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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-10452] Unify mongos cursor cache, remove explicit distinction between unsharded and sharded cursors</title>
                <link>https://jira.mongodb.org/browse/SERVER-10452</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;... since distinguishing between sharded and unsharded collections in mongos is nontrivial and not correct when the sharding status changes.  This also interferes with aggregation, since cursor type does not necessarily correspond to input collection sharding state.&lt;/p&gt;</description>
                <environment></environment>
        <key id="84996">SERVER-10452</key>
            <summary>Unify mongos cursor cache, remove explicit distinction between unsharded and sharded cursors</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="greg_10gen">Greg Studer</reporter>
                        <labels>
                    </labels>
                <created>Wed, 7 Aug 2013 14:03:09 +0000</created>
                <updated>Tue, 6 Dec 2022 05:18:56 +0000</updated>
                            <resolved>Fri, 24 Aug 2018 15:30:41 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1984950" author="ian@10gen.com" created="Fri, 24 Aug 2018 15:30:41 +0000"  >&lt;p&gt;Although it would be desirable to share code between mongod and mongos cursor managers, we&apos;re not going to pursue that right now.  the part of this ticket about sharded/unsharded cursors no longer applies due to the rewrite in 3.2.&lt;/p&gt;</comment>
                            <comment id="1983845" author="kaloian.manassiev" created="Thu, 23 Aug 2018 15:01:22 +0000"  >&lt;p&gt;I know in 3.2 we did some work on the mongos query execution path, but not sure if that unified the cursor managers. Passing on to query.&lt;/p&gt;</comment>
                            <comment id="398938" author="auto" created="Thu, 8 Aug 2013 19:49:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;gregstuder&apos;, u&apos;name&apos;: u&apos;Greg Studer&apos;, u&apos;email&apos;: u&apos;greg@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-10452&quot; title=&quot;Unify mongos cursor cache, remove explicit distinction between unsharded and sharded cursors&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-10452&quot;&gt;&lt;del&gt;SERVER-10452&lt;/del&gt;&lt;/a&gt; mongos should select cursor based on cursorid, not sharding state&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/17b3f0fa4e42735c2d233984bf61fab87b49dde3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/17b3f0fa4e42735c2d233984bf61fab87b49dde3&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Fix here is not 100% solution to this, we want to unify the getMore codepaths further and make the ShardedCursorCache saner.&lt;/p&gt;

&lt;p&gt;The patch above is the minimal fix needed for aggregated cursors to work.&lt;/p&gt;
</comment>
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