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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-70162] moveChunk and shardCollection commands are not properly synchronized</title>
                <link>https://jira.mongodb.org/browse/SERVER-70162</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The current implementation of the &lt;tt&gt;shardCollection&lt;/tt&gt; command enters the critical section, &lt;a href=&quot;https://github.com/10gen/mongo/blob/3fd762cca4850d1159603eadd27b1f826ee3ca07/src/mongo/db/s/create_collection_coordinator.cpp##L518&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;creates the configuration entry&lt;/a&gt; to the config server, then &lt;a href=&quot;https://github.com/10gen/mongo/blob/3fd762cca4850d1159603eadd27b1f826ee3ca07/src/mongo/db/s/create_collection_coordinator.cpp#L524&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;leaves the critical section&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Between the collections creation and release of the critical section events, the newly created collection could be taken into account by the balancer (&lt;tt&gt;moveChunk&lt;/tt&gt; command) which &lt;a href=&quot;https://github.com/10gen/mongo/blob/3fd762cca4850d1159603eadd27b1f826ee3ca07/src/mongo/db/s/migration_source_manager.cpp#L365-L366&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;would not be able to enter the critical section&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;A possible solution consists in creating the collection entry with the &lt;tt&gt;allowMigrations&lt;/tt&gt; flag set, then unset it with the &lt;tt&gt;_configsvrSetAllowMigrations&lt;/tt&gt; once the critical section is left. Note this flag must be unset in a phase of the &lt;tt&gt;shardCollection&lt;/tt&gt; that is resilient to stepdown/shutdown.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2150063">SERVER-70162</key>
            <summary>moveChunk and shardCollection commands are not properly synchronized</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-server-sharding-emea">[DO NOT USE] Backlog - Sharding EMEA</assignee>
                                    <reporter username="antonio.fuschetto@mongodb.com">Antonio Fuschetto</reporter>
                        <labels>
                    </labels>
                <created>Mon, 3 Oct 2022 14:09:57 +0000</created>
                <updated>Mon, 5 Dec 2022 23:40:22 +0000</updated>
                            <resolved>Tue, 4 Oct 2022 08:20:26 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4875576" author="JIRAUSER1259062" created="Tue, 4 Oct 2022 08:20:26 +0000"  >&lt;p&gt;The &lt;tt&gt;moveChunk&lt;/tt&gt; is &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c795402c9b2bb23ea5887ae2e92b030e4953472c/src/mongo/db/s/migration_source_manager.cpp#L165&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;serialized with the critical section&lt;/a&gt;, so there is no race with the &lt;tt&gt;shardCollection&lt;/tt&gt;.&lt;/p&gt;</comment>
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