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    <title>MongoDB Jira</title>
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    <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-53057] Make ViewCatalog copy-on-write</title>
                <link>https://jira.mongodb.org/browse/SERVER-53057</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-52559&quot; title=&quot;Resolving namespace in aggregation should not require collection lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-52559&quot;&gt;&lt;del&gt;SERVER-52559&lt;/del&gt;&lt;/a&gt; needs to make &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a9a1aec2819dfca8795e022817189a651a09d2e4/src/mongo/db/commands/run_aggregate.cpp#L265-L273&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this lock&lt;/a&gt; lock-free, but the db.system.views collection lock is currently taken to avoid cycles in view definition resolution: i.e. allowing views to continue to be created or modified during aggregation pipeline view definition resolution can lead to an endless cycle.&lt;/p&gt;

&lt;p&gt;A way to resolve &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-52559&quot; title=&quot;Resolving namespace in aggregation should not require collection lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-52559&quot;&gt;&lt;del&gt;SERVER-52559&lt;/del&gt;&lt;/a&gt;&apos;s issue is to make the ViewCatalog copy-on-write. Lock-free reads already fetch shared_ptr&amp;lt;ViewCatalog&amp;gt; in order to avoid the ViewCatalog destructing during lock-free operation. This change would make the ViewCatalog immutable for lock-free reads.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1550908">SERVER-53057</key>
            <summary>Make ViewCatalog copy-on-write</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="henrik.edin@mongodb.com">Henrik Edin</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                    </labels>
                <created>Tue, 24 Nov 2020 15:09:44 +0000</created>
                <updated>Sun, 29 Oct 2023 22:00:04 +0000</updated>
                            <resolved>Thu, 10 Dec 2020 16:04:56 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3523932" author="xgen-internal-githook" created="Wed, 9 Dec 2020 21:29:10 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Henrik Edin&apos;, &apos;email&apos;: &apos;henrik.edin@mongodb.com&apos;, &apos;username&apos;: &apos;henrikedin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53057&quot; title=&quot;Make ViewCatalog copy-on-write&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53057&quot;&gt;&lt;del&gt;SERVER-53057&lt;/del&gt;&lt;/a&gt; Read-copy-update for the ViewCatalog.&lt;/p&gt;

&lt;p&gt;get() now returns an immutable instance.&lt;br/&gt;
Modifications are done with static functions in the ViewCatalog that perform the update serialized by a write mutex.&lt;/p&gt;

&lt;p&gt;Const-correct usage of the ViewCatalog.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c7692fcb55476c5b7d1f17f10662935255637012&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c7692fcb55476c5b7d1f17f10662935255637012&lt;/a&gt;&lt;/p&gt;</comment>
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