Help Center/ MapReduce Service/ API Reference/ API V2/ Auto Scaling APIs/ Creating an Auto Scaling policy - CreateAutoScalingPolicy
Updated on 2026-09-15 GMT+08:00

Creating an Auto Scaling policy - CreateAutoScalingPolicy

Function

This API is used to create an autoscaling policy for a specified MRS cluster and configure the autoscaling rules for cluster nodes. It can be used together with the autoscaling policy viewing API to view the details of the created policy.

Constraints

None

Debugging

You can debug this API in API Explorer, which supports automatic authentication and authorization. API Explorer can automatically generate sample SDK code and supports sample SDK code debugging.

Authorization Information

Each account has all the permissions required to call all APIs, but IAM users must be assigned the required permissions.

  • If you are using role/policy-based authorization, see Permissions Policies and Supported Actions for details on the required permissions.
  • If you are using identity policy-based authorization, no identity policy-based permissions are required for calling this API.

URI

POST /v2/{project_id}/autoscaling-policy/{cluster_id}

Table 1 URI parameters

Parameter

Mandatory

Type

Description

project_id

Yes

String

Definition

Project ID. For details about how to obtain the project ID, see Obtaining a Project ID.

Constraints

N/A

Range

The value must consist of 1 to 64 characters. Only letters and digits are allowed.

Default Value

N/A

cluster_id

Yes

String

Definition

Cluster ID. For details about how to obtain the cluster ID, see Obtaining a Cluster ID.

Constraints

N/A

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 body parameters

Parameter

Mandatory

Type

Description

node_group_name

Yes

String

Definition

Node group name.

Constraints

N/A

Range

Only letters, digits, and underscores (_) are allowed. Custom node group names must contain 3 to 14 characters.

Default Value

N/A

resource_pool_name

Yes

String

Definition

Pool name.

Constraints

When the cluster version does not support autoscaling based on a resource pool, the value must be set to default.

Range

The value can contain 1 to 50 characters. Only letters, digits, underscores (_), and hyphens (-) are allowed.

Default Value

N/A

auto_scaling_policy

Yes

AutoScalingPolicyInfo object

Definition

Auto scaling rule. For details about the parameters, see Table 3.

Constraints

N/A

Range

N/A

Default Value

N/A

Table 3 AutoScalingPolicyInfo

Parameter

Mandatory

Type

Description

auto_scaling_enable

No

Boolean

Definition

Whether to enable the auto scaling rule.

Constraints

N/A

Range

  • true: Enable the auto scaling rule.
  • false: Disable the autoscaling rule.

Default Value

N/A

min_capacity

No

Integer

Definition

Minimum number of nodes left in the node group.

Constraints

N/A

Range

0~500

Default Value

N/A

max_capacity

No

Integer

Definition

Maximum number of nodes in the node group.

Constraints

max_capacity must be greater than or equal to min_capacity.

Range

0~500

Default Value

N/A

resources_plans

No

Array of ResourcesPlan objects

Definition

Resource plans. For details, see Table 4.

If this parameter is left blank, the resource plan is disabled.

Constraints

When auto_scaling_enable is set to true, either this parameter or rules must be configured. A maximum of five records are allowed.

Range

N/A

Default Value

N/A

rules

No

Array of Rule objects

Definition

Auto scaling rules. For details, see Table 5.

Constraints

When auto_scaling_enable is set to true, either this parameter or rules must be configured. The number of records cannot exceed 10.

Range

N/A

Default Value

N/A

tags

No

Array of Tag objects

Definition

Tags of an auto scaling rule. For details about the parameters, see Table 7.

Constraints

A maximum of 20 tags are allowed.

Range

N/A

Default Value

N/A

Table 4 ResourcesPlan

Parameter

Mandatory

Type

Description

period_type

Yes

String

Definition

Cycle type of a resource plan. This parameter can be set to daily only.

Constraints

N/A

Range

daily: Charges are calculated by day.

Default Value

N/A

start_time

Yes

String

Definition

Start time of a resource plan. The value is in the format of hour:minute, indicating that the time ranges from 00:00 to 23:59.

Constraints

N/A

Range

00:00–23:59

Default Value

N/A

end_time

Yes

String

Definition

End time of a resource plan. The format is the same as that of start_time.

Constraints

The value cannot be earlier than the start_time, and the interval between start_time and start_time cannot be less than 30 minutes.

Range

00:00–23:59

Default Value

N/A

min_capacity

Yes

Integer

Definition

Minimum number of the preserved nodes in a node group in a resource plan.

Constraints

N/A

Range

0~500

Default Value

N/A

max_capacity

Yes

Integer

Definition

Maximum number of the preserved nodes in a node group in a resource plan.

Constraints

max_capacity must be greater than or equal to min_capacity.

Range

0~500

Default Value

N/A

effective_days

No

Array of strings

Definition

The effective date of a resource plan. If this parameter is left blank, it indicates that the resource plan takes effect every day. The options are as follows:

MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, and SUNDAY

Constraints

N/A

Range

N/A

Default Value

N/A

Table 5 Rule

Parameter

Mandatory

Type

Description

name

Yes

String

Definition

Name of an auto scaling rule.

Constraints

Rule names must be unique within a node group.

Range

The value can contain 1 to 64 characters, including only letters, digits, underscores (_), and hyphens (-).

Default Value

N/A

description

No

String

Definition

Description about an auto scaling rule.

Constraints

N/A

Range

The value can contain 0 to 1,024 characters. Only letters, digits, underscores (_), and hyphens (-) are allowed.

Default Value

N/A

adjustment_type

Yes

String

Definition

Adjustment type of an auto scaling rule.

Constraints

N/A

Range

  • scale_out: cluster scale-out
  • scale_in: cluster scale-in

Default Value

N/A

cool_down_minutes

Yes

Integer

Definition

Cluster cooling time after an auto scaling rule is triggered, when no auto scaling operation is performed. The unit is minute.

Constraints

N/A

Range

5 to 10080. 10080 indicates the number of minutes in a week.

Default Value

N/A

scaling_adjustment

Yes

Integer

Definition

Number of nodes that can be adjusted once.

Constraints

N/A

Range

1-100

Default Value

N/A

trigger

Yes

Trigger object

Definition

Condition for triggering a rule. For details, see Table 6.

Constraints

N/A

Range

N/A

Default Value

N/A

Table 6 Trigger

Parameter

Mandatory

Type

Description

metric_name

Yes

String

Definition

Metric name. This triggering condition makes a judgment according to the value of the metric. For details about the metric names, see Autoscaling Metrics.

Constraints

N/A

Range

For details about the value range, see Auto scaling metrics.

Default Value

N/A

metric_value

Yes

String

Definition

Metric threshold to trigger a rule. The value must be an integer or a number with two decimal places.

Constraints

N/A

Range

Only integers or numbers with two decimal places are allowed.

Default Value

N/A

comparison_operator

No

String

Definition

Metric judgment logic operator.

Constraints

N/A

Range

  • LT: less than
  • GT: greater than
  • LTOE: less than or equal to
  • GTOE: greater than or equal to

Default Value

N/A

evaluation_periods

Yes

Integer

Definition

Number of consecutive five-minute periods, during which a metric threshold is reached.

Constraints

N/A

Range

1-288

Default Value

N/A

Table 7 Tag

Parameter

Mandatory

Type

Description

key

Yes

String

Definition

Tag key.

Constraints

The tag key of a resource must be unique.

Range

  • A tag key can contain letters, digits, spaces, and special characters _.:=+-@, but cannot start or end with a space or start with _sys_.
  • It can contain a maximum of 128 Unicode characters and cannot be an empty string.

Default Value

N/A

value

Yes

String

Definition

Tag value.

Constraints

N/A

Range

  • The value can contain letters, digits, spaces, and special characters _.:=+-@, but cannot start or end with a space or start with _sys_.
  • The value can contain a maximum of 255 Unicode characters and can be an empty string.

Default Value

N/A

Response Parameters

Status code: 202

Autoscaling policy created.

None

Example Request

Create an auto scaling policy, set the number of node groups in node_group_1 to 0 to 5, and configure two scaling rules. If the value of YARNAppRunning is greater than or equal to 75 for one 5-minute period, add one Task node. If the value of YARNAppRunning is less than or equal to 25 for one 5-minute period, stop one Task node. The cooling duration is 20 minutes, and the aaa=bbb label is added to the involved nodes.

/v2/{project_id}/autoscaling-policy/{cluster_id}

{
  "node_group_name" : "node_group_1",
  "auto_scaling_policy" : {
    "auto_scaling_enable" : true,
    "min_capacity" : 0,
    "max_capacity" : 5,
    "rules" : [ {
      "name" : "default-expand-1",
      "adjustment_type" : "scale_out",
      "cool_down_minutes" : 20,
      "scaling_adjustment" : 1,
      "trigger" : {
        "metric_name" : "YARNAppRunning",
        "metric_value" : "75",
        "comparison_operator" : "GT",
        "evaluation_periods" : 1
      }
    }, {
      "name" : "default-shrink-1",
      "adjustment_type" : "scale_in",
      "cool_down_minutes" : 20,
      "scaling_adjustment" : 1,
      "trigger" : {
        "metric_name" : "YARNAppRunning",
        "metric_value" : "25",
        "comparison_operator" : "LT",
        "evaluation_periods" : 1
      }
    } ],
    "resources_plans" : [ {
      "period_type" : "daily",
      "start_time" : "06:00",
      "end_time" : "20:00",
      "min_capacity" : "0",
      "max_capacity" : "2",
      "effective_days" : [ "MONDAY" ]
    } ],
    "tags" : [ {
      "key" : "aaa",
      "value" : "bbb"
    } ]
  },
  "resource_pool_name" : "default"
}

Example Response

None

SDK Sample Code

The SDK sample code is as follows.

Create an autoscaling policy. Configure the node group node_group_1 with a node count range of 0–5, and configure two scaling rules. If YARNAppRunning is greater than or equal to 75 for one consecutive five-minute period, add one Task node. If YARNAppRunning is less than or equal to 25 for one consecutive five-minute period, terminate one Task node. The cooldown period for both rules is 20 minutes. Nodes launched under this policy are tagged with aaa=bbb.

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package com.huaweicloud.sdk.test;

import com.huaweicloud.sdk.core.auth.ICredential;
import com.huaweicloud.sdk.core.auth.BasicCredentials;
import com.huaweicloud.sdk.core.exception.ConnectionException;
import com.huaweicloud.sdk.core.exception.RequestTimeoutException;
import com.huaweicloud.sdk.core.exception.ServiceResponseException;
import com.huaweicloud.sdk.mrs.v2.region.MrsRegion;
import com.huaweicloud.sdk.mrs.v2.*;
import com.huaweicloud.sdk.mrs.v2.model.*;

import java.util.List;
import java.util.ArrayList;

public class CreateAutoScalingPolicySolution {

    public static void main(String[] args) {
        // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
        // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
        String ak = System.getenv("CLOUD_SDK_AK");
        String sk = System.getenv("CLOUD_SDK_SK");
        String projectId = "{project_id}";

        ICredential auth = new BasicCredentials()
                .withProjectId(projectId)
                .withAk(ak)
                .withSk(sk);

        MrsClient client = MrsClient.newBuilder()
                .withCredential(auth)
                .withRegion(MrsRegion.valueOf("<YOUR REGION>"))
                .build();
        CreateAutoScalingPolicyRequest request = new CreateAutoScalingPolicyRequest();
        request.withClusterId("{cluster_id}");
        AutoScalingPolicyV2 body = new AutoScalingPolicyV2();
        List<Tag> listAutoScalingPolicyTags = new ArrayList<>();
        listAutoScalingPolicyTags.add(
            new Tag()
                .withKey("aaa")
                .withValue("bbb")
        );
        Trigger triggerRules = new Trigger();
        triggerRules.withMetricName("YARNAppRunning")
            .withMetricValue("25")
            .withComparisonOperator("LT")
            .withEvaluationPeriods(1);
        Trigger triggerRules1 = new Trigger();
        triggerRules1.withMetricName("YARNAppRunning")
            .withMetricValue("75")
            .withComparisonOperator("GT")
            .withEvaluationPeriods(1);
        List<Rule> listAutoScalingPolicyRules = new ArrayList<>();
        listAutoScalingPolicyRules.add(
            new Rule()
                .withName("default-expand-1")
                .withAdjustmentType(Rule.AdjustmentTypeEnum.fromValue("scale_out"))
                .withCoolDownMinutes(20)
                .withScalingAdjustment(1)
                .withTrigger(triggerRules1)
        );
        listAutoScalingPolicyRules.add(
            new Rule()
                .withName("default-shrink-1")
                .withAdjustmentType(Rule.AdjustmentTypeEnum.fromValue("scale_in"))
                .withCoolDownMinutes(20)
                .withScalingAdjustment(1)
                .withTrigger(triggerRules)
        );
        List<ResourcesPlan.EffectiveDaysEnum> listResourcesPlansEffectiveDays = new ArrayList<>();
        listResourcesPlansEffectiveDays.add(ResourcesPlan.EffectiveDaysEnum.fromValue("MONDAY"));
        List<ResourcesPlan> listAutoScalingPolicyResourcesPlans = new ArrayList<>();
        listAutoScalingPolicyResourcesPlans.add(
            new ResourcesPlan()
                .withPeriodType("daily")
                .withStartTime("06:00")
                .withEndTime("20:00")
                .withMinCapacity(0)
                .withMaxCapacity(2)
                .withEffectiveDays(listResourcesPlansEffectiveDays)
        );
        AutoScalingPolicyInfo autoScalingPolicybody = new AutoScalingPolicyInfo();
        autoScalingPolicybody.withAutoScalingEnable(true)
            .withMinCapacity(0)
            .withMaxCapacity(5)
            .withResourcesPlans(listAutoScalingPolicyResourcesPlans)
            .withRules(listAutoScalingPolicyRules)
            .withTags(listAutoScalingPolicyTags);
        body.withAutoScalingPolicy(autoScalingPolicybody);
        body.withResourcePoolName("default");
        body.withNodeGroupName("node_group_1");
        request.withBody(body);
        try {
            CreateAutoScalingPolicyResponse response = client.createAutoScalingPolicy(request);
            System.out.println(response.toString());
        } catch (ConnectionException e) {
            e.printStackTrace();
        } catch (RequestTimeoutException e) {
            e.printStackTrace();
        } catch (ServiceResponseException e) {
            e.printStackTrace();
            System.out.println(e.getHttpStatusCode());
            System.out.println(e.getRequestId());
            System.out.println(e.getErrorCode());
            System.out.println(e.getErrorMsg());
        }
    }
}

Create an autoscaling policy. Configure the node group node_group_1 with a node count range of 0–5, and configure two scaling rules. If YARNAppRunning is greater than or equal to 75 for one consecutive five-minute period, add one Task node. If YARNAppRunning is less than or equal to 25 for one consecutive five-minute period, terminate one Task node. The cooldown period for both rules is 20 minutes. Nodes launched under this policy are tagged with aaa=bbb.

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# coding: utf-8

import os
from huaweicloudsdkcore.auth.credentials import BasicCredentials
from huaweicloudsdkmrs.v2.region.mrs_region import MrsRegion
from huaweicloudsdkcore.exceptions import exceptions
from huaweicloudsdkmrs.v2 import *

if __name__ == "__main__":
    # The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    # In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak = os.environ["CLOUD_SDK_AK"]
    sk = os.environ["CLOUD_SDK_SK"]
    projectId = "{project_id}"

    credentials = BasicCredentials(ak, sk, projectId)

    client = MrsClient.new_builder() \
        .with_credentials(credentials) \
        .with_region(MrsRegion.value_of("<YOUR REGION>")) \
        .build()

    try:
        request = CreateAutoScalingPolicyRequest()
        request.cluster_id = "{cluster_id}"
        listTagsAutoScalingPolicy = [
            Tag(
                key="aaa",
                value="bbb"
            )
        ]
        triggerRules = Trigger(
            metric_name="YARNAppRunning",
            metric_value="25",
            comparison_operator="LT",
            evaluation_periods=1
        )
        triggerRules1 = Trigger(
            metric_name="YARNAppRunning",
            metric_value="75",
            comparison_operator="GT",
            evaluation_periods=1
        )
        listRulesAutoScalingPolicy = [
            Rule(
                name="default-expand-1",
                adjustment_type="scale_out",
                cool_down_minutes=20,
                scaling_adjustment=1,
                trigger=triggerRules1
            ),
            Rule(
                name="default-shrink-1",
                adjustment_type="scale_in",
                cool_down_minutes=20,
                scaling_adjustment=1,
                trigger=triggerRules
            )
        ]
        listEffectiveDaysResourcesPlans = [
            "MONDAY"
        ]
        listResourcesPlansAutoScalingPolicy = [
            ResourcesPlan(
                period_type="daily",
                start_time="06:00",
                end_time="20:00",
                min_capacity=0,
                max_capacity=2,
                effective_days=listEffectiveDaysResourcesPlans
            )
        ]
        autoScalingPolicybody = AutoScalingPolicyInfo(
            auto_scaling_enable=True,
            min_capacity=0,
            max_capacity=5,
            resources_plans=listResourcesPlansAutoScalingPolicy,
            rules=listRulesAutoScalingPolicy,
            tags=listTagsAutoScalingPolicy
        )
        request.body = AutoScalingPolicyV2(
            auto_scaling_policy=autoScalingPolicybody,
            resource_pool_name="default",
            node_group_name="node_group_1"
        )
        response = client.create_auto_scaling_policy(request)
        print(response)
    except exceptions.ClientRequestException as e:
        print(e.status_code)
        print(e.request_id)
        print(e.error_code)
        print(e.error_msg)

Create an autoscaling policy. Configure the node group node_group_1 with a node count range of 0–5, and configure two scaling rules. If YARNAppRunning is greater than or equal to 75 for one consecutive five-minute period, add one Task node. If YARNAppRunning is less than or equal to 25 for one consecutive five-minute period, terminate one Task node. The cooldown period for both rules is 20 minutes. Nodes launched under this policy are tagged with aaa=bbb.

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package main

import (
 "fmt"
 "github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic"
    mrs "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/mrs/v2"
 "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/mrs/v2/model"
    region "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/mrs/v2/region"
)

func main() {
    // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak := os.Getenv("CLOUD_SDK_AK")
    sk := os.Getenv("CLOUD_SDK_SK")
    projectId := "{project_id}"

    auth, err := basic.NewCredentialsBuilder().
        WithAk(ak).
        WithSk(sk).
        WithProjectId(projectId).
        SafeBuild()

    if err != nil {
        fmt.Println(err)
        return
    }

    hcClient, err := mrs.MrsClientBuilder().
         WithRegion(region.ValueOf("<YOUR REGION>")).
         WithCredential(auth).
         SafeBuild()


    if err != nil {
        fmt.Println(err)
        return
    }

    client := mrs.NewMrsClient(hcClient)

    request := &model.CreateAutoScalingPolicyRequest{}
 request.ClusterId = "{cluster_id}"
 var listTagsAutoScalingPolicy = []model.Tag{
        {
            Key: "aaa",
            Value: "bbb",
        },
    }
 comparisonOperatorTrigger:= "LT"
 triggerRules := &model.Trigger{
  MetricName: "YARNAppRunning",
  MetricValue: "25",
  ComparisonOperator: &comparisonOperatorTrigger,
  EvaluationPeriods: int32(1),
 }
 comparisonOperatorTrigger1:= "GT"
 triggerRules1 := &model.Trigger{
  MetricName: "YARNAppRunning",
  MetricValue: "75",
  ComparisonOperator: &comparisonOperatorTrigger1,
  EvaluationPeriods: int32(1),
 }
 var listRulesAutoScalingPolicy = []model.Rule{
        {
            Name: "default-expand-1",
            AdjustmentType: model.GetRuleAdjustmentTypeEnum().SCALE_OUT,
            CoolDownMinutes: int32(20),
            ScalingAdjustment: int32(1),
            Trigger: triggerRules1,
        },
        {
            Name: "default-shrink-1",
            AdjustmentType: model.GetRuleAdjustmentTypeEnum().SCALE_IN,
            CoolDownMinutes: int32(20),
            ScalingAdjustment: int32(1),
            Trigger: triggerRules,
        },
    }
 var listEffectiveDaysResourcesPlans = []model.ResourcesPlanEffectiveDays{
        model.GetResourcesPlanEffectiveDaysEnum().MONDAY,
    }
 var listResourcesPlansAutoScalingPolicy = []model.ResourcesPlan{
        {
            PeriodType: "daily",
            StartTime: "06:00",
            EndTime: "20:00",
            MinCapacity: int32(0),
            MaxCapacity: int32(2),
            EffectiveDays: &listEffectiveDaysResourcesPlans,
        },
    }
 autoScalingEnableAutoScalingPolicy:= true
 minCapacityAutoScalingPolicy:= int32(0)
 maxCapacityAutoScalingPolicy:= int32(5)
 autoScalingPolicybody := &model.AutoScalingPolicyInfo{
  AutoScalingEnable: &autoScalingEnableAutoScalingPolicy,
  MinCapacity: &minCapacityAutoScalingPolicy,
  MaxCapacity: &maxCapacityAutoScalingPolicy,
  ResourcesPlans: &listResourcesPlansAutoScalingPolicy,
  Rules: &listRulesAutoScalingPolicy,
  Tags: &listTagsAutoScalingPolicy,
 }
 request.Body = &model.AutoScalingPolicyV2{
  AutoScalingPolicy: autoScalingPolicybody,
  ResourcePoolName: "default",
  NodeGroupName: "node_group_1",
 }
 response, err := client.CreateAutoScalingPolicy(request)
 if err == nil {
        fmt.Printf("%+v\n", response)
    } else {
        fmt.Println(err)
    }
}

For SDK sample code of more programming languages, see the Sample Code tab in API Explorer. SDK sample code can be automatically generated.

Status Codes

For details, see Status Codes.

Error Codes

See Error Codes.