Before You Start

Welcome to MapReduce Service (MRS) API Reference. MRS provides enterprise-level big data clusters on the cloud. You can control your clusters and easily run big data components such as Hadoop, Spark, HBase, Kafka, and Storm in the clusters.

This document describes how to use application programming interfaces (APIs) to perform operations on MRS, such as creating or deleting clusters, adjusting nodes, as well as creating and executing jobs. For details about all supported operations, see API Overview.

If you plan to access MRS through an API, ensure that you are familiar with MRS concepts. For details, see Service Overview.

MRS 3.x does not support V1.1 APIs. You need to use V2 APIs. If you still need to use V1.1 APIs, obtain them from Out-of-Date APIs.

Endpoints

An endpoint is the request address for calling an API. Endpoints vary depending on services and regions. For the endpoints of services, see Regions and Endpoints.

Concepts

Account
An account is created upon successful registration with HUAWEI CLOUD. The account has full access permissions for all of its cloud services and resources. It can be used to reset user passwords and grant user permissions. The account is a payment entity. For security purposes, do not directly use the account to perform routine management but create IAM users and grant them permissions for routine management.
User
An IAM user is created using an account to use cloud services. Each IAM user has its own identity credentials (password and access keys).

An IAM user can view the account ID and user ID on the My Credentials page of the console. The account name, username, and password will be required for API authentication.
Region
Regions are divided based on geographical location and network latency. Public services, such as Elastic Cloud Server (ECS), Elastic Volume Service (EVS), Object Storage Service (OBS), Virtual Private Cloud (VPC), Elastic IP (EIP), and Image Management Service (IMS), are shared within the same region. Regions are classified as common regions and dedicated regions. A common region provides common cloud services that should be made available to all tenants. A dedicated region provides services of a specific type or only for specific tenants.

For details, see Region and AZ.
AZ
An availability zone (AZ) comprises one or more physical data centers equipped with independent ventilation, fire, water, and electricity facilities. Compute, network, storage, and other resources in an AZ are logically divided into multiple clusters. AZs within a region are connected using high-speed optical fibers to support cross-AZ high-availability systems.
Project
Projects group and isolate resources (including compute, storage, and network resources) across physical regions. A default project is provided for each HUAWEI CLOUD region, and subprojects can be created under each default project. Users can be granted permissions to access all resources in a specific project. If you need more refined access control, you can create subprojects under a default project and purchase resources in subprojects. Then you can assign required permissions for users to access only resources in specific subprojects.

Figure 1 Project isolating model

To view a project ID, go to the My Credentials page.
Enterprise Project
Enterprise projects group and logically isolate resources. An enterprise project can contain resources from different regions, and resources can be transferred between enterprise projects.

For details about how to obtain enterprise project IDs and features, see the Enterprise Management Service User Guide.