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(Shortkey: s)" aria-label="Toggle Searchbar" aria-expanded="false" aria-keyshortcuts="S" aria-controls="searchbar"> - <i class="fa fa-search"></i> - </button> - - </div> - - <h1 class="menu-title">Synapse</h1> - - <div class="right-buttons"> - - <a href="print.html" title="Print this book" aria-label="Print this book"> - <i id="print-button" class="fa fa-print"></i> - </a> - - - <a href="https://github.com/matrix-org/synapse" title="Git repository" aria-label="Git repository"> - <i id="git-repository-button" class="fa fa-github"></i> - </a> - - - <a href="https://github.com/matrix-org/synapse/edit/develop/docs/message_retention_policies.md" title="Suggest an edit" aria-label="Suggest an edit"> - <i id="git-edit-button" class="fa fa-edit"></i> - </a> - - - </div> - </div> - - - <div id="search-wrapper" class="hidden"> - <form id="searchbar-outer" class="searchbar-outer"> - <input type="search" id="searchbar" name="searchbar" placeholder="Search this book ..." aria-controls="searchresults-outer" aria-describedby="searchresults-header"> - </form> - <div id="searchresults-outer" class="searchresults-outer hidden"> - <div id="searchresults-header" class="searchresults-header"></div> - <ul id="searchresults"> - </ul> - </div> - </div> - - - <!-- Apply ARIA attributes after the sidebar and the sidebar toggle button are added to the DOM --> - <script type="text/javascript"> - document.getElementById('sidebar-toggle').setAttribute('aria-expanded', sidebar === 'visible'); - document.getElementById('sidebar').setAttribute('aria-hidden', sidebar !== 'visible'); - Array.from(document.querySelectorAll('#sidebar a')).forEach(function(link) { - link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1); - }); - </script> - - <div id="content" class="content"> - <main> - <!-- Page table of contents --> - <div class="sidetoc"> - <nav class="pagetoc"></nav> - </div> - - <h1 id="message-retention-policies"><a class="header" href="#message-retention-policies">Message retention policies</a></h1> -<p>Synapse admins can enable support for message retention policies on -their homeserver. Message retention policies exist at a room level, -follow the semantics described in -<a href="https://github.com/matrix-org/matrix-doc/blob/matthew/msc1763/proposals/1763-configurable-retention-periods.md">MSC1763</a>, -and allow server and room admins to configure how long messages should -be kept in a homeserver's database before being purged from it. -<strong>Please note that, as this feature isn't part of the Matrix -specification yet, this implementation is to be considered as -experimental.</strong> </p> -<p>A message retention policy is mainly defined by its <code>max_lifetime</code> -parameter, which defines how long a message can be kept around after -it was sent to the room. If a room doesn't have a message retention -policy, and there's no default one for a given server, then no message -sent in that room is ever purged on that server.</p> -<p>MSC1763 also specifies semantics for a <code>min_lifetime</code> parameter which -defines the amount of time after which an event <em>can</em> get purged (after -it was sent to the room), but Synapse doesn't currently support it -beyond registering it.</p> -<p>Both <code>max_lifetime</code> and <code>min_lifetime</code> are optional parameters.</p> -<p>Note that message retention policies don't apply to state events.</p> -<p>Once an event reaches its expiry date (defined as the time it was sent -plus the value for <code>max_lifetime</code> in the room), two things happen:</p> -<ul> -<li>Synapse stops serving the event to clients via any endpoint.</li> -<li>The message gets picked up by the next purge job (see the &quot;Purge jobs&quot; -section) and is removed from Synapse's database.</li> -</ul> -<p>Since purge jobs don't run continuously, this means that an event might -stay in a server's database for longer than the value for <code>max_lifetime</code> -in the room would allow, though hidden from clients.</p> -<p>Similarly, if a server (with support for message retention policies -enabled) receives from another server an event that should have been -purged according to its room's policy, then the receiving server will -process and store that event until it's picked up by the next purge job, -though it will always hide it from clients.</p> -<p>Synapse requires at least one message in each room, so it will never -delete the last message in a room. It will, however, hide it from -clients.</p> -<h2 id="server-configuration"><a class="header" href="#server-configuration">Server configuration</a></h2> -<p>Support for this feature can be enabled and configured in the -<code>retention</code> section of the Synapse configuration file (see the -<a href="https://github.com/matrix-org/synapse/blob/v1.36.0/docs/sample_config.yaml#L451-L518">sample file</a>).</p> -<p>To enable support for message retention policies, set the setting -<code>enabled</code> in this section to <code>true</code>.</p> -<h3 id="default-policy"><a class="header" href="#default-policy">Default policy</a></h3> -<p>A default message retention policy is a policy defined in Synapse's -configuration that is used by Synapse for every room that doesn't have a -message retention policy configured in its state. This allows server -admins to ensure that messages are never kept indefinitely in a server's -database. </p> -<p>A default policy can be defined as such, in the <code>retention</code> section of -the configuration file:</p> -<pre><code class="language-yaml"> default_policy: - min_lifetime: 1d - max_lifetime: 1y -</code></pre> -<p>Here, <code>min_lifetime</code> and <code>max_lifetime</code> have the same meaning and level -of support as previously described. They can be expressed either as a -duration (using the units <code>s</code> (seconds), <code>m</code> (minutes), <code>h</code> (hours), -<code>d</code> (days), <code>w</code> (weeks) and <code>y</code> (years)) or as a number of milliseconds.</p> -<h3 id="purge-jobs"><a class="header" href="#purge-jobs">Purge jobs</a></h3> -<p>Purge jobs are the jobs that Synapse runs in the background to purge -expired events from the database. They are only run if support for -message retention policies is enabled in the server's configuration. If -no configuration for purge jobs is configured by the server admin, -Synapse will use a default configuration, which is described in the -<a href="https://github.com/matrix-org/synapse/blob/v1.36.0/docs/sample_config.yaml#L451-L518">sample configuration file</a>.</p> -<p>Some server admins might want a finer control on when events are removed -depending on an event's room's policy. This can be done by setting the -<code>purge_jobs</code> sub-section in the <code>retention</code> section of the configuration -file. An example of such configuration could be:</p> -<pre><code class="language-yaml"> purge_jobs: - - longest_max_lifetime: 3d - interval: 12h - - shortest_max_lifetime: 3d - longest_max_lifetime: 1w - interval: 1d - - shortest_max_lifetime: 1w - interval: 2d -</code></pre> -<p>In this example, we define three jobs:</p> -<ul> -<li>one that runs twice a day (every 12 hours) and purges events in rooms -which policy's <code>max_lifetime</code> is lower or equal to 3 days.</li> -<li>one that runs once a day and purges events in rooms which policy's -<code>max_lifetime</code> is between 3 days and a week.</li> -<li>one that runs once every 2 days and purges events in rooms which -policy's <code>max_lifetime</code> is greater than a week.</li> -</ul> -<p>Note that this example is tailored to show different configurations and -features slightly more jobs than it's probably necessary (in practice, a -server admin would probably consider it better to replace the two last -jobs with one that runs once a day and handles rooms which which -policy's <code>max_lifetime</code> is greater than 3 days).</p> -<p>Keep in mind, when configuring these jobs, that a purge job can become -quite heavy on the server if it targets many rooms, therefore prefer -having jobs with a low interval that target a limited set of rooms. Also -make sure to include a job with no minimum and one with no maximum to -make sure your configuration handles every policy.</p> -<p>As previously mentioned in this documentation, while a purge job that -runs e.g. every day means that an expired event might stay in the -database for up to a day after its expiry, Synapse hides expired events -from clients as soon as they expire, so the event is not visible to -local users between its expiry date and the moment it gets purged from -the server's database.</p> -<h3 id="lifetime-limits"><a class="header" href="#lifetime-limits">Lifetime limits</a></h3> -<p>Server admins can set limits on the values of <code>max_lifetime</code> to use when -purging old events in a room. These limits can be defined as such in the -<code>retention</code> section of the configuration file:</p> -<pre><code class="language-yaml"> allowed_lifetime_min: 1d - allowed_lifetime_max: 1y -</code></pre> -<p>The limits are considered when running purge jobs. If necessary, the -effective value of <code>max_lifetime</code> will be brought between -<code>allowed_lifetime_min</code> and <code>allowed_lifetime_max</code> (inclusive). -This means that, if the value of <code>max_lifetime</code> defined in the room's state -is lower than <code>allowed_lifetime_min</code>, the value of <code>allowed_lifetime_min</code> -will be used instead. Likewise, if the value of <code>max_lifetime</code> is higher -than <code>allowed_lifetime_max</code>, the value of <code>allowed_lifetime_max</code> will be -used instead.</p> -<p>In the example above, we ensure Synapse never deletes events that are less -than one day old, and that it always deletes events that are over a year -old.</p> -<p>If a default policy is set, and its <code>max_lifetime</code> value is lower than -<code>allowed_lifetime_min</code> or higher than <code>allowed_lifetime_max</code>, the same -process applies.</p> -<p>Both parameters are optional; if one is omitted Synapse won't use it to -adjust the effective value of <code>max_lifetime</code>.</p> -<p>Like other settings in this section, these parameters can be expressed -either as a duration or as a number of milliseconds.</p> -<h2 id="room-configuration"><a class="header" href="#room-configuration">Room configuration</a></h2> -<p>To configure a room's message retention policy, a room's admin or -moderator needs to send a state event in that room with the type -<code>m.room.retention</code> and the following content:</p> -<pre><code class="language-json">{ - &quot;max_lifetime&quot;: ... -} -</code></pre> -<p>In this event's content, the <code>max_lifetime</code> parameter has the same -meaning as previously described, and needs to be expressed in -milliseconds. The event's content can also include a <code>min_lifetime</code> -parameter, which has the same meaning and limited support as previously -described.</p> -<p>Note that over every server in the room, only the ones with support for -message retention policies will actually remove expired events. This -support is currently not enabled by default in Synapse.</p> -<h2 id="note-on-reclaiming-disk-space"><a class="header" href="#note-on-reclaiming-disk-space">Note on reclaiming disk space</a></h2> -<p>While purge jobs actually delete data from the database, the disk space -used by the database might not decrease immediately on the database's -host. However, even though the database engine won't free up the disk -space, it will start writing new data into where the purged data was.</p> -<p>If you want to reclaim the freed disk space anyway and return it to the -operating system, the server admin needs to run <code>VACUUM FULL;</code> (or -<code>VACUUM;</code> for SQLite databases) on Synapse's database (see the related -<a href="https://www.postgresql.org/docs/current/sql-vacuum.html">PostgreSQL documentation</a>).</p> - - </main> - - <nav class="nav-wrapper" aria-label="Page navigation"> - <!-- Mobile navigation buttons --> - - <a rel="prev" href="user_directory.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left"> - <i class="fa fa-angle-left"></i> - </a> - - - - <a rel="next" href="modules/index.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right"> - <i class="fa fa-angle-right"></i> - </a> - - - <div style="clear: both"></div> - </nav> - </div> - </div> - - <nav class="nav-wide-wrapper" aria-label="Page navigation"> - - <a rel="prev" href="user_directory.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left"> - <i class="fa fa-angle-left"></i> - </a> - - - - <a rel="next" href="modules/index.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right"> - <i class="fa fa-angle-right"></i> - </a> - - </nav> - - </div> - - - - - - - - - <script type="text/javascript"> - window.playground_copyable = true; - </script> - - - - - - <script src="elasticlunr.min.js" type="text/javascript" charset="utf-8"></script> - <script src="mark.min.js" type="text/javascript" charset="utf-8"></script> - <script src="searcher.js" type="text/javascript" charset="utf-8"></script> - - - <script src="clipboard.min.js" type="text/javascript" charset="utf-8"></script> - <script src="highlight.js" type="text/javascript" charset="utf-8"></script> - <script src="book.js" type="text/javascript" charset="utf-8"></script> - - <!-- Custom JS scripts --> - - <script type="text/javascript" src="docs/website_files/table-of-contents.js"></script> - - - - - </body> -</html> \ No newline at end of file