[jbossts-issues] [JBoss JIRA] (JBTM-1866) HeuristicMixedException reported to client, although backends don't support heuristic completion

Christian von Kutzleben (JIRA) jira-events at lists.jboss.org
Wed Jul 31 07:58:26 EDT 2013

    [ https://issues.jboss.org/browse/JBTM-1866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12794161#comment-12794161 ] 

Christian von Kutzleben commented on JBTM-1866:

see my comments on JBTM-1865; also I will change the error code and get back to this ticket.

 > (please refer to the relevant specification documents to see what I mean).
Please be more specific, the spec says, heuristical completion can by done by the RM, not the TM,
and our RM does not do so.
> HeuristicMixedException reported to client, although backends don't support heuristic completion
> ------------------------------------------------------------------------------------------------
>                 Key: JBTM-1866
>                 URL: https://issues.jboss.org/browse/JBTM-1866
>             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
> this bug is related to:
> https://issues.jboss.org/browse/JBTM-1865
> While testing recovery and transaction failures we came across
> two related issues, the test scenario is almost the same, the other
> issue is filed as JBTM-1865
> Scenario: 
> 2 enlisted XAResources (one for each database used by the test),
> The prepare phase is successful.
> We crash the second 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.
> The first branch was successfully committed (as it should be spec.)
> But now things go awry:
> 1. The client receives a HeuristicMixedException, although the backend
> does not support heuristic completion at all, i.e. there should be no Heuristic* exception be thrown
> The correct behavior is, to report the transaction as success to the client, commit all other branches. All XAResources which failed during XAResource.commit() are supposed to be recovered in future.

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