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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-3596) Creation of logical connections from a pooled connection causes resource leak on the server
Date Mon, 30 Jun 2008 07:47:45 GMT

     [ https://issues.apache.org/jira/browse/DERBY-3596?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Kristian Waagan updated DERBY-3596:

       Fix Version/s:
    Derby Categories: [Performance]

Updated fix version and also ticked the performance category.
Before this fix, resources would leak and garbage collection would cause severe (periodic)
performance degradation.

> Creation of logical connections from a pooled connection causes resource leak on the
> -------------------------------------------------------------------------------------------
>                 Key: DERBY-3596
>                 URL: https://issues.apache.org/jira/browse/DERBY-3596
>             Project: Derby
>          Issue Type: Bug
>          Components: Network Client, Network Server, Performance
>    Affects Versions:,,,,
>            Reporter: Kristian Waagan
>            Assignee: Kristian Waagan
>             Fix For:,
>         Attachments: complex-fix-heap.png, ConnectionPoolingBug.java, derby-3596-1a-complex_approach.diff,
derby-3596-1b-complex_approach.diff, derby-3596-2a-simple_approach.diff, derby-3596-3a-test_cleanup.diff,
derby-3596-4a-complex_check_creds.diff, derby-3596-5a-complex_skip_creds.diff, derby-3596-5a-complex_skip_creds.diff,
nofix-heap.png, simple-fix-heap.png
> When using ClientConnectionPoolDataSource and connection pooling, a new connection /
transaction is created for every new logical connection, and the resources are not freed /
cleaned up in the server. They are not even cleaned up when the physical connection (ClientPooledConnection)
is closed.
> A logical connection is obtained by invoking ClientPooledConnection.getConnection().
> I have observed that if you run the repro enough times against the same server, the number
of transaction in the transaction table will be reduced now and then. I believe this is garbage
collection, but I have not investigated the problem enough to tell for sure what's going on.
> I have also seen some locks not being freed, causing timeouts in some applications. I
don't have a repro for the lock problem at this time, but it is very likely related to this
> Note that XA connections are handled differently on the server, and do probably not have
this problem.

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