Help Center > > User Guide> Configuring Clusters> Creating a Cluster (History Versions)

Creating a Cluster (History Versions)

Updated at: Dec 31, 2019 GMT+08:00

When clusters are created, their parameters and parameter configurations vary depending on cluster versions.

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.

Creating an MRS 1.8.10 Cluster

  1. Log in to the MRS management console.
  2. Click Buy Cluster and open the Buy Cluster page.

    Note the usage of quotas when you create a cluster. If the resource quotas are insufficient, increase quotas as prompted before creating a cluster.

  3. Configure basic cluster information by referring to the following tables.

    Table 1 Basic cluster configuration information



    Billing Mode

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


    Select a region.


    An availability zone (AZ) is a physical area that uses independent power and network resources. In this way, applications are interconnected using internal networks but are physically isolated. As a result, application availability is improved. It is recommended that you create clusters in different AZs.

    MRS enables an AZ to be randomly selected to prevent excessive VMs to be created in the specified default AZ and avoid uneven resource occupation among AZs. MRS also enables a tenant's all VMs to be created in one AZ as much as possible.

    If your VMs must be located in different AZs, specify AZs when creating VMs. In a multi-user and multi-AZ scenario, each user tries to obtain a default AZ that is different from other users' default AZs.

    Select an AZ of the region in the cluster.

    Cluster Name

    Cluster name, which is globally 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, where xxxx is a random combination of four letters and numbers.

    Cluster Version

    Currently, MRS 1.8.7 and MRS 2.0.1 are supported.

    The latest version of MRS is used by default.

    Enterprise Project

    Select the enterprise project to which the 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.

    Kerberos Authentication

    Indicates whether to enable Kerberos authentication when logging in to MRS Manager. Possible values are as follows:

    • If Kerberos authentication is disabled, you 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 MRS Manager administrator to assign more permissions. You are advised to enable Kerberos authentication in multi-user scenarios.

    You can click or to disable or enable Kerberos authentication, respectively.

    After creating MRS clusters with Kerberos authentication enabled, users can manage running clusters on MRS Manager. For details, see Accessing MRS Manager Supporting Kerberos Authentication.


    Indicates the username for the administrator of MRS Manager. admin is used by default.


    Indicates the password of the MRS Manager administrator.

    • Must contain 8 to 32 characters.
    • Must contain at least three types of the following:
      • Lowercase letters
      • Uppercase letters
      • Digits
      • Special characters: `~!@#$%^&*()-_=+\|[{}];:'",<.>/?
      • Spaces
    • Must be different from the username.
    • Must be different from the username written in reverse order.

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

    Confirm Password

    Enter the user password again.

    Cluster Type

    Provides three types of clusters:
    • 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. (MRS 1.8.5 or later supports hybrid clusters.)

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


    • MRS 1.8.10 supports the following components:
      Components of an analysis cluster:
      • Presto 0.215: open source and distributed SQL query engine (Supported in MRS 1.8.5 or later)
      • Hadoop 2.8.3: distributed system architecture
      • Spark 2.2.1: in-memory distributed computing framework
      • HBase 1.3.1: distributed column store database
      • Hive 1.2.1: data warehouse framework built on Hadoop
      • OpenTSDB 2.3.0: a distributed, scalable time series database that can store and serve massive amounts of time series data without losing granularity (supported in MRS 1.8.7 and versions later than MRS 2.0.3)
      • Hue 3.11.0: providing the Hadoop UI capability, which enables users to analyze and process Hadoop cluster data on browsers
      • Loader 2.0.0: 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 services.

      • Flink 1.7.0: a framework and distributed processing engine for stateful computations over unbounded and bounded data streams. (supported in MRS 1.8.7 and versions later than MRS 2.0.3)
      Components of a streaming cluster:
      • Kafka 1.1.0: distributed message subscription system
      • KafkaManager provides a Kafka cluster monitoring management tool. (Supported in MRS 1.8.5 or later)
      • Storm 1.2.1: distributed real-time computing system
      • Flume 1.6.0: distributed, reliable, and available service for efficiently collecting, aggregating, and moving large amounts of log data.


    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 to enter the VPC and view the name and ID of the subnet.

    If no subnet is created under the VPC, click 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 an MRS 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.


    After binding an EIP to an MRS cluster, you can use the EIP to access the MRS Manager page 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 page to purchase one.


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

    Cluster HA

    Cluster HA specifies whether to enable high availability for a cluster. This parameter is enabled by default.

    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.

    You can click or to disable or enable high availability, respectively.

    Table 2 Cluster node information




    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 number of clusters does not change much but the clusters' 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.

    Disk LVM

    This parameter is valid in the Operation column of a streaming Core node only when the streaming Core node is created. Click this parameter to enable or disable the disk LVM function. The function status is displayed in the parentheses next to this parameter.

    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.

    (Optional) Add Pay-per-use Task Node

    Click Add Pay-per-use Task Node to configure the information about the Task node.

    Click Auto Scaling in the Operation column of the Task node. On the Auto Scaling page that is displayed, configure auto scaling rules. For details, see Using Auto Scaling in a Cluster.

    • The Auto Scaling parameter in the Operation column of the Task node is used to configure an auto scaling rule. The content in the parentheses next to this parameter indicates the default node range when the auto scaling is enabled or is Disabled when auto scaling is disabled.
    • The price calculator only calculates the price of basic configurations. When Instance Count is set to 0 for Task nodes, the price calculator does not calculate the fee of the Task nodes regardless of whether the number of nodes for auto scaling is configured. The Task nodes added by using the auto scaling function are charged based on the actual usage duration.

    Instance Specifications

    Instance specifications of a node. MRS supports host specifications determined by CPU, memory, and disk space.

    MRS supports instance specifications detailed in ECS Specifications Used by MRS.

    • More advanced instance specifications provide better data processing.
    • If you select HDDs for Core nodes, there is no charging information for data disks. The fees are charged with ECSs.
    • If you select HDDs for Core nodes, the system disks (40 GB) of Master nodes and Core nodes, as well as the data disks (200 GB) of Master nodes, are SATA disks.
    • 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.

    Instance Count

    Number of Master, Core, and Task 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.

    The minimum number of Core nodes is 1 and the total number of Core and Task nodes cannot exceed 500.

    • If more than 500 Core nodes and Task nodes are required, contact technical support engineers or invoke a background interface to modify the database.
    • 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.

    Data Disk

    Disk space of Core nodes

    Users can add disks to increase storage capacity when creating a cluster. There are two different configurations for storage and computing:

    • Data storage and computing are performed separately

      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 performed together

      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.

    The following disk types are supported:

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

    The disk sizes range from 100 GB to 32,000 GB, with 10 GB added each time, for example, 100 GB, 110 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.
    • The Master node increases data disk storage space for MRS Manager. The disk type must be the same as the data disk type of Core nodes. The default disk space is 200 GB and cannot be changed.

    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.

    Keys used by encrypted data disks are provided by KMS of DEW, secure and convenient. Therefore, you do not need to establish and maintain the key management infrastructure.

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

    Data Disk 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.

    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.

    Data Disk 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.

    Table 3 Login information



    Login Mode

    • Password

      You can log in to ECS nodes using a password.

      A password must meet the following requirements:

      1. Must be 8 to 26 characters long.
      2. Must contain at least 3 of the following character types: uppercase letters, lowercase letters, digits, and special characters (!@$%^-_=+[{}]:\,./?), but must not contain spaces.
      3. Cannot be the username or the username spelled backwards.
    • Key Pair

    Keys are used to log in to Master1 of the cluster.

    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.

    Select the key pair, for example SSHkey-bba1.pem, from the drop-down list. If you have obtained the private key file, select I acknowledge that I have obtained private key file SSHkey-bba1.pem and that without this file I will not be able to log in to my ECS. If no key pair is created, click View Key Pair to create or import keys. Then obtain the private key file.

    Configure an SSH key using either of the following two methods:

    1. Create 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. Import 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.

    Table 4 Configuring required duration



    Required Duration

    Cluster required duration when the billing mode is Yearly/Monthly. The required duration ranges from one month to one year.

    Table 5 Advanced settings




    After you click Configure, the page for adding a job, a tag or a bootstrap action is displayed.


    You can set parameters later.

  4. Click Next.
  5. Confirm cluster specifications. If you select the Yearly/Monthly billing mode, click Submit Order. If you select the Pay-per-use billing mode, click Submit to submit a cluster creation task.
  6. Click Back to Cluster List to view the cluster status.

    For details about cluster status during cluster creation, see the Status parameter description in Table 1.

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

    Users can create a maximum of 10 clusters at a time and manage a maximum of 100 clusters on the MRS management console.

    The name of a new cluster can be the same as that of a failed or terminated cluster.

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