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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-6812] Investigate changes in PM-3338: Global Balancing with the Ability to Move Unsharded Collection</title>
                <link>https://jira.mongodb.org/browse/COMPASS-6812</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;    This project will allow the balancer to automatically move unsharded collections so documentation must be updated to reflect the new functionality and this project will require shell helpers to improve the developer experience.&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;The balancer will have a new policy that will distribute all collections equally across the shards in a cluster by data size with ability to move an unsharded collection if necessary to another shard.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Motivation&quot;&gt;&lt;/a&gt;Motivation&lt;/h4&gt;

&lt;p&gt;Today only sharded collections are balanced across shards which can lead to a poor distribution of the data across the shards which leads to less than optimal resource utilization at a cluster level. Customers desire their workload to be as evenly distributed across the shards in their cluster as possible. To better distribute the workload across the cluster the balancer will take into account the size of both sharded and unsharded collection and will be able distribute unsharded and sharded collections as needed to achieve the goal of equal distribution of data across all shards. &lt;/p&gt;

&lt;p&gt;Additionally customers that would like gain the benefits of horizontal scalability without sharding all of their collections can now have the balancer distribute collections across a sharded collection automatically, greatly reducing the barrier to entry to receive value from a horizontally scaled cluster.&#160;&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;%C2%A0&quot;&gt;&lt;/a&gt;&#160;&lt;/h4&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/1WCk2hgTcSRUML-bPFwkC9HtJiSEO0P50ozkHGc8lDh8/edit?usp=drivesdk&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/1YvkZvJhfRLlhhWeuA8BgAbDsOK4hwPcCS3Mf19zseJY/edit?usp=drivesdk&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/130KrfC9HG41u6O2booXptFK6BnbHJjxWQoeT11vzYek/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/1elgbok73VpRbuQxvF2UvPoasdXj0LyExEtpeUMiQKEE/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="2337012">COMPASS-6812</key>
            <summary>Investigate changes in PM-3338: Global Balancing with the Ability to Move Unsharded Collection</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>Wed, 10 May 2023 14:26:55 +0000</created>
                <updated>Tue, 6 Feb 2024 14:13:34 +0000</updated>
                            <resolved>Fri, 19 Jan 2024 13:58:09 +0000</resolved>
                                                    <fixVersion>No version</fixVersion>
                                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="6071285" author="dbeng-pm-bot" created="Tue, 6 Feb 2024 14:13:34 +0000"  >&lt;p&gt;&lt;em&gt;Fix Version updated for upstream PM-3338:&lt;/em&gt; &lt;br/&gt;
8.1 Targeted&lt;/p&gt;</comment>
                            <comment id="6025523" author="JIRAUSER1256529" created="Fri, 19 Jan 2024 13:58:09 +0000"  >&lt;p&gt;We will include a goal in our 8.0 support scope to add a shell helper for the newly introduced balancer command.&lt;/p&gt;</comment>
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