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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-68493] Investigate and document the existing infrastructure supporting the Change Stream functionality</title>
                <link>https://jira.mongodb.org/browse/SERVER-68493</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As part of the &lt;a href=&quot;https://docs.google.com/document/d/1BWElA2_AUH5Wupjnr1igYMZflQTRmuszoNh2T6NAqwY/edit#&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;proposed design&lt;/a&gt; for PM-1939 we intend to generate System Change Stream events in correspondence with Sharding DDL operations that alter the subset of Shards containing at lest one chunk of the namespace targeted by a &lt;tt&gt;nss.watch()&lt;/tt&gt; command.&lt;/p&gt;

&lt;p&gt;Some of the desired change stream events (such as &lt;tt&gt;migrateChunkToNewShard&lt;/tt&gt; and &lt;tt&gt;migrateLastChunkFromShard&lt;/tt&gt;) are already being generated by the Server code to support C2C replication.&lt;/p&gt;

&lt;p&gt;The objectives of this ticket are:&lt;/p&gt;

&lt;p&gt;1. collect information on&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;where and how this events are being generated&lt;/li&gt;
	&lt;li&gt;where and how this events are being consumed&lt;/li&gt;
	&lt;li&gt;which is the logic supporting the propagation of the events&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;2. confirm that the existing code can be easily leveraged/extended to other DDL operations&lt;/p&gt;

&lt;p&gt;3. update the &quot;Following the execution&quot; section of the Design document based on the outcome of the investigation&lt;/p&gt;</description>
                <environment></environment>
        <key id="2104472">SERVER-68493</key>
            <summary>Investigate and document the existing infrastructure supporting the Change Stream functionality</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</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="9">Done</resolution>
                                        <assignee username="enrico.golfieri@mongodb.com">Enrico Golfieri</assignee>
                                    <reporter username="paolo.polato@mongodb.com">Paolo Polato</reporter>
                        <labels>
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                <created>Tue, 2 Aug 2022 13:39:59 +0000</created>
                <updated>Tue, 9 Aug 2022 15:58:50 +0000</updated>
                            <resolved>Tue, 9 Aug 2022 15:58:50 +0000</resolved>
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