Help Center > > User Guide> Configuring a Cluster> Custom Purchase of a Cluster

Custom Purchase of a Cluster

Updated at: Sep 02, 2021 GMT+08:00

The first step of using MRS is to purchase a cluster. This section describes how to create a cluster on the Custom Config tab of the MRS management console.

You can create an IAM user or user group on the IAM management console and grant it specific operation permissions, to perform refined resource management after registering an account. For details, see Creating a User and Granting Permissions.

  1. Log in to the MRS management console.
  2. Click Buy Cluster. The page for buying a cluster is displayed.

    When creating a cluster, pay attention to quota notification. If a resource quota is insufficient, increase the resource quota as prompted and create a cluster.

  3. Click the Custom Config tab.
  4. Configure cluster information by referring to Software Configurations and click Next.

    Figure 1 Software configurations

  5. Configure cluster information by referring to Hardware Configurations and click Next.

    Figure 2 Hardware configurations

  6. Set advanced options by referring to (Optional) Advanced Configuration and click Buy Now.

    If Kerberos authentication is enabled for a cluster, check whether Kerberos authentication is required. If yes, click Continue. If no, click Back to disable Kerberos authentication and then create a cluster.

    Figure 3 Advanced configurations

    For any doubt about the pricing, click Pricing details in the lower left corner.

  7. Click Back to Cluster List to view the cluster status.

    For details about cluster status during creation, see the description of the status parameters in Table 1.

    It takes some time to create a cluster. The initial status of the cluster is Starting. After the cluster has been created successfully, the cluster status becomes Running.

    On the MRS management console, a maximum of 10 clusters can be concurrently created, and a maximum of 100 clusters can be managed.

Software Configurations

Table 1 MRS cluster software configuration




Select a region.

Cloud service products in different regions cannot communicate with each other over an intranet. For low network latency and quick access, select the nearest region.

Cluster Name

The cluster name must be unique.

A cluster name can contain only 1 to 64 characters. Only letters, digits, hyphens (-), and underscores (_) are allowed.

The default name is mrs_xxxx. xxxx is a random collection of letters and digits.

Cluster Version

Currently, MRS 1.9.2 and MRS 3.1.0 are supported. The latest version of MRS is used by default.

Cluster Type

The cluster types are as follows:
  • Analysis cluster: is used for offline data analysis and provides Hadoop components.
  • Streaming cluster: is used for streaming tasks and provides stream processing components.
  • Hybrid cluster: is used for both offline data analysis and streaming processing and provides Hadoop components and streaming processing components. You are advised to use a hybrid cluster to perform offline data analysis and streaming processing tasks at the same time.
  • Custom: You can adjust the cluster service deployment mode based on service requirements. For details, see Customizing a Topology Cluster. (Custom is supported in MRS 3.x only.)

MRS streaming clusters do not support job and file management functions.


MRS components are as follows. For details about the component versions supported by MRS clusters of different versions, see .

Components of an analysis cluster:
  • Presto: open source and distributed SQL query engine
  • Hadoop: distributed system architecture
  • Spark: in-memory distributed computing framework (not supported in MRS 3.x)
  • Spark2x: A fast general-purpose engine for large-scale data processing. It is developed based on the open-source Spark2.x version. (supported only by MRS 3.x)
  • Hive: data warehouse framework built on Hadoop
  • OpenTSDB: a distributed, scalable time series database that can store and serve massive amounts of time series data without losing granularity (not supported in MRS 3.x)
  • HBase: distributed column-oriented database
  • Tez: an application framework which allows for a complex directed-acyclic-graph of tasks for processing data
  • Hue: provides the Hadoop UI capability, which enables users to analyze and process Hadoop cluster data on browsers
  • Loader: a tool based on source Sqoop 1.99.7, designed for efficiently transferring bulk data between Apache Hadoop and structured datastores such as relational databases

    Hadoop is mandatory, and Spark and Hive must be used together. Select components based on service requirements.

  • Flink: a distributed big data processing engine that can perform stateful computations over both finite and infinite data streams
  • Oozie: a Hadoop job scheduling system (supported only by MRS 3.x)
  • Alluxio: a memory speed virtual distributed storage system (not supported in MRS 3.x)
  • Ranger: a framework to enable, monitor, and manage data security across the Hadoop platform (Currently, Ranger does not support Kerberos authentication.)
  • Impala: an SQL query engine for processing huge volumes of data
  • ClickHouse: A column database management system (DBMS) for on-line analytical processing (OLAP). The ClickHouse cluster table engine that uses Kunpeng as the CPU architecture does not support HDFS and Kafka.
  • Kudu: a column-oriented data store
Components of a streaming cluster:
  • Kafka: distributed messaging system
  • KafkaManager: Kafka cluster monitoring management tool
  • Storm: distributed real-time computing system
  • Flume: distributed, reliable, and available service for efficiently collecting, aggregating, and moving large amounts of log data


Whether to use external data sources to store metadata.

  • Local: Metadata is stored in the local cluster.
  • Data connections: Metadata of external data sources is used. If the cluster is abnormal or deleted, metadata is not affected. This mode applies to scenarios where storage and compute are decoupled.

Clusters that support the Hive or Ranger component support this function.


This parameter is valid only when Metadata is set to Data connections. It indicates the type of an external data source. This function is not supported in MRS 3.x.

  • Hive
  • Ranger

Data Connection Type

This parameter is valid only when Metadata is set to Data connections. It indicates the type of an external data source.

  • Hive supports the following data connection types:
    • RDS PostgreSQL database
    • RDS MySQL database
    • Local database
  • Ranger supports the following data connection types:
    • RDS MySQL database
    • Local database

Data Connection Instance

This parameter is valid only when Data Connection Type is set to RDS PostgreSQL database or RDS MySQL database. This parameter indicates the name of the connection between the MRS cluster and the RDS database. This instance must be created before being referenced here. You can click Create Data Connection to create a data connection. For details, see Configuring Data Connections.

Hardware Configurations

Table 2 MRS cluster billing configuration



Billing Mode

MRS provides two billing modes.
  • Yearly/Monthly
  • Pay-per-use

Required Duration

This parameter is valid in Yearly/Monthly billing mode and indicates a cluster subscription duration. The minimum cluster duration is 1 month and the maximum available cluster duration is 1 year.

If Auto-renew is selected, monthly subscriptions are automatically renewed every month and yearly subscriptions are automatically renewed every year.

Table 3 MRS cluster hardware configuration




Select the AZ associated with the region of the cluster.

An AZ is a physical area that uses independent power and network resources. AZs are physically isolated but interconnected through the internal network. This improves the availability of applications. You are advised to create clusters in different AZs.


A VPC is a secure, isolated, and logical network environment.

Select the VPC for which you want to create a cluster and click View VPC to view the name and ID of the VPC. If no VPC is available, create one.


A subnet provides dedicated network resources that are isolated from other networks, improving network security.

Select the subnet for which you want to create a cluster. You can go to the VPC console to view the name and ID of the subnet created in the VPC. If no subnet is created in the VPC, go to the VPC console, and choose Subnets > Create Subnet to create one.


Do not associate the subnet with the network ACL.

Security Group

A security group is a set of ECS access rules. It provides access policies for ECSs that have the same security protection requirements and are mutually trusted in a VPC.

When you create a cluster, you can select Auto create from the drop-down list of Security Group to create a security group or select an existing security group.


When you select a security group created by yourself, ensure that the inbound rule contains a rule in which Protocol is set to All, Port is set to All, and Source is set to a trusted accessible IP address range. Do not use as a source address. Otherwise, security risks may occur. If you do not know the trusted accessible IP address range, select Auto create.


After binding an EIP to an MRS cluster, you can use the EIP to access the Manager web UI of the cluster.

When creating a cluster, you can select an available EIP from the drop-down list and bind it. If no EIP is available in the drop-down list, click Manage EIP to access the EIPs service page to purchase one.


The EIP must be in the same region as the cluster.

Enterprise Project

Select the enterprise project to which a cluster belongs. To use an enterprise project, create one on the Enterprise Project Management page of the Enterprise Management console.

The Enterprise Management console of the enterprise project is designed for resource management. It helps enterprises manage cloud-based personnel, resources, permissions, and finance in a hierarchical manner, such as management of companies, departments, and projects.

Table 4 Cluster node information



CPU Architecture

CPU architecture supported by MRS: This parameter is unavailable in MRS 3.x.

  • x86: The x86-based CPU architecture uses Complex Instruction Set Computing (CISC). Each instruction can be used to execute low-level hardware operations. The number of instructions is large, and the length of each instruction is different. Therefore, executing such an instruction is complex and time-consuming.
  • Kunpeng: The Kunpeng-based CPU architecture uses Reduced Instruction Set Computing (RISC). RISC is a microprocessor that executes fewer types of computer instructions but at a higher speed than CISC. RISC simplifies the computer architecture and improves the running speed. Compared with the x86-based CPU architecture, the Kunpeng-based CPU architecture has a more balanced performance and power consumption ratio. Kunpeng features high density, low power consumption, high cost-effectiveness.

Common Template

This parameter is valid only when Cluster Type is set to Custom. For details, see Custom Cluster Template Description.

Node Type

MRS provides three types of nodes:

  • Master: A Master node in an MRS cluster manages the cluster, assigns executable cluster files to Core nodes, traces the execution status of each job, and monitors the DataNode running status.
  • Core: A Core node in a cluster processes data and stores process data in HDFS. Analysis Core nodes are created in an analysis cluster. Streaming Core nodes are created in a streaming cluster. Both analysis and streaming Core nodes are created in a hybrid cluster.
  • Task: A Task node in a cluster is used for computing and does not store persistent data. Yarn and Storm are mainly installed on Task nodes. Task nodes are optional, and the number of Task nodes can be zero. Analysis Task nodes are created in an analysis cluster. Streaming Task nodes are created in a streaming cluster. Both analysis and streaming Task nodes are created in a hybrid cluster.
    When the data volume change is small in a cluster but the cluster's service processing capabilities need to be remarkably and temporarily improved, add Task nodes to address the following situations:
    • Service volumes temporarily increase, for example, report processing at the end of the year.
    • Long-term tasks must be completed in a short time, for example, some urgent analysis tasks.

Billing Mode

Billing mode of nodes in a cluster.

  • The billing mode of Master and Core nodes is the same as that of the cluster.
  • The billing mode of Task nodes is fixed to Pay-per-use, that is, Task nodes in a yearly/monthly subscribed cluster are still billed in a pay-per-use basis.

Instance Specifications

Instance specifications of Master or Core nodes. MRS supports host specifications determined by CPU, memory, and disk space. See ECS Specifications Used by MRS and BMS Specifications Used by MRS to obtain the allowed instance specifications. Click to configure the instance specifications, system disk, and data disk parameters of the cluster node.

MRS supports BMS specifications only when the billing mode of a cluster is Yearly/Monthly.

MRS supports the following hybrid deployment of ECSs and BMSs:

  • Master, Core, and Task nodes are deployed on ECSs.
  • Master and Core nodes are deployed on BMSs, and Task nodes are deployed on ECSs.
  • Master nodes are deployed on either ECSs or BMSs, Core nodes are deployed on either ECSs or BMSs, and Task nodes are deployed on ECSs.

Tenants share physical resources of ECSs, but can exclusively use resources of BMSs. BMSs can better meet your requirements for deploying key applications and services that require high performance (such as big data clusters and enterprise middleware systems) and a secure and reliable running environment.

If BMS specifications are used, Master node specifications cannot be scaled up.

  • More advanced instance specifications provide better data processing. However, they require higher cluster cost.
  • If you select HDDs for Core nodes, there is no billing information for data disks. The fees are charged with ECSs.
  • If you select non-HDD disks for Core nodes, the disk types of Master and Core nodes are determined by Data Disk.
  • If Sold out appears next to an instance specification of a node, the node of this specification cannot be purchased. You can only purchase nodes of other specifications.
  • The Master node specification (4 vCPUs 8 GB) is not within the SLA after-sales scope. It is applicable only to the test environment and is not recommended for the production environment.
  • If the cluster version is set to MRS 3.x and all components are deployed, the memory of the Master node must be at least 64 GB.

System Disk

Storage type and storage space of the system disk on a node.

  • Device type
    • SATA: Common I/O
    • SAS: High I/O
    • SSD: Ultra-high I/O
  • Storage space: 40 GB to 1000 GB

Data Disk

Data disk storage space of a node. To increase data storage capacity, you can add disks at the same time when creating a cluster. The following two application scenarios are involved.

  • Data storage and computing are separated. Data is stored in OBS, which features low cost and unlimited storage capacity. The clusters can be terminated at any time in OBS. The computing performance is determined by OBS access performance and is lower than that of HDFS. This configuration is recommended if data computing is infrequent.
  • Data storage and computing are not separated. Data is stored in HDFS, which features high cost, high computing performance, and limited storage capacity. Before terminating clusters, you must export and store the data. This configuration is recommended if data computing is frequent.

Currently, SATA, SAS, and SSD storage types are supported.

  • SATA: Common I/O
  • SAS: High I/O
  • SSD: Ultra-high I/O

Value range: 100 GB to 32,000 GB


More nodes in a cluster require higher disk capacity of Master nodes. To ensure stable cluster running, set the disk capacity of the Master node to over 600 GB if the number of nodes is 300 and increase it to over 1 TB if the number of nodes reaches 500.

Instance Count

Number of Master and Core nodes.

For Master nodes:

  • If Cluster HA is enabled, the number of Master nodes is fixed to 2.
  • If Cluster HA is disabled, the number of Master nodes is fixed to 1.

At least one Core node must exist and the total number of Core and Task nodes cannot exceed 500.

Task: Click to add a Task node. Click to modify the instance specifications and disk configuration of a Task node. Click to delete the added Task node.

  • A maximum of 500 Core nodes are supported by default. If more than 500 Core nodes are required, increase the quota. For details, see Quotas.
  • A small number of nodes may cause clusters to run slowly while a large number of nodes may be unnecessarily costly. Set an appropriate value based on data to be processed.

Cluster HA

Whether to enable high availability for a cluster. This parameter is enabled by default. This parameter is not available in MRS 3.x.

If you enable this option, the management processes of all components will be deployed on both Master nodes to achieve hot standby and prevent single-node failure, improving reliability. If you disable this option, they will be deployed on only one Master node. As a result, if a process of a component becomes abnormal, the component will fail to provide services.

  • : Disabled. When Cluster HA is disabled, there is only one Master node and the number of Core nodes is three by default. However, you can decrease the number of Core nodes to 1.
  • : Enabled. When Cluster HA is enabled, there are two Master nodes and the number of Core nodes is three by default. However, you can decrease the number of Core nodes to 1.


This parameter is valid when a streaming Core node is created only. Click this parameter to enable or disable the disk LVM management function.

If LVM is enabled, all disks on a node are mounted as logical volumes. This delivers more proper disk planning to avoid data skew, thereby improving system stability.

Topology Adjustment

If the deployment mode in the Common Node does not meet the requirements, set Topology Adjustment to Enable and adjust the instance deployment mode based on service requirements. For details, see Topology Adjustment for a Custom Cluster. This parameter is valid only when Cluster Type is set to Custom.

(Optional) Advanced Configuration

Table 5 MRS cluster advanced configuration topology




For details, see Adding a Tag to a Cluster.

Auto Scaling

Auto scaling can be configured only after you specify Task node specifications in the Configure Hardware step. For details about how to configure Task node specifications, see Configuring Auto Scaling Rules When Creating a Cluster.

Bootstrap Action

For details, see Adding a Bootstrap Action. This parameter is not available in MRS 3.x.


An agency allows ECS or BMS to manage MRS resources. You can configure an agency of the ECS type to automatically obtain the AK/SK to access OBS. For details, see Configuring a Storage-Compute Decoupled Cluster (Agency).

The MRS_ECS_DEFAULT_AGENCY agency has the OBSOperateAccess permission of OBS and the CESFullAccess (for users who have enabled fine-grained policies), CES Administrator, and KMS Administrator permissions in the region where the cluster is located.

Metric Sharing

Monitoring metrics of big data components are collected. If a fault occurs when you use a cluster, share the monitoring metrics with HUAWEI CLOUD technical support personnel for troubleshooting. This parameter is not available in MRS 3.x.

OBS Permission Control

Users who have enabled fine-grained permission control can use this function to grant permissions on different directories in OBS file systems to different MRS users. For details, see Configuring Fine-Grained Permissions for MRS Multi-User Access to OBS. This parameter is not available in MRS 3.x.

Data Disk Encryption

Whether to encrypt data in the data disk mounted to the cluster. This function is disabled by default. To use this function, you must have the Security Administrator and KMS Administrator permissions. This parameter is not available in MRS 3.x.

Keys used by encrypted data disks are provided by the Key Management Service (KMS) of the Data Encryption Workshop (DEW), secure and convenient. Therefore, you do not need to establish and maintain the key management infrastructure.

Click Data Disk Encryption to enable or disable the data disk encryption function. For details, see EVS Disk Encryption.

Key ID

This parameter is displayed only when the Data Disk Encryption function is enabled. This parameter indicates the key ID corresponding to the selected key name. This parameter is not available in MRS 3.x.

Key Name

This parameter is mandatory when the Data Disk Encryption function is enabled. Select the name of the key used to encrypt the data disk. By default, the default master key named evs/default is selected. You can select another master key from the drop-down list. This parameter is not available in MRS 3.x.

If disks are encrypted using a CMK, which is then disabled or scheduled for deletion, the disks can no longer be read from or written to, and data on these disks may never be restored. Exercise caution when performing this operation.

Click View Key List to enter a page where you can create and manage keys.


If the alarm function is enabled, the cluster maintenance personnel can be notified in a timely manner to locate faults when the cluster runs abnormally or the system is faulty.

Rule Name

Name of the rule for sending alarm messages. The value can contain only digits, letters, hyphens (-), and underscores (_).

Topic Name

Select an existing topic or click Create Topic to create a topic. To deliver messages published to a topic, you need to add a subscriber to the topic. For details, see Adding Subscriptions to a Topic.

A topic serves as a message sending channel, where publishers and subscribers can interact with each other.

Kerberos Authentication

Whether to enable Kerberos authentication when logging in to Manager.

  • : If Kerberos Authentication is disabled, common users can use all functions of an MRS cluster. You are advised to disable Kerberos authentication in single-user scenarios. If Kerberos authentication is disabled, you can follow instructions in Security Configuration Suggestions for Clusters with Kerberos Authentication Disabled to perform security configuration.
  • : If Kerberos Authentication is enabled, common users cannot use the file and job management functions of an MRS cluster and cannot view cluster resource usage or the job records for Hadoop and Spark. To use more cluster functions, the users must contact the Manager administrator to assign more permissions. You are advised to enable Kerberos authentication in multi-user scenarios.

If the Ranger component is selected, Kerberos authentication cannot be enabled.


Name of the administrator of Manager. admin is used by default.


Password of the Manager administrator

The following requirements must be met:

  • Must contain 8 to 26 characters.
  • Must contain at least four of the following:
    • Lowercase letters
    • Uppercase letters
    • Digits
    • Have at least one of the following special characters: !?,.: -_{} [ ]@ $% ^ + = /
  • Cannot be the same as the username or the username spelled backwards.

Password Strength: The colorbar in red, orange, and green indicates weak, medium, and strong password, respectively.

Confirm Password

Enter the password of the Manager administrator again.

Login Mode

  • Password

    You can log in to ECS nodes using a password.

    A password must meet the following requirements:

    1. Must be a string and 8 to 26 characters long.
    2. The password must contain at least four types of the following characters: uppercase letters, lowercase letters, digits, and special characters (! ?,.: -_{} [ ]@ $% ^ + = /).
    3. The password cannot be the username or the reverse username.
  • Key Pair

    Key pairs are used to log in to ECS nodes of the cluster. Select a key pair form the drop-down list. Select "I acknowledge that I have obtained private key file SSHkey-xxx and that without this file I will not be able to log in to my ECS." If you have never created a key pair, click View Key Pair to create or import a key pair. And then, obtain a private key file.

    A key pair, also called an SSH key, consists of a public key and a private key. You can create an SSH key and download the private key for authenticating remote login. For security, a private key can only be downloaded once. Keep it secure.

    Use an SSH key in either of the following two methods:

    1. Creating an SSH key: After you create an SSH key, a public key and a private key are generated. The public key is stored in the system, and the private key is stored in the local ECS. When you log in to an ECS, the public and private keys are used for authentication.
    2. Importing an SSH key: If you have obtained the public and private keys, import the public key into the system. When you log in to an ECS, the public and private keys are used for authentication.

Secure Communications

MRS clusters provision, manage, and use big data components through the management console. Big data components are deployed in a user's VPC. If the MRS management console needs to directly access big data components deployed in the user's VPC, you need to enable the corresponding security group rules after you have obtained user authorization. This authorization process is called secure communications. For details, see Communication Security Authorization.

If the secure communications function is not enabled, MRS clusters cannot be created.

Failed to Create a Cluster

If a cluster fails to be created, the failed task will be managed on the Manage Failed Tasks page. Choose Clusters > Active Clusters. Click shown in Figure 4 to go to the Manage Failed Tasks page. In the Status column, hover the cursor over to view the failure cause, as shown inFigure 5. You can delete failed tasks by referring to Deleting a Failed Task.

Figure 4 Failed task management
Figure 5 Failure cause

Table 6 lists the error codes of MRS cluster creation failures.

Table 6 Error codes

Error Code



Insufficient quota to meet your request. Contact customer service to increase the quota.


The token cannot be null or invalid. Try again later or contact customer service.


Invalid request. Try again later or contact customer service.


Insufficient resources. Try again later or contact customer service.


Insufficient IP addresses in the existing subnet. Try again later or contact customer service.


Failed due to an ECS error. Try again later or contact customer service.


Failed due to an IAM error. Try again later or contact customer service.


Failed due to a VPC error. Try again later or contact customer service.


MRS system error. Try again later or contact customer service.

Did you find this page helpful?

Submit successfully!

Thank you for your feedback. Your feedback helps make our documentation better.

Failed to submit the feedback. Please try again later.

Which of the following issues have you encountered?

Please complete at least one feedback item.

Content most length 200 character

Content is empty.

OK Cancel