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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-47564] Add concurrency control to setting and unsetting the ShardingMigrationCriticalSection flag that does not rely upon collection locks</title>
                <link>https://jira.mongodb.org/browse/SERVER-47564</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a94df7c8c6f36e67086406b5778368f97dc1bd7f/src/mongo/db/s/sharding_migration_critical_section.cpp&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ShardingMigrationCriticalSection for each collection has no concurrency control itself&lt;/a&gt;. It depends upon the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a94df7c8c6f36e67086406b5778368f97dc1bd7f/src/mongo/db/s/collection_sharding_runtime.cpp#L181-L197&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;CollectionShardingRuntime&lt;/a&gt; to provide concurrency control. The two ShardingMigrationCriticalSection::entering* functions expect a collection X lock, the ShardingMigrationCriticalSection::exit* function expects a IX lock, and ShardingMigrationCriticalSection::get* presumably expects callers to hold a collection IS lock.&lt;/p&gt;

&lt;p&gt;I do not understand how ShardingMigrationCriticalSection::get* and ShardingMigrationCriticalSection::exit* are concurrency safe, setting and accessing the same private class variable without a mutex to serialize such operations?&lt;/p&gt;

&lt;p&gt;(note: this is going to remain on the execution backlog until the project design is finalized, then it will be passed to sharding to complete. this is to keep track of the work specifics)&lt;/p&gt;</description>
                <environment></environment>
        <key id="1316170">SERVER-47564</key>
            <summary>Add concurrency control to setting and unsetting the ShardingMigrationCriticalSection flag that does not rely upon collection locks</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>
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                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                    </labels>
                <created>Wed, 15 Apr 2020 17:11:34 +0000</created>
                <updated>Tue, 6 Dec 2022 02:29:40 +0000</updated>
                            <resolved>Wed, 15 Apr 2020 18:00:26 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
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