Resizing a Cluster

Function

This API is used to 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	Explanation Project ID. For details about how to obtain the project ID, see Obtaining a Project ID. Constraints N/A Value range The value must consist of 1 to 64 characters. Only letters and digits are allowed. Default value N/A
cluster_id	Yes	String	Explanation Cluster ID If this parameter is specified, the latest metadata of the cluster that has been patched will be obtained. For details about how to obtain the cluster ID, see Obtaining a Cluster ID. Constraints N/A Value range The value can contain 1 to 64 characters, including only letters, digits, underscores (_), and hyphens (-). Default value N/A

Request Parameters

**Table 2** Request parameters
Parameter	Mandatory	Type	Description
service_id	No	String	Explanation Service ID. This parameter is reserved for extension. You do not need to set this parameter. Constraints N/A Value range N/A Default value N/A
plan_id	No	String	Explanation Plan ID. This parameter is reserved for extension. You do not need to set this parameter. Constraints N/A Value range N/A Default value N/A
parameters	Yes	ClusterScalingParams object	Explanation Request parameters. For details, see Table 3. Constraints N/A
previous_values	No	Map<String,String>	Explanation This parameter is an extended API and needs to be reserved. You do not need to set this parameter. Constraints N/A

**Table 3** ClusterScalingParams
Parameter	Mandatory	Type	Description
order_id	No	String	Explanation Order ID obtained by the system during scale-out or scale-in. You do not need to set the parameter. Constraints N/A Value range N/A Default value N/A
scale_type	Yes	String	Explanation Operation type on the cluster node. Constraints N/A Value range scale_in: cluster scale-in scale_out: cluster scale-out Default value N/A
node_id	Yes	String	Explanation ID of the newly added or removed node. The parameter value is fixed to node_orderadd. Constraints N/A Value range N/A Default value N/A
node_group	No	String	Explanation Node group to be scaled out or in Constraints N/A Value range core_node_default_group: indicates the Core node group. task_node_default_group: indicates the Task node group. Default value core_node_default_group
task_node_info	No	Object	Explanation Task node specifications. For more parameter description, see Table 4. Constraints 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. If this parameter is left blank, its mandatory field becomes unavailable and will pass an empty button for the null object.
instances	Yes	Integer	Explanation Number of nodes to be added or removed Constraints 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. Value range ≥1 Default value N/A
skip_bootstrap_scripts	No	String	Explanation Whether to skip the bootstrap action. 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. Constraints N/A Value range true: Skip the bootstrap action. false: Execute the bootstrap action. Default value false
scale_without_start	No	Boolean	Explanation Whether to start components on the added nodes after cluster scale-out Constraints N/A Value range true: Do not start components after scale-out. false: Start components after scale-out. Default value N/A
server_ids	No	Array of strings	Explanation ID list of Task nodes to be deleted during task node scale-in. Constraints 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	Explanation Instance specifications of a Task node, for example, c3.4xlarge.2.linux.bigdata. You are advised to obtain the specifications supported by the corresponding version in the corresponding region from the cluster creation page on the MRS console. Constraints N/A Value range N/A Default value N/A
data_volume_type	Yes	String	Explanation Data disk storage type of the Task node. Supported types include SATA, SAS, and SSD. Constraints N/A Value range SATA: common I/O SAS: high I/O SSD: ultra-high I/O GPSSD: general-purpose SSD Default value N/A
data_volume_count	Yes	Integer	Explanation Number of data disks of a Task node. Constraints N/A Value range 0-20 Default value N/A
data_volume_size	Yes	Integer	Explanation Data disk storage space of a Task node. You only need to pass in a number without the unit GB. Constraints N/A Value range 100-32000 Default value N/A

Response Parameters

Table 5 describes the response parameter.

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

Example Request

Add one core node to the MRS cluster.

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": { }
}

If the number of Task nodes is greater than 0, add one Task node to the MRS cluster.

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": { }
}

If the number of Task nodes is greater than 0, add a Task node of the c3.2xlarge.2.linux.bigdata specification to the MRS cluster.

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": "c3.2xlarge.2.linux.bigdata",
                  "data_volume_type":"SATA",
                  "data_volume_count":2,
                  "data_volume_size":600
                  },
        "instances": "1",  
        "scale_without_start":false


    },  
    "previous_values": { }
}

Remove a core node from the MRS cluster.

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": { }
}

Remove a Task node from the MRS cluster.

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": { }
}

Remove a specified Task node from the MRS cluster.

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": { }
}