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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-81569] Improve performance of NamespaceString</title>
                <link>https://jira.mongodb.org/browse/SERVER-81569</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The NamespaceString::ConstantProxy and DatabaseName::ConstantProxy classes currently uses std::call_once to provide access to a NamespaceString object; this is done on every access to the NamespaceString constants.  Since std::call_once must do atomic operations, it is fairly expensive, and adds several hundred nanoseconds to opObserver calls just to check that an opObserver shouldn&apos;t run.&lt;/p&gt;

&lt;p&gt;Additionally, before we had tenantId, getting the database for a NamespaceString was a cheap operation that just got a reference; it now requires a copy.  Ideally we would have a DatabaseNameRef class that could be used almost anyplace a DatabaseName is, with DatabaseName reserved for when we need to actually store one.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2454718">SERVER-81569</key>
            <summary>Improve performance of NamespaceString</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="10018" iconUrl="https://jira.mongodb.org/images/icons/statuses/visible.png" description="">In Code Review</status>
                    <statusCategory id="4" key="indeterminate" colorName="inprogress"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="didier.nadeau@mongodb.com">Didier Nadeau</assignee>
                                    <reporter username="matthew.russotto@mongodb.com">Matthew Russotto</reporter>
                        <labels>
                            <label>car-investigation</label>
                            <label>ntdi_performance</label>
                            <label>perf-8.0</label>
                            <label>perf-tiger</label>
                            <label>perf-tiger-handoff</label>
                            <label>perf-tiger-poc</label>
                            <label>perf-tiger-q4</label>
                    </labels>
                <created>Fri, 29 Sep 2023 15:13:46 +0000</created>
                <updated>Tue, 6 Feb 2024 19:04:49 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>8</watches>
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                                        <issuelink>
            <issuekey id="2527871">SERVER-84285</issuekey>
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            <issuelink>
            <issuekey id="2528895">SERVER-84311</issuekey>
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            <issuekey id="2439044">SERVER-80961</issuekey>
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