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E-MapReduce

E-MapReduce

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Invocation methods
Public parameters
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Public parameters

All API requests must include public parameters. To avoid redundant descriptions, the product's API documentation may not repeat these parameters. Please ensure that you include these parameters when requesting APIs; otherwise, the request will fail the validity check.

The public parameters are listed in the table below.

Action & Version

tip

Action and Version must be placed in the query.

Name

Type

Required

Parameter format

Description

Example value

Action

String

Yes

[a-zA-Z]+

API name. For actual usage, refer to the API documentation of your product for the value.

CreateUser

Version

String

Yes

YYYY-MM-DD

API version. For actual usage, refer to the API documentation of your product for the value.

2018-01-01

X-Expires

Int

No

Integer

Signature validity period, unit: seconds. If not specified, the default value is 900.

900

Signature parameters

tip

Signature parameters can be included in the query or in the header.

Scenario in Header

Name

Type

Required

Description

Example value

X-Date

String

Yes

Use UTC time, accurate to the second, in ISO 8601 format: YYYYMMDD'T'HHMMSS'Z'

20201103T104027Z

Authorization

String

Yes

HMAC-SHA256 Credential={AccessKeyId}/{ShortDate}/{Region}/{Service}/request, SignedHeaders={SignedHeaders}, Signature={Signature} 。 For construction details, refer to Signature method

HMAC-SHA256 Credential=AKLTMjI2ODVlYzI3ZGY1NGU4ZjhjYWRjMTlmNTM5OTZkYzE/20201230/cn-north-1/emr/request, SignedHeaders=content-type;host;x-content-sha256;x-date, Signature=28eeabbbd726b87002e0fe58ad8c1c768e619b06e2646f35b6ad7ed029a6d8a7

X-Security-Token

String

No

Refers to the SessionToken in the temporary security credentials issued by Security Token Service (STS). This parameter is not required when using a long-term key.

nCitKRW94N1M5aTcwQ0tTY2dpRlM0bHczaVlaekpHdnZUd253QkI2OWxQSE9N.Cj8KK09aVXA4TEstYVg5RkE3dHdqTVhNVk8wRnFjdGI3WF9mQ0RQZ3JwV3d3eTgSEFbw1JQe0EEKsrdI3CLVHosQsMXHqQYYwOHHqQYgoJaAASgBMKCWgAE6B0V4YW1wbGVCA2lhbVIMU2Vzc2lvbiBOYW1lWAFgAQ.TEMEegRPn47UwXZqD742jSTU2tzCPUWaTSsQw7CuSXGa1PlhtQfjXFbPodBHhKTdMCF8_K10OhBF6FXy4eoPQw

Meaning of information in Authorization:

Name

Type

Remarks

Example value

AccessKeyId

String

Access Key ID for the request.

AKLTMjI2ODVlYzI3ZGY1NGU4ZjhjYWRjMTlmNTM5OTZkYzE

ShortDate

String

Short date for the request, using UTC time, accurate to the day. Please use the format: YYYYMMDD.

20180201

Region

String

Region for the request, for example: cn-beijing. If the product you use provides services by region, fill in the actual region you want to access for this parameter. If you use a product that does not provide region-based services, you can fill in any region, for example cn-beijing.

cn-beijing

Service

String

Service name for the request, for example: emr.

emr

SignedHeaders

String

Headers involved in the signature. Multiple headers are separated by semicolons. This specifies which headers are included in the signature calculation, so that extra headers added by proxies are ignored. If host and x-date exist in the header, they must be included in the signature.

content-type;host;x-content-sha256;x-date

Signature

String

Calculated signature. For details, refer to Signature method.

28eeabbbd726b87002e0fe58ad8c1c768e619b06e2646f35b6ad7ed029a6d8a7

Scenario in Query

Name

Type

Required

Description

Example value

X-Date

String

Yes

Use UTC time, accurate to the second.

20201103T104027Z

X-Algorithm

String

Yes

Fixed value: HMAC-SHA256.

HMAC-SHA256

X-Credential

String

Yes

Composed of {AccessKeyId}/{ShortDate}/{Region}/{Service}/request.

AKLTMjI2ODVlYzI3ZGY1NGU4ZjhjYWRjMTlmNTM5OTZkYzE/20201230/cn-north-1/iam/request

X-SignedHeaders

String

Yes

Headers involved in the signature. Multiple headers are separated by semicolons to specify which headers are included in the signature calculation, thereby ignoring additional headers added to the request by a proxy. If the host or x-date headers are present, they must be included.

content-type;host;x-content-sha256;x-date

X-Signature

String

Yes

The computed signature. For detailed instructions, refer to Signature method.

28eeabbbd726b87002e0fe58ad8c1c768e619b06e2646f35b6ad7ed029a6d8a7

Last updated: 2026.06.01 16:42:34