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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>[DRIVERS-2184] estimatedDocumentCount should use count command for 5.0.x + not-stable API</title>
                <link>https://jira.mongodb.org/browse/DRIVERS-2184</link>
                <project id="10980" key="DRIVERS">Drivers</project>
                    <description>&lt;div class=&quot;panel&quot; style=&quot;background-color: #fafbfc;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #fafbfc;&quot;&gt;
&lt;h3&gt;&lt;a name=&quot;Summary&quot;&gt;&lt;/a&gt;&lt;b&gt;Summary&lt;/b&gt;&lt;/h3&gt;

&lt;p&gt;The MongoDB drivers implementation for the estimatedDocumentCount helper changed for 5.0.x+ from using the count command to aggregate with a $collStats stage. This resulted in a change in behavior, where this helper will no longer provide a fallback from the estimate to an accurate/slow collection count. The means that users can no longer use this helper to determine the document count for a view. We would like to restore the previous behavior for users of 5.0.x+ when they are not using the stable API.&lt;/p&gt;

&lt;p&gt;Note that we expect to make a follow up change for 6.0+ to use a new $approxCount stage under&#160;DRIVERS-1982.&lt;/p&gt;
&lt;h3&gt;&lt;a name=&quot;Motivation&quot;&gt;&lt;/a&gt;&lt;b&gt;Motivation&lt;/b&gt;&lt;/h3&gt;
&lt;h4&gt;&lt;a name=&quot;Whoistheaffectedenduser%3F&quot;&gt;&lt;/a&gt;Who is the affected end user?&lt;/h4&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-59674&quot; title=&quot;estimatedDocumentCount does not work on views on 5.0+&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-59674&quot;&gt;&lt;del&gt;SERVER-59674&lt;/del&gt;&lt;/a&gt; tracks affected end users. Currently this includes a small number of internal and external users.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Howdoesthisaffecttheenduser%3F&quot;&gt;&lt;/a&gt;How does this affect the end user?&lt;/h4&gt;

&lt;p&gt;Users who use the estimatedDocumentCount helper to determine the count for a view will encounter an error rather than receive an accurate/slow count.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Howlikelyisitthatthisproblemorusecasewilloccur%3F&quot;&gt;&lt;/a&gt;How likely is it that this problem or use case will occur?&lt;/h4&gt;

&lt;p&gt;Users of estimatedDocumentCount and non-materialized views will encounter this issue.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Iftheproblemdoesoccur%2Cwhataretheconsequencesandhowseverearethey%3F&quot;&gt;&lt;/a&gt;If the problem does occur, what are the consequences and how severe are they?&lt;/h4&gt;

&lt;p&gt;This has the potential to break a user application on server+driver upgrade to 5.0. To work around without this change, they would need swap usage of this helper with a count command invocation.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Isthisissueurgent%3F&quot;&gt;&lt;/a&gt;Is this issue urgent?&lt;/h4&gt;

&lt;p&gt;No required timeline but as this impacts any users who upgrade to 5.0 we should look to expedite if possible.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Isthisticketrequiredbyadownstreamteam%3F&quot;&gt;&lt;/a&gt;Is this ticket required by a downstream team?&lt;/h4&gt;

&lt;p&gt;Both Atlas and Data Explorer teams were impacted by this.&#160;I believe both have worked around, but may be interested in knowing that this is available.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Isthisticketonlyfortests%3F&quot;&gt;&lt;/a&gt;Is this ticket only for tests?&lt;/h4&gt;

&lt;p&gt;No&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;</description>
                <environment></environment>
        <key id="1975943">DRIVERS-2184</key>
            <summary>estimatedDocumentCount should use count command for 5.0.x + not-stable API</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="bernie@mongodb.com">Bernie Hackett</assignee>
                                    <reporter username="james.wahlin@mongodb.com">James Wahlin</reporter>
                        <labels>
                    </labels>
                <created>Wed, 2 Feb 2022 17:06:05 +0000</created>
                <updated>Mon, 7 Feb 2022 16:30:37 +0000</updated>
                            <resolved>Mon, 7 Feb 2022 16:30:37 +0000</resolved>
                                                                            <votes>0</votes>
                                    <watches>4</watches>
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                                                                <inwardlinks description="is related to">
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            <issuekey id="1863328">SERVER-59674</issuekey>
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