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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-38874] Add ability to observe entering critical section in ShardingMigrationCriticalSection</title>
                <link>https://jira.mongodb.org/browse/SERVER-38874</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Summary&quot;&gt;&lt;/a&gt;Summary&lt;/h2&gt;
&lt;p&gt;ShardingMigrationCriticalSection used to control access logic during migration.&lt;br/&gt;
It currently allows observing when a collection or database leaves critical section. &lt;br/&gt;
This change will allow observing entering a critical section and checking if a collection or database is in a critical section to enable follow up improvements in the migration protocol i.e. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35219&quot; title=&quot;Regain MongoDB balancer performance with sessions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35219&quot;&gt;&lt;del&gt;SERVER-35219&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;

&lt;h2&gt;&lt;a name=&quot;Implementation%3A&quot;&gt;&lt;/a&gt;Implementation:&lt;/h2&gt;
&lt;p&gt;1. add a signal to observe entering the critical section and modify an API to get the signal/&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;enum Transition { kEnterCriticalSection, kExitCriticalSection};&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;std::shared_ptr&amp;lt;Notification&amp;lt;void&amp;gt;&amp;gt; getSignal(Transition, Operation) const; &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
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&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;2. add a method to check if the collection / database is in the critical section.&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;bool inCriticalSection() const;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;3. set the notification to enter a critical section&lt;br/&gt;
set the signal &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.1.6/src/mongo/db/s/sharding_migration_critical_section.cpp#L43&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="667052">SERVER-38874</key>
            <summary>Add ability to observe entering critical section in ShardingMigrationCriticalSection</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="13202">Works as Designed</resolution>
                                        <assignee username="misha.tyulenev@mongodb.com">Misha Tyulenev</assignee>
                                    <reporter username="misha.tyulenev@mongodb.com">Misha Tyulenev</reporter>
                        <labels>
                    </labels>
                <created>Mon, 7 Jan 2019 19:17:02 +0000</created>
                <updated>Fri, 27 Oct 2023 13:53:21 +0000</updated>
                            <resolved>Fri, 25 Jan 2019 13:41:24 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2127116" author="kaloian.manassiev" created="Fri, 25 Jan 2019 13:41:24 +0000"  >&lt;p&gt;Closing this ticket pending the discovery that it is not needed.&lt;/p&gt;</comment>
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            <issuekey id="549616">SERVER-35219</issuekey>
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