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Re: Remote txinflow: XID changes
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created by <a href="http://community.jboss.org/people/tomjenkinson">Tom Jenkinson</a> in <i>JBoss Transactions Development</i> - <a href="http://community.jboss.org/message/632535#632535">View the full discussion</a>
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<div class="jive-rendered-content"><p>Unfortunately I am sure after having several discussions with Jonathan about this (though happy to be disproved).</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>What we absolutely must be able to do is allow the recovery manager to detect orphan resources.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Typically we detect the orphan by looking in the gtrid for the node name (recall it is UID + node name). And that is OK now and moving forward for the none distributed case.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>In the distributed case we are adding though, when the recovery manager is looking for orphaned resources registered against the *subordinate* it can't use the node name from the gtrid as that is the node name of the root TM rather than this subordinate.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Therefore I have put the node name of the subordinate in the bqual (which the subordinate transactions can edit).</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Unfortunately a bqual can only be 64 bytes. In this 64 bytes we have to get:</p><p>1. The Uid (this could have been your path solution catted with a sequence number but I went with Uid to minimise change but they are the same for this discussion as they are only part of a bqual) - a Uid is 28 bytes constant</p><p>2. The "EIS name" - as I mentioned this is a requirement from customers - a variable length string</p><p>3. The subordinate node name (so crash recovery can detect orphan XA resources for the subordinate as described above)</p><p><span>4. The parent node name (this was added so the transport can choose to be implemented by a single proxy XA resource per local server that can recover for multiple remote servers and therefore needs to filter out the Xids it gets back from the call to XATerminator::recover by parent node name rather than Xid) *potentially this can be removed - the example I created </span><a class="jive-link-external-small" href="https://svn.jboss.org/repos/labs/labs/jbosstm/branches/JBOSSTS_4_15_0_Final/atsintegration/examples" target="_blank">https://svn.jboss.org/repos/labs/labs/jbosstm/branches/JBOSSTS_4_15_0_Final/atsintegration/examples</a><span> doesn't actually use this as I chose to create a new proxy per transaction, performance testing of the transport will indicate which is the more efficient*</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>So at a minimum we need to get (i.e. if we confirmed that the parent node name would not be of use):</p><p>1. The unique number for the branch</p><p>2. The EIS name</p><p>3. A node name</p><p>Into the 64 bytes of the bqual</p></div>
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