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    <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-78013] Clean-up the use of empty DocumentStorage</title>
                <link>https://jira.mongodb.org/browse/SERVER-78013</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;tt&gt;DocumentStorage&lt;/tt&gt; class offers a public &lt;tt&gt;static const DocumentStorage&amp;amp; DocumentStorage::emptyDoc()&lt;/tt&gt;&#160;method which returns a reference to a global private &lt;tt&gt;static const DocumentStorage::DocumentStorage kEmptyDoc&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;This public method is only used in private &lt;tt&gt;const DocumentStorage&amp;amp; Document::storage()&lt;/tt&gt;, which returns a reference to the same global variable for all documents with empty storage pointer. IMHO, the whole thing should be avoided, unless there are some measurable benefits (e.g., performance).&lt;/p&gt;

&lt;p&gt;As an additional complication, the way the global variable is initialized exposes it to the theoretically possible &quot;static initialization order fiasco&quot;. &lt;/p&gt;

&lt;p&gt;As an additional complication, &lt;tt&gt;class DocumentStorage&lt;/tt&gt; contains mutable data members (and data members modified with const_cast), which increases the chance of having a data race.&lt;/p&gt;

&lt;p&gt;Moreover, &lt;tt&gt;Document::_storage&lt;/tt&gt; is already an (intrusive) pointer, why to have and additional &lt;tt&gt;storage()&lt;/tt&gt;&#160;method instead of pointing to the empty storage directly?&lt;/p&gt;</description>
                <environment></environment>
        <key id="2366119">SERVER-78013</key>
            <summary>Clean-up the use of empty DocumentStorage</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="romans.kasperovics@mongodb.com">Romans Kasperovics</reporter>
                        <labels>
                            <label>neweng</label>
                            <label>quick-tech-debt</label>
                    </labels>
                <created>Mon, 12 Jun 2023 22:01:52 +0000</created>
                <updated>Wed, 14 Jun 2023 17:09:16 +0000</updated>
                                                                            <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
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