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https://issues.jboss.org/browse/JBJCA-1244?page=com.atlassian.jira.plugin...
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Tom Jenkinson commented on JBJCA-1244:
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Further information that is pertinent to the effect of this defect is if we consider the
following pseudo code test case:
1. xar.start(xid)
2. conn.insert(foo)
3. xar.end(xid)
4. xar.commit(xid, true)
If a communication failure pre-commit or post-commit on the remote resource manager occurs
then LocalXAResourceImpl will return RBROLLBACK which contravenes XA. It should return
RMFAIL here.
If RBROLLBACK is returned this must evaluate to true but in the case of a comms issue on
the return of the call then it would fail:
assertTrue(conn2.query(foo == null))
In more concrete terms this results in a critical defect on the CMR functionality of EAP
as the error code of the XAR is used to dictate the remaining XAResources. Although it is
accepted that RMFAIL if the commit failed in comms precommit would result in the rest of
the XAR committing even though the CMR did not, this is a known effect of XA and JTA and
the recovery manager is designed to detect this scenario and alert the user to the now
determined heuristic outcome of the transaction.
LocalXAResourceImpl returns RBROLLBACK in certain scenarios which
violate the XA specification
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Key: JBJCA-1244
URL:
https://issues.jboss.org/browse/JBJCA-1244
Project: IronJacamar
Issue Type: Bug
Affects Versions: 1.0.30.Final
Reporter: Tom Jenkinson
Assignee: Jesper Pedersen
The XA specification states the following about the RBROLLBACK error code for
xa_commit():
{quote}
[XA_RB∗]
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:
[XA_RBROLLBACK]
The resource manager rolled back the transaction branch for an unspecified reason
{quote}
It is clear that the RBROLLBACK code may only be returned if the branch is known to have
rolled back (and indeed if the onePhase flag is set to true).
To cater for scenarios where the XAResource is not able to determine the outcome of the
resource managers commit. In those scenarios the XA specification is clear that the only
legal error code to return is:
{quote}
[XAER_RMFAIL]
An error occurred that makes the resource manager unavailable.
{quote}
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