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From "angela (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (JCR-2950) CachingEntryCollector ineffective if number of accessed policies exceeds cache size
Date Thu, 28 Apr 2011 09:38:03 GMT

     [ https://issues.apache.org/jira/browse/JCR-2950?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

angela updated JCR-2950:
------------------------

    Summary: CachingEntryCollector ineffective if number of accessed policies exceeds cache
size  (was: Performance bottleneck: cache of CachingEntryCollector ineffective in case many
ACEs are present)

> 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: 2.2.4
>         Environment: Repository with ACEs > 1000
>            Reporter: Honwai Wong
>            Assignee: angela
>
> 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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