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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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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-56737] Provide a separate path for delisting operations</title>
                <link>https://jira.mongodb.org/browse/SERVER-56737</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47802&quot; title=&quot;Destroy opCtx after responding to clients&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47802&quot;&gt;&lt;del&gt;SERVER-47802&lt;/del&gt;&lt;/a&gt; enabled an instance of &lt;tt&gt;ServiceStateMachine&lt;/tt&gt; to postpone destruction of operations (i.e., instances of &lt;tt&gt;OperationContext&lt;/tt&gt;) until after sending responses to the client. This enables partially moving the cost of running &lt;tt&gt;opCtx&lt;/tt&gt; destructor off of the critical path.&lt;/p&gt;

&lt;p&gt;Currently, &lt;tt&gt;ServiceStateMachine&lt;/tt&gt; &lt;a href=&quot;https://github.com/mongodb/mongo/blob/37bb3ea1b31581d8a54c8f5f5f4159b6a669d480/src/mongo/transport/service_state_machine.cpp#L474-L475&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;kills and delists operations&lt;/a&gt; before sinking the response to postpone destruction without impacting the visible state of running operations (e.g., the currentOp output). Killing the operation is currently necessary to ensure any task scheduled on the &lt;tt&gt;opCtx&lt;/tt&gt; baton is drained and the operation cannot be reused.&lt;/p&gt;

&lt;p&gt;However, killing an operation also notifies all &lt;tt&gt;killOpListeners&lt;/tt&gt; (&lt;a href=&quot;https://github.com/mongodb/mongo/blob/37bb3ea1b31581d8a54c8f5f5f4159b6a669d480/src/mongo/db/service_context.cpp#L379-L384&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;see here&lt;/a&gt;), callbacks that are invoked whenever an operation is killed &amp;#8211; and killing operations to postpone their destruction can be very confusing to &lt;tt&gt;killOpListeners&lt;/tt&gt;.&lt;/p&gt;

&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;try&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; {&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        listener-&amp;gt;interrupt(opCtx-&amp;gt;getOpID());&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    } &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;catch&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; (...) {&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        std::terminate();&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    }&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;This ticket should investigate the possibility of providing a separate path for delisting operations in &lt;tt&gt;ServiceStateMachine&lt;/tt&gt; without killing them (e.g., running &lt;tt&gt;killOpListeners&lt;/tt&gt;). Next, it should introduce a new interface to &lt;tt&gt;delist&lt;/tt&gt; operations and replace the usage of &lt;tt&gt;killAndDelistOperation&lt;/tt&gt; in &lt;tt&gt;ServiceStateMachine&lt;/tt&gt; if doing so doesn&apos;t violate any design invariants.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1705565">SERVER-56737</key>
            <summary>Provide a separate path for delisting operations</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="amirsaman.memaripour@mongodb.com">Amirsaman Memaripour</reporter>
                        <labels>
                            <label>sa-remove-fv-backlog-22</label>
                    </labels>
                <created>Thu, 6 May 2021 21:29:00 +0000</created>
                <updated>Tue, 6 Dec 2022 01:19:43 +0000</updated>
                                                                            <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
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            <issuekey id="2169901">SERVER-70960</issuekey>
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                                        <issuelink>
            <issuekey id="1330148">SERVER-47802</issuekey>
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            <issuekey id="1720407">SERVER-57016</issuekey>
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