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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <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>[SERVER-64822] Sharding an empty collection releases the critical section too early</title>
                <link>https://jira.mongodb.org/browse/SERVER-64822</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When we shard an empty collection we can take a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9e623f1993911635f64e6b4afd8bdd11f7390ade/src/mongo/db/s/create_collection_coordinator.cpp#L566&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;shortcut&lt;/a&gt; and create chunks on shards different from the DB primary. This needs to happen under the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9e623f1993911635f64e6b4afd8bdd11f7390ade/src/mongo/db/s/create_collection_coordinator.cpp#L572&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;critical section&lt;/a&gt; so that we don&apos;t accept writes to the empty collection, before we have actually told the DB primary to no longer accept unsharded writes.&lt;/p&gt;

&lt;p&gt;The bug that we have is that we release the critical section after we have made the newly sharded collection visible, but before we set the shard version on the DB primary for that collection.&lt;/p&gt;

&lt;p&gt;This means that there is a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9e623f1993911635f64e6b4afd8bdd11f7390ade/src/mongo/db/s/create_collection_coordinator.cpp#L598-L607&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;brief window&lt;/a&gt; during which writes for an empty collection that was just sharded could be accepted.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2007167">SERVER-64822</key>
            <summary>Sharding an empty collection releases the critical section too early</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="13201">Fixed</resolution>
                                        <assignee username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Wed, 23 Mar 2022 13:56:20 +0000</created>
                <updated>Sun, 29 Oct 2023 21:40:41 +0000</updated>
                            <resolved>Thu, 7 Apr 2022 10:18:54 +0000</resolved>
                                    <version>5.0.5</version>
                    <version>5.1.1</version>
                    <version>5.2.1</version>
                    <version>5.3.0-rc4</version>
                                    <fixVersion>6.0.0-rc0</fixVersion>
                    <fixVersion>5.0.9</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="4501982" author="xgen-internal-githook" created="Sun, 24 Apr 2022 06:28:23 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kaloian Manassiev&apos;, &apos;email&apos;: &apos;kaloian.manassiev@mongodb.com&apos;, &apos;username&apos;: &apos;kaloianm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64822&quot; title=&quot;Sharding an empty collection releases the critical section too early&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64822&quot;&gt;&lt;del&gt;SERVER-64822&lt;/del&gt;&lt;/a&gt; Clear filtering metadata if createCollection commit fails&lt;/p&gt;

&lt;p&gt;(cherry picked from commit c257704b483fb3938465f5eb4f2a01e1d1e7c119)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f03ce604556625b9b64d04ceca8f18d28b67733a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f03ce604556625b9b64d04ceca8f18d28b67733a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4463538" author="xgen-internal-githook" created="Thu, 7 Apr 2022 08:03:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kaloian Manassiev&apos;, &apos;email&apos;: &apos;kaloian.manassiev@mongodb.com&apos;, &apos;username&apos;: &apos;kaloianm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64822&quot; title=&quot;Sharding an empty collection releases the critical section too early&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64822&quot;&gt;&lt;del&gt;SERVER-64822&lt;/del&gt;&lt;/a&gt; Clear filtering metadata if createCollection commit fails&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c257704b483fb3938465f5eb4f2a01e1d1e7c119&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c257704b483fb3938465f5eb4f2a01e1d1e7c119&lt;/a&gt;&lt;/p&gt;</comment>
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