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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>[GODRIVER-1782] Aggregation with $out not always sent to primary</title>
                <link>https://jira.mongodb.org/browse/GODRIVER-1782</link>
                <project id="14289" key="GODRIVER">Go Driver</project>
                    <description>&lt;p&gt;Based on the check &lt;a href=&quot;https://github.com/mongodb/mongo-go-driver/blob/master/mongo/collection.go#L781&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;, the read preference should not be set for an aggregation that contains a $out (or $merge). However, when the pipeline is &lt;a href=&quot;https://github.com/mongodb/mongo-go-driver/blob/master/mongo/mongo.go#L309&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;checked for a $out stage here&lt;/a&gt;, it does &lt;tt&gt;LookupErr(&quot;$out&quot;)&lt;/tt&gt; on an array document that looks like this:&lt;/p&gt;
&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;
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				&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;{&quot;0&quot;: {&quot;$out&quot;: {&quot;db&quot;: &quot;test_db&quot;,&quot;coll&quot;: &quot;test_dcoll&quot;}}}&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;So no top-level $out is found, and the readPref is being set, resulting in a potential error on $out.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1535926">GODRIVER-1782</key>
            <summary>Aggregation with $out not always sent to primary</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="isabella.siu@mongodb.com">Isabella Siu</assignee>
                                    <reporter username="daniel.ernst@mongodb.com">Daniel Ernst</reporter>
                        <labels>
                    </labels>
                <created>Fri, 6 Nov 2020 16:06:37 +0000</created>
                <updated>Sat, 28 Oct 2023 11:38:00 +0000</updated>
                            <resolved>Tue, 24 Nov 2020 21:12:51 +0000</resolved>
                                                    <fixVersion>1.4.4</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3504361" author="xgen-internal-githook" created="Tue, 24 Nov 2020 21:12:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Isabella Siu&apos;, &apos;email&apos;: &apos;isabella.siu@mongodb.com&apos;, &apos;username&apos;: &apos;iwysiu&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/GODRIVER-1782&quot; title=&quot;Aggregation with $out not always sent to primary&quot; class=&quot;issue-link&quot; data-issue-key=&quot;GODRIVER-1782&quot;&gt;&lt;del&gt;GODRIVER-1782&lt;/del&gt;&lt;/a&gt; correctly mark aggregation pipeline with $out (#537)&lt;br/&gt;
Branch: release/1.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-go-driver/commit/60824655b5a6fa3690f8066fe9a5c424029a0d29&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-go-driver/commit/60824655b5a6fa3690f8066fe9a5c424029a0d29&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3504277" author="xgen-internal-githook" created="Tue, 24 Nov 2020 20:33:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Isabella Siu&apos;, &apos;email&apos;: &apos;isabella.siu@mongodb.com&apos;, &apos;username&apos;: &apos;iwysiu&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/GODRIVER-1782&quot; title=&quot;Aggregation with $out not always sent to primary&quot; class=&quot;issue-link&quot; data-issue-key=&quot;GODRIVER-1782&quot;&gt;&lt;del&gt;GODRIVER-1782&lt;/del&gt;&lt;/a&gt; correctly mark aggregation pipeline with $out (#537)&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-go-driver/commit/c4dde16ec1400fe53d3100d8c370bbd7e14e939f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-go-driver/commit/c4dde16ec1400fe53d3100d8c370bbd7e14e939f&lt;/a&gt;&lt;/p&gt;</comment>
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