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    <title>MongoDB Jira</title>
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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-77103] Cache the APIVersionMetrics::update</title>
                <link>https://jira.mongodb.org/browse/SERVER-77103</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;APIVersionMetrics::update tracks the last used DateTime of a given &amp;lt;Application Name, API Version&amp;gt; pair. For every request, we take a global mutex, do a two level lookup through hash tables and then update a datetime. &lt;/p&gt;

&lt;p&gt;I surmise, that for a given client the pair of &amp;lt;Application Name, API Version&amp;gt; never changes after initial connection. For instance, with non-internal clients, Application Name can only be set on the first &lt;tt&gt;hello&lt;/tt&gt; command. For internal clients (mongos -&amp;gt; mongod), Application Name can be changed but it is unlikely. The API Version likely also does not change during the lifetime of a connection.&lt;/p&gt;

&lt;p&gt;To avoid the two level lookup and global lock, we could cache a handle in mongo::Client to an atomicword for date_t and then reuse that it &amp;lt;Application Name, API Version&amp;gt; has not changed.&lt;/p&gt;

&lt;p&gt;I would expect a small perf benefit by avoiding the lock and lookups.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2340094">SERVER-77103</key>
            <summary>Cache the APIVersionMetrics::update</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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>
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                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="xuerui.fa@mongodb.com">Xuerui Fa</assignee>
                                    <reporter username="mark.benvenuto@mongodb.com">Mark Benvenuto</reporter>
                        <labels>
                    </labels>
                <created>Fri, 12 May 2023 19:41:55 +0000</created>
                <updated>Mon, 14 Aug 2023 21:34:15 +0000</updated>
                            <resolved>Mon, 14 Aug 2023 21:27:22 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>5</watches>
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