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From "Brian Topping (JIRA)" <j...@apache.org>
Subject [jira] [Created] (JCR-2927) Shutdown of JCR with o.a.j.c.persistence.pool.DerbyPersistenceManager leaves embedded Derby running
Date Wed, 23 Mar 2011 07:04:05 GMT
Shutdown of JCR with o.a.j.c.persistence.pool.DerbyPersistenceManager leaves embedded Derby

                 Key: JCR-2927
                 URL: https://issues.apache.org/jira/browse/JCR-2927
             Project: Jackrabbit Content Repository
          Issue Type: Bug
          Components: jackrabbit-core
    Affects Versions: 2.2.4
         Environment: JDK 1.6
            Reporter: Brian Topping

Using org.apache.jackrabbit.core.persistence.pool.DerbyPersistenceManager will cause embedded
Derby to be started properly but not completely shut down.  This is most easily seen looking
at a thread dump after the repositories have been shut down, there will be a thread created
by Derby called "derby.antiGC" still running.  This is critical under a webserver like Tomcat
(all versions including 7) to not leak a lot of memory when a context is reloaded.

The information I found to solve the issue is in http://objectmix.com/apache/647660-derby-causes-permgen-leaks-tomcat.html#post2290996.

At shutdown, org.apache.jackrabbit.core.util.db.DerbyConnectionHelper has it's shutDown()
method called, but that only shuts down individual workspaces, for instance with a URL of
"jdbc:derby:leakDB;shutdown=true".  The embedded database is still left running. 

To shutdown the database service itself, "jdbc:derby:;shutdown=true" must be used (note the
missing database).

I'm not at all confident I understand the shutdown process well enough to craft a patch that
would be worth evaluation.  On the other hand, I have hacked together a skanky proof-of-concept
that caches the DataSource for a known workspace before repository shutdown, then closes the
database itself with the noted URL.  It works, and in turn all the threads and memory with
a reference of the webapp classloader are released.

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