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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>[DRIVERS-818] updateMany without shard key</title>
                <link>https://jira.mongodb.org/browse/DRIVERS-818</link>
                <project id="10980" key="DRIVERS">Drivers</project>
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&lt;p&gt;    Haven&apos;t started scoping yet but suspect this will need drivers changes. &lt;/p&gt;
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&lt;h4&gt;&lt;a name=&quot;Summary&quot;&gt;&lt;/a&gt;Summary&lt;/h4&gt;
&lt;p&gt;This project proposes making updateMany, without a shard key in the filter, work correctly against a sharded collection, for all combinations of ordered:true/false and upsert:true/false. We will consider several ways to implement this - using transactions against all concurrently targeted shards or using two-phase updates where the first phase establishes cursors and the second phase performs the actual updates.&lt;/p&gt;

&lt;h4&gt;&lt;a name=&quot;Motivation&quot;&gt;&lt;/a&gt;Motivation&lt;/h4&gt;
&lt;p&gt;The current implementation of updateMany against a sharded collection doesn&#8217;t work correctly, because it doesn&#8217;t synchronise with chunk migrations and doesn&#8217;t perform chunk filtering. As a result, it has the potential of applying updates to the same document between zero and multiple times. Furthermore, it the upsert:true option requires that a shard key be specified so that a unique shard can be targeted.&lt;/p&gt;

&lt;h4&gt;&lt;a name=&quot;Documentation&quot;&gt;&lt;/a&gt;Documentation&lt;/h4&gt;
&lt;p&gt;&lt;a href=&quot;http://tinyurl.com/y4wvvwq9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Scope Document&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;http://tinyurl.com/yye9kf46&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Technical Design Document&lt;/a&gt;&lt;/p&gt;
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                <environment></environment>
        <key id="1122386">DRIVERS-818</key>
            <summary>updateMany without shard key</summary>
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                                            <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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Thu, 30 Jan 2020 15:38:02 +0000</created>
                <updated>Thu, 14 Oct 2021 22:11:55 +0000</updated>
                            <resolved>Wed, 8 Apr 2020 17:14:35 +0000</resolved>
                                                                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3031434" author="esha.bhargava" created="Wed, 8 Apr 2020 17:14:35 +0000"  >&lt;p&gt;Combined with &lt;a href=&quot;https://jira.mongodb.org/browse/DRIVERS-817&quot; title=&quot;updateOne, updateMany, deleteOne, and findAndModify without shard key&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DRIVERS-817&quot;&gt;&lt;del&gt;DRIVERS-817&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
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