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https://issues.apache.org/jira/browse/JCR-2950?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13292806#comment-13292806
]
Julian Reschke commented on JCR-2950:
-------------------------------------
It appears that a large percentage of requests are actually for the root node.
Maybe it would be worthwhile to optimize that case (making it non-blocking)?
> 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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