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92 lines
5.3 KiB
HTML
92 lines
5.3 KiB
HTML
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>Connecting to a new site</title>
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<link rel="stylesheet" href="gettingStarted.css" type="text/css" />
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="start" href="index.html" title="Berkeley DB Programmer's Reference Guide" />
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<link rel="up" href="rep.html" title="Chapter 12. Berkeley DB Replication" />
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<link rel="prev" href="rep_comm.html" title="Building the communications infrastructure" />
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<link rel="next" href="group_membership.html" title="Managing Replication Manager Group Membership" />
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</head>
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<body>
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<div xmlns="" class="navheader">
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<div class="libver">
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<p>Library Version 11.2.5.3</p>
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">Connecting to a new site</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="rep_comm.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 12.
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Berkeley DB Replication
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="group_membership.html">Next</a></td>
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</tr>
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</table>
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<hr />
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</div>
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<div class="sect1" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="rep_newsite"></a>Connecting to a new site</h2>
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</div>
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</div>
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</div>
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<p>To add a new site to the replication group all that is needed
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is for the client member to join. Berkeley DB will perform an
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internal initialization from the master to the client automatically
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and will run recovery on the client to bring it up to date
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with the master.</p>
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<p>For Base API applications, connecting to a
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new site in the replication group happens whenever the
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<a href="../api_reference/C/repmessage.html" class="olink">DB_ENV->rep_process_message()</a> method returns <a href="../api_reference/C/repmessage.html#repmsg_DB_REP_NEWSITE" class="olink">DB_REP_NEWSITE</a>. The application
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should assign the new site a local environment ID number, and all future
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messages from the site passed to <a href="../api_reference/C/repmessage.html" class="olink">DB_ENV->rep_process_message()</a> should include that
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environment ID number. It is possible, of course, for the application
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to be aware of a new site before the return of <a href="../api_reference/C/repmessage.html" class="olink">DB_ENV->rep_process_message()</a> (for
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example, applications using connection-oriented protocols are likely to
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detect new sites immediately, while applications using broadcast
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protocols may not).</p>
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<p>Regardless, in applications supporting the dynamic addition of database
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environments to replication groups, environments joining an existing
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replication group may need to provide contact information. (For
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example, in an application using TCP/IP sockets, a DNS name or IP
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address might be a reasonable value to provide.) This can be done using
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the <span class="bold"><strong>cdata</strong></span> parameter to the <a href="../api_reference/C/repstart.html" class="olink">DB_ENV->rep_start()</a> method. The information
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referenced by <span class="bold"><strong>cdata</strong></span> is wrapped in the initial contact message
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sent by the new environment, and is provided to the existing members of
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the group using the <span class="bold"><strong>rec</strong></span> parameter returned by <a href="../api_reference/C/repmessage.html" class="olink">DB_ENV->rep_process_message()</a>.
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If no additional information was provided for Berkeley DB to forward to the
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existing members of the group, the <span class="bold"><strong>data</strong></span> field of the <span class="bold"><strong>rec</strong></span>
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parameter passed to the <a href="../api_reference/C/repmessage.html" class="olink">DB_ENV->rep_process_message()</a> method will be NULL after
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<a href="../api_reference/C/repmessage.html" class="olink">DB_ENV->rep_process_message()</a> returns <a href="../api_reference/C/repmessage.html#repmsg_DB_REP_NEWSITE" class="olink">DB_REP_NEWSITE</a>.</p>
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<p>Replication Manager automatically distributes contact information
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using the mechanisms previously described.</p>
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</div>
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<div class="navfooter">
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<hr />
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<table width="100%" summary="Navigation footer">
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="rep_comm.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="rep.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="group_membership.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">Building the communications infrastructure </td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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</td>
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<td width="40%" align="right" valign="top"> Managing Replication Manager Group Membership</td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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