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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 Fri, 08 Jul 2011 13:20:16 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13061950#comment-13061950
] 

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

Not sure about 10.0.x and 10.1.x, but  DERBY-4895 could be why the classes are not unloaded
in 10.5.x and 10.6.x. It matches the affected version numbers, and some of the classes that
can't be unloaded seem to have a ThreadLocal as their gc root.

> 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
>         Attachments: 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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