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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-36381] Serialize $out to old format if featureCompatibilityVersion is &quot;4.0&quot;</title>
                <link>https://jira.mongodb.org/browse/SERVER-36381</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;By &quot;old format&quot;, I mean the format described &lt;a href=&quot;https://docs.mongodb.com/v4.0/reference/operator/aggregation/out/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;, where only a string with the name of the output collection is specified. This allows a binary version 4.2 &lt;tt&gt;mongod&lt;/tt&gt; to play nicely with binary version 4.0 &lt;tt&gt;mongod&lt;/tt&gt; servers in a mixed-version cluster. If any 4.2-only options are specified, an error should be thrown.&lt;/p&gt;

&lt;p&gt;As part of this ticket, we&apos;ll write tests for $out in the multiversion suite.&lt;/p&gt;</description>
                <environment></environment>
        <key id="580433">SERVER-36381</key>
            <summary>Serialize $out to old format if featureCompatibilityVersion is &quot;4.0&quot;</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="charlie.swanson@mongodb.com">Charlie Swanson</assignee>
                                    <reporter username="kyle.suarez@mongodb.com">Kyle Suarez</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Tue, 31 Jul 2018 19:16:55 +0000</created>
                <updated>Sun, 29 Oct 2023 22:29:24 +0000</updated>
                            <resolved>Thu, 30 Aug 2018 19:48:25 +0000</resolved>
                                                    <fixVersion>4.1.3</fixVersion>
                                    <component>Aggregation Framework</component>
                    <component>Upgrade/Downgrade</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1990333" author="kyle.suarez" created="Thu, 30 Aug 2018 20:04:34 +0000"  >&lt;p&gt;We just wanted to point out that unlike what we initially mentioned in the design, we &lt;b&gt;do not&lt;/b&gt; have to perform a featureCompatibilityVersion check when serializing $out. The only time this would matter is during mongos serialization of a sharded $out aggregation, but our recommended practice is to &lt;a href=&quot;https://docs.mongodb.com/manual/tutorial/upgrade-revision/#upgrade-sharded-clusters&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;upgrade the mongos last when upgrading a sharded cluster&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="1990314" author="xgen-internal-githook" created="Thu, 30 Aug 2018 19:45:31 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Charlie Swanson&apos;, &apos;email&apos;: &apos;charlie.swanson@mongodb.com&apos;, &apos;username&apos;: &apos;cswanson310&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36381&quot; title=&quot;Serialize $out to old format if featureCompatibilityVersion is &amp;quot;4.0&amp;quot;&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36381&quot;&gt;&lt;del&gt;SERVER-36381&lt;/del&gt;&lt;/a&gt; Test using $out during upgrade of a cluster&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6264c1e97b3fde5277450bdf2d285f2dfd868242&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6264c1e97b3fde5277450bdf2d285f2dfd868242&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="597436">SERVER-36930</issuekey>
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