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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-54742] [4.2] indexes may initialize multikey state from uninitialized value</title>
                <link>https://jira.mongodb.org/browse/SERVER-54742</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;b&gt;This does not affect a released version of 4.2&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;During both startup and index creation, we initialize an index&apos;s multikey state by calling &lt;a href=&quot;https://github.com/mongodb/mongo/blob/16ce9754595d39cd093e2a6adc78366db1d46f2b/src/mongo/db/catalog/index_catalog_entry_impl.cpp#L386-L390&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;_catalogIsMultikey.&lt;/a&gt;&#160;This should initialize directly from the durable catalog, but there is an early-return that checks the _isMultikeyForRead flag first. At this point, _isMultikeyForRead hasn&apos;t been initialized; it gets initialized &lt;a href=&quot;https://github.com/mongodb/mongo/blob/16ce9754595d39cd093e2a6adc78366db1d46f2b/src/mongo/db/catalog/index_catalog_entry_impl.cpp#L78&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;immediately afterward&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;This can cause a bug where an index will not get updated to multikey when it should.&lt;/p&gt;

&lt;p&gt;We should be able to eliminate this early check entirely, which is the case on other branches.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1631257">SERVER-54742</key>
            <summary>[4.2] indexes may initialize multikey state from uninitialized value</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="13203">Gone away</resolution>
                                        <assignee username="louis.williams@mongodb.com">Louis Williams</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                    </labels>
                <created>Wed, 24 Feb 2021 00:10:35 +0000</created>
                <updated>Fri, 27 Oct 2023 20:46:12 +0000</updated>
                            <resolved>Fri, 5 Mar 2021 16:39:09 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3649511" author="connie.chen" created="Fri, 5 Mar 2021 16:39:09 +0000"  >&lt;p&gt;Original change was reverted.&lt;/p&gt;</comment>
                            <comment id="3637678" author="xgen-internal-githook" created="Fri, 26 Feb 2021 19:22:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Louis Williams&apos;, &apos;email&apos;: &apos;louis.williams@mongodb.com&apos;, &apos;username&apos;: &apos;louiswilliams&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54742&quot; title=&quot;[4.2] indexes may initialize multikey state from uninitialized value&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54742&quot;&gt;&lt;del&gt;SERVER-54742&lt;/del&gt;&lt;/a&gt; Initialize IndexCatalogEntry multikey state directly from durable catalog&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 46fc6fb233e85538a94dda6eea91cc2ac34cee15.&lt;/p&gt;

&lt;p&gt;Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47694&quot; title=&quot;fix multikey. again&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47694&quot;&gt;&lt;del&gt;SERVER-47694&lt;/del&gt;&lt;/a&gt;: fix multikey. again&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit ecd41f8b3bfe2154921cbcede9040d535a46e0c5.&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a56afdff77a84c37d6af0ba77e7068a0b5d593c0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a56afdff77a84c37d6af0ba77e7068a0b5d593c0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3632587" author="xgen-internal-githook" created="Wed, 24 Feb 2021 14:53:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Louis Williams&apos;, &apos;email&apos;: &apos;louis.williams@mongodb.com&apos;, &apos;username&apos;: &apos;louiswilliams&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54742&quot; title=&quot;[4.2] indexes may initialize multikey state from uninitialized value&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54742&quot;&gt;&lt;del&gt;SERVER-54742&lt;/del&gt;&lt;/a&gt; Initialize IndexCatalogEntry multikey state directly from durable catalog&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/46fc6fb233e85538a94dda6eea91cc2ac34cee15&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/46fc6fb233e85538a94dda6eea91cc2ac34cee15&lt;/a&gt;&lt;/p&gt;</comment>
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