GetTopic - DataHub - Alibaba Cloud Documentation Center

Queries topic information.

Operation description

Queries topic information.

Try it now

Try this API in OpenAPI Explorer, no manual signing needed. Successful calls auto-generate SDK code matching your parameters. Download it with built-in credential security for local usage.

Test

RAM authorization

The table below describes the authorization required to call this API. You can define it in a Resource Access Management (RAM) policy. The table's columns are detailed below:

Action: The actions can be used in the Action element of RAM permission policy statements to grant permissions to perform the operation.
API: The API that you can call to perform the action.
Access level: The predefined level of access granted for each API. Valid values: create, list, get, update, and delete.
Resource type: The type of the resource that supports authorization to perform the action. It indicates if the action supports resource-level permission. The specified resource must be compatible with the action. Otherwise, the policy will be ineffective.
- For APIs with resource-level permissions, required resource types are marked with an asterisk (*). Specify the corresponding Alibaba Cloud Resource Name (ARN) in the Resource element of the policy.
- For APIs without resource-level permissions, it is shown as All Resources. Use an asterisk (*) in the Resource element of the policy.
Condition key: The condition keys defined by the service. The key allows for granular control, applying to either actions alone or actions associated with specific resources. In addition to service-specific condition keys, Alibaba Cloud provides a set of common condition keys applicable across all RAM-supported services.
Dependent action: The dependent actions required to run the action. To complete the action, the RAM user or the RAM role must have the permissions to perform all dependent actions.

Action

Access level

Resource type

Condition key

Dependent action

dhs:GetTopic

get

*Topic

acs:dhs:{#regionId}:{#accountId}:projects/{#ProjectName}/topics/{#TopicName}

None

Request parameters

Parameter	Type	Required	Description	Example
ProjectName	string	Yes	The project name.	test_project
TopicName	string	Yes	The topic name.	test_topic

Response elements

Element	Type	Description	Example
	object
RequestId	string	The request ID.	A20A7093-8FE0-058C-BE0C-3C8057D5F1A1
Success	boolean	Indicates whether the request was successful.	True
ProjectName	string	The project name.	test_project
TopicName	string	The topic name.	test_topic
RecordType	string	The topic type.	TUPLE
Lifecycle	integer	The lifecycle.	3
ShardCount	integer	The number of shards.	3
Storage	integer	The total storage of the topic.	12252454
ExpandMode	boolean	Indicates whether the expansion mode is enabled.	true
EnableSchemaRegistry	boolean	Indicates whether multiple versions are supported.	false
RecordSchema	string	The data schema for the TUPLE type.	[{\"Type\":\"STRING\",\"AllowNull\":true,\"Name\":\"str\"},{\"Type\":\"STRING\",\"AllowNull\":true,\"Name\":\"dt\"}]
Comment	string	The topic description.	test_comment
Creator	string	The topic creator.	1397493986831962
CreateTime	string	The creation time.	1724041098000
UpdateTime	string	The last update time.	1724041098000

Examples

Success response

JSON format

{
  "RequestId": "A20A7093-8FE0-058C-BE0C-3C8057D5F1A1",
  "Success": true,
  "ProjectName": "test_project",
  "TopicName": "test_topic\n",
  "RecordType": "TUPLE",
  "Lifecycle": 3,
  "ShardCount": 3,
  "Storage": 12252454,
  "ExpandMode": true,
  "EnableSchemaRegistry": false,
  "RecordSchema": "[{\\\"Type\\\":\\\"STRING\\\",\\\"AllowNull\\\":true,\\\"Name\\\":\\\"str\\\"},{\\\"Type\\\":\\\"STRING\\\",\\\"AllowNull\\\":true,\\\"Name\\\":\\\"dt\\\"}]",
  "Comment": "test_comment",
  "Creator": "1397493986831962",
  "CreateTime": "1724041098000",
  "UpdateTime": "1724041098000"
}

Error codes

HTTP status code	Error code	Error message	Description
400	InvalidParameter	Error:%s.	The parameter entered is illegal
400	MissingParameter	Error:%s.	Missing required parameters
500	InternalServerError	Error:%s.	Server error, server unavailable or unexpected error occurred
403	NoPermission	Error:%s.	You are not authorized to perform this operation.
403	OperationDenied	Error:%s.	Operation denied
404	ResourceNotFound	Error:%s.	Resource does not exist

See Error Codes for a complete list.

Release notes

See Release Notes for a complete list.