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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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<item>
            <title>[SERVER-84295] count  time-series collection is very slow,  db.collection.count() run COLLSCAN stage.</title>
                <link>https://jira.mongodb.org/browse/SERVER-84295</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;count &#160;time-series collection is very slow, &#160;db.collection.count() run COLLSCAN stage.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2528324">SERVER-84295</key>
            <summary>count  time-series collection is very slow,  db.collection.count() run COLLSCAN stage.</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="11262" iconUrl="https://jira.mongodb.org/images/icons/statuses/generic.png" description="">Investigating</status>
                    <statusCategory id="4" key="indeterminate" colorName="inprogress"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="edwin.zhou@mongodb.com">Edwin Zhou</assignee>
                                    <reporter username="1147952115@qq.com">y yz</reporter>
                        <labels>
                    </labels>
                <created>Tue, 19 Dec 2023 08:50:23 +0000</created>
                <updated>Mon, 15 Jan 2024 12:44:25 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>3</watches>
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                            <comment id="6006281" author="1147952115@qq.com" created="Fri, 12 Jan 2024 04:28:43 +0000"  >&lt;p&gt;hi, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=edwin.zhou%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;edwin.zhou@mongodb.com&quot;&gt;edwin.zhou@mongodb.com&lt;/a&gt;&#160;&lt;/p&gt;

&lt;p&gt;This is a very serious bug and you should not turn off this PR because count should be retrieved from metadata, not a full table scan.&lt;/p&gt;

&lt;p&gt;please open the PR again, thanks.&lt;/p&gt;</comment>
                            <comment id="5960134" author="JIRAUSER1257066" created="Tue, 19 Dec 2023 14:57:49 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=1147952115%40qq.com&quot; class=&quot;user-hover&quot; rel=&quot;1147952115@qq.com&quot;&gt;1147952115@qq.com&lt;/a&gt;, &lt;/p&gt;

&lt;p&gt;For this issue we&apos;d like to encourage you to start by asking our community for help by posting on the &lt;a href=&quot;https://www.mongodb.com/community/forums&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;MongoDB Developer Community Forums&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;If the discussion there leads you to suspect a bug in the MongoDB server, then we&apos;d want to investigate it as a possible bug here in the SERVER project.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Edwin&lt;/p&gt;</comment>
                            <comment id="5959479" author="1147952115@qq.com" created="Tue, 19 Dec 2023 08:52:10 +0000"  >&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/498329/498329_image-2023-12-19-16-52-07-123.png&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;</comment>
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