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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-16742] KEEP_MUTATIONS stage is not needed for storage engines supporting doc-level locking</title>
                <link>https://jira.mongodb.org/browse/SERVER-16742</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When using the MMAP v1 storage engine, query stages in a saved state receive invalidation notifications when documents get updated or deleted. Some stages flag documents that are deleted. The set of flagged documents is then read by the KEEP_MUTATIONS stage, which re-checks these documents against the query and returns them if they still match.&lt;/p&gt;

&lt;p&gt;The invalidation mechanism described above is used only for MMAP v1; query plans running against storage engines such as WiredTiger never receive invalidations and never flag mutated documents for review by the KEEP_MUTATIONS stage. The planner&apos;s analysis phase should only add KEEP_MUTATIONS if the storage engine is MMAP v1.&lt;/p&gt;</description>
                <environment></environment>
        <key id="177255">SERVER-16742</key>
            <summary>KEEP_MUTATIONS stage is not needed for storage engines supporting doc-level locking</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>Tue, 6 Jan 2015 21:37:06 +0000</created>
                <updated>Thu, 15 Jan 2015 16:46:33 +0000</updated>
                            <resolved>Thu, 8 Jan 2015 14:21:14 +0000</resolved>
                                                    <fixVersion>2.8.0-rc5</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="800037" author="xgen-internal-githook" created="Thu, 8 Jan 2015 14:20:36 +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-16742&quot; title=&quot;KEEP_MUTATIONS stage is not needed for storage engines supporting doc-level locking&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16742&quot;&gt;&lt;del&gt;SERVER-16742&lt;/del&gt;&lt;/a&gt; doc-locking storage engines do not need the KEEP_MUTATIONS stage&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0ab4bbc6ac0f299a7ebb5e0c156cdd127e52a349&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0ab4bbc6ac0f299a7ebb5e0c156cdd127e52a349&lt;/a&gt;&lt;/p&gt;</comment>
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