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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-54890] Disable background validation and dbHash checks on capped collections in 4.4</title>
                <link>https://jira.mongodb.org/browse/SERVER-54890</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Capped collections perform un-timestamped writes to delete expired documents, but all documents will have had an assigned timestamp when first inserted. This breaks contracts with the storage engine regarding mixed-use timestamps and means that point-in-time reads do not work correctly on capped collections.&lt;/p&gt;

&lt;p&gt;As a result, background validation and dbHash will fail with the following errors when reading documents that have just been deleted:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;DataCorruptionDetected: Erroneous index key found with reference to non-existent record id&lt;/li&gt;
	&lt;li&gt;Index with name X has inconsistencies.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;These inconsistencies should be inconsequential because they can only happen when reading documents that have already been deleted.&lt;/p&gt;

&lt;p&gt;We already prohibit the use of readConcern: &apos;snapshot&apos; and multi-document transactions on capped collections for this reason. &lt;/p&gt;</description>
                <environment></environment>
        <key id="1637263">SERVER-54890</key>
            <summary>Disable background validation and dbHash checks on capped collections in 4.4</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="13201">Fixed</resolution>
                                        <assignee username="gregory.wlodarek@mongodb.com">Gregory Wlodarek</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                    </labels>
                <created>Tue, 2 Mar 2021 19:04:49 +0000</created>
                <updated>Sun, 29 Oct 2023 21:56:50 +0000</updated>
                            <resolved>Thu, 13 May 2021 14:27:38 +0000</resolved>
                                                    <fixVersion>4.4.7</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3771563" author="xgen-internal-githook" created="Thu, 13 May 2021 14:24:17 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;, &apos;username&apos;: &apos;GWlodarek&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54890&quot; title=&quot;Disable background validation and dbHash checks on capped collections in 4.4&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54890&quot;&gt;&lt;del&gt;SERVER-54890&lt;/del&gt;&lt;/a&gt; Disable background validation and dbHash checks on capped collections&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d739233ca231e1da70243086e0edc7a9aac7a772&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d739233ca231e1da70243086e0edc7a9aac7a772&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="168240">SERVER-16049</issuekey>
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            <issuekey id="1543403">SERVER-52892</issuekey>
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            <issuelink>
            <issuekey id="1978274">SERVER-63339</issuekey>
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