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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-21227] MultiPlanStage::invalidate() should not flag and drop invalidated WorkingSetMembers</title>
                <link>https://jira.mongodb.org/browse/SERVER-21227</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If a result document buffered inside the MultiPlanStage is invalidated by an update or delete during a yield, this result is dropped from the result set and flagged for review by the KeepMutationsStage:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/cbc6a790dc4ac537b071626dff77d0073512690c/src/mongo/db/exec/multi_plan.cpp#L432-L433&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/cbc6a790dc4ac537b071626dff77d0073512690c/src/mongo/db/exec/multi_plan.cpp#L432-L433&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;However, KeepMutationsStage is always below MultiPlanStage in the query execution tree, which means that the flagged results will never get revisited. As a result, these documents will be absent from the result set.&lt;/p&gt;

&lt;p&gt;In general, concurrently modified results may be dropped from the query result set (see the &lt;a href=&quot;https://docs.mongodb.org/manual/faq/concurrency/#what-isolation-guarantees-does-mongodb-provide&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Concurrency FAQ&lt;/a&gt;). However, the system should make a best effort to preserve results. We could do better in this case by simply copying the pre-image of the about-to-be modified document rather than dropping it.&lt;/p&gt;</description>
                <environment></environment>
        <key id="237093">SERVER-21227</key>
            <summary>MultiPlanStage::invalidate() should not flag and drop invalidated WorkingSetMembers</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="9">Done</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Fri, 30 Oct 2015 19:29:16 +0000</created>
                <updated>Tue, 17 Nov 2015 18:34:21 +0000</updated>
                            <resolved>Thu, 5 Nov 2015 20:36:19 +0000</resolved>
                                                    <fixVersion>2.6.12</fixVersion>
                    <fixVersion>3.0.8</fixVersion>
                    <fixVersion>3.2.0-rc3</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>13</watches>
                                                                                                                <comments>
                            <comment id="1082138" author="xgen-internal-githook" created="Fri, 6 Nov 2015 19:31:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21227&quot; title=&quot;MultiPlanStage::invalidate() should not flag and drop invalidated WorkingSetMembers&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21227&quot;&gt;&lt;del&gt;SERVER-21227&lt;/del&gt;&lt;/a&gt; don&apos;t drop invalidated results in the MultiPlanRunner&lt;br/&gt;
Branch: v2.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3bd1d8bb96dae6c780ea451cc1dc60794188a69b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3bd1d8bb96dae6c780ea451cc1dc60794188a69b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1082063" author="xgen-internal-githook" created="Fri, 6 Nov 2015 18:50:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21227&quot; title=&quot;MultiPlanStage::invalidate() should not flag and drop invalidated WorkingSetMembers&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21227&quot;&gt;&lt;del&gt;SERVER-21227&lt;/del&gt;&lt;/a&gt; don&apos;t drop invalidated results in MultiPlanStage or CachedPlanStage&lt;/p&gt;

&lt;p&gt;(cherry picked from commit e70c8cb86571dba41fda10e26a46274fe4d66591)&lt;/p&gt;

&lt;p&gt;Conflicts:&lt;br/&gt;
	src/mongo/db/exec/cached_plan.cpp&lt;br/&gt;
Branch: v3.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e81c8bce740deea291cbcb7f4c0652d0ae6af25e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e81c8bce740deea291cbcb7f4c0652d0ae6af25e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1080996" author="xgen-internal-githook" created="Thu, 5 Nov 2015 20:35:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21227&quot; title=&quot;MultiPlanStage::invalidate() should not flag and drop invalidated WorkingSetMembers&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21227&quot;&gt;&lt;del&gt;SERVER-21227&lt;/del&gt;&lt;/a&gt; don&apos;t drop invalidated results in MultiPlanStage or CachedPlanStage&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e70c8cb86571dba41fda10e26a46274fe4d66591&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e70c8cb86571dba41fda10e26a46274fe4d66591&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="228537">SERVER-20299</issuekey>
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