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Creating a Stream

Function

This API is used to create a stream.

  • When creating a stream, specify a stream type (common or advanced) and the number of partitions.

  • A maximum of 10 advanced stream partitions and 50 common stream partitions can be created for an account by default. You can submit a work order to increase the quota.

Calling Method

For details, see Calling APIs.

URI

POST /v2/{project_id}/streams

Table 1 Path Parameters

Parameter

Mandatory

Type

Description

project_id

Yes

String

Project ID

Request Parameters

Table 2 Request header parameters

Parameter

Mandatory

Type

Description

X-Auth-Token

Yes

String

User token.

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

Table 3 Request body parameters

Parameter

Mandatory

Type

Description

stream_name

Yes

String

Stream name.

The stream name can contain 1 to 64 characters, including letters, digits, underscores (_), and hyphens (-).

Maximum: 64

partition_count

Yes

Integer

Number of partitions.

Partitions are the base throughput unit of the DIS stream.

stream_type

No

String

Stream type.

  • COMMON: a common stream with a bandwidth of 1 Mbit/s

  • ADVANCED: an advanced stream with a bandwidth of 5 Mbit/s

Enumeration values:

  • COMMON

  • ADVANCED

data_type

No

String

Source data type.

  • BLOB: a collection of binary data stored as a single entity in a database management system

  • JSON: an open-standard file format that uses human-readable text to transmit data objects consisting of attribute-value pairs and array data types

  • CSV: a simple text format for storing tabular data in a plain text file. Commas are used as delimiters.

Default value: BLOB

Enumeration values:

  • BLOB

  • JSON

  • CSV

data_duration

No

Integer

Data retention period.

Value range: 24–72

Unit: hour

If this parameter is left unspecified, the default value will be used.

Default: 24

auto_scale_enabled

No

Boolean

Whether to enable auto scaling.

  • true: Auto scaling is enabled.

  • false: Auto scaling is disabled.

By default, auto scaling is disabled.

Default: false

auto_scale_min_partition_count

No

Long

Minimum number of partitions for automatic scale-down when auto scaling is enabled.

Minimum: 1

auto_scale_max_partition_count

No

Integer

Maximum number of partitions for automatic scale-up when auto scaling is enabled.

data_schema

No

String

Source data structure that defines JSON and CSV formats. It is described in the syntax of the Avro schema.

csv_properties

No

CSVProperties object

Attributes of data in CSV format, such as delimiter

compression_format

No

String

Data compression type. Currently, the following compression types are supported:

  • snappy

  • gzip

  • zip

By default, data is not compressed.

Enumeration values:

  • snappy

  • gzip

  • zip

tags

No

Array of Tag objects

List of stream tags

sys_tags

No

Array of SysTag objects

Stream enterprise projects

Table 4 CSVProperties

Parameter

Mandatory

Type

Description

delimiter

No

String

Data separator

Table 5 Tag

Parameter

Mandatory

Type

Description

key

No

String

Tag key.

  • It cannot be left blank.

  • It must be unique for each resource.

  • It can contain uppercase and lowercase letters, digits, hyphens (-), underscores (_), and Unicode characters (\u4E00-\u9FFF).

Minimum: 1

Maximum: 36

value

No

String

Value.

  • It can contain a maximum of 43 characters.

  • It can contain uppercase and lowercase letters, digits, periods (.), hyphens (-), underscores (_), and Unicode characters (\u4E00-\u9FFF).

  • It can only contain digits, letters, hyphens (-), and underscores (_).

Minimum: 0

Maximum: 43

Table 6 SysTag

Parameter

Mandatory

Type

Description

key

No

String

Tag key.

  • It cannot be left blank.

  • Its value must be _sys_enterprise_project_id.

status

No

String

Enumeration values:

  • _sys_enterprise_project_id

value

No

String

Value.

The value is the enterprise project ID, which needs to be obtained on the enterprise management page.

  • It is a 36-digit UUID.

Response Parameters

None

Example Requests

Creating a Stream

POST https://{Endpoint}/v2/{project_id}/streams

{
  "stream_name" : "newstream",
  "partition_count" : 3,
  "data_duration" : 24
}

Example Responses

None

SDK Sample Code

The SDK sample code is as follows.

Java

Creating a Stream

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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.dis.v2.region.DisRegion;
import com.huaweicloud.sdk.dis.v2.*;
import com.huaweicloud.sdk.dis.v2.model.*;


public class CreateStreamSolution {

    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");

        ICredential auth = new BasicCredentials()
                .withAk(ak)
                .withSk(sk);

        DisClient client = DisClient.newBuilder()
                .withCredential(auth)
                .withRegion(DisRegion.valueOf("<YOUR REGION>"))
                .build();
        CreateStreamRequest request = new CreateStreamRequest();
        CreateStreamReq body = new CreateStreamReq();
        body.withDataDuration(24);
        body.withPartitionCount(3);
        body.withStreamName("newstream");
        request.withBody(body);
        try {
            CreateStreamResponse response = client.createStream(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

Creating a Stream

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# coding: utf-8

import os
from huaweicloudsdkcore.auth.credentials import BasicCredentials
from huaweicloudsdkdis.v2.region.dis_region import DisRegion
from huaweicloudsdkcore.exceptions import exceptions
from huaweicloudsdkdis.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"]

    credentials = BasicCredentials(ak, sk)

    client = DisClient.new_builder() \
        .with_credentials(credentials) \
        .with_region(DisRegion.value_of("<YOUR REGION>")) \
        .build()

    try:
        request = CreateStreamRequest()
        request.body = CreateStreamReq(
            data_duration=24,
            partition_count=3,
            stream_name="newstream"
        )
        response = client.create_stream(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

Creating a Stream

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package main

import (
	"fmt"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic"
    dis "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/dis/v2"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/services/dis/v2/model"
    region "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/dis/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")

    auth := basic.NewCredentialsBuilder().
        WithAk(ak).
        WithSk(sk).
        Build()

    client := dis.NewDisClient(
        dis.DisClientBuilder().
            WithRegion(region.ValueOf("<YOUR REGION>")).
            WithCredential(auth).
            Build())

    request := &model.CreateStreamRequest{}
	dataDurationCreateStreamReq:= int32(24)
	request.Body = &model.CreateStreamReq{
		DataDuration: &dataDurationCreateStreamReq,
		PartitionCount: int32(3),
		StreamName: "newstream",
	}
	response, err := client.CreateStream(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

201

Created

Error Codes

See Error Codes.

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