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https://issues.apache.org/jira/browse/DERBY-5316?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Knut Anders Hatlen updated DERBY-5316:
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Attachment: deregister.diff
I wrote this patch to run DriverManager.deregisterDriver() in the class loader
that had loaded the driver. By instrumenting DriverManager, I've verified that
the old drivers get deregistered when we're done with them. However, I still
need to increase permgen from the default (64M) to get the upgrade tests to
complete without OOME.
Using the JVM flags Kristian mentioned, I see this trace:
$ grep EmbeddedDriver out.txt
[Loaded org.apache.derby.jdbc.EmbeddedDriver from
file:/code/derby/oldreleases/10.0.2.1/derby.jar]
[Loaded org.apache.derby.jdbc.EmbeddedDriver from
file:/code/derby/trunk/jars/sane/derby.jar]
[Loaded org.apache.derby.jdbc.EmbeddedDriver from
file:/code/derby/oldreleases/10.1.1.0/derby.jar]
[Loaded org.apache.derby.jdbc.EmbeddedDriver from
file:/code/derby/oldreleases/10.1.2.1/derby.jar]
[Loaded org.apache.derby.jdbc.EmbeddedDriver from
file:/code/derby/oldreleases/10.1.3.1/derby.jar]
[Loaded org.apache.derby.jdbc.EmbeddedDriver from
file:/code/derby/oldreleases/10.2.1.6/derby.jar]
[Loaded org.apache.derby.jdbc.EmbeddedDriver from
file:/code/derby/oldreleases/10.2.2.0/derby.jar]
[Unloading class org.apache.derby.jdbc.EmbeddedDriver]
[Loaded org.apache.derby.jdbc.EmbeddedDriver from
file:/code/derby/oldreleases/10.3.1.4/derby.jar]
[Unloading class org.apache.derby.jdbc.EmbeddedDriver]
[Loaded org.apache.derby.jdbc.EmbeddedDriver from
file:/code/derby/oldreleases/10.3.3.0/derby.jar]
[Unloading class org.apache.derby.jdbc.EmbeddedDriver]
[Loaded org.apache.derby.jdbc.EmbeddedDriver from
file:/code/derby/oldreleases/10.4.1.3/derby.jar]
[Unloading class org.apache.derby.jdbc.EmbeddedDriver]
[Loaded org.apache.derby.jdbc.EmbeddedDriver from
file:/code/derby/oldreleases/10.4.2.0/derby.jar]
[Unloading class org.apache.derby.jdbc.EmbeddedDriver]
[Loaded org.apache.derby.jdbc.EmbeddedDriver from
file:/code/derby/oldreleases/10.5.1.1/derby.jar]
[Unloading class org.apache.derby.jdbc.EmbeddedDriver]
[Loaded org.apache.derby.jdbc.EmbeddedDriver from
file:/code/derby/oldreleases/10.5.3.0/derby.jar]
[Loaded org.apache.derby.jdbc.EmbeddedDriver from
file:/code/derby/oldreleases/10.6.1.0/derby.jar]
[Loaded org.apache.derby.jdbc.EmbeddedDriver from
file:/code/derby/oldreleases/10.6.2.1/derby.jar]
[Loaded org.apache.derby.jdbc.EmbeddedDriver from
file:/code/derby/oldreleases/10.7.1.1/derby.jar]
[Loaded org.apache.derby.jdbc.EmbeddedDriver from
file:/code/derby/oldreleases/10.8.1.2/derby.jar]
[Unloading class org.apache.derby.jdbc.EmbeddedDriver]
Since it doesn't specify exactly which variant of the class that is unloaded,
I'd have to guess, but it looks to me as if 10.0.x and 10.1.x don't get
unloaded. 10.2.x, 10.3.x and 10.4.x do get unloaded. Then 10.5.x and 10.6.x
don't get unloaded. Finally 10.7.1.1 is unloaded, whereas 10.8.1.2 isn't
unloaded because the test completes so soon after the deregistration of the
driver that the JVM doesn't have time to do a gc.
> 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/%[email protected]%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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