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498 lines
16 KiB
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</head>
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<body>
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<div class="document" id="bus-alt-connection">
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<h1 class="title">Bus Alt Connection</h1>
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<!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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!! This file is generated by oca-gen-addon-readme !!
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!! changes will be overwritten. !!
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!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
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<p><a class="reference external" href="https://odoo-community.org/page/development-status"><img alt="Beta" src="https://img.shields.io/badge/maturity-Beta-yellow.png" /></a> <a class="reference external" href="http://www.gnu.org/licenses/agpl-3.0-standalone.html"><img alt="License: AGPL-3" src="https://img.shields.io/badge/licence-AGPL--3-blue.png" /></a> <a class="reference external" href="https://github.com/OCA/server-tools/tree/12.0/bus_alt_connection"><img alt="OCA/server-tools" src="https://img.shields.io/badge/github-OCA%2Fserver--tools-lightgray.png?logo=github" /></a> <a class="reference external" href="https://translation.odoo-community.org/projects/server-tools-12-0/server-tools-12-0-bus_alt_connection"><img alt="Translate me on Weblate" src="https://img.shields.io/badge/weblate-Translate%20me-F47D42.png" /></a> <a class="reference external" href="https://runbot.odoo-community.org/runbot/149/12.0"><img alt="Try me on Runbot" src="https://img.shields.io/badge/runbot-Try%20me-875A7B.png" /></a></p>
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<p>This module makes it possible to use <a class="reference external" href="https://pgbouncer.github.io/">PgBouncer</a> as a connection pooler
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for odoo.</p>
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<div class="section" id="why-isn-t-odoo-s-connection-pooling-good-enough">
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<h1>Why isn’t odoo’s connection pooling good enough?</h1>
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<p>Odoo’s builtin connection pooling works at process level: each Odoo process
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has its own <a class="reference external" href="https://github.com/odoo/odoo/blob/12.0/odoo/sql_db.py#L525">ConnectionPool</a>, limited to <tt class="docutils literal">db_maxconn</tt>.</p>
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<p>It does the job of re-using open connections available in the pool.
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But it never closes these connections, <a class="reference external" href="https://github.com/odoo/odoo/blob/12.0/odoo/sql_db.py#L593">unless reaching db_maxconn</a>.</p>
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<p>In practice, we observe that each odoo worker will end up
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with up to 3 open connection in its pool.
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With 10 http workers, that’s up to 30 connection continuously open just
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for one single instance.</p>
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</div>
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<div class="section" id="here-comes-pgbouncer">
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<h1>Here comes PgBouncer</h1>
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<p>PgBouncer will help to limit this number of open connections,
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by sharing a pool of connections at the instance level, between
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all workers. Odoo workers will still have up to 3 open connections,
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but these will be connections to PgBouncer, that on its side will
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close unnecessary connections to pg.</p>
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<p>This has proven to help performances on Odoo deployments with
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multiple instances.</p>
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<p>It allows you to define how resources should be shared,
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according to your priorities, e.g. :</p>
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<ul class="simple">
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<li>key odoo instance on host A can open up to 30 connections</li>
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<li>while odoo instance on host B, dedicated to reports,
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can open up to 10 connections only</li>
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</ul>
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<p>And most importantly, it helps you to ensure that
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<tt class="docutils literal">max_connections</tt> will never be reached on pg server side.</p>
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</div>
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<div class="section" id="why-is-this-module-needed">
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<h1>Why is this module needed?</h1>
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<p>When configuring PgBouncer, you can choose between 2 transaction pooling modes:</p>
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<ul class="simple">
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<li><cite>pool_mode = session</cite></li>
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<li><cite>pool_mode = transaction</cite></li>
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</ul>
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<p>If we choose <cite>pool_mode = session</cite>, then one server connection will be tied
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to a given odoo process until its death, which is exactly what we’re trying
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to change. Thus, to release the server connection once the transaction is
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complete, we use <cite>pool_mode = transaction</cite>.</p>
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<p>This works fine, except for Odoo’s longpolling features that relies
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on the <a class="reference external" href="https://www.postgresql.org/docs/9.6/static/sql-notify.html">LISTEN/NOTIFY</a> mechanism from pg, which is <a class="reference external" href="https://wiki.postgresql.org/wiki/PgBouncer">not compatible</a> with that
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mode.</p>
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<p>To be more precise, <cite>NOTIFY</cite> statements are properly transfered by PgBouncer
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in that mode; only the <cite>LISTEN</cite> statement isn’t (because it needs to keep the
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server connection open).</p>
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<p>So for the unique “listening” connection per instance that requires this
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statement (<a class="reference external" href="https://github.com/odoo/odoo/blob/12.0/addons/bus/models/bus.py#L166">here</a>), we need odoo to connect directly to the pg server, bypassing
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PgBouncer.</p>
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<p>That’s what this module implements, by overriding the relevant method
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of the <a class="reference external" href="https://github.com/odoo/odoo/blob/12.0/addons/bus/models/bus.py#L105">Dispatcher</a>.</p>
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<p><strong>Table of contents</strong></p>
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</div>
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<div class="section" id="installation">
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<h1>Installation</h1>
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<p>You don’t need to install this module in the database(s) to enable it.</p>
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<p>But you need to load it server-wide:</p>
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<ul class="simple">
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<li>By starting Odoo with <tt class="docutils literal"><span class="pre">--load=web,bus_alt_connection</span></tt></li>
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<li>Or by updating its configuration file:</li>
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</ul>
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<pre class="code ini literal-block">
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<span class="k">[options]</span>
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<span class="na">(...)</span>
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<span class="na">server_wide_modules</span> <span class="o">=</span> <span class="s">web,bus_alt_connection</span>
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</pre>
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</div>
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<div class="section" id="configuration">
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<h1>Configuration</h1>
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<p>You need to define how to connect directly to the database:</p>
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<ul>
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<li><p class="first">Either by defining environment variables:</p>
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<blockquote>
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<ul class="simple">
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<li><tt class="docutils literal"><span class="pre">IMDISPATCHER_DB_HOST=db-01</span></tt></li>
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<li><tt class="docutils literal">IMDISPATCHER_DB_PORT=5432</tt></li>
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</ul>
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</blockquote>
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</li>
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<li><p class="first">Or in Odoo’s configuration file:</p>
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</li>
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</ul>
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<pre class="code ini literal-block">
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<span class="k">[options]</span>
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<span class="na">(...)</span>
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<span class="na">imdispatcher_db_host</span> <span class="o">=</span> <span class="s">db-01</span>
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<span class="na">imdispatcher_db_port</span> <span class="o">=</span> <span class="s">5432</span>
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</pre>
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</div>
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<div class="section" id="bug-tracker">
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<h1>Bug Tracker</h1>
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<p>Bugs are tracked on <a class="reference external" href="https://github.com/OCA/server-tools/issues">GitHub Issues</a>.
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In case of trouble, please check there if your issue has already been reported.
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|
If you spotted it first, help us smashing it by providing a detailed and welcomed
|
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<a class="reference external" href="https://github.com/OCA/server-tools/issues/new?body=module:%20bus_alt_connection%0Aversion:%2012.0%0A%0A**Steps%20to%20reproduce**%0A-%20...%0A%0A**Current%20behavior**%0A%0A**Expected%20behavior**">feedback</a>.</p>
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|
<p>Do not contact contributors directly about support or help with technical issues.</p>
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|
</div>
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<div class="section" id="credits">
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<h1>Credits</h1>
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<div class="section" id="authors">
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<h2>Authors</h2>
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<ul class="simple">
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<li>Trobz</li>
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</ul>
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</div>
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<div class="section" id="contributors">
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<h2>Contributors</h2>
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<ul class="simple">
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<li>Nils Hamerlinck <<a class="reference external" href="mailto:nils@trobz.com">nils@trobz.com</a>></li>
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</ul>
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</div>
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<div class="section" id="maintainers">
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<h2>Maintainers</h2>
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<p>This module is maintained by the OCA.</p>
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<a class="reference external image-reference" href="https://odoo-community.org"><img alt="Odoo Community Association" src="https://odoo-community.org/logo.png" /></a>
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<p>OCA, or the Odoo Community Association, is a nonprofit organization whose
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mission is to support the collaborative development of Odoo features and
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promote its widespread use.</p>
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<p>This module is part of the <a class="reference external" href="https://github.com/OCA/server-tools/tree/12.0/bus_alt_connection">OCA/server-tools</a> project on GitHub.</p>
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<p>You are welcome to contribute. To learn how please visit <a class="reference external" href="https://odoo-community.org/page/Contribute">https://odoo-community.org/page/Contribute</a>.</p>
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</div>
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</div>
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</div>
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</body>
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</html>
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