Node config for split-brain avoidance

We are currently running an ES cluster with 5 nodes in this config, with minimum_master_node sets to 2 and having only 3 nodes be master-eligible

  • A: Master + Data
  • B: Master + Data
  • C: Master + Data
  • D: Data
  • E: Data

As we are running out of space, I would like to add another Data node and potentially more in the future. I want to make sure that it won’t become an issue with the Master-eligible nodes always set to 3 and just add Data nodes as required.

Your setup is fine, and adding additional data nodes (but not master-eligible nodes) will be fine.

Thanks — good to know!

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