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    <title>MongoDB Jira</title>
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    <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-83914] Ensure safe SessionCatalog initialization and use in embedded router mode</title>
                <link>https://jira.mongodb.org/browse/SERVER-83914</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We need to ensure and document the access-pattern and types that will be used to represent the SessionCatalog when mongod is running in embedded router mode. I think it is safe to only have one in-memory SessionCatalog, and re-use the existing MongodSessionCatalog. We will just need to ensure that the reaping functionality in the RouterSessionCatalog here: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a37dd902790b062a41fa87aacf57adce8ba503e6/src/mongo/s/session_catalog_router.cpp#L45&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/a37dd902790b062a41fa87aacf57adce8ba503e6/src/mongo/s/session_catalog_router.cpp#L45&lt;/a&gt; is preserved, that all Router operations use RouterOperationContextSession, and that yielding is performed when needed to ensure we don&apos;t deadlock trying to check out a session we already are using. &lt;/p&gt;

&lt;p&gt;This ticket tracks whatever code changes are necessary to initialize and use the SessionCatalog correctly in embedded router mode, as well as documenting the decision and explaining it in the arch guide or elsewhere. &lt;/p&gt;</description>
                <environment></environment>
        <key id="2517090">SERVER-83914</key>
            <summary>Ensure safe SessionCatalog initialization and use in embedded router mode</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="pol.pinol@mongodb.com">Pol Pinol</assignee>
                                    <reporter username="george.wangensteen@mongodb.com">George Wangensteen</reporter>
                        <labels>
                            <label>pm-635-milestone-1</label>
                    </labels>
                <created>Tue, 5 Dec 2023 19:46:53 +0000</created>
                <updated>Tue, 23 Jan 2024 10:59:10 +0000</updated>
                            <resolved>Tue, 23 Jan 2024 10:59:10 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="6033749" author="JIRAUSER1271605" created="Tue, 23 Jan 2024 10:57:45 +0000"  >&lt;p&gt;This ticket can be closed as Works as Designed because there is no work to do in for the SessionCatalog in an embedded router world.&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;SessionCatalog is an API that is shared both by the shard and router.&lt;/li&gt;
	&lt;li&gt;Then, we have the MongoDSessionCatalog only used by the shard. It is important to note that it is not an implementation of the SessionCatalog for the mongod, it is only an extension of the API that still uses the former SessionCatalog.&lt;/li&gt;
	&lt;li&gt;And last, the RouterSessionCatalog. This only owns the implementation for &apos;reapSessionsOlderThan&apos;, that we already combined in the LogicalSessionCache&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The only &quot;remaining&quot; work is to properly handle &apos;reapSessionolderThan&apos;, that it is included in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-83915&quot; title=&quot;Ensure safe initialization and use of LogicalSessionCache in embedded router mode&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-83915&quot;&gt;&lt;del&gt;SERVER-83915&lt;/del&gt;&lt;/a&gt; scope.&lt;/p&gt;</comment>
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