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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-37150] Aggregation with $out can leak a cursor if the target collection is sharded</title>
                <link>https://jira.mongodb.org/browse/SERVER-37150</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In mongos, we prevent $out to a sharded collection &lt;a href=&quot;https://github.com/mongodb/mongo/blob/3d2124a52216a469f5dbc510c660d6f6cd03184d/src/mongo/s/query/cluster_aggregate.cpp#L837-L840&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;. However if mongos&apos; cache is stale and it believes the collection is unsharded or doesn&apos;t exist, then we will go ahead and establish shard cursors.  &lt;/p&gt;

&lt;p&gt;If the source collection is also sharded, then mongos will also establish a merging cursor which will run the $out on the primary shard.  If this fails (in this case mongod will find the target collection to be sharded and assert &lt;a href=&quot;https://github.com/mongodb/mongo/blob/3d2124a52216a469f5dbc510c660d6f6cd03184d/src/mongo/db/pipeline/document_source_out.cpp#L260-L264&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;) then the original shard cursors will be leaked.&lt;/p&gt;</description>
                <environment></environment>
        <key id="605076">SERVER-37150</key>
            <summary>Aggregation with $out can leak a cursor if the target collection is sharded</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</reporter>
                        <labels>
                    </labels>
                <created>Fri, 14 Sep 2018 19:14:42 +0000</created>
                <updated>Tue, 6 Dec 2022 03:18:32 +0000</updated>
                            <resolved>Fri, 14 Sep 2018 19:22:47 +0000</resolved>
                                                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2003578" author="nicholas.zolnierz" created="Fri, 14 Sep 2018 19:22:32 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kyle.suarez&quot; class=&quot;user-hover&quot; rel=&quot;kyle.suarez&quot;&gt;kyle.suarez&lt;/a&gt; ahh yeah good call, I guess this will provide an easy repro too.&lt;/p&gt;</comment>
                            <comment id="2003575" author="kyle.suarez" created="Fri, 14 Sep 2018 19:21:28 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=nicholas.zolnierz&quot; class=&quot;user-hover&quot; rel=&quot;nicholas.zolnierz&quot;&gt;nicholas.zolnierz&lt;/a&gt;, can we just fold this ticket into &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36911&quot; title=&quot;Ensure that cluster aggregations that fail clean up cursors&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36911&quot;&gt;&lt;del&gt;SERVER-36911&lt;/del&gt;&lt;/a&gt;?&lt;/p&gt;</comment>
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