diff --git a/docs/reference/modules/node.asciidoc b/docs/reference/modules/node.asciidoc index 7b891c579beaa..1e2f7a6e3dd97 100644 --- a/docs/reference/modules/node.asciidoc +++ b/docs/reference/modules/node.asciidoc @@ -156,6 +156,13 @@ discovery.zen.minimum_master_nodes: 2 <1> ---------------------------- <1> Defaults to `1`. +To be able to remain available when one of the master-eligible nodes fails, +clusters should have at least three master-eligible nodes, with +`minimum_master_nodes` set accordingly. A <>, +performed without any downtime, also requires at least three master-eligible +nodes to avoid the possibility of data loss if a network split occurs while the +upgrade is in progress. + This setting can also be changed dynamically on a live cluster with the <>: