Help Center/ Distributed Cache Service/ API Reference/ API V2/ Cache Analysis/ Creating a Hot Key Analysis Task
Updated on 2025-05-13 GMT+08:00
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Creating a Hot Key Analysis Task

Function

This API is used to create a hot key analysis task.

To perform hot key analysis, the instance's maxmemory-policy parameter must be set to allkeys-lfu or volatile-lfu.

Calling Method

For details, see Calling APIs.

URI

POST /v2/{project_id}/instances/{instance_id}/hotkey-task

Table 1 Path Parameters

Parameter

Mandatory

Type

Description

project_id

Yes

String

Parameter description:

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

Constraints:

N/A

Value range:

N/A

Default value:

N/A

instance_id

Yes

String

Parameter description:

Instance ID. It can be viewed on the instance details page on the DCS console.

Constraints:

N/A

Value range:

N/A

Default value:

N/A

Request Parameters

None

Response Parameters

Status code: 200

Table 2 Response body parameters

Parameter

Type

Description

id

String

Parameter description:

ID of the hot key analysis task.

Value range:

N/A

instance_id

String

Parameter description:

Instance ID.

Value range:

N/A

status

String

Parameter description:

Status of the hot key analysis task.

Value range:

  • waiting: The task is to be processed.

  • running: The task is being processed.

  • success: The task is successful.

  • failed: The task fails.

scan_type

String

Parameter description:

Analysis method.

Value range:

  • manual: manual analysis.

  • auto: automatic analysis.

created_at

String

Parameter description:

Time when an analysis task is created. The format is 2020-06-15T02:21:18.669Z.

Value range:

N/A

started_at

String

Parameter description:

Time when an analysis task started. The format is 2020-06-15T02:21:18.669Z. (The value is null and is not returned when the analysis task is being created.)

Value range:

N/A

finished_at

String

Parameter description:

Time when an analysis task ended. The format is 2020-06-15T02:21:18.669Z. (The value is null and is not returned when the analysis task is being created.)

Value range:

N/A

num

Integer

Parameter description:

Number of hot keys.

Value range:

N/A

keys

Array of HotkeysBody objects

Parameter description:

Hot key record. (The value is null and is not returned when the analysis task is being created.)

Value range:

N/A
Table 3 HotkeysBody

Parameter

Type

Description

name

String

Parameter description:

Key name.

Value range:

N/A

type

String

Parameter description:

Key type.

Value range:

  • string

  • list

  • set

  • zset

  • hash

shard

String

Parameter description:

Shard where the hot key is located. This parameter is supported only when the instance type is cluster. The format is ip:port.

Value range:

N/A

db

Integer

Parameter description:

Database where a hot key is located.

Value range:

0–255

size

Long

Parameter description:

Size of the key value.

Value range:

N/A

unit

String

Parameter description:

Key unit.

Value range:

  • count: number of keys.

  • byte: key size.

freq

Integer

Parameter description:

Reflects the access frequency of a key within a specific period of time.

The value is the logarithmic access frequency counter. The maximum value is 255, which indicates 1 million access requests. After the frequency reaches 255, the value will no longer increase even if access requests continue to increase. The value will decrease by 1 for every minute during which the key is not accessed.

Value range:

N/A

Status code: 400

Table 4 Response body parameters

Parameter

Type

Description

error_msg

String

Parameter description:

Error information.

Value range:

N/A

error_code

String

Parameter description:

Error code.

Value range:

For details, see Error Codes.

error_ext_msg

String

Parameter description:

Extended error information. This parameter is not used currently and is set to null.

Value range:

N/A

Status code: 401

Table 5 Response body parameters

Parameter

Type

Description

error_msg

String

Parameter description:

Error information.

Value range:

N/A

error_code

String

Parameter description:

Error code.

Value range:

For details, see Error Codes.

error_ext_msg

String

Parameter description:

Extended error information. This parameter is not used currently and is set to null.

Value range:

N/A

Status code: 403

Table 6 Response body parameters

Parameter

Type

Description

error_msg

String

Parameter description:

Error information.

Value range:

N/A

error_code

String

Parameter description:

Error code.

Value range:

For details, see Error Codes.

error_ext_msg

String

Parameter description:

Extended error information. This parameter is not used currently and is set to null.

Value range:

N/A

Status code: 404

Table 7 Response body parameters

Parameter

Type

Description

error_msg

String

Parameter description:

Error information.

Value range:

N/A

error_code

String

Parameter description:

Error code.

Value range:

For details, see Error Codes.

error_ext_msg

String

Parameter description:

Extended error information. This parameter is not used currently and is set to null.

Value range:

N/A

Status code: 500

Table 8 Response body parameters

Parameter

Type

Description

error_msg

String

Parameter description:

Error information.

Value range:

N/A

error_code

String

Parameter description:

Error code.

Value range:

For details, see Error Codes.

error_ext_msg

String

Parameter description:

Extended error information. This parameter is not used currently and is set to null.

Value range:

N/A

Example Requests

POST https://{dcs_endpoint}/v2/a4d31cb6-3d72-4fdc-8ec9-6e3a41e47f71/instances/5560df16-cebf-4473-95c4-d1b573c16e79/hotkey-task

Example Responses

Status code: 200

Hot key analysis task created successfully.

{
  "id" : "aa735b6f-3d70-44e3-9771-66c6fae7459a",
  "instance_id" : "5560df16-cebf-4473-95c4-d1b573c16e79",
  "status" : "waiting",
  "scan_type" : "manual",
  "created_at" : "2020-06-15T02:21:18.669Z",
  "num" : 0
}

Status code: 400

Invalid request.

{
  "error_code" : "DCS.4922",
  "error_msg" : "Does not support hotkey analyze."
}

Status Codes

Status Code

Description

200

Hot key analysis task created successfully.

400

Invalid request.

401

Invalid authentication information.

403

The request is rejected.

404

The requested resource is not found.

500

Internal service error.

Error Codes

See Error Codes.

Parent topic: Cache Analysis