Create or update desired nodes API

edit

Create or update desired nodes API

edit

This feature is designed for indirect use by Elasticsearch Service, Elastic Cloud Enterprise, and Elastic Cloud on Kubernetes. Direct use is not supported.

Creates or updates the desired nodes.

Request

edit
PUT /_internal/desired_nodes/<history_id>/<version>
{
    "nodes" : [
        {
            "settings" : {
                 "node.name" : "instance-000187",
                 "node.external_id": "instance-000187",
                 "node.roles" : ["data_hot", "master"],
                 "node.attr.data" : "hot",
                 "node.attr.logical_availability_zone" : "zone-0"
            },
            "processors" : 8.0,
            "memory" : "58gb",
            "storage" : "2tb",
            "node_version" : "{version}"
        }
    ]
}

Query parameters

edit
master_timeout
(Optional, time units) Period to wait for a connection to the master node. If no response is received before the timeout expires, the request fails and returns an error. Defaults to 30s.

Description

edit

This API creates or update the desired nodes. External orchestrators can use this API to let Elasticsearch know about the cluster topology, including future changes such as adding or removing nodes. Using this information, the system is able to take better decisions.

Examples

edit

In this example, a new version for the desired nodes with history Ywkh3INLQcuPT49f6kcppA is created. This API only accepts monotonically increasing versions.

PUT /_internal/desired_nodes/Ywkh3INLQcuPT49f6kcppA/100
{
    "nodes" : [
        {
            "settings" : {
                 "node.name" : "instance-000187",
                 "node.external_id": "instance-000187",
                 "node.roles" : ["data_hot", "master"],
                 "node.attr.data" : "hot",
                 "node.attr.logical_availability_zone" : "zone-0"
            },
            "processors" : 8.0,
            "memory" : "58gb",
            "storage" : "2tb",
            "node_version" : "{version}"
        }
    ]
}

The API returns the following result:

{
  "replaced_existing_history_id": false
}

Additionally, it is possible to specify a processors range. This is helpful in environments where Elasticsearch nodes can be deployed in hosts where the number of processors that the Elasticsearch process can use is guaranteed to be at least the lower range and up to the upper range. This is a common scenario in Linux deployments where cgroups is used.

PUT /_internal/desired_nodes/Ywkh3INLQcuPT49f6kcppA/101
{
    "nodes" : [
        {
            "settings" : {
                 "node.name" : "instance-000187",
                 "node.external_id": "instance-000187",
                 "node.roles" : ["data_hot", "master"],
                 "node.attr.data" : "hot",
                 "node.attr.logical_availability_zone" : "zone-0"
            },
            "processors_range" : {"min": 8.0, "max": 10.0},
            "memory" : "58gb",
            "storage" : "2tb",
            "node_version" : "{version}"
        }
    ]
}