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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-51133] $indexStats should consider index visibility in relation to its snapshot</title>
                <link>https://jira.mongodb.org/browse/SERVER-51133</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;$indexStats may read at a point in time where it observes an index completed in the CollectionIndexUsageTracker (in-memory), but whose durable catalog information is not visible in the current snapshot.&lt;/p&gt;

&lt;p&gt;As of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47866&quot; title=&quot;Secondary readers do not need to reacquire PBWM lock if there are catalog conflicts&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47866&quot;&gt;&lt;del&gt;SERVER-47866&lt;/del&gt;&lt;/a&gt;, $indexStats needs to consider each index&apos;s visibility, because it is no longer protected from AutoGetCollectionForRead.&lt;/p&gt;

&lt;p&gt;I see a few options:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Don&apos;t report indexes that have a minimumVisibleSnapshot higher than the current read timestamp. Since we setMinimumVisibleSnapshot at the begin and end of an index build, this would fail to report just-completed indexes that otherwise should be seen as in-progress.&lt;/li&gt;
	&lt;li&gt;Create a helpers &lt;tt&gt;IndexCatalogEntry::isPresentInMySnapshot()&lt;/tt&gt; and &lt;tt&gt;IndexCatalogEntry::isReadyInMySnapshot()&lt;/tt&gt; that are renamed from the existing &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1e43514cb2b05c27d83fe2f2d6d11ab2a25f5506/src/mongo/db/catalog/index_catalog_entry_impl.cpp#L328-L334&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;_catalogIsPresent and _catalogIsReady&lt;/a&gt; functions. This should allow us to preserve the same behavior and without relying on minimumVisibleSnapshot&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Note: the reason why &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1e43514cb2b05c27d83fe2f2d6d11ab2a25f5506/src/mongo/db/pipeline/process_interface/common_mongod_process_interface.cpp#L198&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the current isReady() check&lt;/a&gt; is not sufficient is because of &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1e43514cb2b05c27d83fe2f2d6d11ab2a25f5506/src/mongo/db/catalog/index_catalog_entry_impl.cpp#L142&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this debug check&lt;/a&gt; which does not fail, but will trigger a different invariant in the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1e43514cb2b05c27d83fe2f2d6d11ab2a25f5506/src/mongo/db/storage/durable_catalog_impl.cpp#L1219-L1221&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;DurableCatalog::isIndexReady&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1487233">SERVER-51133</key>
            <summary>$indexStats should consider index visibility in relation to its snapshot</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="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                    </labels>
                <created>Thu, 24 Sep 2020 17:01:03 +0000</created>
                <updated>Sun, 29 Oct 2023 22:02:48 +0000</updated>
                            <resolved>Fri, 9 Oct 2020 13:47:04 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3435735" author="xgen-internal-githook" created="Thu, 8 Oct 2020 22:36:02 +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-51133&quot; title=&quot;$indexStats should consider index visibility in relation to its snapshot&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51133&quot;&gt;&lt;del&gt;SERVER-51133&lt;/del&gt;&lt;/a&gt; should consider index visibility in relation to its snapshot&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0d13febec4de6bf6db0aa875ad74b93070cc4ed4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0d13febec4de6bf6db0aa875ad74b93070cc4ed4&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1521278">SERVER-51794</issuekey>
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