Resizing a Cluster

Function

This API is used to manually scale out or scale in Core or Task nodes in a cluster that has been created. After an MRS cluster is created, the number of Master nodes cannot be adjusted. That is, Master nodes cannot be scaled in or out. This API is incompatible with Sahara.

Only clusters in the Running state can be scaled out or in.

The APIs described in this section support only streaming, analysis, and hybrid clusters.

URI

Format
PUT /v1.1/{project_id}/cluster_infos/{cluster_id}

Parameter description

**Table 1** URI parameters
Parameter	Mandatory	Type	Description
project_id	Yes	String	Project ID. For details about how to obtain the project ID, see Obtaining a Project ID.
cluster_id	Yes	String	Cluster ID For details about how to obtain the cluster ID, see Obtaining the MRS Cluster Information.

Request Parameters

**Table 2** Request parameters
Parameter	Mandatory	Type	Description
service_id	No	String	Service ID. This parameter is reserved for extension. You do not need to set this parameter.
plan_id	No	String	Plan ID. This parameter is reserved for extension. You do not need to set this parameter.
parameters	Yes	Object	Core parameters. For details, see Table 3.
previous_values	No	Map<String,String>	This parameter is an extended API and needs to be reserved. You do not need to set this parameter.

**Table 3** parameters description
Parameter	Mandatory	Type	Description
order_id	No	String	Order ID obtained by the system during scale-out or scale-in. You do not need to set the parameter.
scale_type	Yes	String	scale_in: cluster scale-in scale_out: cluster scale-out
node_id	Yes	String	ID of the newly added or removed node. The parameter value is fixed to node_orderadd.
node_group	No	String	Node group to be scaled out or in If the value of node_group is core_node_default_group, the node group is a Core node group. If the value of node_group is task_node_default_group, the node group is a Task node group. If it is left blank, the default value core_node_default_group is used.
task_node_info	No	Object	Task node specifications. For more parameter description, see Table 4. When the number of Task nodes is 0, this parameter is used to specify Task node specifications. When the number of Task nodes is greater than 0, this parameter is unavailable.
instances	Yes	Integer	Number of nodes to be added or removed The maximum number of nodes to be added is 500 minus the number of Core and Task nodes. For example, the current number of Core nodes is 3, the number of nodes to be added must be less than or equal to 497. A maximum of 500 Core and Task nodes are supported by default. If more than 500 Core and Task nodes are required, contact technical support engineers or call a background API to modify the database. Nodes can be deleted for cluster scale-out when the number of Core nodes is greater than 3 or the number of Task nodes is greater than 0. For example, if there are 5 Core nodes and 5 Task nodes in a cluster, only 2 (5 minus 3) Core nodes are available for deletion and 5 or fewer than 5 Task nodes can be deleted.
skip_bootstrap_scripts	No	String	This parameter is valid only when a bootstrap action is configured during cluster creation and takes effect during scale-out. It indicates whether the bootstrap action specified during cluster creation is performed on nodes added during scale-out. The default value is false, indicating that the bootstrap action is performed.
scale_without_start	No	Boolean	Whether to start components on the added nodes after cluster scale-out true: Do not start components after scale-out. false: Start components after scale-out.
server_ids	No	Array of strings	ID list of Task nodes to be deleted during task node scale-in. This parameter does not take effect when scale_type is set to scale-out. If scale_type is set to scale-in and cannot be left blank, the system deletes the specified Task nodes. When scale_type is set to scale-in and server_ids is left blank, the system automatically deletes the Task nodes based on the system rules.

**Table 4** task_node_info parameters
Parameter	Mandatory	Type	Description
node_size	Yes	String	Instance specifications of a Task node, Example:
data_volume_type	Yes	String	Data disk storage type of the Task node, supporting SATA, SAS, and SSD currently. SATA: common I/O SAS: high I/O SSD: ultra-high I/O GPSSD: general-purpose SSD
data_volume_count	Yes	Integer	Number of data disks of a Task node Value range: 0 to 10
data_volume_size	Yes	Integer	Data disk storage space of a Task node Value range: 100 GB to 32,000 GB. When assigning a value to this parameter, you only need to pass a number, without the unit.

Response Parameters

Response parameters

Table 5 describes the response parameter.

**Table 5** Response parameter
Parameter	Type	Description
result	String	Operation result succeeded: The operation is successful. Error Codes describes the error codes returned upon operation failures.

Example

Example request

Example of adding core nodes

PUT /v1.1/{project_id}/cluster_infos/{cluster_id}

{ 
    "service_id": "",  
    "plan_id": "",  
    "parameters": { 
        "order_id": "",  
        "scale_type": "scale_out",  
        "node_id": "node_orderadd",  
        "node_group": "core_node_default_group",
        "instances": "1",
       "skip_bootstrap_scripts":false,
       "scale_without_start":false
    },  
    "previous_values": { }
}

Example of adding task nodes when the number of existing task nodes is greater than zero

PUT /v1.1/{project_id}/cluster_infos/{cluster_id}

{ 
    "service_id": "",  
    "plan_id": "",  
    "parameters": { 
        "order_id": "",  
        "scale_type": "scale_out",  
        "node_id": "node_orderadd",  
        "node_group": "task_node_default_group",
        "instances": "1",
        "skip_bootstrap_scripts":false,  
        "scale_without_start":false
    },  
    "previous_values": { }
}

Example of adding task nodes when the number of existing task nodes is zero

PUT /v1.1/{project_id}/cluster_infos/{cluster_id}

{ 
    "service_id": "",  
    "plan_id": "",  
    "parameters": { 
        "order_id": "",  
        "scale_type": "scale_out",  
        "node_id": "node_orderadd",  
        "node_group": "task_node_default_group",
        "task_node_info": {
                  "node_size": "",
                  "data_volume_type":"SATA",
                  "data_volume_count":2,
                  "data_volume_size":600
                  },
        "instances": "1",  
        "scale_without_start":false


    },  
    "previous_values": { }
}

Example of adding core nodes

PUT /v1.1/{project_id}/cluster_infos/{cluster_id}

{ 
    "service_id": "",  
    "plan_id": "",  
    "parameters": { 
        "order_id": "",  
        "scale_type": "scale_in",  
        "node_id": "node_orderadd",  
        "node_group": "core_node_default_group",
        "instances": "1"  


    },  
    "previous_values": { }
}

Example of removing task nodes

PUT /v1.1/{project_id}/cluster_infos/{cluster_id}

{ 
    "service_id": "",  
    "plan_id": "",  
    "parameters": { 
        "order_id": "",  
        "scale_type": "scale_in",  
        "node_id": "node_orderadd",  
        "node_group": "task_node_default_group",
        "instances": "1"  

    },  
    "previous_values": { }
}

Example of removing specified task nodes

PUT /v1.1/{project_id}/cluster_infos/{cluster_id}

{ 
    "service_id": "",  
    "plan_id": "",  
    "parameters": { 
        "order_id": "",  
        "scale_type": "scale_in",  
        "node_id": "node_orderadd",  
        "node_group": "task_node_default_group",
        "instances": "2",
        "server_ids": ["c9573435-7814-4b2c-9131-ad78b814414c", "a4951009-6a0f-4e7b-9c81-9d4bd1f8c537"]  
    },  
    "previous_values": { }
}