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From "Julian Reschke (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (JCR-2950) CachingEntryCollector ineffective if number of accessed policies exceeds cache size
Date Thu, 26 Jul 2012 16:41:35 GMT

    [ https://issues.apache.org/jira/browse/JCR-2950?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13423192#comment-13423192
] 

Julian Reschke edited comment on JCR-2950 at 7/26/12 4:40 PM:
--------------------------------------------------------------

Test results with the tests only reading *nodes*; it appears this is significantly cheaper
than reading 20% nodes and 80% properties.
                
      was (Author: reschke):
    Test results with scroot caching the root node even when not access controlled.
                  
> 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,
auth-prefilled-cache.csv, cache-empty-aces-scfixed.csv, cache-empty-aces.csv, cache-empty-aces.png,
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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