41 lines
1.7 KiB
Plaintext
41 lines
1.7 KiB
Plaintext
[float]
|
|
[[breaking_70_discovery_changes]]
|
|
=== Discovery changes
|
|
|
|
[float]
|
|
==== Cluster bootstrapping is required if discovery is configured
|
|
|
|
The first time a cluster is started, `cluster.initial_master_nodes` must be set
|
|
to perform cluster bootstrapping. It should contain the names of the
|
|
master-eligible nodes in the initial cluster and be defined on every
|
|
master-eligible node in the cluster. See <<discovery-settings,the discovery
|
|
settings summary>> for an example, and the
|
|
<<modules-discovery-bootstrap-cluster,cluster bootstrapping reference
|
|
documentation>> describes this setting in more detail.
|
|
|
|
The `discovery.zen.minimum_master_nodes` setting is required during a rolling
|
|
upgrade from 6.x, but can be removed in all other circumstances.
|
|
|
|
[float]
|
|
==== Removing master-eligible nodes sometimes requires voting exclusions
|
|
|
|
If you wish to remove half or more of the master-eligible nodes from a cluster,
|
|
you must first exclude the affected nodes from the voting configuration using
|
|
the <<modules-discovery-adding-removing-nodes,voting config exclusions API>>.
|
|
If you remove fewer than half of the master-eligible nodes at the same time,
|
|
voting exclusions are not required. If you remove only master-ineligible nodes
|
|
such as data-only nodes or coordinating-only nodes, voting exclusions are not
|
|
required. Likewise, if you add nodes to the cluster, voting exclusions are not
|
|
required.
|
|
|
|
[float]
|
|
==== Discovery configuration is required in production
|
|
|
|
Production deployments of Elasticsearch now require at least one of the
|
|
following settings to be specified in the `elasticsearch.yml` configuration
|
|
file:
|
|
|
|
- `discovery.zen.ping.unicast.hosts`
|
|
- `discovery.zen.hosts_provider`
|
|
- `cluster.initial_master_nodes`
|