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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-66176] [v4.4/v4.2] Minimize work under CollectionCatalog mutex</title>
                <link>https://jira.mongodb.org/browse/SERVER-66176</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The CollectionCatalog mutex can be a source of contention. There are some minor improvements that can be done without changing how the system works at a high level.&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Hash namespace/uuid without holding the lock&lt;/li&gt;
	&lt;li&gt;Add interface to match call patterns. &lt;tt&gt;RequiresCollectionStage::doRestoreState&lt;/tt&gt; makes two calls (requiring taking and releasing the mutex twice) for something that can be implemented as a single call.&lt;/li&gt;
&lt;/ol&gt;
</description>
                <environment></environment>
        <key id="2038792">SERVER-66176</key>
            <summary>[v4.4/v4.2] Minimize work under CollectionCatalog mutex</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="13201">Fixed</resolution>
                                        <assignee username="henrik.edin@mongodb.com">Henrik Edin</assignee>
                                    <reporter username="henrik.edin@mongodb.com">Henrik Edin</reporter>
                        <labels>
                    </labels>
                <created>Tue, 3 May 2022 19:05:58 +0000</created>
                <updated>Sun, 29 Oct 2023 21:38:39 +0000</updated>
                            <resolved>Tue, 17 May 2022 14:57:20 +0000</resolved>
                                                    <fixVersion>4.4.15</fixVersion>
                    <fixVersion>4.2.21</fixVersion>
                                                        <votes>0</votes>
                                    <watches>14</watches>
                                                                                                                <comments>
                            <comment id="4559532" author="xgen-internal-githook" created="Thu, 19 May 2022 15:09:12 +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-66176&quot; title=&quot;[v4.4/v4.2] Minimize work under CollectionCatalog mutex&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66176&quot;&gt;&lt;del&gt;SERVER-66176&lt;/del&gt;&lt;/a&gt; Reduce work under CollectionCatalog lock&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;Perform hashing before taking lock.&lt;/li&gt;
	&lt;li&gt;Add new API for restoring after yield where we can lookup by UUID and verify namespace in the same critical section. Avoid two calls and copying the namespace under the lock.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;(cherry picked from commit 7e0f7d50da0915428a3bfa10a656cd999d5fa10e)&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/686303404d6faa0dde943deea549005baf46efb4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/686303404d6faa0dde943deea549005baf46efb4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4541564" author="xgen-internal-githook" created="Wed, 11 May 2022 13:51:06 +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-66176&quot; title=&quot;[v4.4/v4.2] Minimize work under CollectionCatalog mutex&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66176&quot;&gt;&lt;del&gt;SERVER-66176&lt;/del&gt;&lt;/a&gt; Reduce work under CollectionCatalog lock&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;Perform hashing before taking lock.&lt;/li&gt;
	&lt;li&gt;Add new API for restoring after yield where we can lookup by UUID and verify namespace in the same critical section. Avoid two calls and copying the namespace under the lock.&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7e0f7d50da0915428a3bfa10a656cd999d5fa10e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7e0f7d50da0915428a3bfa10a656cd999d5fa10e&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
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