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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-54403] The paradigm of acquiring DSSLocks and CSSLocks AFTER fetching the DSS or CSS under a database/collection level lock doesn&apos;t work in a lock-free read world</title>
                <link>https://jira.mongodb.org/browse/SERVER-54403</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;tt&gt;DatabaseShardingState&lt;/tt&gt; and &lt;tt&gt;CollectionShardingState&lt;/tt&gt;&#160;use &lt;tt&gt;DSSLock&lt;/tt&gt;&#160;and &lt;tt&gt;CSSLock&lt;/tt&gt;&#160;mutex RAII types that can only be accessed AFTER the &lt;tt&gt;DSS&lt;/tt&gt;&#160;or &lt;tt&gt;CSS&lt;/tt&gt;&#160;is fetched. A collection or database level-lock currently protects the &lt;tt&gt;DSS::get()&lt;/tt&gt;&#160;and &lt;tt&gt;CSS::get()&lt;/tt&gt;&#160;methods. We will not have coll and db locks in the not too distant future, so these expectations should change. Either &lt;tt&gt;DSS&lt;/tt&gt;&#160;and &lt;tt&gt;CSS&lt;/tt&gt;&#160;should always be safe to access without lock or mutex &#8211; the current implementation is, but not officially &#8211;, or the &lt;tt&gt;DSSLock&lt;/tt&gt;&#160;and &lt;tt&gt;CSSLock&lt;/tt&gt;&#160;concepts need to work somehow before fetching the &lt;tt&gt;DSS&lt;/tt&gt;&#160;or &lt;tt&gt;CSS&lt;/tt&gt;. (currently the &lt;tt&gt;DSS/CSSLock&lt;/tt&gt;&#160;types lock the mutex IN the &lt;tt&gt;DSS/CSS&lt;/tt&gt;).&lt;/p&gt;

&lt;p&gt;We already bypass locking requirements via special DSS/CSS::getSharedForLockFreeReads() getter functions, currently only used by lock-free read supporting operations (find,getMore,count,distinct,mapReduce).&lt;/p&gt;</description>
                <environment></environment>
        <key id="1616501">SERVER-54403</key>
            <summary>The paradigm of acquiring DSSLocks and CSSLocks AFTER fetching the DSS or CSS under a database/collection level lock doesn&apos;t work in a lock-free read world</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>
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                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="backlog-server-sharding-emea">[DO NOT USE] Backlog - Sharding EMEA</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                            <label>PM-2144-Milestone-0</label>
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                <created>Mon, 8 Feb 2021 19:32:27 +0000</created>
                <updated>Tue, 4 Jul 2023 14:00:53 +0000</updated>
                            <resolved>Tue, 4 Jul 2023 14:00:53 +0000</resolved>
                                                                                        <votes>0</votes>
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                                                                                                                <comments>
                            <comment id="5542625" author="JIRAUSER1257318" created="Tue, 4 Jul 2023 14:00:53 +0000"  >&lt;p&gt;This is exactly what PM-2144 addresses.&lt;/p&gt;</comment>
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