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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-82119] Add guardrails to prevent incompatibilities between binary versions on the same FCV</title>
                <link>https://jira.mongodb.org/browse/SERVER-82119</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently it&apos;s possible for developers to introduce / remove parameters across binary versions in a way that means behavior will diverge across binary versions, even if the nodes have the same FCV. We should add guardrails to prevent developers from doing this.&lt;/p&gt;

&lt;p&gt;As a concrete example, &lt;tt&gt;recordPreImages&lt;/tt&gt; is an option that is available in &lt;tt&gt;createCollection&lt;/tt&gt; / &lt;tt&gt;collMod&lt;/tt&gt; in 6.0 binaries. It was removed in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-60919&quot; title=&quot;Remove oplog based change stream pre-image storage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60919&quot;&gt;&lt;del&gt;SERVER-60919&lt;/del&gt;&lt;/a&gt; and doesn&apos;t exist on 7.0 binaries.&lt;/p&gt;

&lt;p&gt;However this was implemented in a way so that a primary with FCV 6.0 and binary 6.0 accepts this command:&lt;/p&gt;
&lt;p/&gt;
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&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&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.runCommand({createCollection: &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;coll&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;, recordPreImages: &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;true&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;A primary with FCV 6.0 but binary 7.0 will error on the same command, meaning it diverges from the 6.0 binary.&lt;/p&gt;

&lt;p&gt;There are some more edge cases with undefined behavior that can occur in mixed version replica sets. See the linked BF.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2472717">SERVER-82119</key>
            <summary>Add guardrails to prevent incompatibilities between binary versions on the same FCV</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="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="vishnu.kaushik@mongodb.com">Vishnu Kaushik</reporter>
                        <labels>
                    </labels>
                <created>Thu, 12 Oct 2023 14:32:27 +0000</created>
                <updated>Fri, 26 Jan 2024 18:10:49 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="5782214" author="huayu.ouyang" created="Mon, 16 Oct 2023 18:12:43 +0000"  >&lt;p&gt;potentially running suites that run last-lts tests on a latest binary (ex: 6.0 tests on a 7.0 binary) would catch this&lt;/p&gt;</comment>
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                                            <outwardlinks description="related to">
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            <issuekey id="2558679">SERVER-85797</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="2551389">SERVER-85459</issuekey>
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