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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-43857] Only use a MODE_IX collection lock for index creation on an empty collection</title>
                <link>https://jira.mongodb.org/browse/SERVER-43857</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;ul&gt;
	&lt;li&gt;Register new indexes with the &lt;tt&gt;IndexCatalog&lt;/tt&gt; after getting the commit &lt;tt&gt;OpTime&lt;/tt&gt; in the &lt;tt&gt;OpObserver&lt;/tt&gt;. Set the &lt;tt&gt;minVisibleSnapshot&lt;/tt&gt; to the commit time before registering.&lt;/li&gt;
	&lt;li&gt;As it is now possible for concurrent creations of the same collection name to race, throw a &lt;tt&gt;WriteConflictException&lt;/tt&gt; if registration fails due to an already existing collection of the same name. Test that conflicts that happen before registration time still return &lt;tt&gt;IndexKeySpecsConflict&lt;/tt&gt;.&lt;/li&gt;
	&lt;li&gt;Ensure that operations that do not read at a timestamp cannot see an index that has been observed by the &lt;tt&gt;OpObserver&lt;/tt&gt; but that not yet has committed, or has been committed in a newer storage snapshot than that of the reader.&lt;/li&gt;
	&lt;li&gt;Ensure that the above mechanism also works for non-replicated collections, or keep using &lt;tt&gt;MODE_X&lt;/tt&gt; collection locks for those.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="962276">SERVER-43857</key>
            <summary>Only use a MODE_IX collection lock for index creation on an empty collection</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="geert.bosch@mongodb.com">Geert Bosch</assignee>
                                    <reporter username="geert.bosch@mongodb.com">Geert Bosch</reporter>
                        <labels>
                    </labels>
                <created>Mon, 7 Oct 2019 00:57:20 +0000</created>
                <updated>Tue, 15 Oct 2019 21:06:20 +0000</updated>
                            <resolved>Tue, 15 Oct 2019 21:06:01 +0000</resolved>
                                                                    <component>Catalog</component>
                    <component>Index Maintenance</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2483790" author="geert.bosch" created="Tue, 15 Oct 2019 21:06:01 +0000"  >&lt;p&gt;Checking whether a collection is empty or not is meaningless without locking. The real intent is support for creating indexes on newly created collections, so opening a ticket for that instead.&lt;/p&gt;</comment>
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