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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-47581] mongoS does not set &apos;useNewUpsert&apos; on $mergeCursors pipelines [4.4, 4.2]</title>
                <link>https://jira.mongodb.org/browse/SERVER-47581</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43860&quot; title=&quot;Pipeline style update in $merge can produce unexpected result&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43860&quot;&gt;&lt;del&gt;SERVER-43860&lt;/del&gt;&lt;/a&gt;, we fixed the behaviour of &lt;tt&gt;$merge&lt;/tt&gt; in the case where we have {&lt;tt&gt;whenMatched: pipeline&lt;/tt&gt;} and {&lt;tt&gt;whenNotMatched: insert&lt;/tt&gt;}. For upgrade/downgrade purposes, we made this new behaviour conditional on the presence of a flag, &lt;tt&gt;useNewUpsert&lt;/tt&gt;, which is set by 4.4 mongoS on aggregations that are sent to the shards. We then backported this fix to 4.2.2.&lt;/p&gt;

&lt;p&gt;However, in cases where a &lt;tt&gt;$merge&lt;/tt&gt; is sent to a shard as part of a &lt;tt&gt;$mergeCursors&lt;/tt&gt; pipeline, the &apos;useNewUpsert&apos; flag is &lt;b&gt;not&lt;/b&gt; set on the command. In these scenarios, the old incorrect behaviour is still observed.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1316668">SERVER-47581</key>
            <summary>mongoS does not set &apos;useNewUpsert&apos; on $mergeCursors pipelines [4.4, 4.2]</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="bernard.gorman@mongodb.com">Bernard Gorman</assignee>
                                    <reporter username="bernard.gorman@mongodb.com">Bernard Gorman</reporter>
                        <labels>
                    </labels>
                <created>Thu, 16 Apr 2020 01:35:47 +0000</created>
                <updated>Sun, 29 Oct 2023 22:09:26 +0000</updated>
                            <resolved>Wed, 22 Apr 2020 16:40:50 +0000</resolved>
                                                    <fixVersion>4.2.7</fixVersion>
                    <fixVersion>4.4.0-rc3</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3066361" author="xgen-internal-githook" created="Mon, 4 May 2020 00:25:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Bernard Gorman&apos;, &apos;email&apos;: &apos;bernard.gorman@gmail.com&apos;, &apos;username&apos;: &apos;gormanb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47581&quot; title=&quot;mongoS does not set &amp;#39;useNewUpsert&amp;#39; on $mergeCursors pipelines [4.4, 4.2]&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47581&quot;&gt;&lt;del&gt;SERVER-47581&lt;/del&gt;&lt;/a&gt; Set &apos;useNewUpsert&apos; on $mergeCursors aggregations&lt;/p&gt;

&lt;p&gt;(cherry picked from commit dda2fb45cbf624c9270f8fad7f3c5c5a2f0834eb)&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1abf05a44fbb0d072ebdb3fb133e35e0c17c57e3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1abf05a44fbb0d072ebdb3fb133e35e0c17c57e3&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3051258" author="xgen-internal-githook" created="Wed, 22 Apr 2020 16:36:28 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Bernard Gorman&apos;, &apos;email&apos;: &apos;bernard.gorman@gmail.com&apos;, &apos;username&apos;: &apos;gormanb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47344&quot; title=&quot;agg_merge_upsert_supplied_cluster.js failure due to unsupported downgrade version&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47344&quot;&gt;&lt;del&gt;SERVER-47344&lt;/del&gt;&lt;/a&gt; Change agg_merge_upsert_supplied_cluster.js to avoid downgrade to 4.2.1 &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47581&quot; title=&quot;mongoS does not set &amp;#39;useNewUpsert&amp;#39; on $mergeCursors pipelines [4.4, 4.2]&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47581&quot;&gt;&lt;del&gt;SERVER-47581&lt;/del&gt;&lt;/a&gt; Set &apos;useNewUpsert&apos; on $mergeCursors aggregations&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/dda2fb45cbf624c9270f8fad7f3c5c5a2f0834eb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/dda2fb45cbf624c9270f8fad7f3c5c5a2f0834eb&lt;/a&gt;&lt;/p&gt;</comment>
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