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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-55284] Get rid of the ScopedAllowImplicitCollectionCreate_UNSAFE marker</title>
                <link>https://jira.mongodb.org/browse/SERVER-55284</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-52778&quot; title=&quot;Add markers for all places where collections are implicitly created on a Shard&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-52778&quot;&gt;&lt;del&gt;SERVER-52778&lt;/del&gt;&lt;/a&gt; we added the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f639926bfe98418c868076ba2c1bcd1ad5b080d8/src/mongo/db/s/operation_sharding_state.h#L79&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;ScopedAllowImplicitCollectionCreate_UNSAFE&lt;/tt&gt;&lt;/a&gt; marker RAII class, which allows only a fixed set of code paths to create collections in a Sharded cluster.&lt;/p&gt;

&lt;p&gt;This ticket is the last part of a set of dependent tickets to remove it from the various implicit collection creation paths. When this ticket is ready to be worked on, we should just rename that utility to something more meaningful and only use it in the &lt;tt&gt;CreateCollection&lt;/tt&gt; coordinator.&lt;/p&gt;

&lt;p&gt;Without this ticket, implicitly created collections (through write to a non-existent collection for example) and those created through a call to &lt;tt&gt;create&lt;/tt&gt; will not serialise with DropDatabase and could end-up getting lost.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1652381">SERVER-55284</key>
            <summary>Get rid of the ScopedAllowImplicitCollectionCreate_UNSAFE marker</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Thu, 18 Mar 2021 07:19:41 +0000</created>
                <updated>Mon, 20 Sep 2021 19:33:50 +0000</updated>
                            <resolved>Mon, 20 Sep 2021 15:22:48 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="4071621" author="kaloian.manassiev" created="Mon, 20 Sep 2021 15:22:48 +0000"  >&lt;p&gt;The &lt;tt&gt;ScopedAllowImplicitCollectionCreate_UNSAFE&lt;/tt&gt; marker was added as a means to catch all places, which create collection outside of the sharded create collection protocol. Such places are inherently unsafe to exist, because they do not synchronise with a concurrent sharded DDL, most notably dropDatabase.&lt;/p&gt;

&lt;p&gt;While we have solved the &lt;tt&gt;dropDatabase&lt;/tt&gt; synchronisation through the use of the database critical section, the markers should remain in place for when we start registering all collections in the sharded catalog.&lt;/p&gt;

&lt;p&gt;Closing as Won&apos;t Do.&lt;/p&gt;</comment>
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            <issuekey id="1878903">SERVER-60092</issuekey>
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