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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>[COMPASS-7468] Investigate changes in PM-3209: Block balancing during updateMany</title>
                <link>https://jira.mongodb.org/browse/COMPASS-7468</link>
                <project id="13182" key="COMPASS">Compass </project>
                    <description>    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Original Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    There are two potential downstream concerns from the implementation of this project.&lt;/p&gt;

&lt;p&gt;1. This project adds a cluster parameter called &quot;pauseMigrationsDuringMultiUpdates&quot;. This parameter will mark updateMany and deleteMany as migration blocking operations while enabled.&lt;/p&gt;

&lt;p&gt;2. This project adds the cluster parameter document representing &quot;pauseMigrationsDuringMultiUpdates&quot; to the output of serverStatus. &lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
    &lt;div class=&quot;panel&quot; style=&quot;background-color: #e3fcf7;border-color: #00684a;border-style: solid;border-width: 2px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 2px;border-bottom-style: solid;border-bottom-color: #00684a;background-color: #00684a;&quot;&gt;&lt;b&gt;Epic Summary&lt;/b&gt;&lt;/div&gt;&lt;/div&gt;
&lt;h4&gt;&lt;a name=&quot;Summary&quot;&gt;&lt;/a&gt;Summary&lt;/h4&gt;

&lt;p&gt;A customer can opt-in to pausing balancing in a sharded cluster when updateMany operations are received by the database to ensure that the updateMany operations are successfully executed and all of the applicable documents are updated in a consistent manner.&#160;&#160;&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Motivation&quot;&gt;&lt;/a&gt;Motivation&lt;/h4&gt;

&lt;p&gt;Today when a client application sends an updateMany operation to a sharded cluster it is not serialized with chunk migrations so there&apos;s a possibility that the updateMany operation will target documents in a migrating chunk which can lead to an inconsistent updates. The updateMany operation on a document with the balancer active could potentially happen 0, 1, 2 or more times. This inconsistent behavior is not returned or exposed to the client application so the application believes that the updateMany operation successfully occurred and ultimately leads to a loss of data integrity. Additionally by pausing the balancer an updateMany query does not require the shard key in the case where &lt;tt&gt;upsert:true&lt;/tt&gt;&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;https://docs.google.com/document/d/1rXsiXdTvEPcdh8Jxq5Cjr2_vs7cGJjp1paOBDW2zFxo/edit&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Product Description&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://docs.google.com/document/d/198jv7ftPUL96XrZfd8Oh_cvyd5Nz_9E939nHq60icnM/edit#heading=h.b1os3ai9s8t3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Scope&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://docs.google.com/document/d/1kdQHKhjrc2P8OrnH79MweKIyuRkP3ojxYJHvpHdknzQ/edit?usp=drivesdk&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Technical Design&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://docs.google.com/document/d/1nDbUOxbO-5_okc3woPVsC6sXCP_jO2U0uu8VGDSOFBY/edit?usp=drivesdk&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Docs Update&lt;/a&gt;&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;
</description>
                <environment></environment>
        <key id="2503610">COMPASS-7468</key>
            <summary>Investigate changes in PM-3209: Block balancing during updateMany</summary>
                <type id="10501" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Investigation</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="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Fri, 17 Nov 2023 19:48:13 +0000</created>
                <updated>Tue, 16 Jan 2024 22:42:46 +0000</updated>
                            <resolved>Wed, 29 Nov 2023 14:33:52 +0000</resolved>
                                                    <fixVersion>No version</fixVersion>
                                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="6015714" author="dbeng-pm-bot" created="Tue, 16 Jan 2024 22:42:46 +0000"  >&lt;p&gt;&lt;em&gt;Fix Version updated for upstream PM-3209:&lt;/em&gt; &lt;br/&gt;
8.0 Targeted&lt;/p&gt;</comment>
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