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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-79613] Client cursors aren&apos;t killed during stepdown if part of a transaction</title>
                <link>https://jira.mongodb.org/browse/SERVER-79613</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As the title says, client cursors aren&apos;t killed during a stepdown if they are part of a multi-document transaction. With the move to shard role acquisitions this has the potential to hold orphan shard ranges from being removed.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2407185">SERVER-79613</key>
            <summary>Client cursors aren&apos;t killed during stepdown if part of a transaction</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="jordi.olivares-provencio@mongodb.com">Jordi Olivares Provencio</assignee>
                                    <reporter username="jordi.olivares-provencio@mongodb.com">Jordi Olivares Provencio</reporter>
                        <labels>
                    </labels>
                <created>Wed, 2 Aug 2023 15:10:09 +0000</created>
                <updated>Fri, 27 Oct 2023 13:51:31 +0000</updated>
                            <resolved>Thu, 3 Aug 2023 12:39:06 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5610007" author="JIRAUSER1264163" created="Thu, 3 Aug 2023 12:38:59 +0000"  >&lt;p&gt;As per the agreement reached in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35217&quot; title=&quot;killSessions command attempts to kill a transaction while holding SessionCatalog::_mutex, which leads to deadlock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35217&quot;&gt;&lt;del&gt;SERVER-35217&lt;/del&gt;&lt;/a&gt; (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35217?focusedCommentId=1912617&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-1912617&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;comment in particular&lt;/a&gt;) this is essentially a Driver issue. Idle sessions and cursors get periodically reaped asynchronously.&lt;/p&gt;

&lt;p&gt;Additionally, there are concerns of eagerly closing cursors that are part of a transaction. In particular, the current CursorManager code needs to perform a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/dfe4462effd56d58abb613d560458f5091e9cb45/src/mongo/db/cursor_manager.cpp#L329&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;full scan of all cursors&lt;/a&gt; if we want to close cursors pertaining to a session in particular. This blocks all new user operations, which could be a potentially significant latency hiccup.&lt;/p&gt;

&lt;p&gt;As a result of all of this, we are closing this as Works as Designed since we will rely on the asynchronous cleanup process that already exists today.&lt;/p&gt;</comment>
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