Help Center/ FunctionGraph/ API Reference/ APIs/ Reserved Instances/ Changing the Number of Reserved Instances
Updated on 2026-10-27 GMT+08:00

Changing the Number of Reserved Instances

Function

This API is used to change the number of reserved instances.

Calling Method

For details, see Calling APIs.

Authorization Information

Each account has all the permissions required to call all APIs, but IAM users must be assigned the required permissions. For details about the required permissions, see Permissions Policies and Supported Actions.

URI

PUT /v2/{project_id}/fgs/functions/{function_urn}/reservedinstances

Table 1 Path Parameters

Parameter

Mandatory

Type

Description

project_id

Yes

String

Parameter description:

Project ID. For details, see Obtaining a Project ID.

Constraints:

None

Value range:

32 characters, including letters and digits.

Default value:

None

function_urn

Yes

String

Parameter description:

URN of the function. For details, see Function Model.

Constraints:

None

Value range:

Only letters, digits, underscores (_), hyphens (-), and colons (:) are allowed.

Default value:

None

Request Parameters

Table 2 Request header parameters

Parameter

Mandatory

Type

Description

X-Auth-Token

Yes

String

Parameter description:

User token.

The token can be obtained by calling the IAM API. The value of X-Subject-Token in the response header is the user token.

Constraints:

None

Value range:

None

Default value:

None

Content-Type

Yes

String

Parameter description:

Specifies the type (or format) of the message body.

Constraints:

None

Value range:

Only application/json is supported.

Default value:

application/json

Table 3 Request body parameters

Parameter

Mandatory

Type

Description

count

Yes

Integer

Parameter description:

Reserved Instances

Constraints

None

Range:

None

Default Value

None

idle_mode

No

Boolean

Parameter description:

Whether to enable the idle mode.

Constraints

None

Range:

None

Default Value

None

tactics_config

No

TacticsConfig object

Parameter description:

Reserved Instance Policies

Constraints

None

Range:

None

Default Value

None

Table 4 TacticsConfig

Parameter

Mandatory

Type

Description

cron_configs

No

Array of CronConfig objects

Parameter description:

Scheduled configuration list.

Constraints

None

Range:

None

Default Value

None

metric_configs

No

Array of MetricConfig objects

Parameter description:

Flow control configuration list.

Constraints

None

Range:

None

Default Value

None

Table 5 CronConfig

Parameter

Mandatory

Type

Description

name

No

String

Parameter description:

Scheduled configuration name.

Constraints

None

Range:

None

Default Value

None

cron

No

String

Parameter description:

Cron expression.

Constraints

None

Range:

None

Default Value

None

count

No

Integer

Parameter description:

Number of started reserved instances.

Constraints

None

Range:

None

Default Value

None

start_time

No

Long

Parameter description:

Start timestamp.

Constraints

Epoch timestamp

Range:

None

Default Value

None

expired_time

No

Long

Parameter description:

Expiry time.

Constraints

Epoch timestamp

Range:

None

Default Value

None

Table 6 MetricConfig

Parameter

Mandatory

Type

Description

name

No

String

Parameter description:

Flow control configuration name.

Constraints

None

Range:

None

Default Value

None

type

No

String

Parameter description:

Flow control type.

Constraints

None

Range

Currently, only the reserved instance usage is supported.

Concurrency: reserved instance usage

Default Value

None

threshold

No

Integer

Parameter description:

Traffic threshold

Constraints

None

Range

[0, 100]

Default Value

None

min

No

Integer

Parameter description:

Minimum value.

Constraints

None

Range:

None

Default Value

None

Response Parameters

Status code: 200

Table 7 Response body parameters

Parameter

Type

Description

count

Integer

Parameter description:

Reserved Instances

Range:

None

idle_mode

Boolean

Parameter description:

Whether to enable the idle mode.

Range:

None

tactics_config

TacticsConfig object

Parameter description:

Reserved Instance Policies

Range:

None

Table 8 TacticsConfig

Parameter

Type

Description

cron_configs

Array of CronConfig objects

Parameter description:

Scheduled configuration list.

Range:

None

metric_configs

Array of MetricConfig objects

Parameter description:

Flow control configuration list.

Range:

None

Table 9 CronConfig

Parameter

Type

Description

name

String

Parameter description:

Scheduled configuration name.

Range:

None

cron

String

Parameter description:

Cron expression.

Range:

None

count

Integer

Parameter description:

Number of started reserved instances.

Range:

None

start_time

Long

Parameter description:

Start timestamp.

Range:

None

expired_time

Long

Parameter description:

Expiry time.

Range:

None

Table 10 MetricConfig

Parameter

Type

Description

name

String

Parameter description:

Flow control configuration name.

Range:

None

type

String

Parameter description:

Flow control type.

Range

Currently, only the reserved instance usage is supported.

Concurrency: reserved instance usage

threshold

Integer

Parameter description:

Traffic threshold

Range

[0, 100]

min

Integer

Parameter description:

Minimum value.

Range:

None

Status code: 400

Table 11 Response body parameters

Parameter

Type

Description

error_code

String

Error code.

error_msg

String

Error message.

Status code: 401

Table 12 Response body parameters

Parameter

Type

Description

error_code

String

Error code.

error_msg

String

Error message.

Status code: 403

Table 13 Response body parameters

Parameter

Type

Description

error_code

String

Error code.

error_msg

String

Error message.

Status code: 404

Table 14 Response body parameters

Parameter

Type

Description

error_code

String

Error code.

error_msg

String

Error message.

Status code: 500

Table 15 Response body parameters

Parameter

Type

Description

error_code

String

Error code.

error_msg

String

Error message.

Example Requests

Update the number of a function's reserved instances to 3.

PUT https://{Endpoint}/v2/{project_id}/fgs/functions/{function_urn}/reservedinstances

{
  "count" : 3
}

Example Responses

Status code: 200

{
  "count" : 2
}

SDK Sample Code

The SDK sample code is as follows.

Java

Update the number of a function's reserved instances to 3.

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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.functiongraph.v2.region.FunctionGraphRegion;
import com.huaweicloud.sdk.functiongraph.v2.*;
import com.huaweicloud.sdk.functiongraph.v2.model.*;


public class UpdateFunctionReservedInstancesCountSolution {

    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);

        FunctionGraphClient client = FunctionGraphClient.newBuilder()
                .withCredential(auth)
                .withRegion(FunctionGraphRegion.valueOf("<YOUR REGION>"))
                .build();
        UpdateFunctionReservedInstancesCountRequest request = new UpdateFunctionReservedInstancesCountRequest();
        request.withFunctionUrn("{function_urn}");
        UpdateFunctionReservedInstancesCountRequestBody body = new UpdateFunctionReservedInstancesCountRequestBody();
        body.withCount(3);
        request.withBody(body);
        try {
            UpdateFunctionReservedInstancesCountResponse response = client.updateFunctionReservedInstancesCount(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());
        }
    }
}

Python

Update the number of a function's reserved instances to 3.

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# coding: utf-8

import os
from huaweicloudsdkcore.auth.credentials import BasicCredentials
from huaweicloudsdkfunctiongraph.v2.region.functiongraph_region import FunctionGraphRegion
from huaweicloudsdkcore.exceptions import exceptions
from huaweicloudsdkfunctiongraph.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 = FunctionGraphClient.new_builder() \
        .with_credentials(credentials) \
        .with_region(FunctionGraphRegion.value_of("<YOUR REGION>")) \
        .build()

    try:
        request = UpdateFunctionReservedInstancesCountRequest()
        request.function_urn = "{function_urn}"
        request.body = UpdateFunctionReservedInstancesCountRequestBody(
            count=3
        )
        response = client.update_function_reserved_instances_count(request)
        print(response)
    except exceptions.ClientRequestException as e:
        print(e.status_code)
        print(e.request_id)
        print(e.error_code)
        print(e.error_msg)

Go

Update the number of a function's reserved instances to 3.

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package main

import (
	"fmt"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic"
    functiongraph "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/functiongraph/v2"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/services/functiongraph/v2/model"
    region "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/functiongraph/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 := functiongraph.FunctionGraphClientBuilder().
         WithRegion(region.ValueOf("<YOUR REGION>")).
         WithCredential(auth).
         SafeBuild()


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

    client := functiongraph.NewFunctionGraphClient(hcClient)

    request := &model.UpdateFunctionReservedInstancesCountRequest{}
	request.FunctionUrn = "{function_urn}"
	request.Body = &model.UpdateFunctionReservedInstancesCountRequestBody{
		Count: int32(3),
	}
	response, err := client.UpdateFunctionReservedInstancesCount(request)
	if err == nil {
        fmt.Printf("%+v\n", response)
    } else {
        fmt.Println(err)
    }
}

More

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

Status Code

Description

200

OK

400

Bad request.

401

Unauthorized.

403

Forbidden.

404

Not found.

500

Internal server error.

Error Codes

See Error Codes.