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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-53719] Skip opening storage snapshot for fast count in order to regain 10-15% performance</title>
                <link>https://jira.mongodb.org/browse/SERVER-53719</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;With LFR work, we can now access the CollectionCatalog to fetch a safe-to-use Collection shared_ptr without any lock helper.&lt;/p&gt;

&lt;p&gt;Switching the count cmd generally over to LFR has introduced explicitly opening storage snapshots, rather than implicitly in the storage integration layer when a read is actually requested. Since fast count doesn&apos;t access the storage layer, LFR early opening of storage snapshots is slowing down the operation significantly.&lt;/p&gt;

&lt;p&gt;The storage snapshot is opened via the LFR lock helper, which should be removed.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1587546">SERVER-53719</key>
            <summary>Skip opening storage snapshot for fast count in order to regain 10-15% performance</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="dianna.hohensee@mongodb.com">Dianna Hohensee</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                            <label>execution-product-sync</label>
                            <label>pm-1820</label>
                    </labels>
                <created>Tue, 12 Jan 2021 18:17:01 +0000</created>
                <updated>Thu, 14 Oct 2021 20:48:29 +0000</updated>
                            <resolved>Thu, 14 Oct 2021 20:48:29 +0000</resolved>
                                                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="4097333" author="dianna.hohensee" created="Fri, 1 Oct 2021 18:54:02 +0000"  >&lt;p&gt;So a little more complicated than I realized. Fast count, which goes to the Collection&apos;s in-mem count, and regular count that starts a query, are on the same code path. So I think we just need to distinguish between user requests that will go to Collection and those that will perform a query to get count results. Looking into that..&lt;/p&gt;</comment>
                            <comment id="4005460" author="dianna.hohensee" created="Tue, 17 Aug 2021 22:03:34 +0000"  >&lt;p&gt;I&apos;d like to reconsider this for scheduling, as a quick win.&lt;/p&gt;

&lt;p&gt;I don&apos;t think we need to fiddle with AutoGet helper implementation, I think we just need to remove the AutoGet and fetch a CollectionPtr shared_ptr, which is simple?&lt;/p&gt;</comment>
                            <comment id="3838284" author="geert.bosch" created="Tue, 25 May 2021 16:13:50 +0000"  >&lt;p&gt;Should be unlinked.&lt;/p&gt;</comment>
                            <comment id="3837680" author="dianna.hohensee" created="Tue, 25 May 2021 14:34:38 +0000"  >&lt;p&gt;I don&apos;t know the reason. WT&apos;s changes to provide count (&lt;a href=&quot;https://jira.mongodb.org/browse/WT-7408&quot; title=&quot;API to return row and byte counts for objects and cursor ranges&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-7408&quot;&gt;WT-7408&lt;/a&gt;) could cause us to change the fast count code, but that would be a subsequent SERVER ticket, not a WT ticket. I&apos;m also unaware how that might change locking requirements.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=geert.bosch&quot; class=&quot;user-hover&quot; rel=&quot;geert.bosch&quot;&gt;geert.bosch&lt;/a&gt;, any context for this dependency, or should it be unlinked?&lt;/p&gt;</comment>
                            <comment id="3837619" author="milkie" created="Tue, 25 May 2021 14:28:59 +0000"  >&lt;p&gt;Why does this work depend on &lt;a href=&quot;https://jira.mongodb.org/browse/WT-7408&quot; title=&quot;API to return row and byte counts for objects and cursor ranges&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-7408&quot;&gt;WT-7408&lt;/a&gt;?&lt;/p&gt;</comment>
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