[jira] [Assigned] (RANGER-3900) Roles deletion Takes time in Apache Ranger when there are more users

["Ramachandran (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/RANGER-3900?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ramachandran reassigned RANGER-3900:
------------------------------------

    Assignee: Ramachandran

> Roles deletion Takes time in Apache Ranger when there are more users
> --------------------------------------------------------------------
>
>                 Key: RANGER-3900
>                 URL: https://issues.apache.org/jira/browse/RANGER-3900
>             Project: Ranger
>          Issue Type: Improvement
>          Components: Ranger
>    Affects Versions: 3.0.0
>            Reporter: Ramachandran
>            Assignee: Ramachandran
>            Priority: Major
>
> *{color:#0000ff}Role Deletion Steps in Apache Ranger:{color}*{color:#0000ff} {color}
>  
> {code:java}
>  
> 1. Getting XXRole by roleName:
> XXRole xxRole = daoMgr.getXXRole().findByRoleName(roleName); → 1DB Read call
> 2. Ensuring role is not in policy 
> Long roleRefPolicyCount = daoMgr.getXXPolicyRefRole().findRoleRefPolicyCount(roleName); → 1DB Read call
> 3. Ensuring role is not in another role
> Long roleRefRoleCount = daoMgr.getXXRoleRefRole().findRoleRefRoleCount(roleName);→ 1DB Read call
> 4. Fetching RangerRole by id
> RangerRole role = roleService.read(xxRole.getId()); → 1DB Read call
> 5. Dereferencing all the users from the role.
>  for (XXRoleRefUser xxRoleRefUser : xRoleUserDao.findByRoleId(roleId)) { → 1DB Read call
> xRoleUserDao.remove(xxRoleRefUser);   → 1DB Write call for each xxRoleRefUser
> }
> 6. Dereferencing all the groups from the role
> for (XXRoleRefGroup xxRoleRefGroup : xRoleGroupDao.findByRoleId(roleId)) { → 1DB Read call
> xRoleGroupDao.remove(xxRoleRefGroup);  → 1DB Write call for each xxRoleRefGroup
> }
> 7. Dereferencing all other roles from the role.
> for (XXRoleRefRole xxRoleRefRole : xRoleRoleDao.findByRoleId(roleId)) {→ 1DB Read call
> xRoleRoleDao.remove(xxRoleRefRole);→ 1DB Write call for each xxRoleRefRole
> }
> 8. Delete the rangerRole in DB
>   roleService.delete(role);  → 1DB Write call
> 9. Create TrxLog
> bizUtil.createTrxLog(trxLogList) → 1DB Write call
>  
> {code}
>  
> *{color:#0000ff}Total number of DB calls involved for the below role deletion in Apache Ranger:{color}*
>  
> *Deleting the role which contains more users:*
> 1. role contains 100 users 
> ||DB Write count||DB Read count||DB Batch Write count||Time is taken to delete the role||
> |102|6|0|1.01 seconds|
>  
> 1 role contains 500 users  
> ||DB Write count||DB Read count||DB Batch Write count||Time is taken to delete the role||
> |502|6|0| 2.241 seconds|
> 1 role contains 1000 users  
> ||DB Write count||DB Read count||DB Batch Write count||Time is taken to delete the role||
> |1002|6|0|3.14 seconds|
>  
> *Deleting the user (Which was associated with the role . Now that role got deleted)*
>  
> ||Number of users ||Time is taken to delete each user||
> |1000| 0.8 to 1.5  seconds|
>  
> *Deleting the user (Which was not associated with any role)*
> ||Number of users ||Time is taken to delete each user||
> |1000| 0.8 to 1.2  seconds|
> {color:#FF0000}Recommendation :{color}
> When we reduce the number of users added to the role -→ Total number of DB calls will be reduced 
> Instead of adding roles to the users, can we add those users into the group. And then link that group to the role
> if we use groups instead of directly adding users into the role, the total number of DB write call will be reduced to 2 from 1002  for 1k users 
>  
> {color:#ff0000}Proposal{color}:
> {color:#ff0000}We can try DB batch write call instead of 1 DB write call for every user deference {color}
>  



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