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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>[COMPASS-6350] Investigate changes in PM-234: Resharding </title>
                <link>https://jira.mongodb.org/browse/COMPASS-6350</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;    We have completed Resharding work on Server. Flagging downstream teams as an FYI&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: #c2d2c2;border-color: #cccccc;border-style: dashed;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;border-bottom-style: dashed;border-bottom-color: #cccccc;background-color: #239eb0;&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;Introduce the ability to change the shard key of an existing sharded collection.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Motivation&quot;&gt;&lt;/a&gt;Motivation&lt;/h4&gt;

&lt;p&gt;Sharding enables workloads to achieve write scalability at the expense of additional latency by splitting up the data onto separate shards. Data access patterns within a user&apos;s application have varying levels of sensitivity to additional latency. The level of sensitivity influences the possible partitioning schemes and determines what additional latency for each data access pattern is acceptable. Moreover, the desired Serverless UX requires the Atlas team to be able to choose a shard key without prompting the user. Such an automated system can unknowingly make an undesirable trade-off for the user, or can learn later on that the application&#8217;s query shapes have changed. Thus, for such an automated system to be self-correcting, we would need the possibility to change the shard key of an existing sharded collection while having a minimal negative impact on the workload being run.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;CastofCharacters&quot;&gt;&lt;/a&gt;Cast of Characters&lt;/h4&gt;
&lt;ul&gt;
	&lt;li&gt;Product Owner: Garaudy Etienne&lt;/li&gt;
	&lt;li&gt;Project Lead: Max Hirschhorn&lt;/li&gt;
	&lt;li&gt;Program Manager: Ratika Gandhi&lt;/li&gt;
	&lt;li&gt;Drivers Contact:&lt;/li&gt;
&lt;/ul&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/1FEYuWnSsZS-ZkJXuala7g0FPKc6fs0GhNMWahyuonz0/edit?usp=sharing&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/1CI6lJ6Ha0jmQTLeWlMvp3CDY9DIhTcmJ3y7KcypDKWg&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;https://docs.google.com/document/d/1KPR5-08CRrlhJ9WtEjM7prmAsNazScKNsNR2MvhU180&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="2203207">COMPASS-6350</key>
            <summary>Investigate changes in PM-234: Resharding </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>
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                                    <resolution id="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
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                <created>Tue, 6 Dec 2022 07:13:58 +0000</created>
                <updated>Wed, 14 Dec 2022 14:21:14 +0000</updated>
                            <resolved>Wed, 14 Dec 2022 14:19:34 +0000</resolved>
                                                    <fixVersion>No version</fixVersion>
                                        <due></due>
                            <votes>0</votes>
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