest you look at the following resources about sizing:

https://www.elastic.co/elasticon/conf/2016/sf/quantitative-cluster-sizing

And https://www.elastic.co/webinars/using-rally-to-get-your-elasticsearch-cluster-size-right

3

If you are suffering from heap pressure, I would recommend having a look at this webinar in addition to the resources David linked to.

4

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