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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3319) Logical connections do not check if a transaction is active on close
Date Wed, 02 Apr 2008 22:50:24 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3319?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12584874#action_12584874

Kristian Waagan commented on DERBY-3319:

I would think points 1 is incorrect behavior. If that one is fixed, I think point 3 might
be okay.

Points 2 and 4 are good. I believe it is required to be able to support "connection stealing",
i.e. when a connection pool implementation executes a sequence like this:
PooledConnection pc = ...
Connection lc1 = pc.getConnection()
// Give lc1 to a user/client.
// Then wait, and determine that the user having lc1 has crashed / timed out / misbehaved.
// Take back control of the physical connection and give a new logical connection to another
Connection lc2 = pc.getConnection()
// lc1 will now be closed / invalidated and should not contain any reference to the pooled
/ physical connection.

We should not throw an exception in this case. Also note that the reference to the PooledConnection
will normally not be available to end-users.
I logged this issue to get point 1 fixed.

> Logical connections do not check if a transaction is active on close
> --------------------------------------------------------------------
>                 Key: DERBY-3319
>                 URL: https://issues.apache.org/jira/browse/DERBY-3319
>             Project: Derby
>          Issue Type: Bug
>          Components: JDBC, Network Client
>    Affects Versions:,,
>         Environment: Embedded driver and client driver.
>            Reporter: Kristian Waagan
>         Attachments: LogicalConnectionCloseActiveTransactionBug.java
> If you call close on a logical connection, for instance as obtained through a PooledConnection,
it does not check if there is an active transaction.
> The close of the logical connection is allowed, and even the close of the parent PooledConnection
is allowed in the client driver. This can/will cause resources to be left on the server, and
later operations might fail (typically with lock timeouts because the "closed" transaction
is still holding locks).
> I do not know if gc will solve this eventually, but I would say the current behavior
of the client driver is wrong in any case.
> There is difference in the behavior between the embedded and the client driver, and there
also seems to be a bug in the embedded driver.
> The analysis above is a bit sketchy, so it might be required to look into the issue a
bit more...
> I will attach a repro (JDBC usage should be verified as well, is it legal / as intended?)

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