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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-69435] Make the CSS acquisition a RAII</title>
                <link>https://jira.mongodb.org/browse/SERVER-69435</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently the CSS (collection sharding state) service is protected by a ResourceMutex, which is owned by the CSS itself. This means it is not possible to lock it before a reference to that service is obtained or from outside. This prevents implementing dropping and the lock-free concurrency control scenarios where we require several services to be kept in sync.&lt;/p&gt;

&lt;p&gt;This ticket is to pull the locking of the CSS outside of the CSS object itself, so that it can be held locked for longer than the lifetime of the CSS. Furthermore, it will serve as an input to the &quot;optimistic services snapshots&quot; work later on, which needs to obtain a snapshot of everything about a collection in an atomic manner without holding locks.&lt;/p&gt;

&lt;p&gt;This lock must be acquired always at a level-0, meaning it must be the last lock acquired.&lt;/p&gt;

&lt;p&gt;It is either:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Only the CSS lock by itself&lt;/li&gt;
	&lt;li&gt;The db/collection locking hierarchy + DSS lock + CSS lock&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="2129139">SERVER-69435</key>
            <summary>Make the CSS acquisition a RAII</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="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                            <label>PM-2144-Milestone-0</label>
                    </labels>
                <created>Mon, 5 Sep 2022 06:39:44 +0000</created>
                <updated>Sun, 29 Oct 2023 21:33:36 +0000</updated>
                            <resolved>Wed, 26 Oct 2022 08:55:12 +0000</resolved>
                                                    <fixVersion>6.2.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4927888" author="xgen-internal-githook" created="Wed, 26 Oct 2022 08:42:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Serra Torrens&apos;, &apos;email&apos;: &apos;jordi.serra-torrens@mongodb.com&apos;, &apos;username&apos;: &apos;jordist&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-69435&quot; title=&quot;Make the CSS acquisition a RAII&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-69435&quot;&gt;&lt;del&gt;SERVER-69435&lt;/del&gt;&lt;/a&gt; Make the CSS acquisition a RAII&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1ddc20571ad31d622045d80049c4e7879a780a14&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1ddc20571ad31d622045d80049c4e7879a780a14&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4845321" author="xgen-internal-githook" created="Wed, 21 Sep 2022 15:00:39 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kaloian Manassiev&apos;, &apos;email&apos;: &apos;kaloian.manassiev@mongodb.com&apos;, &apos;username&apos;: &apos;kaloianm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-69435&quot; title=&quot;Make the CSS acquisition a RAII&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-69435&quot;&gt;&lt;del&gt;SERVER-69435&lt;/del&gt;&lt;/a&gt; Cleanup includes and libraries&lt;/p&gt;

&lt;p&gt;General cleanup in preparation for the larger incoming change&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5274f1afdb125e6415d13892d6f8a58a8dba66a3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5274f1afdb125e6415d13892d6f8a58a8dba66a3&lt;/a&gt;&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="2129138">SERVER-69434</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2143073">SERVER-69893</issuekey>
        </issuelink>
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            <issuekey id="2327068">SERVER-76652</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2172748">SERVER-71010</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2175016">SERVER-71081</issuekey>
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