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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-80859] Reshuffle UpdateStage/DeleteStage&apos;s logic to skip restore</title>
                <link>https://jira.mongodb.org/browse/SERVER-80859</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-78470&quot; title=&quot;Prevent multi-false UpdateStage/DeleteStage from provoking yield after having already written &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-78470&quot;&gt;&lt;del&gt;SERVER-78470&lt;/del&gt;&lt;/a&gt; introduced this condition to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2501fcc73505f83a13f2b178d11b221b0c6c68d0/src/mongo/db/exec/update_stage.cpp#L578&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;skip restoring children&lt;/a&gt; stages when Update/DeleteStages are already EOF. This appears to have caused a significant performance regression on some workloads. &lt;/p&gt;

&lt;p&gt;Performance patches have shown that restoring children unconditionally but allowing failures to restore in the cases where it is not necessary resolves the performance regression, while keeping the same semantics required for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-78470&quot; title=&quot;Prevent multi-false UpdateStage/DeleteStage from provoking yield after having already written &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-78470&quot;&gt;&lt;del&gt;SERVER-78470&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2436554">SERVER-80859</key>
            <summary>Reshuffle UpdateStage/DeleteStage&apos;s logic to skip restore</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="13201">Fixed</resolution>
                                        <assignee username="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</assignee>
                                    <reporter username="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</reporter>
                        <labels>
                    </labels>
                <created>Thu, 7 Sep 2023 15:17:32 +0000</created>
                <updated>Sun, 29 Oct 2023 21:16:38 +0000</updated>
                            <resolved>Wed, 20 Sep 2023 14:27:45 +0000</resolved>
                                                    <fixVersion>7.2.0-rc0</fixVersion>
                    <fixVersion>7.1.0-rc4</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5728342" author="xgen-internal-githook" created="Mon, 25 Sep 2023 15:31:26 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Serra Torrens&apos;, &apos;email&apos;: &apos;jordi.serra-torrens@mongodb.com&apos;, &apos;username&apos;: &apos;jordist&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80859&quot; title=&quot;Reshuffle UpdateStage/DeleteStage&amp;#39;s logic to skip restore&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80859&quot;&gt;&lt;del&gt;SERVER-80859&lt;/del&gt;&lt;/a&gt; Reshuffle UpdateStage/DeleteStage&apos;s logic to skip restore&lt;br/&gt;
Branch: v7.1&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d81bcfcd4acb35a78c91466620ec150d213dc46f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d81bcfcd4acb35a78c91466620ec150d213dc46f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5715721" author="xgen-internal-githook" created="Tue, 19 Sep 2023 17:38:17 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Serra Torrens&apos;, &apos;email&apos;: &apos;jordi.serra-torrens@mongodb.com&apos;, &apos;username&apos;: &apos;jordist&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80859&quot; title=&quot;Reshuffle UpdateStage/DeleteStage&amp;#39;s logic to skip restore&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80859&quot;&gt;&lt;del&gt;SERVER-80859&lt;/del&gt;&lt;/a&gt; Reshuffle UpdateStage/DeleteStage&apos;s logic to skip restore&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bf35911f01b092c04b8060738829bf3a7a7ee776&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bf35911f01b092c04b8060738829bf3a7a7ee776&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5711800" author="xgen-internal-githook" created="Mon, 18 Sep 2023 15:46:52 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Serra Torrens&apos;, &apos;email&apos;: &apos;jordi.serra-torrens@mongodb.com&apos;, &apos;username&apos;: &apos;jordist&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80859&quot; title=&quot;Reshuffle UpdateStage/DeleteStage&amp;#39;s logic to skip restore&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80859&quot;&gt;&lt;del&gt;SERVER-80859&lt;/del&gt;&lt;/a&gt; Reshuffle UpdateStage/DeleteStage&apos;s logic to skip restore&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 7faae75bb320dac7a143ae890be6b33a3f8e0639.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/19c84d23e4a9ed23ec6d293545fbfa0ff127fa46&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/19c84d23e4a9ed23ec6d293545fbfa0ff127fa46&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5708228" author="xgen-internal-githook" created="Fri, 15 Sep 2023 18:51:29 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Serra Torrens&apos;, &apos;email&apos;: &apos;jordi.serra-torrens@mongodb.com&apos;, &apos;username&apos;: &apos;jordist&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80859&quot; title=&quot;Reshuffle UpdateStage/DeleteStage&amp;#39;s logic to skip restore&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80859&quot;&gt;&lt;del&gt;SERVER-80859&lt;/del&gt;&lt;/a&gt; Reshuffle UpdateStage/DeleteStage&apos;s logic to skip restore&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7faae75bb320dac7a143ae890be6b33a3f8e0639&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7faae75bb320dac7a143ae890be6b33a3f8e0639&lt;/a&gt;&lt;/p&gt;</comment>
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