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    <title>MongoDB Jira</title>
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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-32756] Preparation work to enable selection of new index format.</title>
                <link>https://jira.mongodb.org/browse/SERVER-32756</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A new unique index format will be introduced. To allow selection of this new format while creating a unique index, add a gating variable in MongoDB via a global conditional. Identify the places in code that do unique index work with WiredTiger and stub that code to deal with new format. &lt;br/&gt;
No need to plumb it through to a public configurable option.&lt;/p&gt;

&lt;p&gt;Also add a new &lt;tt&gt;IndexDescriptor::IndexVersion&lt;/tt&gt; flag &lt;tt&gt;kV2Unique&lt;/tt&gt;, which will be set on index creation if the new index format is selected by enabling the gating variable.&lt;/p&gt;</description>
                <environment></environment>
        <key id="484257">SERVER-32756</key>
            <summary>Preparation work to enable selection of new index format.</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="13201">Fixed</resolution>
                                        <assignee username="neha.khatri">Neha Khatri</assignee>
                                    <reporter username="neha.khatri">Neha Khatri</reporter>
                        <labels>
                    </labels>
                <created>Thu, 18 Jan 2018 04:00:19 +0000</created>
                <updated>Mon, 30 Oct 2023 23:09:14 +0000</updated>
                            <resolved>Wed, 7 Feb 2018 03:01:26 +0000</resolved>
                                                    <fixVersion>3.7.1</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1797640" author="xgen-internal-githook" created="Wed, 7 Feb 2018 02:56:43 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;neha.khatr@mongodb.com&apos;, &apos;name&apos;: &apos;nehakhatri5&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32756&quot; title=&quot;Preparation work to enable selection of new index format.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32756&quot;&gt;&lt;del&gt;SERVER-32756&lt;/del&gt;&lt;/a&gt; Enable selection of V2 format unique index&lt;/p&gt;

&lt;p&gt;A new unique index format would get added in MongoDB4.0 to overcome the&lt;br/&gt;
anonmaly of duplicate keys in unique index on secondary instances. Enabled&lt;br/&gt;
selection of new V2 format unique index via a gating variable. The&lt;br/&gt;
IndexDescriptor::IndexVersion now has a new flag kV2Unique. The version in an&lt;br/&gt;
IndexDescriptor object can be either kV2 or kV2Unique. A version value kV2Unique&lt;br/&gt;
means a V2 format unique index would be created. In this commit all of the&lt;br/&gt;
V2 format unique index implemetation is a copy of V1(unique index) format. It&lt;br/&gt;
would change in future commits.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/43fbd6a4fbac7d1630a62b3b471c9eeb3222b7e5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/43fbd6a4fbac7d1630a62b3b471c9eeb3222b7e5&lt;/a&gt;&lt;/p&gt;</comment>
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