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From "Rick Hillegas (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (DERBY-6440) Connections opened by ForeignTableVTI never get released
Date Fri, 30 May 2014 14:53:02 GMT

     [ https://issues.apache.org/jira/browse/DERBY-6440?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Rick Hillegas resolved DERBY-6440.

    Resolution: Fixed

Resolving this issue. There is a remaining issue raised by Knut: Should something be done
to explicitly close the connection when it is removed from the HashMap. If the external connection
is a connection to another Derby database, then I would expect that its resources would be
released when the no-longer referenced connection is garbage collected. Behavior for other
databases may vary but I would expect garbage collection would clean up resources for connections
to other databases too. If someone is not satisfied with this response, feel free to open
a follow-on issue.

> Connections opened by ForeignTableVTI never get released
> --------------------------------------------------------
>                 Key: DERBY-6440
>                 URL: https://issues.apache.org/jira/browse/DERBY-6440
>             Project: Derby
>          Issue Type: Bug
>          Components: Tools
>    Affects Versions:
>            Reporter: Knut Anders Hatlen
>            Assignee: Rick Hillegas
>         Attachments: derby-6440-01-aa-dropConnectionOnUnload.diff
> I noticed during a run of suites.All that one database instance never got garbage collected,
even after it had been shut down. It turned out it could not get garbage collected because
it was still referenced from the static HashMap _connections in ForeignTableVTI. Looking closer
at ForeignTableVTI, it looks as if it only calls put() and get() on the HashMap, never remove(),
so its memory footprint will keep increasing as it is used.
> It would be good to have some way (preferably automatic) of releasing the resources held
by ForeignTableVTI when they are no longer needed.

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