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From "Marcel Reutegger (JIRA)" <j...@apache.org>
Subject [jira] [Created] (JCR-3617) Inconsistent CachingHierarchyManager under concurrent access
Date Tue, 02 Jul 2013 07:46:22 GMT
Marcel Reutegger created JCR-3617:
-------------------------------------

             Summary: Inconsistent CachingHierarchyManager under concurrent access
                 Key: JCR-3617
                 URL: https://issues.apache.org/jira/browse/JCR-3617
             Project: Jackrabbit Content Repository
          Issue Type: Bug
          Components: jackrabbit-core
    Affects Versions: 2.6, 2.4, 2.2
            Reporter: Marcel Reutegger
            Assignee: Marcel Reutegger
            Priority: Minor


This is a bit difficult to reproduce and so far I'm not able to provide a standalone test
case for this issue. However, the following happens on the application level: a sub-tree is
replaced with a modified version of the sub-tree while event listeners track those changes
and try to get items for the given event paths. In some cases the repository throws an exception
when Session.getItem() is called similar to what was reported in JCR-3368.

It is important to note that the replaced subtree has some special characteristics. The root
node of the sub-tree is re-created with the same UUID, while descendant nodes may be replaced
with different UUIDs, but still have the same name.

There seems to be a short time window where the modifying Session saves this kind of change,
which gets propagated up to the ItemState layers and into the CachingHierarchyManager and
the listening Session (owning the CachingHierarchyManager) access modified items at the same
time through the CachingHierarchyManager. In some cases this seems to create an inconsistent
state in the CachingHierarchyManager where a path is mapped to the old UUID (and vice versa)
even though the replace already happened.

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