Elastic MapReduce (EMR) will need to access or operate other cloud products. To ensure that sub-users or collaborators can use and operate EMR normally, this document describe how to grant sub-users or collaborators related permissions.

Permission Policy Overview

Scenarios

Authorizing EMR to access other cloud services

Tencent Cloud root accounts and sub-users and collaborators with the QcloudCamSubaccountsAuthorizeRoleFullAccess permission can access other cloud services after being authorized.

• To use EMR to access CVM, CBS, TencentDB, and other services, you need to assign the EMR_QCSRole service role and grant the QcloudAccessForEMRRole permission (for EMR to read CVM, CBS, TencentDB, COS, and other services) to the first EMR instance you purchase.
• To use EMR to access the data stored in COS, you need to assign the EMR_QCSRole service role and grant the QcloudAccessForEMRRoleInApplicationDataAccess permission (for EMR big data applications to access other data services, such as COS) to EMR.

The root account can grant the QcloudCamSubaccountsAuthorizeRoleFullAccess permission to sub-users or collaborators via the following steps:

1. Log in to the CAM console, click Users > User List, find the target sub-user or collaborator, and click Authorize.
   
2. Search for and select the QcloudCamSubaccountsAuthorizeRoleFullAccess policy, then click Confirm.
   
   You can associate the QcloudAccessForEMRRole and QcloudAccessForEMRRoleInApplicationDataAccess policies with the root account, sub-user, or collaborator. The process is the same as step 2.

Purchasing and managing EMR clusters

To create a cluster, add a component, or scale out a cluster, a sub-user or collaborator must be associated with the QcloudEMRFullAccess and QcloudCVMFinanceAccess policies and the custom TencentDB purchase policy. In cases not involving resource purchase, such as service configuration management, only the QcloudEMRFullAccess policy is required.

Note：

Only accounts with the financial permission can purchase pay-as-you-go EMR clusters.

The root account can grant the above permissions to a sub-user or collaborator via the following steps:

1. Log in to the CAM console, click Users > User List, find the target sub-user or collaborator, and click Authorize.
   
2. Search for and select each policy listed in the above table in the Associate Policy dialog box, then click Confirm. The QcloudEMRFullAccess policy is used as an example in the following figure:
   
3. Custom a TencentDB purchase policy.
   • (1). Create a custom policy.
     Log in to the CAM console, click Policies > Create Custom Policy > Create by Policy Syntax, select Blank Template on the Create by Policy Syntax page, and click Next.
     
     Enter a policy name (such as EMRvisitedCDB) and a description (such as permission to purchase TencentDB instances for new EMR components), enter the following JSON content under Policy Content, and click Done.

     
     {
         "version": "2.0",
         "statement":[
             {
                 "effect": "allow",
                 "resource": [
                     "*"
                 ],
                 "action": [
                     "cdb:CreateDBInstance",
                     "cdb:CreateDBInstanceHour"
                 ]
             }
         ]
     }
     

   • (2). Associate the sub-user or collaborator with the custom TencentDB policy.
     Find the target sub-user or collaborator on the user list in the CAM console, click Authorize in the Action column, and search for and associate the custom policy (such as EMRvisitedCDB).

Custom Service Roles

Tencent Cloud root accounts and collaborators and sub-users with the QcloudCamRoleFullAccess permission can precisely control COS bucket permissions and other cloud resource permissions. For more information see [Custom Service Roles](https://intl.cloud.tencent.com/document/ product/1026/39661).
A root account can grant the QcloudCamRoleFullAccess permission to a sub-user or collaborator via the following steps:

1. Log in to the CAM console, click Users > User List, find the target sub-user or collaborator, and click Authorize.
   
2. Search for and select the QcloudCamRoleFullAccess policy, then click Confirm.