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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-27455] Allow multiple &apos;draining&apos; shards</title>
                <link>https://jira.mongodb.org/browse/SERVER-27455</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;tt&gt;removeShard&lt;/tt&gt; command contains an &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.4.0/src/mongo/s/catalog/sharding_catalog_client_impl.cpp#L535&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;explicit check&lt;/a&gt; that there aren&apos;t any other shards that are currently draining and if so, fails the command. This check precludes the scenario of quickly shrinking a cluster, which might have been exponentially grown during peak time.&lt;/p&gt;

&lt;p&gt;The check is unnecessary, given that we already &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.4.0/src/mongo/db/s/balancer/balancer_policy_test.cpp#L300&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;test&lt;/a&gt; that the balancer supports this scenario and should be removed.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;NOTE:&lt;/b&gt; Fixing it in the 3.4 release will take advantage of the support for parallel migrations so multiple shards can drain in parallel. In versions 3.2 and older, the balancer only moves a single chunk at a time so having multiple &quot;draining&quot; shards only prevents chunks from jumping from one &quot;doomed&quot; shard to the next.&lt;/p&gt;</description>
                <environment></environment>
        <key id="339775">SERVER-27455</key>
            <summary>Allow multiple &apos;draining&apos; shards</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Mon, 19 Dec 2016 14:19:39 +0000</created>
                <updated>Sat, 26 Aug 2023 00:40:39 +0000</updated>
                            <resolved>Mon, 19 Dec 2016 15:28:07 +0000</resolved>
                                    <version>3.2.11</version>
                    <version>3.4.0</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1461067" author="spencer" created="Mon, 19 Dec 2016 15:28:07 +0000"  >&lt;p&gt;Dupe of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-11328&quot; title=&quot;Allow concurrent draining shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-11328&quot;&gt;&lt;del&gt;SERVER-11328&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
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