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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-68966] Consider removal of the PlanExecutor::LockPolicy code</title>
                <link>https://jira.mongodb.org/browse/SERVER-68966</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;During earlier SBE development, I recall issues with the LockPolicy::kLocksInternally policy wherein the GlobalLock was not behaving correctly. I believed the decision was made to not use the internal locking policy, so I was concerned when I saw it in the code still: it isn&apos;t clear to me whether or not it&apos;s active or inactive (dead code)? If it&apos;s used for something else now, perhaps the code documentation or class name can be changed to reflect that?&lt;/p&gt;

&lt;p&gt;AutoGetCollection* instances cannot be created and destroyed out of order, in the sense that if AGC-A is created first, in parallel with AGC-B and AGC-C created afterwards, then it must be ensured that AGC-A is destroyed &lt;em&gt;last&lt;/em&gt;. This is because the first AGC instance makes a GlobalLock instance that &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c81e869007aa7658ffdd57aade363b93b0c04278/src/mongo/db/concurrency/d_concurrency.cpp#L141&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;on construction is aware that it was created first&lt;/a&gt; and takes &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c81e869007aa7658ffdd57aade363b93b0c04278/src/mongo/db/concurrency/d_concurrency.h#L227-L231&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ownership of performing work upon destruction&lt;/a&gt;.&lt;/p&gt;</description>
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        <key id="2117427">SERVER-68966</key>
            <summary>Consider removal of the PlanExecutor::LockPolicy code</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                    </labels>
                <created>Thu, 18 Aug 2022 19:58:03 +0000</created>
                <updated>Fri, 27 Oct 2023 13:51:55 +0000</updated>
                            <resolved>Tue, 23 Aug 2022 16:33:01 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4770893" author="dianna.hohensee" created="Tue, 23 Aug 2022 16:32:46 +0000"  >&lt;p&gt;Storch explained to me that the Classic engine doesn&apos;t operate stages in parallel, but rather one at a time, unlike the SBE engine. So there will be one AutoGetCollection* instance at a time for the classic engine. Thus the internal locking policy is OK for classic. Since that&apos;s all that&apos;s in use, closing this ticket.&lt;/p&gt;</comment>
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