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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-4563] simplify ClientCursor lifecycle</title>
                <link>https://jira.mongodb.org/browse/SERVER-4563</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently there are a multiple ways to yield, hold a pointer to a client cursor, delete/erase a client cursor, etc and in some cases these alternative routines have different nonobvious properties.  I think some of these implementations can be unified and their operations can be simplified.&lt;/p&gt;

&lt;p&gt;Also the current implementation will explicitly delete a ClientCursor object once it becomes invalid, often leaving dangling invalid pointers that must be handled properly.  This can make yielding and other ClientCursor operations more difficult to implement than necessary.&lt;/p&gt;</description>
                <environment></environment>
        <key id="27269">SERVER-4563</key>
            <summary>simplify ClientCursor lifecycle</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="9">Done</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="aaron">Aaron Staple</reporter>
                        <labels>
                    </labels>
                <created>Tue, 27 Dec 2011 00:17:20 +0000</created>
                <updated>Tue, 6 Dec 2022 05:38:02 +0000</updated>
                            <resolved>Thu, 7 Feb 2019 16:08:07 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="2136523" author="david.storch" created="Mon, 4 Feb 2019 15:00:51 +0000"  >&lt;p&gt;We&apos;ve made many improvements to ClientCursor, ClientCursorPin, and CursorManager since this ticket was filed ~7 years ago. I think this can be safely closed as &quot;Gone Away&quot;, but I&apos;m flagging for scheduling first so that the Query Team can assess together.&lt;/p&gt;</comment>
                            <comment id="253092" author="aaron" created="Tue, 29 Jan 2013 19:29:11 +0000"  >&lt;p&gt;As part of this we might want to merge ClientCursor::Pin and ClientCursor::Holder.  All cases of ClientCursor usage likely have the same functional requirements.  In particular this will fix &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-8369&quot; title=&quot;kill cursor of an internal only ClientCursor used for yielding could cause memory corruption&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-8369&quot;&gt;&lt;del&gt;SERVER-8369&lt;/del&gt;&lt;/a&gt; and make processGetMore erase its ClientCursors while they are pinned, which will make the ClientCursor lifecycle easier to reason about.&lt;/p&gt;</comment>
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