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    <title>MongoDB Jira</title>
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    <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-52894] Why is the change stream feature supported only on replica sets?</title>
                <link>https://jira.mongodb.org/browse/SERVER-52894</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As a user (via the NodeJS driver) unfamiliar with Mongo internals, I have tried using the change stream feature but received an error: &quot;The $changeStream stage is only supported on replica sets&quot;.&lt;/p&gt;

&lt;p&gt;Why is this the expected result? Why is replication needed in order to be able to subscribe to changes to a collection and/or it&apos;s document(s)?&lt;/p&gt;</description>
                <environment></environment>
        <key id="1543428">SERVER-52894</key>
            <summary>Why is the change stream feature supported only on replica sets?</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="edwin.zhou@mongodb.com">Edwin Zhou</assignee>
                                    <reporter username="soryy708@gmail.com">Ivan Rubinson</reporter>
                        <labels>
                    </labels>
                <created>Mon, 16 Nov 2020 20:41:09 +0000</created>
                <updated>Wed, 18 Nov 2020 21:48:48 +0000</updated>
                            <resolved>Wed, 18 Nov 2020 21:48:03 +0000</resolved>
                                    <version>4.4.0</version>
                                                    <component>Aggregation Framework</component>
                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3496673" author="JIRAUSER1257066" created="Wed, 18 Nov 2020 21:47:25 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=soryy708%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;soryy708@gmail.com&quot;&gt;soryy708@gmail.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://docs.mongodb.com/manual/changeStreams/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;changeStream remedies the complexity and risk caused by tracking the oplog for changes in data&lt;/a&gt;. Using changeStream requires a replica set because it depends on an oplog, which standalone mongod instances don&apos;t have. As a workaround, you can &lt;a href=&quot;https://docs.mongodb.com/manual/tutorial/convert-standalone-to-replica-set/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;convert the instance to a single node replica set&lt;/a&gt;, which would generate an oplog and attempt to use changeStream again.&lt;/p&gt;

&lt;p&gt;Let me know if this helps.&lt;/p&gt;

&lt;p&gt;Best,&lt;/p&gt;

&lt;p&gt;Edwin&lt;/p&gt;</comment>
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