• MapReduce Service

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  2. MapReduce Service
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  4. MRS Manager Operation Guide
  5. Tenant Management
  6. Creating a Sub-tenant

Creating a Sub-tenant

Scenario

You can create a sub-tenant on MRS Manager if the resources of the current tenant need to be further allocated.

Prerequisites

  • A parent tenant has been added.
  • A tenant name has been planned. The name must not be the same as that of a role or Yarn queue that exists in the current cluster.
  • If a sub-tenant requires storage resources, a storage directory has been planned in advance based on service requirements, and the planned directory does not exist under the storage directory of the parent tenant.
  • The resources that can be allocated to the current tenant have been planned and the sum of the resource percentages of direct sub-tenants under the parent tenant at every level does not exceed 100%.

Procedure

  1. On MRS Manager, click Tenant.
  2. In the tenant list on the left, move the cursor to the tenant node to which a sub-tenant is to be added. Click Create sub-tenant. On the displayed page, configure the sub-tenant attributes according to the following table.

    Table 1 Sub-tenant parameters

    Parameter

    Description

    Parent tenant

    Specifies the name of the parent tenant.

    Name

    Specifies the name of the current tenant. The value consists of 3 to 20 characters, and can contain letters, digits, and underscores (_).

    Tenant Type

    The options include Leaf and Non-leafIf Leaf is selected, the current tenant is a leaf tenant and no sub-tenant can be added. If Non-leaf is selected, sub-tenants can be added to the current tenant.

    Dynamic Resource

    Specifies the dynamic computing resources for the current tenant. The system automatically creates a task queue in the Yarn parent tenant queue and the task queue name is the same as the name of the sub-tenant. If dynamic resources are not Yarn resources, the system does not automatically create a task queue. If the parent tenant does not have dynamic resources, the sub-tenant cannot use dynamic resources.

    Default Resource Pool Capacity (%)

    Specifies the percentage of the computing resources used by the current tenant. The base value is the total resources of the parent tenant.

    Default Resource Pool Max. Capacity (%)

    Specifies the maximum percentage of the computing resources used by the current tenant. The base value is the total resources of the parent tenant.

    Storage Resource

    Specifies the storage resources for the current tenant. The system automatically creates a file folder in the HDFS parent tenant directory, which is given the same name as the sub-tenant. If storage resources are not HDFS, the system does not create a storage directory under the HDFS directory. If the parent tenant does not have storage resources, the sub-tenant cannot use storage resources.

    Space Quota (MB)

    Specifies the quota for HDFS storage space used by the current tenant. The minimum value is 1. The maximum value is the entire space quota of the parent tenant. The unit is MB. This parameter indicates the maximum HDFS storage space that can be used by the tenant, but does not indicate the actual space used. If the value is greater than the size of the HDFS physical disk, the maximum space available is the full space of the HDFS physical disk. If this quota is greater than the quota of the parent tenant, the actual storage space will be affected by the quota of the parent tenant.

    NOTE:

    To ensure data reliability, two more copies of a file are automatically generated when the file is stored in HDFS. That is, three copies of the same file are stored by default. The HDFS storage space indicates the total disk space occupied by all these copies. For example, if Space Quota is set to 500, the actual space for storing files is about 166 MB (500/3 = 166).

    Storage Path

    Specifies the tenant's HDFS storage directory. The system automatically creates a file folder in the parent tenant directory, which is given the same name as the sub-tenant. For example, if the sub-tenant is ta1s and the parent directory is tenant/ta1, the system sets this parameter for the sub-tenant to tenant/ta1/ta1s by default. The storage path is customizable in the parent directory. The parent directory for the storage path must be the storage directory of the parent tenant.

    Service

    Specifies other service resources associated with the current tenant. HBase is supported. To configure this parameter, click Associate Services. In the dialog box that is displayed, set Service to HBase. If Association Mode is set to Exclusive, service resources are occupied exclusively. If Share is selected, service resources are shared.

    Description

    Specifies the description of the current tenant.

  3. Click OK to save the settings.

    It takes a few minutes to save the settings.The Tenant created successfully is displayed in the upper-right corner. The tenant is added successfully.

    NOTE:
    • Roles, computing resources, and storage resources are automatically created when tenants are created.
    • The new role has the rights on the computing and storage resources. The role and the rights are controlled by the system automatically and cannot be controlled manually under Manage Role.
    • When using this tenant, create a system user and assign the user a related tenant role. For details, see Creating a User.