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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-57578] Use isEmpty instead of numRecords to check if there are any documents left in a collection</title>
                <link>https://jira.mongodb.org/browse/SERVER-57578</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We use Collection::numRecords &lt;a href=&quot;https://github.com/mongodb/mongo/blob/74492a41157f8035ed658c75c006a784f55592e3/src/mongo/db/s/migration_destination_manager.cpp#L801&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;&#160;to check if there are any more documents. Due to the unreliability of Collection::numRecords (see BF-20792 for more details), we should replace the check with Collection::isEmpty.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1774253">SERVER-57578</key>
            <summary>Use isEmpty instead of numRecords to check if there are any documents left in a collection</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="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="13201">Fixed</resolution>
                                        <assignee username="benety.goh@mongodb.com">Benety Goh</assignee>
                                    <reporter username="jason.zhang@mongodb.com">Jason Zhang</reporter>
                        <labels>
                            <label>neweng</label>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Wed, 9 Jun 2021 14:56:05 +0000</created>
                <updated>Sun, 29 Oct 2023 21:52:24 +0000</updated>
                            <resolved>Tue, 15 Jun 2021 16:30:00 +0000</resolved>
                                                    <fixVersion>5.1.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4107016" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 18:15:08 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="3880387" author="xgen-internal-githook" created="Wed, 16 Jun 2021 08:28:55 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Benety Goh&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;username&apos;: &apos;benety&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57578&quot; title=&quot;Use isEmpty instead of numRecords to check if there are any documents left in a collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57578&quot;&gt;&lt;del&gt;SERVER-57578&lt;/del&gt;&lt;/a&gt; CreateIndexesCmd::runCreateIndexesOnNewCollection() checks collection state using Collection::isEmpty() instead of numRecords()&lt;br/&gt;
Branch: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34632&quot; title=&quot;config.chunks change to config.cache.chunks creates a collection long name after upgrade&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34632&quot;&gt;SERVER-34632&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/77156e1bcb57788cfc1d80a51233301eba0beed9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/77156e1bcb57788cfc1d80a51233301eba0beed9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3880385" author="xgen-internal-githook" created="Wed, 16 Jun 2021 08:28:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Benety Goh&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;username&apos;: &apos;benety&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57578&quot; title=&quot;Use isEmpty instead of numRecords to check if there are any documents left in a collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57578&quot;&gt;&lt;del&gt;SERVER-57578&lt;/del&gt;&lt;/a&gt; NonShardServerProcessInterface::createIndexesOnEmptyCollection() uses Collection::isEmpty() instead of numRecords()&lt;br/&gt;
Branch: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34632&quot; title=&quot;config.chunks change to config.cache.chunks creates a collection long name after upgrade&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34632&quot;&gt;SERVER-34632&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5dc06b3ff47fe60838537f9e82818d41693ffa75&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5dc06b3ff47fe60838537f9e82818d41693ffa75&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3880377" author="xgen-internal-githook" created="Wed, 16 Jun 2021 08:28:30 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Benety Goh&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;username&apos;: &apos;benety&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57578&quot; title=&quot;Use isEmpty instead of numRecords to check if there are any documents left in a collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57578&quot;&gt;&lt;del&gt;SERVER-57578&lt;/del&gt;&lt;/a&gt; MigrationDestinationManager checks collection state using Collection::isEmpty()&lt;/p&gt;

&lt;p&gt;Using Collection::isEmpty() is preferred to numRecords() because the former is more reliable&lt;br/&gt;
in cases where we do not need to know the exact number of documents in a collection.&lt;br/&gt;
Collection::numRecords() depends on the fast count cache which may become inaccurate due to&lt;br/&gt;
stepdowns and unclean shutdowns.&lt;br/&gt;
Branch: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34632&quot; title=&quot;config.chunks change to config.cache.chunks creates a collection long name after upgrade&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34632&quot;&gt;SERVER-34632&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0ff1cb8c8735fb596d1e925471e1c4d71c935911&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0ff1cb8c8735fb596d1e925471e1c4d71c935911&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3877421" author="xgen-internal-githook" created="Mon, 14 Jun 2021 23:52:09 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Benety Goh&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;username&apos;: &apos;benety&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57578&quot; title=&quot;Use isEmpty instead of numRecords to check if there are any documents left in a collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57578&quot;&gt;&lt;del&gt;SERVER-57578&lt;/del&gt;&lt;/a&gt; CreateIndexesCmd::runCreateIndexesOnNewCollection() checks collection state using Collection::isEmpty() instead of numRecords()&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/77156e1bcb57788cfc1d80a51233301eba0beed9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/77156e1bcb57788cfc1d80a51233301eba0beed9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3877394" author="xgen-internal-githook" created="Mon, 14 Jun 2021 23:18:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Benety Goh&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;username&apos;: &apos;benety&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57578&quot; title=&quot;Use isEmpty instead of numRecords to check if there are any documents left in a collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57578&quot;&gt;&lt;del&gt;SERVER-57578&lt;/del&gt;&lt;/a&gt; NonShardServerProcessInterface::createIndexesOnEmptyCollection() uses Collection::isEmpty() instead of numRecords()&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5dc06b3ff47fe60838537f9e82818d41693ffa75&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5dc06b3ff47fe60838537f9e82818d41693ffa75&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3877046" author="xgen-internal-githook" created="Mon, 14 Jun 2021 20:29:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Benety Goh&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;username&apos;: &apos;benety&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57578&quot; title=&quot;Use isEmpty instead of numRecords to check if there are any documents left in a collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57578&quot;&gt;&lt;del&gt;SERVER-57578&lt;/del&gt;&lt;/a&gt; MigrationDestinationManager checks collection state using Collection::isEmpty()&lt;/p&gt;

&lt;p&gt;Using Collection::isEmpty() is preferred to numRecords() because the former is more reliable&lt;br/&gt;
in cases where we do not need to know the exact number of documents in a collection.&lt;br/&gt;
Collection::numRecords() depends on the fast count cache which may become inaccurate due to&lt;br/&gt;
stepdowns and unclean shutdowns.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0ff1cb8c8735fb596d1e925471e1c4d71c935911&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0ff1cb8c8735fb596d1e925471e1c4d71c935911&lt;/a&gt;&lt;/p&gt;</comment>
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