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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-51420] Deletes read the document twice before deleting</title>
                <link>https://jira.mongodb.org/browse/SERVER-51420</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When deleting a document, we perform two reads (and thus make two copies) of the document before actually deleting it.&lt;/p&gt;

&lt;p&gt;At least one document read is required to generate the keys to delete index entries, but this path&#160;could be optimized to only perform one read.&lt;/p&gt;

&lt;p&gt;The first read can happen in either the IXSCAN+FETCH or COLLSCAN stages. The document is then passed to the WorkingSet.&lt;/p&gt;

&lt;p&gt;The second read happens in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f2e142b467030c1130899408c5697954077cc56b/src/mongo/db/catalog/collection_impl.cpp#L753&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Collection::deleteDocument&lt;/a&gt;. This second read is not technically required because &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f2e142b467030c1130899408c5697954077cc56b/src/mongo/db/exec/delete.cpp#L195&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;at the point where we delete&lt;/a&gt; the document, we already have a version of the document from the WorkingSet.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1506008">SERVER-51420</key>
            <summary>Deletes read the document twice before deleting</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="13201">Fixed</resolution>
                                        <assignee username="brian.deleonardis@mongodb.com">Brian DeLeonardis</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                    </labels>
                <created>Wed, 7 Oct 2020 19:29:53 +0000</created>
                <updated>Sun, 29 Oct 2023 22:02:13 +0000</updated>
                            <resolved>Fri, 6 Nov 2020 21:11:03 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="3480202" author="xgen-internal-githook" created="Fri, 6 Nov 2020 20:36:33 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Brian DeLeonardis&apos;, &apos;email&apos;: &apos;brian.deleonardis@mongodb.com&apos;, &apos;username&apos;: &apos;bdeleonardis1&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-51420&quot; title=&quot;Deletes read the document twice before deleting&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51420&quot;&gt;&lt;del&gt;SERVER-51420&lt;/del&gt;&lt;/a&gt; Optimize delete to only read document once&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cb016ca64de26c7c45854f22e8772937475771e3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cb016ca64de26c7c45854f22e8772937475771e3&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3474105" author="brian.deleonardis" created="Tue, 3 Nov 2020 17:29:02 +0000"  >&lt;p&gt;Code review: &lt;a href=&quot;https://mongodbcr.appspot.com/714480001/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://mongodbcr.appspot.com/714480001/&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3466874" author="louis.williams" created="Wed, 28 Oct 2020 19:05:26 +0000"  >&lt;p&gt;I think the solution should be to create a version of deleteDocument that takes a BSONObj, and have the DeleteStage use it.&lt;/p&gt;</comment>
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