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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5316) Unload old JDBC drivers when done with them in the upgrade tests
Date Mon, 11 Jul 2011 19:40:00 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13063489#comment-13063489
] 

Knut Anders Hatlen commented on DERBY-5316:
-------------------------------------------

We don't actually call deregisterDriver() on the versions that already deregister the driver
as part of the shutdown, since DriverManager.getDrivers() will return an empty Enumeration
for those versions. But you were perhaps thinking that we should skip the entire process of
checking whether there are any drivers registered? Or perhaps have an assert to verify that
the driver in fact has been deregistered?

> Unload old JDBC drivers when done with them in the upgrade tests
> ----------------------------------------------------------------
>
>                 Key: DERBY-5316
>                 URL: https://issues.apache.org/jira/browse/DERBY-5316
>             Project: Derby
>          Issue Type: Improvement
>          Components: Test
>            Reporter: Knut Anders Hatlen
>            Assignee: Knut Anders Hatlen
>         Attachments: clear-threadlocal.diff, deregister-v2.diff, deregister.diff
>
>
> Discussed in this thread on derby-dev: http://mail-archives.apache.org/mod_mbox/db-derby-dev/201107.mbox/%3C4E146309.3000906@gmail.com%3E
> After we're done testing an old version in the upgrade tests, its classes are still loaded
in the JVM because the old driver is referenced in DriverManager. We should find a way to
unload the old drivers so that the memory usage of the upgrade tests is reduced. Now we typically
need to run with -XX:MaxPermSize=200M or similar options to work around this issue.

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