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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>[DOCS-12423] Docs for SERVER-37786: Reject change streams which modify or project-out the resume token</title>
                <link>https://jira.mongodb.org/browse/DOCS-12423</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;
&lt;blockquote&gt;
&lt;h3&gt;&lt;a name=&quot;Description%3A&quot;&gt;&lt;/a&gt;Description: &lt;/h3&gt;

&lt;p&gt;As of this commit, any &lt;tt&gt;$changeStream&lt;/tt&gt; pipeline that either removes or modifies the &lt;tt&gt;_id&lt;/tt&gt; field will fail with an exception. This is because the &lt;tt&gt;_id&lt;/tt&gt; field of each &lt;tt&gt;$changeStream&lt;/tt&gt; event contains the resume token for that event; if it is modified or removed, then it becomes impossible to resume the stream from that point.&lt;/p&gt;

&lt;h3&gt;&lt;a name=&quot;EngineeringTicketDescription%3A&quot;&gt;&lt;/a&gt;Engineering Ticket Description:&lt;/h3&gt;

&lt;p&gt;For example, this pipeline:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.x.watch([{$replaceRoot: {newRoot: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;$fullDocument&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;}}])&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;Such a pipeline is incompatible with the drivers protocol, and will fail to resume in the face of a network outage. It is not intended to be supported, so we should ban it to provide a more predictable failure scenario. Now that we have completed &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35904&quot; title=&quot;Implement logic to detect if merging half of pipeline conserves but possibly renames the shard key&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35904&quot;&gt;&lt;del&gt;SERVER-35904&lt;/del&gt;&lt;/a&gt;, it shouldn&apos;t be very difficult to verify the _id is preserved by the pipeline.&lt;/p&gt;&lt;/blockquote&gt;

&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="683279">DOCS-12423</key>
            <summary>Docs for SERVER-37786: Reject change streams which modify or project-out the resume token</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="13201">Fixed</resolution>
                                        <assignee username="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="kay.kim@mongodb.com">Kay Kim</reporter>
                        <labels>
                    </labels>
                <created>Mon, 4 Feb 2019 16:53:48 +0000</created>
                <updated>Mon, 13 Nov 2023 18:25:50 +0000</updated>
                            <resolved>Thu, 20 Jun 2019 14:30:56 +0000</resolved>
                                                    <fixVersion>4.1.8</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2291329" author="xgen-internal-githook" created="Thu, 20 Jun 2019 14:29:46 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12423&quot; title=&quot;Docs for SERVER-37786: Reject change streams which modify or project-out the resume token&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12423&quot;&gt;&lt;del&gt;DOCS-12423&lt;/del&gt;&lt;/a&gt;: 4.2 change stream and resume token&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/7dbdb16fe10d89982cdb078c7fcb8ba3bb44416f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/7dbdb16fe10d89982cdb078c7fcb8ba3bb44416f&lt;/a&gt;&lt;/p&gt;</comment>
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