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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-6183] count may not yield before paging in initial candidate documents</title>
                <link>https://jira.mongodb.org/browse/SERVER-6183</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Current behavior of count is to construct a ClientCursor and perform non in mem yielding only after an elapsed tracker has elapsed.  But this means it may hold a read lock while initial candidate documents are paged in.&lt;/p&gt;

&lt;p/&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                    if ( timeToStartYielding.intervalHasElapsed() ) {&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                        // Lazily construct a ClientCursor, avoiding a performance regression when scanning a very&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                        // small number of documents.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                        ccPointer.reset( new ClientCursor( QueryOption_NoCursorTimeout, cursor, ns ) );&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;In 2.0 count did not have non in mem yielding, so current behavior does improve on that.&lt;/p&gt;</description>
                <environment></environment>
        <key id="42176">SERVER-6183</key>
            <summary>count may not yield before paging in initial candidate documents</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="aaron">Aaron Staple</reporter>
                        <labels>
                            <label>query_triage</label>
                    </labels>
                <created>Fri, 22 Jun 2012 22:42:02 +0000</created>
                <updated>Wed, 28 Jan 2015 21:26:36 +0000</updated>
                            <resolved>Wed, 28 Jan 2015 21:26:36 +0000</resolved>
                                                                    <component>Concurrency</component>
                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="815883" author="david.storch" created="Wed, 28 Jan 2015 21:26:20 +0000"  >&lt;p&gt;This ticket refers to the old query framework and does not affect the new query framework&apos;s yielding implementation. Closing as a duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-10026&quot; title=&quot;New query system&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-10026&quot;&gt;&lt;del&gt;SERVER-10026&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
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            <issuekey id="65340">SERVER-8579</issuekey>
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