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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-10943] Disallow 3.6 query features in view definitions when featureCompatibilityVersion=3.4 (SERVER-31346)</title>
                <link>https://jira.mongodb.org/browse/DOCS-10943</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h1&gt;&lt;a name=&quot;DocumentationRequestSummary%3A&quot;&gt;&lt;/a&gt;Documentation Request Summary: &lt;/h1&gt;

&lt;p&gt;We may want to add to our 3.6 featureCompatibility documentation instructions to remove views that contain 3.6 query features. You can run a 3.4 binary with these views, but any reads against them will fail.&lt;/p&gt;

&lt;h1&gt;&lt;a name=&quot;EngineeringTicketDescription%3A&quot;&gt;&lt;/a&gt;Engineering Ticket Description:&lt;/h1&gt;

&lt;p&gt;When the &lt;tt&gt;featureCompatibilityVersion&lt;/tt&gt; is 3.4, users should not be able to create a view that includes &lt;tt&gt;$expr&lt;/tt&gt; or &lt;tt&gt;$jsonSchema&lt;/tt&gt; in the &lt;tt&gt;$match&lt;/tt&gt; stage. Disallowing this will prevent 3.4 secondaries from fasserting when replicating &lt;tt&gt;system.views&lt;/tt&gt; and ensure that it is possible to downgrade to 3.4 as long as you have never set the &lt;tt&gt;featureCompatibilityVersion&lt;/tt&gt; to 3.6.&lt;/p&gt;</description>
                <environment>&lt;a href=&quot;https://docs.mongodb.com/master/reference/command/setFeatureCompatibilityVersion/&quot;&gt;https://docs.mongodb.com/master/reference/command/setFeatureCompatibilityVersion/&lt;/a&gt;</environment>
        <key id="450377">DOCS-10943</key>
            <summary>Disallow 3.6 query features in view definitions when featureCompatibilityVersion=3.4 (SERVER-31346)</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>
                            <label>read-only-views</label>
                    </labels>
                <created>Wed, 25 Oct 2017 03:45:42 +0000</created>
                <updated>Sun, 29 Oct 2023 13:58:54 +0000</updated>
                            <resolved>Thu, 30 Nov 2017 05:43:46 +0000</resolved>
                                                    <fixVersion>3.6.0-rc1</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1738143" author="kay.kim@10gen.com" created="Thu, 30 Nov 2017 05:43:46 +0000"  >&lt;p&gt;We already covered this in our downgrade instructions:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://docs.mongodb.com/master/release-notes/3.6-downgrade-standalone/#remove-backwards-incompatible-persisted-features&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/master/release-notes/3.6-downgrade-standalone/#remove-backwards-incompatible-persisted-features&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://docs.mongodb.com/master/release-notes/3.6-downgrade-replica-set/#remove-backwards-incompatible-persisted-features&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/master/release-notes/3.6-downgrade-replica-set/#remove-backwards-incompatible-persisted-features&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://docs.mongodb.com/master/release-notes/3.6-downgrade-sharded-cluster/#remove-backwards-incompatible-persisted-features&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/master/release-notes/3.6-downgrade-sharded-cluster/#remove-backwards-incompatible-persisted-features&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;I just blurbed that on the setFcv page, that if downgrading, you must also remove the persisted features and refer them back to the downgrade page.&lt;/p&gt;</comment>
                            <comment id="1738142" author="xgen-internal-githook" created="Thu, 30 Nov 2017 05:43:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;kay&apos;, &apos;username&apos;: &apos;kay-kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-11071&quot; title=&quot;RelNotes and Compatibility cleanup&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-11071&quot;&gt;&lt;del&gt;DOCS-11071&lt;/del&gt;&lt;/a&gt;,&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-10943&quot; title=&quot;Disallow 3.6 query features in view definitions when featureCompatibilityVersion=3.4 (SERVER-31346)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-10943&quot;&gt;&lt;del&gt;DOCS-10943&lt;/del&gt;&lt;/a&gt; relnotes cleanup and singlesource fcv=3.4 cleanup&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/d9ae0cbd7da1d7f630ba04439a4eff506f502f7a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/d9ae0cbd7da1d7f630ba04439a4eff506f502f7a&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="438370">SERVER-31346</issuekey>
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