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    <title>MongoDB Jira</title>
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    <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-69362] Investigate if we can avoid save/restore in UpdateStage</title>
                <link>https://jira.mongodb.org/browse/SERVER-69362</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Right now in UpdateStage we perform a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/ce3443291cd663ae5375941f380d4bc52bc88a85/src/mongo/db/exec/update_stage.cpp#L520&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;PlanStage::saveState&lt;/a&gt; before making changes and a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/ce3443291cd663ae5375941f380d4bc52bc88a85/src/mongo/db/exec/update_stage.cpp#L592&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;PlanStage::restoreState&lt;/a&gt; afterwards. These operations can potentially be expensive and costly.&lt;/p&gt;

&lt;p&gt;We should investigate whether we can omit them in some cases. If not, then we should leave a comment explaining why we can&apos;t do that as it is not clear why they are needed.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2127326">SERVER-69362</key>
            <summary>Investigate if we can avoid save/restore in UpdateStage</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="jordi.olivares-provencio@mongodb.com">Jordi Olivares Provencio</reporter>
                        <labels>
                            <label>query-perf-candidate</label>
                    </labels>
                <created>Thu, 1 Sep 2022 13:29:24 +0000</created>
                <updated>Tue, 9 May 2023 14:16:05 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="5373819" author="kyle.suarez" created="Tue, 25 Apr 2023 14:43:53 +0000"  >&lt;p&gt;Since Storage Execution kicked this to Query Execution, I&apos;m going to send this to the triage queue and remove it from the &quot;7.1 Desired StorEx Tickets&quot; project. &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jordi.olivares-provencio%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;jordi.olivares-provencio@mongodb.com&quot;&gt;jordi.olivares-provencio@mongodb.com&lt;/a&gt; / &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=louis.williams%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;louis.williams@mongodb.com&quot;&gt;louis.williams@mongodb.com&lt;/a&gt; / &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=henrik.edin%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;henrik.edin@mongodb.com&quot;&gt;henrik.edin@mongodb.com&lt;/a&gt; let us know if this was needed or depended on by something else in 7.1.&lt;/p&gt;</comment>
                            <comment id="4812110" author="louis.williams" created="Thu, 8 Sep 2022 15:55:51 +0000"  >&lt;p&gt;I believe this ticket was filed to address the performance cost of calling restoreState() unnecessarily when updating a single document.&lt;/p&gt;</comment>
                            <comment id="4801863" author="josef.ahmad" created="Mon, 5 Sep 2022 08:01:01 +0000"  >&lt;p&gt;Alternatively we could batch multiple update operations together and considerably reduce the volume of saveState/restoreState. We&apos;ve done something similar in the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d1f935358d6f31c972c5a717b3bbc994b258d2d3/src/mongo/db/exec/batched_delete_stage.cpp&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;BATCHED_DELETE stage&lt;/a&gt;.&lt;/p&gt;</comment>
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