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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/632965#632965">View the full discussion</a>
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<div class="jive-rendered-content"><blockquote class="jive-quote"><p>Mark Little wrote:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Can you compress the sequence number? What I mean by this is that if it's a Uid and based on the gtrid then maybe you can get rid of the IP address component of the sequence number because it's implicitly there in the gtrid anyway?</p></blockquote><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Sorry I didn't get chance to respond to this yesterday. I have created a BranchId class which is a clone of UID but doesn't utilise the hostname part of it. I have run a build now to check it hasn't broken anything and it is fine but I haven't put this back until we know the route we are going to take.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Removing the hostname from BranchId and giving EIS names transient integer representations gives us a space of:</p><p>64 (bqual)</p><p>     - 12 (branch id)</p><p>     - 4 - eisname key</p><p>     =  58 bytes (available for node names)</p><p>That means there are up-to 29 bytes per name, we will need to store the name length (which given the size available need only be a short) so less 2 bytes leaves 27 bytes to store a node name.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>If this is enough space (and Mark and Jonathan agree that this change to branch qualifiers is sound - it will affect all Xids)  then I can have this changed within an hour and we can proceed to get this out into AS7 trunk. I will have to change the EIS name to an int too of course, but I can add a routine that converts EIS names to the next available int (or short if you shout up now) and logs out the conversion values to the log file as a warning. Would this map of EIS names need to be persisted between runs? I assume not as the transactions jboss logging output file will contain the id of the EIS against the provided name for that particular run. If we *do* need to persist this mapping file then we will need to have a think about the best place to put it, can we assume to dump it out into the current working directory?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>The alternative is to keep with ints for node name, and I can put this out there right now with no change required to EIS name.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Either way I would like to get some agreement as this discussion hasn't slowed the process down so far as I have been comprehensively testing this functionality relying purely on the availablity of the node name "tokens" in an Xid but as I near the end of available tests I can perform, it really needs to get into Davids hands to provide this new functionality into AS7.</p></div>
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