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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-36779] Election handoff schedules a network request under ReplCoord mutex</title>
                <link>https://jira.mongodb.org/browse/SERVER-36779</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It looks like &lt;tt&gt;ReplicationCoordinatorImpl::_performElectionHandoff()&lt;/tt&gt; is &lt;a href=&quot;https://github.com/mongodb/mongo/blob/eb4df9f2f06a0c5dc6c07231f3de7d2cbb674ee9/src/mongo/db/repl/replication_coordinator_impl.cpp#L1831-L1843&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;waiting for a remote command&lt;/a&gt; while &lt;a href=&quot;https://github.com/mongodb/mongo/blob/eb4df9f2f06a0c5dc6c07231f3de7d2cbb674ee9/src/mongo/db/repl/replication_coordinator_impl.cpp#L1819&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;holding the repl coord mutex&lt;/a&gt;.  Or have I missed something?&lt;/p&gt;

&lt;p&gt;In addition, &lt;tt&gt;_performElectionHandoff()&lt;/tt&gt; is only called from inside &lt;tt&gt;ReplicationCoordinatorImpl::stepDown()&lt;/tt&gt;, and my reading of that function is that the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/eb4df9f2f06a0c5dc6c07231f3de7d2cbb674ee9/src/mongo/db/repl/replication_coordinator_impl.cpp#L1676-L1680&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;global lock&lt;/a&gt; will also be held &lt;a href=&quot;https://github.com/mongodb/mongo/blob/eb4df9f2f06a0c5dc6c07231f3de7d2cbb674ee9/src/mongo/db/repl/replication_coordinator_impl.cpp#L1813&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;while &lt;tt&gt;_performElectionHandoff&lt;/tt&gt; is called&lt;/a&gt; (although earlier it gets &lt;a href=&quot;https://github.com/mongodb/mongo/blob/eb4df9f2f06a0c5dc6c07231f3de7d2cbb674ee9/src/mongo/db/repl/replication_coordinator_impl.cpp#L1767-L1768&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;released&lt;/a&gt;, it then gets &lt;a href=&quot;https://github.com/mongodb/mongo/blob/eb4df9f2f06a0c5dc6c07231f3de7d2cbb674ee9/src/mongo/db/repl/replication_coordinator_impl.cpp#L1785-L1786&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;reacquired&lt;/a&gt;).&lt;/p&gt;

&lt;p&gt;This code was added in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35623&quot; title=&quot;Send a replSetStepUp command to an eligible candidate on stepdown&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35623&quot;&gt;&lt;del&gt;SERVER-35623&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="591415">SERVER-36779</key>
            <summary>Election handoff schedules a network request under ReplCoord mutex</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="siyuan.zhou@mongodb.com">Siyuan Zhou</assignee>
                                    <reporter username="kevin.pulo@mongodb.com">Kevin Pulo</reporter>
                        <labels>
                    </labels>
                <created>Tue, 21 Aug 2018 08:24:39 +0000</created>
                <updated>Fri, 27 Oct 2023 13:53:35 +0000</updated>
                            <resolved>Tue, 21 Aug 2018 19:10:46 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>1</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="1982001" author="kevin.pulo@10gen.com" created="Wed, 22 Aug 2018 00:26:10 +0000"  >&lt;p&gt;Yep, sorry about that &amp;#8212; somehow I misread the &lt;tt&gt;getStatus()&lt;/tt&gt; as &quot;wait and return the remote&apos;s response&quot;.  There was no direct failure observed around this.&lt;/p&gt;</comment>
                            <comment id="1981655" author="siyuan.zhou@10gen.com" created="Tue, 21 Aug 2018 19:09:29 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kevin.pulo&quot; class=&quot;user-hover&quot; rel=&quot;kevin.pulo&quot;&gt;kevin.pulo&lt;/a&gt;, did you observe any failure around this code? &lt;tt&gt;_performElectionHandoff()&lt;/tt&gt; &lt;b&gt;schedules&lt;/b&gt; the command to be sent in a fire-and-forget manner and doesn&apos;t wait for it to finish, so it&apos;s fast and safe to run while holding the mutex or global lock. I&apos;m changing the title and closing this ticket as &quot;Works as designed&quot;.&lt;/p&gt;</comment>
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            <issuekey id="560138">SERVER-35623</issuekey>
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