Add new master to the ES cluster

Elastic Stack Elasticsearch
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1

Hi We are having ES cluster 7.10.0
with total 5 nodes
3 master node
3 data node
1 node serves as both data and master node
i have plan to add 1 more master only node

is any risk on adding new master only node to cluster , considering cluster is production cluster and number of master node become 4 which is not odd number

2

While noting this topic is being discussed in another thread too

what is your rationale to make a 4th master node?

In case of your 5-node cluster, it's certainly better to have a 6-node cluster with 3x masters and 3x data. But a 7-node cluster, 4x master and 3x data, would seem to me to add very little, if 2 masters are unavailable you will have problems.

1 Like
3

Thanks @RainTown I would like to modify cluster

  1. Add new master which make total master node to 4
  2. Modify the existing data +master node to data node , so that overall nodes will be 6 with 3 master and 3 slave

I want to know if i do step 1 does it impact current cluster stability ? because after step 1 i can go for step 2

4

That approach seems fine. To get to 3x master and 3x data, from where you are now, that is the best approach IMO.

But tbh this is exactly the topic of the parallel thread.

5

Yes @RainTown but still i want to be check if i add 4 th master in cluster , will it impact my current running cluster ? as its production cluster i want to be careful