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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-31518] There is no way to safely register a shutdown task without potentially crashing if we happen to be in shutdown mode</title>
                <link>https://jira.mongodb.org/browse/SERVER-31518</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;See BF-6795 linked below. In summary, we create a service and register a shutdown task during sharding state initialization, at which time we can be in shutdown mode and invariant the shutdown task registration. This can happen generically for any task we register for shutdown.&lt;/p&gt;

&lt;p&gt;Perhaps a mutex could protect the shutdownFlag, such that a service can be both created and its shutdown task registered, before allowing modification to the shutdownFlag, thus adding safety.&lt;/p&gt;</description>
                <environment></environment>
        <key id="443979">SERVER-31518</key>
            <summary>There is no way to safely register a shutdown task without potentially crashing if we happen to be in shutdown mode</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="dianna.hohensee@mongodb.com">Dianna Hohensee</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
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                <created>Wed, 11 Oct 2017 18:10:47 +0000</created>
                <updated>Fri, 27 Oct 2023 13:54:11 +0000</updated>
                            <resolved>Mon, 16 Oct 2017 18:04:22 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1700015" author="dianna.hohensee" created="Mon, 16 Oct 2017 18:04:23 +0000"  >&lt;p&gt;Closing this ticket because registering a shutdown task works correctly, rather PeriodicBalancerSettingsRefresher is misusing it. PeriodicBalancerSettingsRefresher should be instantiated during start up, it&apos;s shutdown task safely registered at that time when we&apos;re single-threaded, and then sharding initialization should only be starting the service.&lt;/p&gt;

&lt;p&gt;Created &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31585&quot; title=&quot;Remove PeriodicBalancerSettingsRefresher that is both unused and incorrectly set up&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31585&quot;&gt;&lt;del&gt;SERVER-31585&lt;/del&gt;&lt;/a&gt; to remove PeriodicBalancerSettingsRefresher because it is unused and incorrect.&lt;/p&gt;</comment>
                            <comment id="1696507" author="dianna.hohensee" created="Wed, 11 Oct 2017 19:48:13 +0000"  >&lt;p&gt;Yeah, it is an interesting question what our task registration expectations should be, and what they currently are.&lt;/p&gt;

&lt;p&gt;We have services that only run when primary (auto-balancer), and services that only run once sharding initializes (the failure prompting creating this ticket). Those are the ones that I&apos;m aware of, anyway.&lt;/p&gt;</comment>
                            <comment id="1696350" author="schwerin" created="Wed, 11 Oct 2017 18:26:41 +0000"  >&lt;p&gt;Sharding state initialization happens after the process is multithreaded, right? I think that might just be too late to register a shutdown handler. They are intended to be registered during process initialization. Please talk to &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=acm&quot; class=&quot;user-hover&quot; rel=&quot;acm&quot;&gt;acm&lt;/a&gt; about this.&lt;/p&gt;</comment>
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