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<h1 id="background-updates-api"><a class="header" href="#background-updates-api">Background Updates API</a></h1>
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<p>This API allows a server administrator to manage the background updates being
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run against the database.</p>
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<h2 id="status"><a class="header" href="#status">Status</a></h2>
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<p>This API gets the current status of the background updates.</p>
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<p>The API is:</p>
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<pre><code>GET /_synapse/admin/v1/background_updates/status
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</code></pre>
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<p>Returning:</p>
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<pre><code class="language-json">{
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"enabled": true,
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"current_updates": {
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"<db_name>": {
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"name": "<background_update_name>",
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"total_item_count": 50,
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"total_duration_ms": 10000.0,
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"average_items_per_ms": 2.2,
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},
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}
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}
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</code></pre>
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<p><code>enabled</code> whether the background updates are enabled or disabled.</p>
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<p><code>db_name</code> the database name (usually Synapse is configured with a single database named 'master').</p>
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<p>For each update:</p>
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<p><code>name</code> the name of the update.
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<code>total_item_count</code> total number of "items" processed (the meaning of 'items' depends on the update in question).
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<code>total_duration_ms</code> how long the background process has been running, not including time spent sleeping.
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<code>average_items_per_ms</code> how many items are processed per millisecond based on an exponential average.</p>
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<h2 id="enabled"><a class="header" href="#enabled">Enabled</a></h2>
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<p>This API allow pausing background updates.</p>
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<p>Background updates should <em>not</em> be paused for significant periods of time, as
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this can affect the performance of Synapse.</p>
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<p><em>Note</em>: This won't persist over restarts.</p>
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<p><em>Note</em>: This won't cancel any update query that is currently running. This is
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usually fine since most queries are short lived, except for <code>CREATE INDEX</code>
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background updates which won't be cancelled once started.</p>
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<p>The API is:</p>
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<pre><code>POST /_synapse/admin/v1/background_updates/enabled
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</code></pre>
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<p>with the following body:</p>
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<pre><code class="language-json">{
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"enabled": false
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}
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</code></pre>
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<p><code>enabled</code> sets whether the background updates are enabled or disabled.</p>
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<p>The API returns the <code>enabled</code> param.</p>
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<pre><code class="language-json">{
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"enabled": false
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}
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</code></pre>
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<p>There is also a <code>GET</code> version which returns the <code>enabled</code> state.</p>
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<h2 id="run"><a class="header" href="#run">Run</a></h2>
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<p>This API schedules a specific background update to run. The job starts immediately after calling the API.</p>
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<p>The API is:</p>
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<pre><code>POST /_synapse/admin/v1/background_updates/start_job
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</code></pre>
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<p>with the following body:</p>
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<pre><code class="language-json">{
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"job_name": "populate_stats_process_rooms"
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}
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</code></pre>
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<p>The following JSON body parameters are available:</p>
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<ul>
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<li><code>job_name</code> - A string which job to run. Valid values are:
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<ul>
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<li><code>populate_stats_process_rooms</code> - Recalculate the stats for all rooms.</li>
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<li><code>regenerate_directory</code> - Recalculate the <a href="../../../user_directory.html">user directory</a> if it is stale or out of sync.</li>
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</ul>
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</li>
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</ul>
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