Materialize/doc/user/layouts/shortcodes/alter-cluster/alter-clusters-cmd-options.html

<table>
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<th>Option</th>
<th>Description</th>
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<td><code>TIMEOUT</code></td>
<td>The maximum duration to wait for the new replicas to be ready.</td>
</tr>
<tr>
<td><code>ON TIMEOUT</code></td>
<td>The action to take on timeout. <br><ul><li><code>COMMIT</code> cuts over to the new replica regardless of its hydration status, which may lead to downtime.</li><li><code>ROLLBACK</code> removes the pending replica and returns a timeout error.</li></ul>Default: <code>COMMIT</code>.</td>
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</tbody>
</table>