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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-82865] Lightweight collection acquisition for findOneById</title>
                <link>https://jira.mongodb.org/browse/SERVER-82865</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;PERF-4548 identified AutoGetCollection as one important source for findOneById regressions on 7.0. It&apos;s also one of the largest contributors to latency in absolute terms.&lt;/p&gt;

&lt;p&gt;PERF-4741 created a POC with much simpler logic to acquire a collection for the specific case of findOneById, showing significant improvements for some workloads (e.g. 20% for ycsb_100read on top of PERF-4696). &lt;/p&gt;

&lt;p&gt;The main changes of PERF-4741 are:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Not taking any global locks on the fast path, relying instead on a &quot;hazard-pointer like&quot; mechanism.&lt;/li&gt;
	&lt;li&gt;Doesn&apos;t canonicalize the query.&lt;/li&gt;
	&lt;li&gt;Doesn&apos;t instantiate AutoStatsTracker.&lt;/li&gt;
	&lt;li&gt;Doesn&apos;t take storage tickets on the fast path, it uses a rudimentary rate limiter based on a semaphore, it continues to take locks and tickets on the slow path.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="2492619">SERVER-82865</key>
            <summary>Lightweight collection acquisition for findOneById</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-server-catalog-and-routing">Backlog - Catalog and Routing</assignee>
                                    <reporter username="daniel.gomezferro@mongodb.com">Daniel Gomez Ferro</reporter>
                        <labels>
                            <label>perf-tiger</label>
                            <label>perf-tiger-handoff</label>
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                <created>Tue, 7 Nov 2023 14:44:21 +0000</created>
                <updated>Thu, 30 Nov 2023 11:18:08 +0000</updated>
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