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https://issues.apache.org/jira/browse/RANGER-2789?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17080429#comment-17080429
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RickyMa edited comment on RANGER-2789 at 4/10/20, 11:48 AM:
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I've already uploaded the patch. By applying this patch, the response time has
decreased from 10+ minutes to 30 seconds in our production environment.
The problem of this issue is that the original code will query the database for
every one of the 1000+ users:
[https://github.com/apache/ranger/blob/master/security-admin/src/main/java/org/apache/ranger/service/XUserServiceBase.java#L84]
!image-2020-04-10-19-37-31-570.png!
The main ideas of the uploaded patch are:
# Find all users in the database at one time.
# Use HashMap as cache to store all the database info in memory.
# Just use the cache during any follow-up db operation.
was (Author: rickyma):
I've already uploaded the patch. By applying this patch, the response time has
decreased from 10+ minutes to 30 seconds in our production environment.
The problem of this issue is that the original code will query the database for
every one of the 1000+ users:
[https://github.com/apache/ranger/blob/master/security-admin/src/main/java/org/apache/ranger/service/XUserServiceBase.java#L84]
!image-2020-04-10-19-37-31-570.png!
The main ideas of the uploaded patch are:
# Find all users in the database at one time.
# Use HashMap as cache to store all the database info in memory.
# Any follow-up db operation can just use the cache.
> GET API service/xusers/users turns very slow when there are more than 1000
> users
> --------------------------------------------------------------------------------
>
> Key: RANGER-2789
> URL: https://issues.apache.org/jira/browse/RANGER-2789
> Project: Ranger
> Issue Type: Bug
> Components: Ranger
> Affects Versions: 2.0.0
> Environment: hdp 2.2
> Reporter: RickyMa
> Priority: Minor
> Labels: optimization, performance, ranger, rangeradmin, slow
> Attachments: RANGER-2789.patch, image-2020-04-10-19-37-31-570.png
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> We have more than 1000 users in production environment.
> When calling API 'service/xusers/users?pageSize=1000&startIndex=0' using HTTP
> GET method, Ranger Admin takes 10+ minutes to response.
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