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237 lines
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<ol class="chapter"><li class="chapter-item expanded affix "><li class="part-title">Introduction</li><li class="chapter-item expanded "><a href="welcome_and_overview.html">Welcome and Overview</a></li><li class="chapter-item expanded affix "><li class="part-title">Setup</li><li class="chapter-item expanded "><a href="setup/installation.html">Installation</a></li><li class="chapter-item expanded "><a href="postgres.html">Using Postgres</a></li><li class="chapter-item expanded "><a href="reverse_proxy.html">Configuring a Reverse Proxy</a></li><li class="chapter-item expanded "><a href="setup/forward_proxy.html">Configuring a Forward/Outbound Proxy</a></li><li class="chapter-item expanded "><a href="turn-howto.html">Configuring a Turn Server</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="setup/turn/coturn.html">coturn TURN server</a></li><li class="chapter-item expanded "><a href="setup/turn/eturnal.html">eturnal TURN server</a></li></ol></li><li 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Web Tokens</a></li><li class="chapter-item expanded "><a href="usage/configuration/user_authentication/refresh_tokens.html">Refresh Tokens</a></li></ol></li><li class="chapter-item expanded "><a href="CAPTCHA_SETUP.html">Registration Captcha</a></li><li class="chapter-item expanded "><a href="application_services.html">Application Services</a></li><li class="chapter-item expanded "><a href="server_notices.html">Server Notices</a></li><li class="chapter-item expanded "><a href="consent_tracking.html">Consent Tracking</a></li><li class="chapter-item expanded "><a href="user_directory.html">User Directory</a></li><li class="chapter-item expanded "><a href="message_retention_policies.html">Message Retention Policies</a></li><li class="chapter-item expanded "><a href="modules/index.html">Pluggable Modules</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="modules/writing_a_module.html">Writing a module</a></li><li><ol class="section"><li class="chapter-item expanded 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Groups</a></li><li class="chapter-item expanded "><a href="usage/administration/request_log.html">Request log format</a></li><li class="chapter-item expanded "><a href="usage/administration/admin_faq.html">Admin FAQ</a></li><li class="chapter-item expanded "><div>Scripts</div></li></ol></li><li class="chapter-item expanded "><li class="part-title">Development</li><li class="chapter-item expanded "><a href="development/contributing_guide.html">Contributing Guide</a></li><li class="chapter-item expanded "><a href="code_style.html">Code Style</a></li><li class="chapter-item expanded "><a href="development/reviews.html">Reviewing Code</a></li><li class="chapter-item expanded "><a href="development/releases.html">Release Cycle</a></li><li class="chapter-item expanded "><a href="development/git.html">Git Usage</a></li><li class="chapter-item expanded "><div>Testing</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="development/demo.html">Demo 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<h1 id="replication-architecture"><a class="header" href="#replication-architecture">Replication Architecture</a></h1>
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<h2 id="motivation"><a class="header" href="#motivation">Motivation</a></h2>
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<p>We'd like to be able to split some of the work that synapse does into
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multiple python processes. In theory multiple synapse processes could
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share a single postgresql database and we'd scale up by running more
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synapse processes. However much of synapse assumes that only one process
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is interacting with the database, both for assigning unique identifiers
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when inserting into tables, notifying components about new updates, and
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for invalidating its caches.</p>
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<p>So running multiple copies of the current code isn't an option. One way
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to run multiple processes would be to have a single writer process and
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multiple reader processes connected to the same database. In order to do
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this we'd need a way for the reader process to invalidate its in-memory
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caches when an update happens on the writer. One way to do this is for
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the writer to present an append-only log of updates which the readers
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can consume to invalidate their caches and to push updates to listening
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clients or pushers.</p>
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<p>Synapse already stores much of its data as an append-only log so that it
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can correctly respond to <code>/sync</code> requests so the amount of code changes
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needed to expose the append-only log to the readers should be fairly
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minimal.</p>
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<h2 id="architecture"><a class="header" href="#architecture">Architecture</a></h2>
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<h3 id="the-replication-protocol"><a class="header" href="#the-replication-protocol">The Replication Protocol</a></h3>
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<p>See <a href="tcp_replication.html">the TCP replication documentation</a>.</p>
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<h3 id="the-slaved-datastore"><a class="header" href="#the-slaved-datastore">The Slaved DataStore</a></h3>
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<p>There are read-only version of the synapse storage layer in
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<code>synapse/replication/slave/storage</code> that use the response of the
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replication API to invalidate their caches.</p>
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<h3 id="the-tcp-replication-module"><a class="header" href="#the-tcp-replication-module">The TCP Replication Module</a></h3>
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<p>Information about how the tcp replication module is structured, including how
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the classes interact, can be found in
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<code>synapse/replication/tcp/__init__.py</code></p>
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