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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-20299] Delete KEEP_MUTATIONS stage</title>
                <link>https://jira.mongodb.org/browse/SERVER-20299</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The KEEP_MUTATIONS query execution stage was originally intended to make a best effort at returning concurrently modified documents from queries against a node configured to use the MMAP storage engine. However, the necessity of this stage is dubious. My reading of the implementation is that is is only necessary if buffered documents are concurrently updated during the execution of an index intersection plan.&lt;/p&gt;

&lt;p&gt;Deleting KEEP_MUTATIONS would be welcome code removal that would help to simplify some tricky pieces of the query planner and query execution engine.&lt;/p&gt;</description>
                <environment></environment>
        <key id="228537">SERVER-20299</key>
            <summary>Delete KEEP_MUTATIONS stage</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, 4 Sep 2015 21:40:09 +0000</created>
                <updated>Thu, 2 Aug 2018 13:50:45 +0000</updated>
                            <resolved>Thu, 2 Aug 2018 13:50:45 +0000</resolved>
                                                    <fixVersion>4.1.2</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1963898" author="xgen-internal-githook" created="Thu, 2 Aug 2018 13:48:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;dstorch&apos;, &apos;name&apos;: &apos;David Storch&apos;, &apos;email&apos;: &apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20299&quot; title=&quot;Delete KEEP_MUTATIONS stage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20299&quot;&gt;&lt;del&gt;SERVER-20299&lt;/del&gt;&lt;/a&gt; Remove CANNOT_TRIM_IXISECT parameter.&lt;/p&gt;

&lt;p&gt;With the removal of MMAPv1, this is no longer important.&lt;br/&gt;
This changes the planner to always avoid trimming exact&lt;br/&gt;
predicates for IXISECT plans.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fa888e7c0183debdb0b2b77fc2d55b6cc7238c2d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fa888e7c0183debdb0b2b77fc2d55b6cc7238c2d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1963897" author="xgen-internal-githook" created="Thu, 2 Aug 2018 13:48:38 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;dstorch&apos;, &apos;name&apos;: &apos;David Storch&apos;, &apos;email&apos;: &apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20299&quot; title=&quot;Delete KEEP_MUTATIONS stage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20299&quot;&gt;&lt;del&gt;SERVER-20299&lt;/del&gt;&lt;/a&gt; Delete KEEP_MUTATIONS stage.&lt;/p&gt;

&lt;p&gt;Removes the associated flagForReview() mechanism from&lt;br/&gt;
WorkingSet.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/51589a332a0e557b6080f38dc605e2e2fa3740b6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/51589a332a0e557b6080f38dc605e2e2fa3740b6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1913146" author="david.storch" created="Wed, 6 Jun 2018 22:31:08 +0000"  >&lt;p&gt;Re-opening this issue. The &lt;tt&gt;KEEP_MUTATIONS&lt;/tt&gt; stage is only needed for the MMAPv1 storage engine, and it should be deleted once we no longer support MMAPv1.&lt;/p&gt;</comment>
                            <comment id="1129162" author="david.storch" created="Thu, 7 Jan 2016 22:06:35 +0000"  >&lt;p&gt;After further discussion, we are closing this ticket as Won&apos;t Fix. There is a legitimate purpose for KEEP_MUTATIONS to support the execution of the index intersection PlanStages. Unnecessary uses of KEEP_MUTATIONS have already been removed. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15962&quot; title=&quot;Planner should only add KEEP_MUTATIONS for plans that might flag invalidated results&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15962&quot;&gt;&lt;del&gt;SERVER-15962&lt;/del&gt;&lt;/a&gt; will involve further cleanup work in this area.&lt;/p&gt;</comment>
                    </comments>
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                                            <outwardlinks description="depends on">
                                        <issuelink>
            <issuekey id="547084">SERVER-35112</issuekey>
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                                        <issuelink>
            <issuekey id="167395">SERVER-15962</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="237093">SERVER-21227</issuekey>
        </issuelink>
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            <issuekey id="178791">SERVER-16857</issuekey>
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