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Date: Fri, 7 Oct 2011 13:19:29 +0000 (UTC)
From: "Timothee Maret (Commented) (JIRA)" <jira@apache.org>
To: dev@jackrabbit.apache.org
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Subject: [jira] [Commented] (JCR-3031) HierarchyManager become
 unsynchronized among processes after a session.move operation
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    [ https://issues.apache.org/jira/browse/JCR-3031?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13122767#comment-13122767 ] 

Timothee Maret commented on JCR-3031:
-------------------------------------

Hi Michael, I had a closer look at this issue and while writing a unit test for demonstrating this issue, I noticed that the davex RepositoryServiceImpl is actually overriding the move operation, thus, it shouldn't be related to the comment you mentionned above.

I also wrote the test JCR-3031-TEST that basically reproduce the scenario I described in the bug description, except that the two processes are simulated as threads and ... that the test actually pass.

I am really thinking that this issue is related to a multi-process environment, any idea how I could write a more complete test ?
                
> HierarchyManager become unsynchronized among processes after a session.move operation
> -------------------------------------------------------------------------------------
>
>                 Key: JCR-3031
>                 URL: https://issues.apache.org/jira/browse/JCR-3031
>             Project: Jackrabbit Content Repository
>          Issue Type: Bug
>          Components: jackrabbit-jcr2spi, jackrabbit-spi2dav
>    Affects Versions: 2.2.5
>         Environment: Two machines M1, M2
> M1: OS X 10.6.6
> M2: WIN7 (as a VirtualBox machine)
> On both machines
> JRE 1.6
>            Reporter: Timothee Maret
>         Attachments: JCR-3031-TEST.patch
>
>
> Setup
> --------
> Two machines (M1, M2) ; M1 is running a process P1 and M2 is running the process P2
> P1 and P2 create one single repository instance (through Spi2davexRepositoryServiceFactory) and reuse it to open/close multiple sessions.
> Use case
> ------------
> In P1
> 1. Create the following content
> /test
> /test/sub
> /test/file.txt
> 2. create a new session
> 3. Use (session.move()) in order to move the node /test/file.txt to /test/sub/file.txt
> 4. save the changes (session.save())
> 5. Close the session
> In P2 
> 1. Create a new session
> 2. Get the moved node (Node n = session.getNode(/test/sub/file.txt)) -> works fine
> 3. Get a property on the node (n.getProperty("jcr:content/jcr:lastModified")) -> throws a PathNotFoundException, eventhough the property exists in the repository (can be checked with an third process creating a new repository instance)
> 4. Close the session
> Notes:
> * No Parallelism, P2 is run right after P1's step 5.
> * The PathNotFoundException is always thrown in P2.
> * On P2, Refreshing the session after the step 2. does not help.
> * The cache behavior is the default one, not CacheBehaviour.OBSERVATION
> Observations
> ------------
> In P2, the PathNotFound Exception is thrown in 
> HierarchyManagerImpl.getPropertyEntry(Path qPath)
> getDeepPropertyEntry(qPath)
> // no valid ancestor node entry
> // -> if cnes are complete -> assume that it doesn't exist.
> //    refresh will bring up new entries added in the mean time
> //    on the persistent layer.
> if (entry.childNodeEntries.isComplete()) {
>     throw new PathNotFoundException(factory.saveGetJCRPath(path));		// HERE THROWS AN EXCEPTION (SEE DETAIL BELOW)
> }
> The try.childNodeEntries.isComplete() returns true when it should not. More in detail, the isComplete method gives:
> public boolean isComplete() {                       // HERE: complete = true, parent.status = EXISTING
> return (parent.getStatus() != Status.INVALIDATED && complete) ||
>        parent.getStatus() == Status.NEW ||
>        Status.isTerminal(parent.getStatus());
>     }
> }
> The parent.getStatus == EXISTING and I guess it should be invalidated due to the move operation.
> Anyway, it seems that the HierarchyManager get messed up
> Workaround
> ----------
> In P2, (step 1.) Get the session from a new Repository instance instead of reusing it.
> Note
> ----
> I'll add a test case to demo it later.

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