Master node writes to only one data node use case

Elastic Stack Elasticsearch
1

Hi

I'm having three nodes one acts as master and two as data nodes. I need to ensure high availability. I want master to write data only to one node, say node A and other node will be only read-only node, node B. But if node A goes down, I prefer node B to be changed to write node and get the data, till node A comes up.
Ideally I need my data to be written to one node, which is active

Is it possible???

Regards
Ram

2

Elasticsearch does not work that way. If you want high availability you need to make all nodes master eligible as a minimum of 3 master eligible nodes is required. If you are on a version prior to 7.x you also need to set minimum_master_nodes to 2. Then make sure all indices have one replica configured and Elasticsearch will take care of the rest. You can read and write to any data node.

3

In that case, whether data will be spread across nodes?? means should I worry that fallen node data will not be visible in kibana??

5

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