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https://reviews.apache.org/r/74245/
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Review request for ranger, Don Bosco Durai, Abhay Kulkarni, Madhan Neethiraj, 
Mehul Parikh, Nikhil P, Pradeep Agrawal, Ramesh Mani, Selvamohan Neethiraj, 
Sailaja Polavarapu, Subhrat Chaudhary, and Velmurugan Periasamy.


Bugs: RANGER-3899
    https://issues.apache.org/jira/browse/RANGER-3899


Repository: ranger


Description
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Analysis is when policy has 500 users with 5 policy items.

we perform total 526 DB read calls and 504 DB write, 3 DB Batch write calls. 
This is the reason for policy creation time where 1000 plus DB calls are done 
sequentially.
Time is taken to create the policy :4~8 seconds 


After Fix :After changing to batch create of XXPolicyRefUser  instead of 
calling 1 DB write XXPolicyRefUser for every user of the policy:

When Policy contains 500 users,5 access Types (permissions),12 resources 
(1DB,1Table,10 columns)

we perform total 526 DB read calls and 6 DB write calls, 5 DB Batch write calls.

Time is taken to create the policy :2.6~4 seconds


Diffs
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  security-admin/src/main/java/org/apache/ranger/biz/PolicyRefUpdater.java 
6cc3509d8 


Diff: https://reviews.apache.org/r/74245/diff/1/


Testing
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Thanks,

Ramachandran Krishnan

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