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    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
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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-37496] The balancer shouldn&apos;t register a shutdown task after the process is multithreaded</title>
                <link>https://jira.mongodb.org/browse/SERVER-37496</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The balancer &lt;a href=&quot;https://github.com/mongodb/mongo/blob/955fc08dd184991074668155d66c7534b9cb55f3/src/mongo/db/s/balancer/balancer.cpp#L171-L177&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;registers a shutdown task when it is created&lt;/a&gt;, but &lt;a href=&quot;https://github.com/mongodb/mongo/blob/955fc08dd1/src/mongo/db/db.cpp#L560&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this happens after&lt;/a&gt;&#160;the mongod process is multithreaded, so it&apos;s possible for the server to be shutting down when the task is registered, which &lt;a href=&quot;https://github.com/mongodb/mongo/blob/955fc08dd1/src/mongo/util/exit.cpp#L100&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;triggers this invariant&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Instead, we should probably check if the balancer exists in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/955fc08dd1/src/mongo/db/db.cpp#L866&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;shutdownTask() defined in db.cpp&lt;/a&gt;&#160;and shut it down if it does, similar to what&apos;s done for other components.&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="614748">SERVER-37496</key>
            <summary>The balancer shouldn&apos;t register a shutdown task after the process is multithreaded</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="13201">Fixed</resolution>
                                        <assignee username="jack.mulrow@mongodb.com">Jack Mulrow</assignee>
                                    <reporter username="jack.mulrow@mongodb.com">Jack Mulrow</reporter>
                        <labels>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Fri, 5 Oct 2018 18:44:48 +0000</created>
                <updated>Sun, 29 Oct 2023 22:27:36 +0000</updated>
                            <resolved>Tue, 23 Oct 2018 17:43:18 +0000</resolved>
                                    <version>3.4.17</version>
                    <version>3.6.8</version>
                    <version>4.0.3</version>
                    <version>4.1.3</version>
                                    <fixVersion>3.4.19</fixVersion>
                    <fixVersion>3.6.9</fixVersion>
                    <fixVersion>4.0.4</fixVersion>
                    <fixVersion>4.1.5</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2067845" author="xgen-internal-githook" created="Tue, 20 Nov 2018 15:50:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jack Mulrow&apos;, &apos;email&apos;: &apos;jack.mulrow@mongodb.com&apos;, &apos;username&apos;: &apos;jsmulrow&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37496&quot; title=&quot;The balancer shouldn&amp;#39;t register a shutdown task after the process is multithreaded&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37496&quot;&gt;&lt;del&gt;SERVER-37496&lt;/del&gt;&lt;/a&gt; Register balancer shutdown task when MongoD is single-threaded&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 871f1234c72f3f390f81dc31fd8a95d8bc69cf91)&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/68958ba2b0b572f937c24f365bf9d8894735a8c9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/68958ba2b0b572f937c24f365bf9d8894735a8c9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2045660" author="xgen-internal-githook" created="Mon, 29 Oct 2018 22:34:39 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jack Mulrow&apos;, &apos;email&apos;: &apos;jack.mulrow@mongodb.com&apos;, &apos;username&apos;: &apos;jsmulrow&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37496&quot; title=&quot;The balancer shouldn&amp;#39;t register a shutdown task after the process is multithreaded&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37496&quot;&gt;&lt;del&gt;SERVER-37496&lt;/del&gt;&lt;/a&gt; Register balancer shutdown task when MongoD is single-threaded&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 871f1234c72f3f390f81dc31fd8a95d8bc69cf91)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/98c2b9e9c05e18c3417dbfd882d7f32b81ec558e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/98c2b9e9c05e18c3417dbfd882d7f32b81ec558e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2045655" author="xgen-internal-githook" created="Mon, 29 Oct 2018 22:27:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jack Mulrow&apos;, &apos;email&apos;: &apos;jack.mulrow@mongodb.com&apos;, &apos;username&apos;: &apos;jsmulrow&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37496&quot; title=&quot;The balancer shouldn&amp;#39;t register a shutdown task after the process is multithreaded&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37496&quot;&gt;&lt;del&gt;SERVER-37496&lt;/del&gt;&lt;/a&gt; Register balancer shutdown task when MongoD is single-threaded&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 871f1234c72f3f390f81dc31fd8a95d8bc69cf91)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/51ba5067d70313de211d22c1d7378024987c7908&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/51ba5067d70313de211d22c1d7378024987c7908&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2039464" author="xgen-internal-githook" created="Tue, 23 Oct 2018 17:42:37 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jack Mulrow&apos;, &apos;email&apos;: &apos;jack.mulrow@mongodb.com&apos;, &apos;username&apos;: &apos;jsmulrow&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37496&quot; title=&quot;The balancer shouldn&amp;#39;t register a shutdown task after the process is multithreaded&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37496&quot;&gt;&lt;del&gt;SERVER-37496&lt;/del&gt;&lt;/a&gt; Register balancer shutdown task when MongoD is single-threaded&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/871f1234c72f3f390f81dc31fd8a95d8bc69cf91&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/871f1234c72f3f390f81dc31fd8a95d8bc69cf91&lt;/a&gt;&lt;/p&gt;</comment>
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