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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-81821] Document that POS framework doesn&apos;t guarantee Instance::run() is called after construction of instance</title>
                <link>https://jira.mongodb.org/browse/SERVER-81821</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;During the lifetime of an active instance after its construction &lt;a href=&quot;https://github.com/10gen/mongo/blob/b28e5ba7904666a2360efcf418467a111b64d82a/src/mongo/db/repl/primary_only_service.cpp#L627&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;, a step down can cause the scoped executor to shut down &lt;a href=&quot;https://github.com/10gen/mongo/blob/b28e5ba7904666a2360efcf418467a111b64d82a/src/mongo/db/repl/primary_only_service.cpp#L495&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; before it actually calls the &lt;a href=&quot;https://github.com/10gen/mongo/blob/b28e5ba7904666a2360efcf418467a111b64d82a/src/mongo/db/repl/primary_only_service.cpp#L826&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;run method&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;The issue with this arises if the same node steps up and the POS framework tries to &lt;a href=&quot;https://github.com/10gen/mongo/blob/b28e5ba7904666a2360efcf418467a111b64d82a/src/mongo/db/repl/primary_only_service.cpp#L411-L421&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;join and destroy previously active instances&lt;/a&gt;. The POS service subclasses may have an internal state that needs to be updated before destruction and they may rely on the &lt;tt&gt;Instance::run()&lt;/tt&gt; method being guaranteed to be called to ascertain that. While this is not a bug with POS, it will be nice to help users avoid this scenario where &lt;tt&gt;Instance::run()&lt;/tt&gt; may not be called perhaps by using &lt;tt&gt;unsafeToInlineFuture&lt;/tt&gt;() before calling &lt;a href=&quot;https://github.com/10gen/mongo/blob/b28e5ba7904666a2360efcf418467a111b64d82a/src/mongo/db/repl/primary_only_service.cpp#L813&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Instance::run() &lt;/a&gt;or at the very least by noting it down in the existing notes &lt;a href=&quot;https://github.com/10gen/mongo/blob/b28e5ba7904666a2360efcf418467a111b64d82a/src/mongo/db/repl/primary_only_service.h#L133&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here &lt;/a&gt;so that users can handle it cleanly when implementing a new service.&lt;/p&gt;


&lt;p&gt;FWIW this issue surfaced from&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/BF-30149?filter=-1&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;BF-30149&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2457853">SERVER-81821</key>
            <summary>Document that POS framework doesn&apos;t guarantee Instance::run() is called after construction of instance</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="jason.chan@mongodb.com">Jason Chan</assignee>
                                    <reporter username="abdul.qadeer@mongodb.com">Abdul Qadeer</reporter>
                        <labels>
                    </labels>
                <created>Tue, 3 Oct 2023 19:30:24 +0000</created>
                <updated>Wed, 6 Dec 2023 19:46:28 +0000</updated>
                            <resolved>Wed, 6 Dec 2023 19:46:28 +0000</resolved>
                                                    <fixVersion>7.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="5930750" author="xgen-internal-githook" created="Wed, 6 Dec 2023 19:45:36 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Jason Chan&apos;, &apos;email&apos;: &apos;jason.chan@mongodb.com&apos;, &apos;username&apos;: &apos;jasonjhchan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-81821&quot; title=&quot;Document that POS framework doesn&amp;#39;t guarantee Instance::run() is called after construction of instance&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-81821&quot;&gt;&lt;del&gt;SERVER-81821&lt;/del&gt;&lt;/a&gt; Document that POS Instance::run() won&apos;t execute if executor is shutdown&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: 16e0cde891a7d44e8ff850b72197dfdd34b5721d&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e95581b222c82690e730429410183588239debad&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e95581b222c82690e730429410183588239debad&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5753114" author="jason.chan" created="Wed, 4 Oct 2023 18:32:43 +0000"  >&lt;p&gt;Thanks &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=abdul.qadeer%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;abdul.qadeer@mongodb.com&quot;&gt;abdul.qadeer@mongodb.com&lt;/a&gt;, although this is a known problem, I agree we can try to improve the documentation until we find a more complete solution.&lt;/p&gt;</comment>
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