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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-44247] Rename index &apos;ns&apos; fields on renameCollection when in FCV4.2</title>
                <link>https://jira.mongodb.org/browse/SERVER-44247</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41696&quot; title=&quot;Stop generating the &amp;#39;ns&amp;#39; field for index spec catalog entries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41696&quot;&gt;&lt;del&gt;SERVER-41696&lt;/del&gt;&lt;/a&gt; removes the &apos;ns&apos; field from indexes in 4.4 upgrade and &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41697&quot; title=&quot;Remove the &amp;#39;ns&amp;#39; field from any existing index spec catalog entries during upgrade&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41697&quot;&gt;&lt;del&gt;SERVER-41697&lt;/del&gt;&lt;/a&gt; removed the logic from the latest mongod binary completely for renaming the &apos;ns&apos; field of the index. We should continue to rename the &apos;ns&apos; field of the index when on FCV4.2 or we can fail to startup on downgrade due to this &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f79498e9aa27765fc363fcb85a65f47af6e20ee1/src/mongo/db/catalog/index_catalog_impl.cpp#L348&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;fassert&lt;/a&gt; during startup recovery.&lt;/p&gt;

&lt;p&gt;Steps to reproduce:&lt;br/&gt;
 1. Create a collection db_one on a 4.2 mongod binary&lt;/p&gt;

&lt;p&gt;2 Restart using master binary on FCV4.2 and rename a collection from db_one to db_two&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;The &apos;ns&apos; field of the index will not be renamed&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;3. restart again as a 4.2 binary&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;On startup, we fail to validate the index because the collection name &apos;db_two&apos; does not match the index &apos;ns&apos; field &apos;db_one&apos;&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="979338">SERVER-44247</key>
            <summary>Rename index &apos;ns&apos; fields on renameCollection when in FCV4.2</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="louis.williams@mongodb.com">Louis Williams</assignee>
                                    <reporter username="jason.chan@mongodb.com">Jason Chan</reporter>
                        <labels>
                    </labels>
                <created>Fri, 25 Oct 2019 17:02:51 +0000</created>
                <updated>Sun, 29 Oct 2023 22:15:43 +0000</updated>
                            <resolved>Tue, 3 Dec 2019 17:14:12 +0000</resolved>
                                                    <fixVersion>4.3.3</fixVersion>
                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="2580159" author="xgen-internal-githook" created="Tue, 3 Dec 2019 16:46:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;louis.williams@mongodb.com&apos;, &apos;name&apos;: &apos;Louis Williams&apos;, &apos;username&apos;: &apos;louiswilliams&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44247&quot; title=&quot;Rename index &amp;#39;ns&amp;#39; fields on renameCollection when in FCV4.2&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44247&quot;&gt;&lt;del&gt;SERVER-44247&lt;/del&gt;&lt;/a&gt; Rename index &apos;ns&apos; fields when renaming collections in FCV 4.2&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/39e338fe6fa2205c4321fb447e263f4ba42b5ce1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/39e338fe6fa2205c4321fb447e263f4ba42b5ce1&lt;/a&gt;&lt;/p&gt;</comment>
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