<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<body link="#355491" alink="#4262a1" vlink="#355491" style="background: #e2e2e2; margin: 0; padding: 20px;">
<div>
<table cellpadding="0" bgcolor="#FFFFFF" border="0" cellspacing="0" style="border: 1px solid #dadada; margin-bottom: 30px; width: 100%; -moz-border-radius: 6px; -webkit-border-radius: 6px;">
<tbody>
<tr>
<td>
<table border="0" cellpadding="0" cellspacing="0" bgcolor="#FFFFFF" style="border: solid 2px #ccc; background: #dadada; width: 100%; -moz-border-radius: 6px; -webkit-border-radius: 6px;">
<tbody>
<tr>
<td bgcolor="#000000" valign="middle" height="58px" style="border-bottom: 1px solid #ccc; padding: 20px; -moz-border-radius-topleft: 3px; -moz-border-radius-topright: 3px; -webkit-border-top-right-radius: 5px; -webkit-border-top-left-radius: 5px;">
<h1 style="color: #333333; font: bold 22px Arial, Helvetica, sans-serif; margin: 0; display: block !important;">
<!-- To have a header image/logo replace the name below with your img tag -->
<!-- Email clients will render the images when the message is read so any image -->
<!-- must be made available on a public server, so that all recipients can load the image. -->
<a href="http://community.jboss.org/index.jspa" style="text-decoration: none; color: #E1E1E1">JBoss Community</a></h1>
</td>
</tr>
<tr>
<td bgcolor="#FFFFFF" style="font: normal 12px Arial, Helvetica, sans-serif; color:#333333; padding: 20px; -moz-border-radius-bottomleft: 4px; -moz-border-radius-bottomright: 4px; -webkit-border-bottom-right-radius: 5px; -webkit-border-bottom-left-radius: 5px;"><h3 style="margin: 10px 0 5px; font-size: 17px; font-weight: normal;">
Re: Remote txinflow: XID changes
</h3>
<span style="margin-bottom: 10px;">
created by <a href="http://community.jboss.org/people/jhalliday">Jonathan Halliday</a> in <i>JBoss Transactions Development</i> - <a href="http://community.jboss.org/message/632598#632598">View the full discussion</a>
</span>
<hr style="margin: 20px 0; border: none; background-color: #dadada; height: 1px;">
<div class="jive-rendered-content"><p>> But I'm not sure what you mean by "orphans" exactly - aren't all branches normally recovered by the root?  If so, does the subordinate path actually matter?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>An orphan is a prepared RM whose immediate parent has died without writing a log. Under presumed abort it has got to be rolled back. Only the immediate parent can do that - NOT the root (unless they are the same). The reason is simple: only the immediate parent can recognize the orphan status, as it's a function of the absence of a log record at that location. Also, in some deployments only the immediate parent may have the driver and connection details to reach that orphan - they are not guaranteed to be available at the root.  Part of the reason that nodes need a uniq id is that encoding it into the Xid allows them to recognize their own orphaned branches and likewise avoid tampering with ones they don't own.  You can actually eliminate the need for globally uniq id by writing to the log twice - once before and once after preparing the RM, in which case you don't get orphans any more. The cure is worse than the disease though - those log writes to disk drop your performance to unacceptable levels.</p></div>
<div style="background-color: #f4f4f4; padding: 10px; margin-top: 20px;">
<p style="margin: 0;">Reply to this message by <a href="http://community.jboss.org/message/632598#632598">going to Community</a></p>
<p style="margin: 0;">Start a new discussion in JBoss Transactions Development at <a href="http://community.jboss.org/choose-container!input.jspa?contentType=1&containerType=14&container=2041">Community</a></p>
</div></td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
</div>
</body>
</html>