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From "Tobias Bocanegra (JIRA)" <j...@apache.org>
Subject [jira] Closed: (JCR-614) Weird locking behaviour in CachingHierarchyManager
Date Wed, 01 Nov 2006 11:58:20 GMT
     [ http://issues.apache.org/jira/browse/JCR-614?page=all ]

Tobias Bocanegra closed JCR-614.
--------------------------------

    Resolution: Fixed

fixed.
New Revision: 469853

> Weird locking behaviour in CachingHierarchyManager
> --------------------------------------------------
>
>                 Key: JCR-614
>                 URL: http://issues.apache.org/jira/browse/JCR-614
>             Project: Jackrabbit
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 1.0.1, 1.1
>            Reporter: Tobias Bocanegra
>         Assigned To: Tobias Bocanegra
>             Fix For: 1.2
>
>
> in some of our itegration tests the repository sometime locks-up with a stacktrace like
this:
> "Thread-38" daemon prio=5 tid=0x08cb3908 nid=0xdd8 runnable [9fef000..9fefd90]
>         at org.apache.jackrabbit.core.CachingHierarchyManager.removeLRU(CachingHierarchyManager.java:540)
>         - waiting to lock <0x16a9b0e0> (a java.lang.Object)
>         at org.apache.jackrabbit.core.CachingHierarchyManager.cache(CachingHierarchyManager.java:510)
>         - locked <0x16a9b0e0> (a java.lang.Object)
>         at org.apache.jackrabbit.core.CachingHierarchyManager.buildPath(CachingHierarchyManager.java:163)
>         at org.apache.jackrabbit.HierarchyManagerImpl.buildPath(HierarchyManagerImpl.java:296)
> [...]
> although i think that this sacktrace is valid (a thread holding a monitor waiting to
lock it again) this scenario shows up a lot during stress-testing. i assume it's the JIT that
messesup synchornization. 
> the fix is to remove the double monitor entry in this case.

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