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From "Alexander Klimetschek (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JCR-2232) shutdown deadlock
Date Thu, 30 Jul 2009 19:04:14 GMT

    [ https://issues.apache.org/jira/browse/JCR-2232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12737234#action_12737234

Alexander Klimetschek commented on JCR-2232:

> Is it really a viable solution to move knowledge about the repository implementation
(whether it is TransientRepository
> or RepositoryImpl) inside the client?

Certain things such as creation and shutdown of a Repository are not defined by the JCR 1.0
spec; also, the TransientRepository is the instance that is created by the client, so he definitely
has knowledge about it and its shutdown() method.

> shutdown deadlock
> -----------------
>                 Key: JCR-2232
>                 URL: https://issues.apache.org/jira/browse/JCR-2232
>             Project: Jackrabbit Content Repository
>          Issue Type: Bug
>          Components: clustering, jackrabbit-core
>    Affects Versions: 1.5.6
>         Environment: JDK 1.6.0_13, JBoss, Liferay 5.2.2, Oracle 10g 
>            Reporter: Timo Pick
>         Attachments: jboss-does-not-stop-dump.txt, repository.xml
> Enviroment: I'm using Liferay in a clustered environment with two JBoss nodes. Liferay
uses Jackrabbit to save documents and attachments. Jackrabbit uses an Oracle10g database as
filesystem, repository and workspace. (see repository.xml)
> Problem: shutting down jboss leads to a deadlock in the RepositoryImpl.shutdown() method
as it tries to acquire a ReadWriteLock. RepositoryImpl calls shutdown() which tells all the
Sessions to logout(). The callback method TransientRepository.loggedOut() is called. This
method calls RepositoryImpl.shutdown() again (!!!). This is where the deadlock occurs. The
lock can not be acquired again as it already is acquired by the first call. I have appended
the java stacktrace (see jboss-does-not-stop.txt)
> Possible Solution: prevent TransientSession.loggedOut() from calling RepositoryImpl.shutdown()

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