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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-36911] Ensure that cluster aggregations that fail clean up cursors</title>
                <link>https://jira.mongodb.org/browse/SERVER-36911</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When setting up a non-passthrough cluster aggregation, mongos establishes cursors on the targeted shards that will be used by the merging portion of the pipeline. We must ensure that, if the aggregation fails during planning, we appropriately clean up cursors and do not leak them.&lt;/p&gt;

&lt;p&gt;As part of this work, we&apos;ll also write tests that deliberately force a failure and assert that cursors are cleaned up appropriately.&lt;/p&gt;</description>
                <environment></environment>
        <key id="596202">SERVER-36911</key>
            <summary>Ensure that cluster aggregations that fail clean up cursors</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="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</assignee>
                                    <reporter username="kyle.suarez@mongodb.com">Kyle Suarez</reporter>
                        <labels>
                    </labels>
                <created>Tue, 28 Aug 2018 20:20:21 +0000</created>
                <updated>Sun, 29 Oct 2023 22:28:34 +0000</updated>
                            <resolved>Thu, 4 Oct 2018 14:06:20 +0000</resolved>
                                                    <fixVersion>4.1.4</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="2024274" author="xgen-internal-githook" created="Thu, 4 Oct 2018 20:18:38 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Nick Zolnierz&apos;, &apos;email&apos;: &apos;nicholas.zolnierz@mongodb.com&apos;, &apos;username&apos;: &apos;nzolnierzmdb&apos;}
&lt;p&gt;Message: &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;: Relax assertions in agg cleanup test to fix failures on slow machines&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bfadbd1d340278e056547c9b94160e51410cfced&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bfadbd1d340278e056547c9b94160e51410cfced&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2023512" author="xgen-internal-githook" created="Thu, 4 Oct 2018 14:06:00 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Nick Zolnierz&apos;, &apos;email&apos;: &apos;nicholas.zolnierz@mongodb.com&apos;, &apos;username&apos;: &apos;nzolnierzmdb&apos;}
&lt;p&gt;Message: &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;: Ensure that cluster aggregations that fail clean up cursors&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/68fe3afd3b7b3037a18deea5c063256027e5e029&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/68fe3afd3b7b3037a18deea5c063256027e5e029&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2008370" author="charlie.swanson" created="Wed, 19 Sep 2018 20:10:34 +0000"  >&lt;p&gt;For the record, we noticed that one of our new $out tests added a scenario that would leak a cursor. If parsing fails on the shards but not on the mongos - we will leak the cursors from the first (&apos;shards&apos;) half of the pipeline. This shouldn&apos;t usually happen, but it can happen in rare cases where extra validation checks are performed during parsing (like verifying the collection is not sharded) that can have different results on the shards vs. the mongos.&lt;/p&gt;</comment>
                            <comment id="1994480" author="kyle.suarez" created="Wed, 5 Sep 2018 21:27:29 +0000"  >&lt;p&gt;For now, we&apos;re going to keep this in the $out epic but will put it on the backlog. While it&apos;s true that an $exchange would cause more cursors to be open (and therefore have a bigger impact in the event they were leaked), this is a condition that exists today. The latest plan will not cause stale sharding metadata exceptions to be raised during cluster aggregation planning after cursors have been established.&lt;/p&gt;</comment>
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            <issuekey id="605076">SERVER-37150</issuekey>
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            <issuekey id="584970">SERVER-36482</issuekey>
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