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From "angela (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (JCR-2950) CachingEntryCollector ineffective if number of accessed policies exceeds cache size
Date Wed, 25 Jul 2012 14:34:35 GMT

    [ https://issues.apache.org/jira/browse/JCR-2950?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13422312#comment-13422312
] 

angela commented on JCR-2950:
-----------------------------

right... which brings us back to the original discussions we had years ago: we add some improvement
here and there 
but we don't address the actual issue which IMO is that we need to read a lot of items in
order to evaluate the permissions.
that might work to some extend but i think it's very limited...
                
> CachingEntryCollector ineffective if number of accessed policies exceeds cache size
> -----------------------------------------------------------------------------------
>
>                 Key: JCR-2950
>                 URL: https://issues.apache.org/jira/browse/JCR-2950
>             Project: Jackrabbit Content Repository
>          Issue Type: Improvement
>          Components: jackrabbit-core, security
>    Affects Versions: 2.2.12, 2.4.2, 2.6
>         Environment: Repository with ACEs > 1000
>            Reporter: Honwai Wong
>            Assignee: Julian Reschke
>         Attachments: CachingEntryCollector.ConcurrentCache-trunk.patch, JCR-2950-concurrent-cache-2.patch,
JCR-2950-futures.patch, JCR-2950-futures_2.patch, JCR-2950-futures_3.patch, JCR-2950-futures_4.patch,
JCR-2950-refactor+rootnode.patch, JCR-2950-refactor+rootnode_2.patch , JCR-2950-refactor+rootnode_3.patch,
JCR-2950-refactor+rootnode_4.patch, JCR-2950-refactor+rootnode_5.patch, JCR-2950-refactor+rootnode_6.patch,
JCR-2950-refactor+rootnode_7.patch, JCR-2950-refactor.patch, JCR-2950-throttle.patch, JCR-2950-throttle2.patch,
JCR-2950_entryseparation-multisessionhack.patch, JCR-2950_entryseparation.patch, JCR-2950_performance_tests.patch.gz,
jcr-2950-2.csv, jcr-2950-2.png, jcr-2950-csv.sh, jcr-2950.csv, jcr-2950.png, syssessioncomparison.csv,
test2950.sh
>
>
> The CachingEntryCollector's cache (LRUMap, max size: 1000) seems to become ineffective
in case there are more than 1000 ACEs present in the repository. Since access to the cache
is synchronized, many threads are basically blocked, waiting to get access to the cache.
> Java callstack:
> at org/apache/jackrabbit/core/security/authorization/acl/CachingEntryCollector.getEntries(CachingEntryCollector.java:99(Compiled
Code))
> at org/apache/jackrabbit/core/security/authorization/acl/EntryCollector.collectEntries(EntryCollector.java:134(Compiled
Code))
> at org/apache/jackrabbit/core/security/authorization/acl/CompiledPermissionsImpl.canRead(CompiledPermissionsImpl.java:250(Compiled
Code))
> at org/apache/jackrabbit/core/security/DefaultAccessManager.canRead(DefaultAccessManager.java:251(Compiled
Code))
> at org/apache/jackrabbit/core/ItemManager.canRead(ItemManager.java:426(Compiled Code))
> at org/apache/jackrabbit/core/ItemManager.createItemData(ItemManager.java(Compiled Code))
> at org/apache/jackrabbit/core/ItemManager.getItemData(ItemManager.java:379(Compiled Code))
> at org/apache/jackrabbit/core/ItemManager.itemExists(ItemManager.java:292(Compiled Code))
> at org/apache/jackrabbit/core/ItemManager.itemExists(ItemManager.java:464(Compiled Code))
> at org/apache/jackrabbit/core/session/SessionItemOperation$1.perform(SessionItemOperation.java:49(Compiled
Code))
> at org/apache/jackrabbit/core/session/SessionItemOperation$1.perform(SessionItemOperation.java:46(Compiled
Code))
> at org/apache/jackrabbit/core/session/SessionItemOperation.perform(SessionItemOperation.java:187(Compiled
Code))
> at org/apache/jackrabbit/core/session/SessionState.perform(SessionState.java:200(Compiled
Code))
> at org/apache/jackrabbit/core/SessionImpl.perform(SessionImpl.java:355(Compiled Code))
> at org/apache/jackrabbit/core/SessionImpl.itemExists(SessionImpl.java:751(Compiled Code))

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