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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-27470] shardCollection and movePrimary should not be allowed to run in parallel</title>
                <link>https://jira.mongodb.org/browse/SERVER-27470</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;on the same parent database.&lt;/p&gt;

&lt;p&gt;The last phase of the movePrimary command is to drop collections on the shard that were not sharded before the movePrimary command started. So if the collection becomes sharded half way through, the movePrimary command can accidentally drop the collection.&lt;/p&gt;</description>
                <environment></environment>
        <key id="339986">SERVER-27470</key>
            <summary>shardCollection and movePrimary should not be allowed to run in parallel</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="13203">Gone away</resolution>
                                        <assignee username="esha.maharishi@mongodb.com">Esha Maharishi</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                    </labels>
                <created>Tue, 20 Dec 2016 02:26:18 +0000</created>
                <updated>Fri, 27 Oct 2023 20:44:17 +0000</updated>
                            <resolved>Thu, 1 Mar 2018 16:24:14 +0000</resolved>
                                    <version>3.5.1</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1819908" author="esha.maharishi@10gen.com" created="Thu, 1 Mar 2018 16:24:03 +0000"  >&lt;p&gt;Closing because both &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.7.2/src/mongo/db/s/config/configsvr_shard_collection_command.cpp#L765-L767&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;shardCollection&lt;/a&gt; and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.7.2/src/mongo/db/s/config/configsvr_move_primary_command.cpp#L148-L149&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;movePrimary&lt;/a&gt; now take the database distlock, so they can no longer run concurrently.&lt;/p&gt;</comment>
                            <comment id="1473025" author="dianna.hohensee" created="Mon, 9 Jan 2017 21:33:23 +0000"  >&lt;p&gt;Since movePrimary and shardCollection can run simultaneously on different mongos servers, this would require taking distributed locks to fix. &lt;/p&gt;

&lt;p&gt;Moving this ticket into the epic to move metadata commands to the config server (PM-696). Rather than making a series of network calls to take the collection distributed locks for some undetermined number of collections, it&apos;s better to do it locally after the commands move to the config server.&lt;/p&gt;</comment>
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