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     Sending Periodic Acknowledgment
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 <p>Servers use periodic acknowledgment to reduce the likelihood of duplicate notifications, and to reduce resource usage.</p>

 <p><a id="concept_868B8082463846DE9F35BBEA56105C82__section_D4375BCCF8A2426BA58073B9549B6F04"></a>
 When redundancy is enabled for high availability and <code>redundancy-level</code> is set to 1 or higher, clients send (and servers expect) periodic acknowledgment messages at configurable intervals for notifications they have received. A periodic ack is not sent by the client if there are no unacknowledged notifications at the time.</p>

 <p>Use the following system properties in the <code>geode.properties</code> file to configure periodic ack.</p>

 <table>
 <colgroup>
 <col width="50%" />
 <col width="50%" />
 </colgroup>
 <tbody>
 <tr class="odd">
 <td><code class="ph codeph">notify-ack-interval</code></td>
 <td><p>Minimum period between two consecutive acknowledgment messages sent from the client to the server. The default setting (in seconds) is 10.</p></td>
 </tr>
 <tr class="even">
 <td><code class="ph codeph">notify-dupcheck-life</code></td>
 <td><p>Minimum time a client continues to track a notification source for duplicates when no new notifications arrive before expiring it. The default setting (in seconds) is 300.</p></td>
 </tr>
 </tbody>
 </table>

 <p>The Pool API also provides attributes to configure periodic ack and duplicate message tracking timeout. See <code>subscription-message-tracking-timeout</code> and <code>subscription-ack-interval</code> in the list of pool attributes under <a href="/docs/geode-native/dotnet/113/connection-pools/configuring-pools.html#configuring-pools">Configuring Pools for Servers or Locators</a>.</p>


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	<h1 class="title-container" >
	Sending Periodic Acknowledgment
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	-->

	<p>Servers use periodic acknowledgment to reduce the likelihood of duplicate notifications, and to reduce resource usage.</p>

	<p><a id="concept_868B8082463846DE9F35BBEA56105C82__section_D4375BCCF8A2426BA58073B9549B6F04"></a>
	When redundancy is enabled for high availability and <code>redundancy-level</code> is set to 1 or higher, clients send (and servers expect) periodic acknowledgment messages at configurable intervals for notifications they have received. A periodic ack is not sent by the client if there are no unacknowledged notifications at the time.</p>

	<p>Use the following system properties in the <code>geode.properties</code> file to configure periodic ack.</p>

	<table>
	<colgroup>
	<col width="50%" />
	<col width="50%" />
	</colgroup>
	<tbody>
	<tr class="odd">
	<td><code class="ph codeph">notify-ack-interval</code></td>
	<td><p>Minimum period between two consecutive acknowledgment messages sent from the client to the server. The default setting (in seconds) is 10.</p></td>
	</tr>
	<tr class="even">
	<td><code class="ph codeph">notify-dupcheck-life</code></td>
	<td><p>Minimum time a client continues to track a notification source for duplicates when no new notifications arrive before expiring it. The default setting (in seconds) is 300.</p></td>
	</tr>
	</tbody>
	</table>

	<p>The Pool API also provides attributes to configure periodic ack and duplicate message tracking timeout. See <code>subscription-message-tracking-timeout</code> and <code>subscription-ack-interval</code> in the list of pool attributes under <a href="/docs/geode-native/dotnet/113/connection-pools/configuring-pools.html#configuring-pools">Configuring Pools for Servers or Locators</a>.</p>



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