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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-50678] Implement lock-free version of AutoGetCollectionForRead</title>
                <link>https://jira.mongodb.org/browse/SERVER-50678</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Change the &lt;tt&gt;AutoGetCollectionForRead&lt;/tt&gt; class to no longer take collection &lt;tt&gt;MODE_IS&lt;/tt&gt; locks, when flagged to do so, while still performing the same checks and providing the same read semantics.&lt;/p&gt;

&lt;p&gt;The flagging may be done through a special enum constant to be passed to the constructor, or similar approach. The idea is that we can change individual call sites to use lock-free reads or not.&lt;/p&gt;

&lt;p&gt;This ticket probably can only be tested through a unit test or dbtest until at least &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-50145&quot; title=&quot;Have DDL operations and MODE_X writers install a new Collection object&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-50145&quot;&gt;&lt;del&gt;SERVER-50145&lt;/del&gt;&lt;/a&gt; is done.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1459215">SERVER-50678</key>
            <summary>Implement lock-free version of AutoGetCollectionForRead</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="dianna.hohensee@mongodb.com">Dianna Hohensee</assignee>
                                    <reporter username="geert.bosch@mongodb.com">Geert Bosch</reporter>
                        <labels>
                    </labels>
                <created>Tue, 1 Sep 2020 18:21:21 +0000</created>
                <updated>Sun, 29 Oct 2023 22:03:43 +0000</updated>
                            <resolved>Thu, 8 Oct 2020 12:43:29 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Catalog</component>
                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4912633" author="JIRAUSER1264163" created="Wed, 19 Oct 2022 14:22:27 +0000"  >&lt;p&gt;Yes, I only need to backport the &lt;tt&gt;skipRSTLLock&lt;/tt&gt; parameter in GlobalLock for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-60016&quot; title=&quot;serverStatus and collection stats should not block on the RSTL lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60016&quot;&gt;&lt;del&gt;SERVER-60016&lt;/del&gt;&lt;/a&gt; to work&lt;/p&gt;</comment>
                            <comment id="4912619" author="dianna.hohensee" created="Wed, 19 Oct 2022 14:19:49 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jordi.olivares-provencio%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;jordi.olivares-provencio@mongodb.com&quot;&gt;jordi.olivares-provencio@mongodb.com&lt;/a&gt;&#160;just to be clear, I do not recommend backporting all of this: it&apos;s part of a project. But it looks like you just need the GlobalLock changes for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-60016&quot; title=&quot;serverStatus and collection stats should not block on the RSTL lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60016&quot;&gt;&lt;del&gt;SERVER-60016&lt;/del&gt;&lt;/a&gt;, which should be fine.&#160;&lt;/p&gt;</comment>
                            <comment id="4911895" author="JIRAUSER1264163" created="Wed, 19 Oct 2022 08:58:40 +0000"  >&lt;p&gt;Requesting backport due to backports of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-60016&quot; title=&quot;serverStatus and collection stats should not block on the RSTL lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60016&quot;&gt;&lt;del&gt;SERVER-60016&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3433835" author="xgen-internal-githook" created="Thu, 8 Oct 2020 08:45:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Dianna Hohensee&apos;, &apos;email&apos;: &apos;dianna.hohensee@mongodb.com&apos;, &apos;username&apos;: &apos;DiannaHohensee&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-50678&quot; title=&quot;Implement lock-free version of AutoGetCollectionForRead&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-50678&quot;&gt;&lt;del&gt;SERVER-50678&lt;/del&gt;&lt;/a&gt; Implement lock-free version of AutoGetCollection&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ca0150eaf6cad95debae550c28fd50bb016db396&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ca0150eaf6cad95debae550c28fd50bb016db396&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1499218">SERVER-51319</issuekey>
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            <issuekey id="1499240">SERVER-51320</issuekey>
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