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From Claus Köll (JIRA) <j...@apache.org>
Subject [jira] Created: (JCR-2861) Internal Timeout Handling in the TransactionContext is not XA Spec. conform
Date Mon, 10 Jan 2011 12:04:47 GMT
Internal Timeout Handling in the TransactionContext is not XA Spec. conform
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                 Key: JCR-2861
                 URL: https://issues.apache.org/jira/browse/JCR-2861
             Project: Jackrabbit Content Repository
          Issue Type: Improvement
          Components: jackrabbit-core
    Affects Versions: 2.2.0
            Reporter: Claus Köll
            Assignee: Claus Köll
            Priority: Critical


The problem here is that in a 2 phase transaction the xa spec does not  
permit a RB* return code in response to xa_commit().  The xa spec says  
the following about RB* return codes in the xa_commit() section:        
                                                                        
"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.  These values may
be returned only if TMONEPHASE is set in flags"                         
                                                                        
Essentially, the only two return codes from xa_commit that J2EE Containers can     
handle sensibly are XA_OK (normal case) and XA_RMFAIL.  RMFAIL will     
cause the containers to retry to commit the  transaction.  Any other return code will result
in a heuristic          
transaction outcome (non-atomic).  

In a xa environment the TMONEPHASE is not set on the flags and so XA_RBTIMEOUT is 
not a permitted return code. A Container  transaction service cannot do anything to ensure
an atomic     
outcome if an XAResource fails to honour its promise to be able to commit it made when it
answer XA_OK in response to xa_prepare(). 

The internal timeout handling will rollback the Jackrabbit XAResource if the time exceeds
between prepare and commit.
and in the commit Method will always throw a XA_RBTIMEOUT.

We should not handle the timeout internal because this should make the container in a 2 Phase
transaction.

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