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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-65259] Cursor leak in aggregation that requires merging on shard</title>
                <link>https://jira.mongodb.org/browse/SERVER-65259</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Consider an aggregation that requires merging on a shard. First, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a91436f2dff19f1ea7cc69bb00531f9bcaaaa681/src/mongo/s/query/cluster_aggregation_planner.cpp#L675-L677&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongos opens the split cursors on the shards&lt;/a&gt;. Later, in order to establish the merge cursor, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a91436f2dff19f1ea7cc69bb00531f9bcaaaa681/src/mongo/s/query/cluster_aggregation_planner.cpp#L717&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;dispatchMergingPipeline is called and the split cursors ownership is transferred to it&lt;/a&gt;. There, sharded_agg_helpers::addMergeCursorsSource will &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a91436f2dff19f1ea7cc69bb00531f9bcaaaa681/src/mongo/db/pipeline/sharded_agg_helpers.cpp#L1203-L1216&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;transfer the split cursors ownership to the merge pipeline&lt;/a&gt;. Finally, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a91436f2dff19f1ea7cc69bb00531f9bcaaaa681/src/mongo/s/query/cluster_aggregation_planner.cpp#L223-L224&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the merge cursor will be established&lt;/a&gt;. However, if this fails (for instance if the shard is in the middle of a migration critical section), &apos;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/a91436f2dff19f1ea7cc69bb00531f9bcaaaa681/src/mongo/s/query/cluster_aggregation_planner.cpp#L228&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;storePossibleCursor&lt;/a&gt;&apos; will &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a91436f2dff19f1ea7cc69bb00531f9bcaaaa681/src/mongo/s/query/store_possible_cursor.cpp#L83&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;return here&lt;/a&gt; and then &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a91436f2dff19f1ea7cc69bb00531f9bcaaaa681/src/mongo/s/query/cluster_aggregation_planner.cpp#L242&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the split cursors ownership is dismissed from the mergePipeline&lt;/a&gt;. However, because the merge cursor was not really established, the shard did not take ownership of those cursors either, so they are leaked.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2016991">SERVER-65259</key>
            <summary>Cursor leak in aggregation that requires merging on shard</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="13201">Fixed</resolution>
                                        <assignee username="mickey.winters@mongodb.com">Mickey Winters</assignee>
                                    <reporter username="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</reporter>
                        <labels>
                    </labels>
                <created>Tue, 5 Apr 2022 13:38:10 +0000</created>
                <updated>Sun, 29 Oct 2023 21:40:00 +0000</updated>
                            <resolved>Wed, 21 Sep 2022 21:39:27 +0000</resolved>
                                                    <fixVersion>4.4.19</fixVersion>
                    <fixVersion>5.0.15</fixVersion>
                    <fixVersion>6.0.4</fixVersion>
                    <fixVersion>6.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="5061278" author="xgen-internal-githook" created="Fri, 16 Dec 2022 20:29:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mickey. J Winters&apos;, &apos;email&apos;: &apos;mickey.winters@mongodb.com&apos;, &apos;username&apos;: &apos;mjrb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65259&quot; title=&quot;Cursor leak in aggregation that requires merging on shard&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65259&quot;&gt;&lt;del&gt;SERVER-65259&lt;/del&gt;&lt;/a&gt; fix cursor leak in aggregation that requires merging on shard&lt;/p&gt;

&lt;p&gt;(cherry-picked from commit 7f40c171562cb8de1dfae04368ca54e44a193f96)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6530690040dca4c52b78b2f268e31bf11a015131&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6530690040dca4c52b78b2f268e31bf11a015131&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5061193" author="xgen-internal-githook" created="Fri, 16 Dec 2022 19:56:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mickey. J Winters&apos;, &apos;email&apos;: &apos;mickey.winters@mongodb.com&apos;, &apos;username&apos;: &apos;mjrb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65259&quot; title=&quot;Cursor leak in aggregation that requires merging on shard&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65259&quot;&gt;&lt;del&gt;SERVER-65259&lt;/del&gt;&lt;/a&gt; fix cursor leak in aggregation that requires merging on shard&lt;/p&gt;

&lt;p&gt;(cherry-picked from commit 7f40c171562cb8de1dfae04368ca54e44a193f96)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ca6b6dc8eb0a0bd527f812f4fb1196794ccd1a83&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ca6b6dc8eb0a0bd527f812f4fb1196794ccd1a83&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5058431" author="xgen-internal-githook" created="Thu, 15 Dec 2022 19:35:29 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mickey. J Winters&apos;, &apos;email&apos;: &apos;mickey.winters@mongodb.com&apos;, &apos;username&apos;: &apos;mjrb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65259&quot; title=&quot;Cursor leak in aggregation that requires merging on shard&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65259&quot;&gt;&lt;del&gt;SERVER-65259&lt;/del&gt;&lt;/a&gt; fix cursor leak in aggregation that requires merging on shard&lt;/p&gt;

&lt;p&gt;(cherry-picked from commit 7f40c171562cb8de1dfae04368ca54e44a193f96)&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b953dbf36cba018c98a407d362580ed9ed9b9d23&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b953dbf36cba018c98a407d362580ed9ed9b9d23&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4842710" author="mickey.winters" created="Tue, 20 Sep 2022 17:56:32 +0000"  >&lt;p&gt;Because &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6036&quot; title=&quot;Disable cursor timeout for cursors that belong to a session&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6036&quot;&gt;&lt;del&gt;SERVER-6036&lt;/del&gt;&lt;/a&gt; was not backported to 4.2 I think this isn&apos;t an issue on 4.2 because eventually the cursor would be timed out and killed&lt;/p&gt;</comment>
                            <comment id="4835177" author="xgen-internal-githook" created="Fri, 16 Sep 2022 21:22:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mickey. J Winters&apos;, &apos;email&apos;: &apos;mickey.winters@mongodb.com&apos;, &apos;username&apos;: &apos;mjrb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65259&quot; title=&quot;Cursor leak in aggregation that requires merging on shard&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65259&quot;&gt;&lt;del&gt;SERVER-65259&lt;/del&gt;&lt;/a&gt; fix cursor leak in aggregation that requires merging on shard&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7f40c171562cb8de1dfae04368ca54e44a193f96&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7f40c171562cb8de1dfae04368ca54e44a193f96&lt;/a&gt;&lt;/p&gt;</comment>
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                            <attachment id="370600" name="0001-Repro-SERVER-65259.patch" size="5535" author="jordi.serra-torrens@mongodb.com" created="Tue, 5 Apr 2022 13:40:33 +0000"/>
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