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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-85797] Add a test that diffs IDL files for commands across versions</title>
                <link>https://jira.mongodb.org/browse/SERVER-85797</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We&apos;ve seen a few bugs (example &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-85459&quot; title=&quot;bucketRoundingSeconds param is accepted by nodes on FCV 6.0, binary 7.0&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-85459&quot;&gt;SERVER-85459&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-82201&quot; title=&quot;Avoid fuzzer generating tests with create/collMod commands having &amp;#39;recordPreImages&amp;#39; flag&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82201&quot;&gt;&lt;del&gt;SERVER-82201&lt;/del&gt;&lt;/a&gt;) that show up in mixed binary replica sets where a feature isn&apos;t being checked with an FCV properly. As a result, scenarios where some nodes accept a command while others don&apos;t can occur. For example, the primary on a higher binary version (but low FCV) may incorrectly accept a command with a param that exists only on higher binary versions. As secondaries don&apos;t know how to handle the param during replication, they crash.&lt;/p&gt;

&lt;p&gt;So far the fuzzer has been catching these, like the two tickets listed above. But what would be a quick (rather than eventual), deterministic way to catch these would be to have a test that:&lt;/p&gt;

&lt;p&gt;1. Computes the diff between IDL files across versions, say between 6.0 and 7.0.&lt;br/&gt;
2. If there is a difference, issues commands with the difference included and excluded to a mixed version replica set. This step would have caught the two bugs listed above.&lt;br/&gt;
3. Repeats for every IDL file that defines a command.&lt;/p&gt;

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                <environment></environment>
        <key id="2558679">SERVER-85797</key>
            <summary>Add a test that diffs IDL files for commands across versions</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>Fri, 26 Jan 2024 18:10:49 +0000</created>
                <updated>Mon, 29 Jan 2024 18:05:56 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>4</watches>
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