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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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    <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-43859] Use only MODE_IX locks for creating a new collection, and new db if needed</title>
                <link>https://jira.mongodb.org/browse/SERVER-43859</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="962298">SERVER-43859</key>
            <summary>Use only MODE_IX locks for creating a new collection, and new db if needed</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="daniel.gottlieb@mongodb.com">Daniel Gottlieb</assignee>
                                    <reporter username="geert.bosch@mongodb.com">Geert Bosch</reporter>
                        <labels>
                    </labels>
                <created>Mon, 7 Oct 2019 01:21:31 +0000</created>
                <updated>Sun, 29 Oct 2023 22:16:23 +0000</updated>
                            <resolved>Tue, 26 Nov 2019 04:53:49 +0000</resolved>
                                                    <fixVersion>4.3.3</fixVersion>
                                    <component>Catalog</component>
                    <component>Concurrency</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2565746" author="xgen-internal-githook" created="Tue, 26 Nov 2019 04:49:02 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Daniel Gottlieb&apos;, &apos;username&apos;: &apos;dgottlieb&apos;, &apos;email&apos;: &apos;daniel.gottlieb@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43859&quot; title=&quot;Use only MODE_IX locks for creating a new collection, and new db if needed&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43859&quot;&gt;&lt;del&gt;SERVER-43859&lt;/del&gt;&lt;/a&gt;: Take MODE_IX locks for collection creation.&lt;/p&gt;

&lt;p&gt;Two concurrent storage transactions can now create collections with the same&lt;br/&gt;
collection name. These transactions will conflict at commit time; the first&lt;br/&gt;
committer will win and register their collection into the global catalog. The&lt;br/&gt;
losing transactions will bubble a WriteConflictException.&lt;/p&gt;

&lt;p&gt;Top-level callers that should fail if the collection already existed must now&lt;br/&gt;
check and fail with a NamespaceExists error code. Previously, those callers&lt;br/&gt;
could rely on lower level code returning the NamespaceExists error.&lt;/p&gt;

&lt;p&gt;Callers that were implicitly creating a collection may retry the operation,&lt;br/&gt;
using the now-registered collection.&lt;/p&gt;

&lt;p&gt;These transaction-local collections (UncommittedCollections) are returned when&lt;br/&gt;
doing any CollectionCatalog::lookup* call.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d471957fc37ef6cafe9ffeda3e231cdc871c3ce3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d471957fc37ef6cafe9ffeda3e231cdc871c3ce3&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="980936">SERVER-44276</issuekey>
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