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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-62804] Support retention of valid cursor across aggregation and getMore for the $exchange operator</title>
                <link>https://jira.mongodb.org/browse/SERVER-62804</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-60742&quot; title=&quot;Retain valid and positioned cursors across getMores for the aggregation command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60742&quot;&gt;SERVER-60742&lt;/a&gt; implemented support for agg/getMore, but disabled it in the case of $exchange. The issue is that a PlanExecutor can have nested PlanExecutors in their plan trees, and in the case of $exchange the nested PlanExecutor can be shared across multiple ClientCursors &amp;#8211; a mutex protects against concurrent access. So we will need to associate RecoveryUnits with PlanExecutors rather than ClientCursors, and have a mechanism by which we load the appropriate RU onto the opCtx for the duration of the use of an associated PlanExecutor.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1967661">SERVER-62804</key>
            <summary>Support retention of valid cursor across aggregation and getMore for the $exchange operator</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-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                    </labels>
                <created>Thu, 20 Jan 2022 18:15:25 +0000</created>
                <updated>Tue, 6 Dec 2022 00:38:01 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4729976" author="dianna.hohensee" created="Thu, 4 Aug 2022 21:34:49 +0000"  >&lt;p&gt;I think we can probably skip the global RU registry. See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-68575&quot; title=&quot;Investigate how to store storage state with aggregation pipelines that can be shared across ClientCursors (e.g. $exchange)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-68575&quot;&gt;&lt;del&gt;SERVER-68575&lt;/del&gt;&lt;/a&gt;. This problem fix might just fall out of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-60742&quot; title=&quot;Retain valid and positioned cursors across getMores for the aggregation command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60742&quot;&gt;SERVER-60742&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="4719541" author="dianna.hohensee" created="Mon, 1 Aug 2022 20:45:07 +0000"  >&lt;p&gt;Proposed solution:&lt;/p&gt;

&lt;p&gt;We will create a globally accessible RecoveryUnit registry that will hold RUs while idle. The registry will effectively contain a map of some new ID to RecoveryUnit, and each PlanExecutor/ClientCursor will save the ID in order to find the right RecoveryUnit when needed.&lt;/p&gt;

&lt;p&gt;RUs cannot be associated with PlanExecutors because PlanExecutors can be nested; nor can RUs be associated with ClientCursors because ClientCursors can be shared across threads for $exchange. Since there is non 1:1 mapping of storage state to query-level cursor concept, we should place the storage state (RecoveryUnit) by itself to the side until needed.&lt;/p&gt;</comment>
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