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https://issues.apache.org/jira/browse/JCR-2129?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marcel Reutegger updated JCR-2129:
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Affects Version/s: (was: 2.0.0)
> Prevent data inconsistencies due to incorrect or missed merges in the
> ItemStateManagers
> ---------------------------------------------------------------------------------------
>
> Key: JCR-2129
> URL: https://issues.apache.org/jira/browse/JCR-2129
> Project: Jackrabbit Content Repository
> Issue Type: Bug
> Components: jackrabbit-core
> Affects Versions: core 1.4.5
> Reporter: Martijn Hendriks
> Assignee: Martijn Hendriks
> Priority: Critical
> Attachments: InconsistencyTest.java, JCR-2129-testcase.patch,
> JCR-2129.patch, repository.xml
>
>
> There are two places where transient state changes are merged with persisted
> state: (i) in the SessionISM.stateModified call back method (typically called
> by a saving thread after it's changes have been saved) and (ii) in the
> SharedISM.Update.begin method. Sometimes the merge strategy fails in the
> sense that corrupt data is written to database.
> How to reproduce:
> The attached test program contains steps to reproduce the issue. The
> testInconsistency1 method concurrently adds a node D to a node A and moves
> child node B of A to another place. This sometimes results in a situation in
> which node A still has a child reference to node B whereas B has another
> parent. In this situation, Jackrabbit cannot be started anymore if the search
> index is missing:
> Jun 8, 2009 2:16:23 PM
> org.apache.jackrabbit.core.query.OnWorkspaceInconsistency$1
> handleMissingChildNode
> SEVERE: Node /A (a7a29e8c-8d13-4fbd-b0ca-4f93f9c0ef42) has missing child 'B'
> (80aa13c5-1db6-4f62-b576-5e7f626d90c1)
> Jun 8, 2009 2:16:23 PM org.apache.jackrabbit.core.RepositoryImpl
> initStartupWorkspaces
> SEVERE: Failed to initialize workspace 'wm9'
> The testInconsistency2 method concurrently adds a reference property to a
> node B (the threads do exactly the same). This sometimes results in a
> situation in which the referenced node can never be removed anymore because
> there is a "ghost" reference to it which cannot be removed. (It gives a
> ReferentialIntegrityException).
> Jun 8, 2009 2:19:51 PM org.apache.jackrabbit.core.state.MLRUItemStateCache
> cache
> WARNING: overwriting cached entry bc28ff87-216d-4ccd-bd73-03e7499ab54e/{}ref
> to B
> Exception in thread "main" javax.jcr.ReferentialIntegrityException:
> 9f025634-d3e1-448e-904c-1c285f6b1bf6: the node cannot be removed because it
> is still being referenced.
> It seems the first problem (the parent-child relation) is caused by an
> incorrect merge in the NodeStateMerger class. The second problem might also
> be caused by an incorrect or missed merge, but I am not sure whether that's
> the real problem.
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