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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-34243] listCollections should not require a MODE_S database lock</title>
                <link>https://jira.mongodb.org/browse/SERVER-34243</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently the &lt;tt&gt;listCollections&lt;/tt&gt; command requires a &lt;tt&gt;MODE_S&lt;/tt&gt; lock on the database it&apos;s run on. When any transaction is active on that database, it will generally have a &lt;tt&gt;MODE_IX&lt;/tt&gt; lock on a collection. This will conflict with the &lt;tt&gt;MODE_S&lt;/tt&gt; lock on the database, causing &lt;tt&gt;listCollections&lt;/tt&gt; to block until the transaction is finished or aborted.&lt;/p&gt;

&lt;p&gt;It should be sufficient to have the &lt;tt&gt;MODE_IS&lt;/tt&gt; lock on the database, as long as each collection is locked as its details are gathered.&lt;/p&gt;</description>
                <environment></environment>
        <key id="519611">SERVER-34243</key>
            <summary>listCollections should not require a MODE_S database lock</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="geert.bosch@mongodb.com">Geert Bosch</assignee>
                                    <reporter username="geert.bosch@mongodb.com">Geert Bosch</reporter>
                        <labels>
                    </labels>
                <created>Fri, 30 Mar 2018 22:17:34 +0000</created>
                <updated>Sun, 29 Oct 2023 22:33:07 +0000</updated>
                            <resolved>Sat, 21 Apr 2018 12:58:00 +0000</resolved>
                                    <version>3.7.3</version>
                                    <fixVersion>3.7.6</fixVersion>
                    <fixVersion>3.6.21</fixVersion>
                                    <component>Catalog</component>
                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>15</watches>
                                                                                                                <comments>
                            <comment id="3412343" author="xgen-internal-githook" created="Fri, 25 Sep 2020 18:16:22 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Geert Bosch&apos;, &apos;email&apos;: &apos;geert@mongodb.com&apos;, &apos;username&apos;: &apos;GeertBosch&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34243&quot; title=&quot;listCollections should not require a MODE_S database lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34243&quot;&gt;&lt;del&gt;SERVER-34243&lt;/del&gt;&lt;/a&gt; Use MODE_IS for listCollections&lt;/p&gt;

&lt;p&gt;(cherry picked from commit bb148ced1999ffee8ebc58cb0fbefd784ac51a1f)&lt;/p&gt;

&lt;p&gt;Conflicts:&lt;br/&gt;
	jstests/core/txns/list_collections_not_blocked_by_txn.js&lt;br/&gt;
	src/mongo/db/commands/list_collections.cpp&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/16b23f3ac57b8bb015088fdb6af1fb5667c47624&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/16b23f3ac57b8bb015088fdb6af1fb5667c47624&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1870399" author="xgen-internal-githook" created="Fri, 20 Apr 2018 18:48:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;geert@mongodb.com&apos;, &apos;username&apos;: &apos;GeertBosch&apos;, &apos;name&apos;: &apos;Geert Bosch&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34243&quot; title=&quot;listCollections should not require a MODE_S database lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34243&quot;&gt;&lt;del&gt;SERVER-34243&lt;/del&gt;&lt;/a&gt; Use MODE_IS for listCollections&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bb148ced1999ffee8ebc58cb0fbefd784ac51a1f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bb148ced1999ffee8ebc58cb0fbefd784ac51a1f&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="612237">SERVER-37408</issuekey>
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