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How to avoid rebalance during ES cluster starts up

I am using ES 7.10.1. My cluster has 20 nodes.

I would start these 20 nodes one by one (the cluster already has data). During the startup, would rebalance happen because some have started up while some haven't?

I would if rebalance may happen, how could I avoid this? Thanks.

Solution

  • In order to prevent rebalancing, you may run the following command, which is typically what is run before doing a rolling upgrade in order to prevent shards from being rebalanced to other nodes.

    PUT _cluster/settings
{
  "persistent": {
    "cluster.routing.allocation.enable": "none"
  }
}