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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-53092] Ensure FCV stability while executing critical paths</title>
                <link>https://jira.mongodb.org/browse/SERVER-53092</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In order to ensure FCV stability without holding the FCV lock during expensive operations, it will need to be implemented a component enclosing the following logic:&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;Take FCV lock in Shared mode&lt;/li&gt;
	&lt;li&gt;Quickly check what is the current FCV and make up some decision about what to do (return or go to step 3)&lt;/li&gt;
	&lt;li&gt;Write some Placeholder somewhere (most likely this will be the Primary Only Service) to indicate that there is an operation running under a specific FCV version&lt;/li&gt;
	&lt;li&gt;Release the FCV lock&lt;/li&gt;
	&lt;li&gt;Do the expensive/network communicating work outside of any locks and possibly on a different thread, etc...&lt;/li&gt;
	&lt;li&gt;Remove the Placeholder from (3)&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;The Placeholder from (3), which will be used to decide whether it&apos;s allowed to &lt;span class=&quot;error&quot;&gt;&amp;#91;down|up&amp;#93;&lt;/span&gt;grade the FCV: it will be needed to wait for all of the Placeholder(s) to drain before setting the FCV to a different version.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1553621">SERVER-53092</key>
            <summary>Ensure FCV stability while executing critical paths</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="13201">Fixed</resolution>
                                        <assignee username="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                            <label>PM-1965-Milestone-0-Metadata-Format</label>
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                <created>Fri, 27 Nov 2020 11:34:38 +0000</created>
                <updated>Sun, 29 Oct 2023 21:59:59 +0000</updated>
                            <resolved>Thu, 18 Feb 2021 11:40:15 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3622482" author="xgen-internal-githook" created="Thu, 18 Feb 2021 11:37:02 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Serra Torrens&apos;, &apos;email&apos;: &apos;jordi.serra-torrens@mongodb.com&apos;, &apos;username&apos;: &apos;jordist&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53092&quot; title=&quot;Ensure FCV stability while executing critical paths&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53092&quot;&gt;&lt;del&gt;SERVER-53092&lt;/del&gt;&lt;/a&gt;: Ensure FCV stability while executing DDL critical paths&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/aac35501ac8d4cea15e69ad6230d99761682ef65&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/aac35501ac8d4cea15e69ad6230d99761682ef65&lt;/a&gt;&lt;/p&gt;</comment>
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