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From "Tobias Bocanegra (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (OAK-1138) Implement global per principal permission entry cache
Date Fri, 01 Nov 2013 02:12:19 GMT

    [ https://issues.apache.org/jira/browse/OAK-1138?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13810960#comment-13810960
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Tobias Bocanegra edited comment on OAK-1138 at 11/1/13 2:10 AM:
----------------------------------------------------------------

of course you're right. but I always do invocation-count profiling to detect such pitfalls,
and compare the own-time vs the callee times.

however, we definitely need to look at this again. what puzzles me most, is the difference
between admin and non-admin performance. even with the cache, which does not read much from
the content anymore, once it's full, the difference is still significant.

so thinking about this again - I might be mistaken that the cache really contributes so much
to the performance improvements. I have to measure again, and profile again. the tests I did
was reading 10k items in a 120k item repository, with ACLs on every 10th node. with 1 thread
this takes 600ms per test (and before the cache changes, 800ms). but again, there might have
been other improvements in the meantime :-)


was (Author: tripod):
thinking about this again - I might be mistaken that the cache really contributes so much
to the performance improvements. I have to measure again, and profile again. the tests I did
was reading 10k items in a 120k item repository, with ACLs on every 10th node. with 1 thread
this takes 600ms per test (and before the cache changes, 800ms). but again, there might have
been other improvements in the meantime :-)

> Implement global per principal permission entry cache
> -----------------------------------------------------
>
>                 Key: OAK-1138
>                 URL: https://issues.apache.org/jira/browse/OAK-1138
>             Project: Jackrabbit Oak
>          Issue Type: Sub-task
>          Components: security
>    Affects Versions: 0.10
>            Reporter: Tobias Bocanegra
>            Assignee: Tobias Bocanegra
>            Priority: Minor
>
> In order to speedup ACL evaluation, we need some sort of cache that can hold the pre-computed
access control permission entries.



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