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https://issues.apache.org/jira/browse/DBCP-484?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16346724#comment-16346724
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Emanuel Freitas commented on DBCP-484:
--------------------------------------
Hello,
For some reason (JIRA could not attach the file as there was a missing token.
Please try attaching the file again.) i'm not able to atach the files.
Where is a link to dropbox:
[https://www.dropbox.com/s/g0oiz2wizmedeqs/dbcp-test.zip?dl=0]
If you run the TeskLeak you can see that if you increase the number of threads
(nthreads) you start getting some leaks. On our project I was able to fix the
issue with the code that I posted above, but for this test the problem is
something else.
For this tests I was using a PostgreSQL database.
Thanks for your help.
Kind regards,
Emanuel
> Connection leak during XATransaction in high load
> -------------------------------------------------
>
> Key: DBCP-484
> URL: https://issues.apache.org/jira/browse/DBCP-484
> Project: Commons Dbcp
> Issue Type: Bug
> Affects Versions: 2.2.0
> Reporter: Emanuel Freitas
> Priority: Major
>
> We're experiencing a connection leak in a distributed transaction when the
> system is under heavy load. We're using commons-dbcp (latest version) +
> eclipselink and narayana to perform transaction coordination.
> From time to time we can see a stacktrace reporting an abandoned connection.
> We are trying to figure out what's the root cause and we think that might be
> some issue in the commons dbcp (not sure) . More specifically, this parte of
> the code:
> ManagedConnection#updateTransactionStatus
> {code:java}
> if (transactionContext != null) {
> if (transactionContext.isActive()) {
> if (transactionContext !=
> transactionRegistry.getActiveTransactionContext()) {
> throw new SQLException("Connection can not be used while enlisted
> in another transaction");
> }
> return;
> }
> // transaction should have been cleared up by TransactionContextListener,
> but in
> // rare cases another lister could have registered which uses the
> connection before
> // our listener is called. In that rare case, trigger the transaction
> complete call now
> transactionComplete();
> }{code}
>
> If the transactionContext is different than null but the state is not
> "active" (ex: STATUS_ROLLEDBACK, STATUS_ROLLING_BACK, etc) it executes the
> transactionComplete mothod that clears the reference to a shared connection
> and after that the connection is never closed (returned to the pool).
>
> If we move the transactionComplete(); to an else,(see below), the connection
> leak does not happen.
> {code:java}
> if (transactionContext != null) {
> if (transactionContext.isActive()) {
> if (transactionContext !=
> transactionRegistry.getActiveTransactionContext()) {
> throw new SQLException("Connection can not be used while enlisted
> in another transaction");
> }
> return;
> }
> } else {
> transactionComplete();
> }{code}
>
> After this the dbcp unit tests still pass but I'm not sure about this
> changes. Can you please check?
> Thanks
>
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