E-MapReduce
E-MapReduce
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E-MapReduceAPI referenceEMR on ECS API referenceCalling methodsPublic parameters
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Download PDFCopy pageDownload PDFAll API requests must include public parameters. To avoid redundant descriptions, this document does not repeat these parameters. Please ensure that you include these parameters when making API requests; otherwise, the request will fail the validity check.
Action&Version
Action and Version must be placed in the query.
Name | Type | Required | Parameter format | Description |
|---|---|---|---|---|
Action | String | Yes | [a-zA-Z]+ | The name of the API, related to the specific interface, indicates the operation to be performed. |
Version | String | Yes | YYYY-MM-DD | Version information of the API. The current version is 2020-04-01. |
X-Expires | Int | No | 300 | Validity period of the signature, unit: seconds. The default is 900 seconds if not specified. |
Signature parameters
Signature parameters are essential for requests and can be included in the header or query.
Scenario in the header
Name | Type | Required | Description |
|---|---|---|---|
X-Date | String | Yes | 20201103T104027Z, using UTC time, accurate to the second. |
Authorization | String | Yes | HMAC-SHA256 Credential={AccessKey}/{ShortDate}/{Region}/{Service}/request, SignedHeaders={SignedHeaders}, Signature={Signature} |
The meaning of the information in Authorization is as follows:
Name | Type | Remarks |
|---|---|---|
AccessKey | String | The AK for the request. |
ShortDate | String | The short date for the request, accurate to the day. Use UTC time, for example: 20180201. |
Region | String | The Region for the request, for example: North China 2 (Beijing): cn-beijing. |
Service | String | The service for the request. When calling instance, image, and batch job APIs, use: ecs
|
SignedHeaders | String | Headers involved in the signature, separated by semicolons. |
Signature | String | The calculated signature. For the signature calculation method, see Signature method. |
Scenario in the query
The information for X-Date and Authorization can be directly included in the query.
Name | Type | Required | Description |
|---|---|---|---|
X-Date | String | Yes | 20201103T104027Z, using UTC time, accurate to the second. |
X-Algorithm | String | Yes | Fixed value: HMAC-SHA256; reserved for future expansion. |
X-Credential | String | Yes | Composed of {AccessKey}/{ShortDate}/{Region}/{Service}/request. |
X-SignedHeaders | String | Yes | Headers involved in the signature, separated by semicolons. |
X-Signature | String | Yes | The calculated signature. For the signature calculation method, see Signature method. |
