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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>[DOCS-12952] Investigate changes in SERVER-11328: 4.4 only Allow concurrent draining shards</title>
                <link>https://jira.mongodb.org/browse/DOCS-12952</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;

    &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;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;    4.4 ONLY:::   Update the sharding documentation where it &lt;a href=&quot;https://docs.mongodb.com/manual/reference/command/removeShard/#behavior&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;says&lt;/a&gt; that only one shard can be in the removing state.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    Currently only one shard can be removed at a time. I trust that this was changed for a good reason but I feel a distinction should be made between actively draining a shard (which was problematic to do for more than one shard at the same time apparently) and tagging a shard as draining.&lt;/p&gt;

&lt;p&gt;The reason being is currently if we want to remove 5 shards for example and when the first of those 5 shards is draining it will potentially move its chunks to one of the other 4 shards that we want to remove anyway. This makes our cluster down scales unnecessarily slow since it&apos;s needlessly moving the same chunks around multiple times.&lt;/p&gt;

&lt;p&gt;The proposed solution is as follows :&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Allow marking multiple shards as &quot;draining&quot;&lt;/li&gt;
	&lt;li&gt;Balancer picks one of these draining shards as the one that is going to be drained completely&lt;/li&gt;
	&lt;li&gt;Balancer avoids moving chunks to shards that are marked as &quot;draining&quot;&lt;/li&gt;
&lt;/ul&gt;





&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="892298">DOCS-12952</key>
            <summary>Investigate changes in SERVER-11328: 4.4 only Allow concurrent draining shards</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Tue, 13 Aug 2019 08:58:11 +0000</created>
                <updated>Sun, 29 Oct 2023 13:56:04 +0000</updated>
                            <resolved>Tue, 17 Mar 2020 15:29:32 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                    <fixVersion>4.2.1</fixVersion>
                                        <due>Fri, 20 Mar 2020 00:00:00 +0000</due>
                            <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2983291" author="kay.kim@10gen.com" created="Tue, 17 Mar 2020 15:29:32 +0000"  >&lt;p&gt;For 4.4 only.  &lt;/p&gt;</comment>
                            <comment id="2983289" author="xgen-internal-githook" created="Tue, 17 Mar 2020 15:29:04 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;name&apos;: &apos;Kay Kim&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12952&quot; title=&quot;Investigate changes in SERVER-11328: 4.4 only Allow concurrent draining shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12952&quot;&gt;&lt;del&gt;DOCS-12952&lt;/del&gt;&lt;/a&gt;: concurrent draining shards&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/6dc5e77a3f7c1b6dfb72386a5a59f5baa98bf9ee&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/6dc5e77a3f7c1b6dfb72386a5a59f5baa98bf9ee&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2983282" author="kay.kim@10gen.com" created="Tue, 17 Mar 2020 15:26:37 +0000"  >&lt;p&gt;Great.  Thanks!&lt;/p&gt;</comment>
                            <comment id="2983265" author="melissa.plunkett" created="Tue, 17 Mar 2020 15:22:15 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kay.kim&quot; class=&quot;user-hover&quot; rel=&quot;kay.kim&quot;&gt;kay.kim&lt;/a&gt; my understanding is 4.4 only.   This will time nicely with it being exposed after cloud can support (which is in code review now).  Thank you!&lt;/p&gt;</comment>
                            <comment id="2581135" author="kay.kim@10gen.com" created="Wed, 4 Dec 2019 00:30:36 +0000"  >&lt;p&gt;Will put this blocked until ready to work on for 4.4&lt;/p&gt;</comment>
                            <comment id="2487446" author="melissa.plunkett" created="Thu, 17 Oct 2019 18:59:09 +0000"  >&lt;p&gt;FYI on timing - Automation will do in Q4, Atlas will likely add that in Q1 so we are looking at 4.4 for release and hence documenting this.&lt;/p&gt;</comment>
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