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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-48024] Have validate compare collection object with on-disk metadata object</title>
                <link>https://jira.mongodb.org/browse/SERVER-48024</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Catalog-level data corruption is only detected across restart (or rollback to stable). While a collection validation does read collection and index data from disk, and compares some aggregates to in-memory collection objects (e.g: multikey), the collection object is never checked.&lt;/p&gt;

&lt;p&gt;We should add some basic checks to collection validation. Most importantly, verifying the on-disk document exists. Other possibilities (not all may be possible, particularly for background validation):&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Comparing in-memory multikey values to disk ones&lt;/li&gt;
	&lt;li&gt;collection + index ident mappings&lt;/li&gt;
	&lt;li&gt;UUIDs&lt;/li&gt;
	&lt;li&gt;Namespace value&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;This check will help catch some errors that are currently only observable on tests that intentionally crash/restart, but may be occurring much more frequently, leading to easier reproducers.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1343762">SERVER-48024</key>
            <summary>Have validate compare collection object with on-disk metadata object</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="13202">Works as Designed</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="daniel.gottlieb@mongodb.com">Daniel Gottlieb</reporter>
                        <labels>
                    </labels>
                <created>Thu, 7 May 2020 20:45:02 +0000</created>
                <updated>Fri, 27 Oct 2023 13:52:50 +0000</updated>
                            <resolved>Thu, 25 Jun 2020 18:36:30 +0000</resolved>
                                                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3224460" author="daniel.gottlieb@10gen.com" created="Thu, 25 Jun 2020 18:36:30 +0000"  >&lt;p&gt;I&apos;ll be darned&lt;/p&gt;</comment>
                            <comment id="3224027" author="louis.williams" created="Thu, 25 Jun 2020 15:30:24 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=daniel.gottlieb&quot; class=&quot;user-hover&quot; rel=&quot;daniel.gottlieb&quot;&gt;daniel.gottlieb&lt;/a&gt;, I&apos;m not sure I completely understand the goal of this ticket. We already have checks in validate() that would fail if the entry in the durable catalog is missing. &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a823c69a5dec5e8705bc754038f914e0784d8d09/src/mongo/db/catalog/collection_validation.cpp#L363&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;For example&lt;/a&gt;. Do you mind clarifying what you wanted out of this?&lt;/p&gt;</comment>
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                <issuelinks>
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            <issuekey id="1343348">SERVER-48010</issuekey>
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