41 lines
1.6 KiB
Plaintext
41 lines
1.6 KiB
Plaintext
[float]
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[[breaking_70_discovery_changes]]
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=== Discovery changes
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==== Cluster bootstrapping is required if discovery is configured
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The first time a cluster is started, `cluster.initial_master_nodes` must be set
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to perform cluster bootstrapping. It should contain the names of the
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master-eligible nodes in the initial cluster and be defined on every
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master-eligible node in the cluster. See <<discovery-settings,the discovery
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settings summary>> for an example, and the
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<<modules-discovery-bootstrap-cluster,cluster bootstrapping reference
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documentation>> describes this setting in more detail.
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The `discovery.zen.minimum_master_nodes` setting is permitted, but ignored, on
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7.x nodes.
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==== Removing master-eligible nodes sometimes requires voting exclusions
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If you wish to remove half or more of the master-eligible nodes from a cluster,
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you must first exclude the affected nodes from the voting configuration using
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the <<modules-discovery-adding-removing-nodes,voting config exclusions API>>.
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If you remove fewer than half of the master-eligible nodes at the same time,
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voting exclusions are not required. If you remove only master-ineligible nodes
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such as data-only nodes or coordinating-only nodes, voting exclusions are not
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required. Likewise, if you add nodes to the cluster, voting exclusions are not
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required.
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[float]
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==== Discovery configuration is required in production
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Production deployments of Elasticsearch now require at least one of the
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following settings to be specified in the `elasticsearch.yml` configuration
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file:
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- `discovery.zen.ping.unicast.hosts`
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- `discovery.zen.hosts_provider`
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- `cluster.initial_master_nodes`
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