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    <title>MongoDB Jira</title>
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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-70198] Use one single RESOURCE_MUTEX to protect concurrent operations on DatabaseShardingState for all databases</title>
                <link>https://jira.mongodb.org/browse/SERVER-70198</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-69434&quot; title=&quot;Make the DSS acquisition a RAII&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-69434&quot;&gt;&lt;del&gt;SERVER-69434&lt;/del&gt;&lt;/a&gt; changed DatabaseShardingState to protect concurrent access to it by using a LockManager RESOURCE_MUTEX with ResourceId(RESOURCE_MUTEX, dbName). However, constructing ResourceIds outside ResourceIdFactory is not correct and causes bugs like &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-70154&quot; title=&quot;DatabaseShardingState inappropriately constructs a RESOURCE_MUTEX ResourceId, leading to uncaught exception&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-70154&quot;&gt;&lt;del&gt;SERVER-70154&lt;/del&gt;&lt;/a&gt;. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-69893&quot; title=&quot;Add the ability to acquire lock manager mutex resources by name&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-69893&quot;&gt;&lt;del&gt;SERVER-69893&lt;/del&gt;&lt;/a&gt; proposed a new LockManager lock type to work around this limitation, but agreement has been reached in favor of avoiding the introduction new lock types to the LockManager. &lt;/p&gt;

&lt;p&gt;The proposed alternative is to use one single RESOURCE_MUTEX to protect access to all DatabaseShardingStates &amp;#8211; for all databases in the system. The rationale is that:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;No blocking work is ever done under the this lock (only read in memory structures under IS, and update memory structures under X),&lt;/li&gt;
	&lt;li&gt;X mode acquisitions are very rare.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="2151121">SERVER-70198</key>
            <summary>Use one single RESOURCE_MUTEX to protect concurrent operations on DatabaseShardingState for all databases</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</assignee>
                                    <reporter username="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</reporter>
                        <labels>
                    </labels>
                <created>Tue, 4 Oct 2022 10:28:37 +0000</created>
                <updated>Mon, 17 Oct 2022 15:14:31 +0000</updated>
                            <resolved>Mon, 17 Oct 2022 15:14:31 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4907198" author="JIRAUSER1257318" created="Mon, 17 Oct 2022 15:14:21 +0000"  >&lt;p&gt;Won&apos;t do. Instead we&apos;ll do &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-70610&quot; title=&quot;Move the DatabaseShardingState RESOURCE_MUTEXes to the DatabaseShardingStateMap&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-70610&quot;&gt;&lt;del&gt;SERVER-70610&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
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