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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-40225] Updates to the shard key field of a doc that will remain on the same shard will not error if the shard is in FCV4.2 even if other shards are in FCV4.0</title>
                <link>https://jira.mongodb.org/browse/SERVER-40225</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, if an update to a shard key field will not cause the document to change shards, and this doc lives on a shard in FCV 4.2, the write will not error even if other shards are in FCV 4.0. We should investigate if it is possible to error in this case.&lt;/p&gt;</description>
                <environment></environment>
        <key id="719421">SERVER-40225</key>
            <summary>Updates to the shard key field of a doc that will remain on the same shard will not error if the shard is in FCV4.2 even if other shards are in FCV4.0</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="janna.golden@mongodb.com">Janna Golden</assignee>
                                    <reporter username="janna.golden@mongodb.com">Janna Golden</reporter>
                        <labels>
                    </labels>
                <created>Tue, 19 Mar 2019 20:53:49 +0000</created>
                <updated>Sun, 29 Oct 2023 22:22:49 +0000</updated>
                            <resolved>Tue, 30 Apr 2019 15:19:33 +0000</resolved>
                                                    <fixVersion>4.1.11</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2229238" author="xgen-internal-githook" created="Tue, 30 Apr 2019 15:19:31 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;jannaerin&apos;, &apos;username&apos;: &apos;jannaerin&apos;, &apos;email&apos;: &apos;golden.janna@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40225&quot; title=&quot;Updates to the shard key field of a doc that will remain on the same shard will not error if the shard is in FCV4.2 even if other shards are in FCV4.0&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40225&quot;&gt;&lt;del&gt;SERVER-40225&lt;/del&gt;&lt;/a&gt; Updates to shard key field succeed if stay on shard in FCV 4.2&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/99a234e03c6e63b55e3a35f0bcfa4c6a27cac1f3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/99a234e03c6e63b55e3a35f0bcfa4c6a27cac1f3&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2185896" author="schwerin" created="Wed, 20 Mar 2019 08:36:34 +0000"  >&lt;p&gt;If a 4.0 secondary can process the operation, maybe we don&#8217;t need to prohibit it. FCV is there to prevent data corruption and incorrect results, primarily.&lt;/p&gt;</comment>
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