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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-6440) Connections opened by ForeignTableVTI never get released
Date Mon, 23 Dec 2013 18:30:01 GMT

    [ https://issues.apache.org/jira/browse/DERBY-6440?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13855826#comment-13855826
] 

Knut Anders Hatlen commented on DERBY-6440:
-------------------------------------------

(The reason why I looked for memory leaks in the first place, was the OutOfMemoryErrors that
we've seen every now and then in the nightly testing on JDK 8 lately (for example [here|http://download.java.net/javadesktop/derby/request_5585930/javadb-task-3780475.html]).
I don't know if this bug is what's causing those OOMEs, though.)

> 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: 10.11.0.0
>            Reporter: Knut Anders Hatlen
>
> 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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