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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-66456] remove ThreadContext</title>
                <link>https://jira.mongodb.org/browse/SERVER-66456</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Work on &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66385&quot; title=&quot;Remove ThreadName&amp;#39;s dependence on ThreadContext (&amp;amp; vice versa apparently)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66385&quot;&gt;&lt;del&gt;SERVER-66385&lt;/del&gt;&lt;/a&gt; revealed that ThreadContext doesn&apos;t and likely cannot live up to the promise in its documentation of being in a 1-to-1 (bijective) relationship with threads. It can only come into existence when a thread calls ThreadContext::get after MONGO_INITIALIZERs and before static duration object destruction. These contraints are a source of several recent bugs.&lt;/p&gt;

&lt;p&gt;As a Decorable, it can only be created after MONGO_INITIALIZERs, which makes it harder to reason about, and it cannot be used during program shutdown (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58194&quot; title=&quot;Fix undefined behavior in the destructor for OpMsgFuzzerFixture&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58194&quot;&gt;&lt;del&gt;SERVER-58194&lt;/del&gt;&lt;/a&gt; is a bug caused by this). As a thread_local, it must be destroyed before static objects so it is unavailable at shutdown time, even for the main thread. After &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66385&quot; title=&quot;Remove ThreadName&amp;#39;s dependence on ThreadContext (&amp;amp; vice versa apparently)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66385&quot;&gt;&lt;del&gt;SERVER-66385&lt;/del&gt;&lt;/a&gt;, we don&apos;t actually need a ThreadContext at all.&lt;/p&gt;

&lt;p&gt;The only remaining use of ThreadContext is a recent test (according to comments in the test it is nondeterministic anyway (&lt;a href=&quot;https://github.com/mongodb/mongo/commit/263c0631c8001a8cdb42aff720b8a49a621754dd#diff-db39491b47a2be852cb29c36e80fd1932a990c129bd17586578bfed398626b38&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/263c0631c8001a8cdb42aff720b8a49a621754dd#diff-db39491b47a2be852cb29c36e80fd1932a990c129bd17586578bfed398626b38&lt;/a&gt;) , and what it&apos;s doing can be better done with `FailPoint` or other test injection techniques, as there&apos;s a specific thread spawn call that it&apos;s looking for.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2046389">SERVER-66456</key>
            <summary>remove ThreadContext</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="billy.donahue@mongodb.com">Billy Donahue</assignee>
                                    <reporter username="billy.donahue@mongodb.com">Billy Donahue</reporter>
                        <labels>
                    </labels>
                <created>Fri, 13 May 2022 06:11:54 +0000</created>
                <updated>Sun, 29 Oct 2023 21:38:16 +0000</updated>
                            <resolved>Mon, 16 May 2022 19:17:24 +0000</resolved>
                                                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4551037" author="xgen-internal-githook" created="Mon, 16 May 2022 19:07:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Billy Donahue&apos;, &apos;email&apos;: &apos;billy.donahue@mongodb.com&apos;, &apos;username&apos;: &apos;BillyDonahue&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66456&quot; title=&quot;remove ThreadContext&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66456&quot;&gt;&lt;del&gt;SERVER-66456&lt;/del&gt;&lt;/a&gt; remove ThreadContext&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b01267d79d7540cd7ad2198776b2eca17eeb396c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b01267d79d7540cd7ad2198776b2eca17eeb396c&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2044539">SERVER-66385</issuekey>
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                                        <issuelink>
            <issuekey id="2046647">SERVER-66466</issuekey>
        </issuelink>
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                    <name>Related</name>
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                                        <issuelink>
            <issuekey id="1637466">SERVER-54900</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1805940">SERVER-58194</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1986692">SERVER-63852</issuekey>
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