+ pool_size: 10 # base 10 → grows to 100 under burst</code></pre><p>A misspelled pool key (<code>pool:</code>, <code>poolsize:</code>, <code>pool_timout:</code>) is reported on load with a suggestion instead of silently leaving the default in place — see <a href="../connection_yml/#Unrecognised-keys">Unrecognised keys</a>.</p><ul><li><p><strong>Acquire timeout (<code>pool_timeout</code>):</strong> How long <code>acquire_connection</code> waits for a free connection before raising <code>PoolTimeoutError</code> — default <strong>30 s</strong>. Set <code>pool_timeout:</code> in <code>connection.yml</code> (seconds; fractional allowed) to <em>fail fast</em> instead of blocking a request while the pool is saturated:</p><pre><code class="language-yaml hljs">dev:
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