Scaling In Nodes of a Specific Type

Function

This API is used to remove instances of specific types and reduce instance storage capacity in a cluster. Yearly/Monthly clusters do not support the removal of specified node types by calling this API.

All mission-critical data has been backed up before a cluster scale-in. This is to prevent data loss.

Debugging

You can debug this API through automatic authentication in API Explorer.

URI

POST /v1.0/extend/{project_id}/clusters/{cluster_id}/role/shrink

**Table 1** Path Parameters
Parameter	Mandatory	Type	Description
project_id	Yes	String	Parameter description: The project ID. For details about how to obtain the project ID and name, see Obtaining the Project ID and Name. Constraints: N/A Options: For details about how to obtain the project ID and name, see Obtaining the Project ID and Name. Default value: N/A
cluster_id	Yes	String	Parameter description: Specifies the ID of the cluster to be scaled in. For details, see Obtaining the Cluster ID. Constraints: N/A Options: For details about how to obtain the cluster ID, see Obtaining the Cluster ID. Default value: N/A

Request Parameters

**Table 2** Request body parameters
Parameter	Mandatory	Type	Description
shrink	Yes	Array of ShrinkNodeReq objects	Parameter description: Type and quantity of nodes you want to scale in.

**Table 3** ShrinkNodeReq
Parameter	Mandatory	Type	Description
reducedNodeNum	Yes	Integer	Parameter description: Number of nodes you want to reduce. After the scale-in, there has to be at least one node in each AZ under each node type. In a cross-AZ cluster, the difference between the numbers of same-type nodes in different AZs cannot exceed 1. For a cluster with no Master nodes, the number of removed data nodes (including cold data nodes and other types of nodes) in a scale-in must be fewer than half of the number of the original data nodes, and the number of remaining data nodes after a scale-in must be greater than the maximum number of index replicas. For a cluster with master nodes, the number of removed master nodes in a scale-in must be fewer than half of the number of the original master nodes. After scale-in, there has to be an odd number of master nodes, and there has to be at least three of them.
type	Yes	String	Parameter description: Node type. Options: ess: data node ess-cold: cold data node ess-client: client node ess-master: master node

Response Parameters

None

Example Requests

Scale in a cluster by scaling in specified type of nodes.

POST /v1.0/6204a5bd270343b5885144cf9c8c158d/clusters/4f3deec3-efa8-4598-bf91-560aad1377a3/role/shrink

{
  "shrink" : [ {
    "type" : "ess",
    "reducedNodeNum" : 1
  } ]
}

Example Responses

None

Status Codes

Status Code	Description
200	Request succeeded.
400	Invalid request. Modify the request before retry.
409	The request could not be completed due to a conflict with the current state of the resource. The resource that the client attempts to create already exists, or the update request fails to be processed because of a conflict.
412	The server did not meet one of the preconditions contained in the request.