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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-37378] Prevent $out to the same namespace as the aggregation for the new modes</title>
                <link>https://jira.mongodb.org/browse/SERVER-37378</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;To avoid a &lt;a href=&quot;https://en.wikipedia.org/wiki/Halloween_Problem&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&quot;Halloween Problem&quot;&lt;/a&gt; scenario, we will prevent writing to a collection with $out while simultaneously reading from that collection as the source aggregation collection. An exception will be made when the mode is &quot;replaceCollection&quot;, because the use of a temporary namespace prevents an infinite loop of reads and writes.&lt;/p&gt;</description>
                <environment></environment>
        <key id="611439">SERVER-37378</key>
            <summary>Prevent $out to the same namespace as the aggregation for the new modes</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="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="devin.hilly@mongodb.com">Devin Hilly</assignee>
                                    <reporter username="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</reporter>
                        <labels>
                    </labels>
                <created>Fri, 28 Sep 2018 16:45:24 +0000</created>
                <updated>Sun, 29 Oct 2023 22:27:49 +0000</updated>
                            <resolved>Thu, 8 Nov 2018 00:54:50 +0000</resolved>
                                                    <fixVersion>4.1.5</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2055295" author="xgen-internal-githook" created="Thu, 8 Nov 2018 00:51:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Devin Hilly&apos;, &apos;email&apos;: &apos;devin.hilly@mongodb.com&apos;, &apos;username&apos;: &apos;dmhilly&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37378&quot; title=&quot;Prevent $out to the same namespace as the aggregation for the new modes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37378&quot;&gt;&lt;del&gt;SERVER-37378&lt;/del&gt;&lt;/a&gt; Prevent $out to the same namespace as the aggregation for the new modes&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/95bfbe8166aa4dd7f45c9869b66cb14f9deabc9f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/95bfbe8166aa4dd7f45c9869b66cb14f9deabc9f&lt;/a&gt;&lt;/p&gt;</comment>
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