Creating a Sub-tenant

Scenario

You can create a sub-tenant on MRS 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 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%.
You have synchronized IAM users. (On the Dashboard page, click Synchronize on the right side of IAM User Sync to synchronize IAM users.)

Procedure

On the MRS details page, click Tenants.

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 which takes MRS 3.x versions as an example.

**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-leaf. If 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.
Compute Resource	Specifies the dynamic computing resources for the current tenant. The system automatically creates a task queue named after the sub-tenant name in the Yarn parent queue. If Yarn is not selected, the system does not automatically create a task queue. If the parent tenant does not have compute resources, the sub-tenant cannot use compute resources.
Configuration Mode	If Yarn is selected for Compute Resource, this parameter can be set to Basic or Advanced. Basic: Configure the percentage of compute resources used by the tenant in the default resource pool by specifying Default Resource Pool Capacity (%). Advanced: Configure the following parameters for advanced settings: Weight: Tenant resource weight. The value ranges from 0 to 100. Tenant resource weight = Tenant weight/Total weight of tenants at the same level Minimum Resources: resources preempted by the tenant. The value is a percentage or absolute value of the parent tenant's resources. When a tenant's workload is light, their resources are automatically lent to other tenants. When available resources are fewer than Minimum Resources, the tenant can preempt the resources that were lent out. Maximum Resources: maximum resources that can be used by a tenant. The value is a percentage or absolute value of the parent tenant's resources. Reserved Resources: resources reserved for the tenant. The value is a percentage or absolute value of the parent tenant's resources.
Default Resource Pool Capacity (%)	Specifies the percentage of the resources used by the current tenant. The base value is the total resources of the parent tenant. This parameter is required when Configuration Mode is Basic.
Storage Resource	Specifies storage resources for the current tenant. The system automatically creates a file in the HDFS parent tenant directory. The file is named the same as the name of the sub-tenant. If storage resources are not HDFS, the system does not create a storage directory under the root directory of HDFS. If the parent tenant does not have storage resources, the sub-tenant cannot use storage resources.
Maximum Number of Files/Directories	Maximum number of files or directories that can be created in HDFS.
Storage Space Quota	Specifies the quota for HDFS storage space used by the current tenant. The minimum value is 1, and the maximum value is the total storage quota of the parent tenant. The unit is MB or GB. This parameter indicates the maximum HDFS storage space that can be used by a 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 the quota is greater than the quota of the parent tenant, the actual storage capacity is subject to the quota of the parent tenant. NOTE: To ensure data reliability, one backup is automatically generated for each file saved in HDFS, that is, two copies are generated in total. The HDFS storage space indicates the total disk space occupied by all these copies. For example, if the value is set to 500 MB, the actual space for storing files is about 250 MB (500/2 = 250).
Storage Path	Specifies the tenant's HDFS storage directory. The system automatically creates a file folder named after the sub-tenant name in the directory of the parent tenant by default. 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. 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.

Click OK to save the settings.

It takes a few minutes to save the settings. If the Tenant created successfully is displayed in the upper-right corner, the tenant is added successfully. The tenant is created successfully.
- Roles, computing resources, and storage resources are automatically created when tenants are created.
- The new role has permissions on the computing and storage resources. The role and its permissions 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.