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https://reviews.apache.org/r/74039/
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Review request for ranger, bhavik patel, Dhaval Shah, Abhay Kulkarni, Madhan 
Neethiraj, Mehul Parikh, Ramesh Mani, Sailaja Polavarapu, and Velmurugan 
Periasamy.


Bugs: RANGER-3806
    https://issues.apache.org/jira/browse/RANGER-3806


Repository: ranger


Description
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**Problem Statement:** 
Ranger db table `x_group_users` has columns "added_by_id" and "upd_by_id" which 
should be filled with the id of logged-in user. Whenever group's-users mapping 
is pushed from usersync module at that time these values are considered from a 
config "ranger.xuser.createdByUserId" which is set to 1 in 
ranger-default-admin-site.xml and code as well.
If users have set ranger db table's primary key's auto-increment offset to any 
number other than 1 and have not updated the same accordingly in the config 
"ranger.xuser.createdByUserId" then request may fail due to Foreignkey 
constraint violation.

Example Case: if primary key's auto-increment start value has been set to 2 in 
db engine then first entry in table x_portal_user will have primary-key id 2. 
while if config  "ranger.xuser.createdByUserId" is set to 1 then due to non 
availablity of userID 1 when it will try to insert group-user mappinng entry in 
`x_group_users` table with value 1 for the column "added_by_id" and "upd_by_id" 
it will cause to fail the request.

**Proposed solution:** Rather directly putting the config's 
"ranger.xuser.createdByUserId" value in "added_by_id" and "upd_by_id" field of 
`x_group_users` table we can check whether user id exist in x_portal_user or 
not. if it does not exist then do not set the value received from config 
"ranger.xuser.createdByUserId" and avoid the Foreign-key Constraint Violation 
Exception.


Diffs
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  security-admin/src/main/java/org/apache/ranger/service/XGroupUserService.java 
9345e8180 


Diff: https://reviews.apache.org/r/74039/diff/1/


Testing
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With the patch issue is not reproducing when i have set the 
auto_increment_increment to 3 in mysql server env.


Thanks,

Pradeep Agrawal

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