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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-58418] Fine-grained implementation of the ShardingMigrationCriticalSection</title>
                <link>https://jira.mongodb.org/browse/SERVER-58418</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The goal of this task is to provide a fine-grained implementation of the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/s/sharding_migration_critical_section.h&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ShardingMigrationCriticalSection&lt;/a&gt; that allow us to acquire/promote the CS for a chunk range.&lt;/p&gt;

&lt;p&gt;More specifically:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Offer a way to acquire/promote the CS specifying the chunk range and expose methods to query those values.&lt;/li&gt;
	&lt;li&gt;Note that there are operations such as rename or reshard that require to block the whole collection.&lt;/li&gt;
	&lt;li&gt;We should consider the range as part of the &lt;em&gt;identifier&lt;/em&gt; of a CS, in the sense that if the CS was acquired for the range &lt;tt&gt;[MIN, 0)&lt;/tt&gt; but then it is promoted without a range (i.e. as if we want to block the whole collection) it should emit an error.&lt;/li&gt;
	&lt;li&gt;Q: Right now the implementation of &lt;span class=&quot;error&quot;&gt;&amp;#91;recoverable critical sections|thttps://github.com/mongodb/mongo/blob/master/src/mongo/db/s/sharding_migration_critical_section.h&amp;#93;&lt;/span&gt; has exactly the same interface as the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/s/sharding_migration_critical_section.h&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ShardingMigrationCriticalSection&lt;/a&gt;. This is going to change with this work. As part of this ticket, it would be interesting to check if there is any potential problem.&lt;/li&gt;
&lt;/ul&gt;
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                <environment></environment>
        <key id="1814820">SERVER-58418</key>
            <summary>Fine-grained implementation of the ShardingMigrationCriticalSection</summary>
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                                            <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="backlog-server-sharding-emea">[DO NOT USE] Backlog - Sharding EMEA</assignee>
                                    <reporter username="sergi.mateo-bellido@mongodb.com">Sergi Mateo Bellido</reporter>
                        <labels>
                    </labels>
                <created>Mon, 12 Jul 2021 07:51:25 +0000</created>
                <updated>Tue, 6 Dec 2022 01:08:00 +0000</updated>
                            <resolved>Wed, 4 Aug 2021 11:23:45 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
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                                                                                                                <comments>
                            <comment id="3980070" author="JIRAUSER1256927" created="Wed, 4 Aug 2021 11:23:45 +0000"  >&lt;p&gt;After discussing it wil Kal we thought that it would be a nicer approach to move the implementation of the CS to a lower level, close to the storage execution. More info on &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58417&quot; title=&quot;POC: fine-grained collection critical sections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58417&quot;&gt;&lt;del&gt;SERVER-58417&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
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