[jbossts-issues] [JBoss JIRA] (JBTM-1865) Transaction reported to be rolled back, although committed with one participant

Mark Little (JIRA) jira-events at lists.jboss.org
Wed Jul 31 07:34:26 EDT 2013

    [ https://issues.jboss.org/browse/JBTM-1865?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12794150#comment-12794150 ] 

Mark Little commented on JBTM-1865:

You are seeing the correct behaviour. Please go and re-read the X/Open XA specification. Here's a brief piece to help understand:

The resource manager did not commit the work done on behalf of the transaction branch. Upon return, the resource manager has rolled back the branch’s work and has released all held resources.

And XA_RBCOMFAIL means: A communication failure occurred within the resource manager.

Since we know the commit has failed, we rollback the transaction. Just because an application level commit has been called on the transaction does not mean the transaction has committed.
> Transaction reported to be rolled back, although committed with one participant
> -------------------------------------------------------------------------------
>                 Key: JBTM-1865
>                 URL: https://issues.jboss.org/browse/JBTM-1865
>             Project: JBoss Transaction Manager
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: Transaction Core
>    Affects Versions: 4.17.4
>            Reporter: Christian von Kutzleben
>            Assignee: Tom Jenkinson
> While testing recovery and transaction failures we came across
> two related issues, the test scenario is almost the same, I'll file the second issue shortly and update this ticket accordingly.
> Scenario: 
> 2 enlisted XAResources (one for each database used by the test),
> The prepare phase is successful.
> We crash the first database server during the XAResource.commit invocation,
> _after_ it has committed it's branch, right before the control flow would return to the XAResource (which as a result throws a XAException.XA_RBCOMMFAIL).
> The TM can not know at this point in time, whether the database successfully committed the transaction or not. In this particular case, all changes have been committed.
> By definition of the 2PC protocol, the transaction should be considered as "to be committed", because the prepare phase has ended successfully.
> But now things go awry:
> 1. There is a XAResource.rollback() issued to the second XAResource.
> 2. The client receives a EJBTransactionRolledbackException, although
> one branch has been completed.
> Note, that our database does not support heuristical completion of a branch at all, i.e. there should be no Heuristic* exception be thrown either.
> The correct behavior is, to report the transaction as success to the client, commit all branches. All XAResources which failed during XAResource.commit() are supposed to be recovered in future.

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