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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-61802] Implement pre-image expiration configuration parameter propagation and persistence using Mechanism for Specifying Cluster-Wide Configuration Options</title>
                <link>https://jira.mongodb.org/browse/SERVER-61802</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In PM-1944&#160;a cluster-wide configuration parameter was added to provide control on how much time can pass after the change event occurrence when the system can purge any state required to provide pre- and post-images for the change event. Implement&#160;propagation throughout the cluster and persistence aspects of that parameter by leveraging mechanisms provided by PM-2502 (Mechanism for Specifying Cluster-Wide Configuration Options).&lt;/p&gt;

&lt;p&gt;Additional scope:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Enable the feature flag that guards the configuration parameter, so the time-based change stream pre-image retention policy becomes accessible to the users.&lt;/li&gt;
	&lt;li&gt;Create a task to remove the feature flag referred to above.&lt;/li&gt;
&lt;/ul&gt;




&lt;p&gt;The parameter was introduced by&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58692&quot; title=&quot;Introduce cluster-wide pre-image expiration parameter&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58692&quot;&gt;&lt;del&gt;SERVER-58692&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1939239">SERVER-61802</key>
            <summary>Implement pre-image expiration configuration parameter propagation and persistence using Mechanism for Specifying Cluster-Wide Configuration Options</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="1" iconUrl="https://jira.mongodb.org/images/icons/priorities/blocker.svg">Blocker - P1</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="13201">Fixed</resolution>
                                        <assignee username="varun.ravichandran@mongodb.com">Varun Ravichandran</assignee>
                                    <reporter username="mindaugas.malinauskas@mongodb.com">Mindaugas Malinauskas</reporter>
                        <labels>
                    </labels>
                <created>Tue, 30 Nov 2021 14:59:55 +0000</created>
                <updated>Sun, 29 Oct 2023 21:45:31 +0000</updated>
                            <resolved>Tue, 12 Apr 2022 02:48:01 +0000</resolved>
                                                    <fixVersion>6.0.0-rc0</fixVersion>
                                    <component>Change streams</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4475401" author="xgen-internal-githook" created="Tue, 12 Apr 2022 01:15:33 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Varun Ravichandran&apos;, &apos;email&apos;: &apos;varun.ravichandran@mongodb.com&apos;, &apos;username&apos;: &apos;varunravi98&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61802&quot; title=&quot;Implement pre-image expiration configuration parameter propagation and persistence using Mechanism for Specifying Cluster-Wide Configuration Options&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61802&quot;&gt;&lt;del&gt;SERVER-61802&lt;/del&gt;&lt;/a&gt;: Create changeStreamOptions cluster server parameter&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ceb27a18202caf692f595f978fecc7b416a6f6a2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ceb27a18202caf692f595f978fecc7b416a6f6a2&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1825242">SERVER-58692</issuekey>
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            <issuekey id="2022815">DOCS-15230</issuekey>
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                                                        </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="2025671">SERVER-65676</issuekey>
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                            <customfieldvalue>This PR introduces a new cluster-wide server parameter, which will be the first one supported by the server. The parameter is called changeStreamOptions and will look as follows in 6.0:&lt;br/&gt;
&lt;br/&gt;
changeStreamOptions: {preAndPostImages: {expireAfterSeconds: &amp;lt;&amp;#39;off&amp;#39; | &amp;lt;integer&amp;gt;&amp;gt;}}&lt;br/&gt;
&lt;br/&gt;
By default, changeStreamOptions.preAndPostImages.expireAfterSeconds is &amp;#39;off&amp;#39;, meaning that the pre-image time-based retention policy is not active. It can be set to an integer, which turns on the time-based policy such that pre-images are kept on the server for &amp;#39;expireAfterSeconds&amp;#39; seconds.&lt;br/&gt;
&lt;br/&gt;
Ex: to retain pre-images for change streams for 30 seconds each, invoke setClusterParameter as follows:&lt;br/&gt;
db.runCommand({setClusterParameter: {changeStreamOptions: {preAndPostImages: {expireAfterSeconds: 30}}}})&lt;br/&gt;
This only should be run on a mongos in a sharded cluster or on a replica set primary on a non-sharded replica set. The value will be set cluster-wide.&lt;br/&gt;
&lt;br/&gt;
To retrieve any cluster node&amp;#39;s value for changeStreamOptions, run the following command:&lt;br/&gt;
db.runCommand({getClusterParameter: &amp;quot;changeStreamOptions&amp;quot;})</customfieldvalue>

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