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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-49012] Background validation needs to use ignore_prepare=false</title>
                <link>https://jira.mongodb.org/browse/SERVER-49012</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, foreground and background validation both use ignore_prepare=true.  This is required for foreground validation not to deadlock on secondaries, and since it holds a strong lock there is no issue with prepared transactions concurrently committing while foreground validation is running.&lt;/p&gt;

&lt;p&gt;For background validation, prepared transactions can commit concurrently when the validation is running. Because snapshot isolation does not apply to prepared transaction writes when a reader is using ignore_prepare=true, the validation can mistakenly report a data corruption problem between indexes and collections updated in the same prepared transaction.  For this reason, we must change ignore_prepare to be false when background validation is running.  This could be problematic, however, since background validation currently stops replication application while it is running, so any encounters with prepare conflicts will cause a deadlock without further code logic changes.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1385976">SERVER-49012</key>
            <summary>Background validation needs to use ignore_prepare=false</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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>
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                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="milkie@mongodb.com">Eric Milkie</assignee>
                                    <reporter username="milkie@mongodb.com">Eric Milkie</reporter>
                        <labels>
                    </labels>
                <created>Mon, 22 Jun 2020 17:08:31 +0000</created>
                <updated>Mon, 15 Feb 2021 00:36:47 +0000</updated>
                            <resolved>Fri, 25 Sep 2020 18:30:48 +0000</resolved>
                                    <version>4.4.0-rc10</version>
                                                    <component>Diagnostics</component>
                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="3418337" author="milkie" created="Wed, 30 Sep 2020 12:58:52 +0000"  >&lt;p&gt;Background validation now indeed does not ignore prepared writes; this code change was committed as part of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47681&quot; title=&quot;Background validation uses the kNoOverlap read source instead of kAllDurableSnapshot to prevent us from having to take the PBWM lock on secondaries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47681&quot;&gt;&lt;del&gt;SERVER-47681&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
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