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    <title>MongoDB Jira</title>
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    <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-65534] $documents doesn&apos;t work if a later stage needs to run on a shard (not mongos)</title>
                <link>https://jira.mongodb.org/browse/SERVER-65534</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This limits the applicability, and is preventing another internal use case for $documents from working.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2024092">SERVER-65534</key>
            <summary>$documents doesn&apos;t work if a later stage needs to run on a shard (not mongos)</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="chii.huang@mongodb.com">Chi-I Huang</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Wed, 13 Apr 2022 11:27:39 +0000</created>
                <updated>Fri, 2 Feb 2024 10:35:49 +0000</updated>
                            <resolved>Thu, 21 Sep 2023 18:33:08 +0000</resolved>
                                                    <fixVersion>7.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="5909179" author="xgen-internal-githook" created="Tue, 28 Nov 2023 15:20:07 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;rakiz&apos;, &apos;email&apos;: &apos;sebastien.mendez@mongodb.com&apos;, &apos;username&apos;: &apos;rakiz&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-83461&quot; title=&quot;Pipeline::canRunOnMongos triggers invariant failure because targeting answer differs from AggregationTargeter::make()&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-83461&quot;&gt;&lt;del&gt;SERVER-83461&lt;/del&gt;&lt;/a&gt; Crash-&amp;gt;throw on requiredToRunOnMongos/canRunOnMongos conflict&lt;/p&gt;

&lt;p&gt;Since &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65534&quot; title=&quot;$documents doesn&amp;#39;t work if a later stage needs to run on a shard (not mongos)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65534&quot;&gt;&lt;del&gt;SERVER-65534&lt;/del&gt;&lt;/a&gt; pipelines starting with the &apos;$queue&apos; stage must run on&lt;br/&gt;
mongoS when no &apos;CollectionRoutingInfo&apos; is available. This, however, can&lt;br/&gt;
result in an invariant failure, because some pipelines starting with the&lt;br/&gt;
&apos;$queue&apos; stage may still not be allowed to run on mongoS.&lt;/p&gt;

&lt;p&gt;In this fix we replace the invariant with a &apos;uassert&apos;, which was already&lt;br/&gt;
there, but did not cover the case introduced in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65534&quot; title=&quot;$documents doesn&amp;#39;t work if a later stage needs to run on a shard (not mongos)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65534&quot;&gt;&lt;del&gt;SERVER-65534&lt;/del&gt;&lt;/a&gt;.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/214fe871cc32544cbc63f1d85ff9ca8c785bcc78&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/214fe871cc32544cbc63f1d85ff9ca8c785bcc78&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5722218" author="xgen-internal-githook" created="Thu, 21 Sep 2023 18:27:09 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Chi-I Huang&apos;, &apos;email&apos;: &apos;chii.huang@mongodb.com&apos;, &apos;username&apos;: &apos;chiihuang&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65534&quot; title=&quot;$documents doesn&amp;#39;t work if a later stage needs to run on a shard (not mongos)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65534&quot;&gt;&lt;del&gt;SERVER-65534&lt;/del&gt;&lt;/a&gt; Introduce host requirement kRunOnceAnyNode for $documents&lt;/p&gt;

&lt;p&gt;Running db.aggregate([{$documents: &lt;span class=&quot;error&quot;&gt;&amp;#91;{}&amp;#93;&lt;/span&gt;}, {$out: &quot;test&quot;}]) on mongos will fail because the host requirement of $queue kLocalOnly is translated to kMongoS, which conflicts with the requirement of $out which needs kPrimaryShard. In other words, kLocalOnly and kPrimaryShard cannot coexist in the same pipeline.&lt;/p&gt;

&lt;p&gt;To avoid the conflict, this PR introduces a new requirement HostTypeRequirement::kRunOnceAnyNode which works well with kPrimaryShard.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7fd370bbe0236b26340d765480147fd9c0f13797&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7fd370bbe0236b26340d765480147fd9c0f13797&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4499649" author="JIRAUSER1257467" created="Fri, 22 Apr 2022 13:09:40 +0000"  >&lt;p&gt;Passing to Product for guidance on priority&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="2560306">SERVER-85892</issuekey>
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            <issuekey id="2000586">SERVER-64480</issuekey>
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            <issuekey id="2026102">SERVER-65692</issuekey>
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&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.aggregate([{$documents: [{}]}, {$out: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;write it down&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;}])&lt;/span&gt;&lt;/pre&gt;
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