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            <title>[SERVER-85137] Investigate having queries preemptively copy from the storage engine before a yield</title>
                <link>https://jira.mongodb.org/browse/SERVER-85137</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;With the &quot;new yielding&quot; behavior, the query system will not reset its storage cursors across getMores or yields, forcing the storage engine to &quot;pin&quot; the data these cursors are positioned at. This resulted in some performance regressions, explained in BF-24012.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/10gen/mongo/pull/2790&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Here is a POC&lt;/a&gt; of the idea to have the query system preemptively copy data when it is known that either yield or a command will call saveState() momentarily.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1967799">SERVER-85137</key>
            <summary>Investigate having queries preemptively copy from the storage engine before a yield</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>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Done</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="ian.boros@mongodb.com">Ian Boros</reporter>
                        <labels>
                    </labels>
                <created>Thu, 20 Jan 2022 20:49:49 +0000</created>
                <updated>Sat, 13 Jan 2024 01:02:15 +0000</updated>
                            <resolved>Fri, 22 Jul 2022 20:26:57 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="4699144" author="dianna.hohensee" created="Fri, 22 Jul 2022 20:26:57 +0000"  >&lt;p&gt;This is finished. Investigation was done, and &lt;a href=&quot;https://jira.mongodb.org/browse/WT-8707&quot; title=&quot;Mongod reader yielding with WT::commit_transaction instead of rollback pins WT pages such that pages cannot be split/evicted by writer threads&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-8707&quot;&gt;&lt;del&gt;WT-8707&lt;/del&gt;&lt;/a&gt; tracked the continued work.&lt;/p&gt;</comment>
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