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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-38702] Set up FCV for simultaneous index builds</title>
                <link>https://jira.mongodb.org/browse/SERVER-38702</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;FCV 4.0 should perform v4.0 single-phase index builds. FCV 4.2 should execute two-phase index builds across a replica set.&lt;/p&gt;

&lt;p&gt;This ticket should be done after:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;the new index catalog entry fields and config.system.indexBuilds documents are fully functional &amp;#8211; need the persisted flag whether the index build began in FCV 4.0 or 4.2 to be safely persisted and in-memory.&lt;/li&gt;
	&lt;li&gt;simultaneous index builds work&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;createIndexes oplog entries via applyOps should be protected against?&lt;/p&gt;

&lt;p&gt;Index builds that begin in FCV 4.0, in order to parallel v4.0 index builds, should be aborted on primary stepdown and should not be recovered on start up if begun on a primary. &lt;/p&gt;

&lt;p&gt;Furthermore, consider whether any special handling of the behavior in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39003&quot; title=&quot;Index build constraint violations and interceptor side table must not be dropped on server restart&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39003&quot;&gt;&lt;del&gt;SERVER-39003&lt;/del&gt;&lt;/a&gt; is needed: it adds functionality not to drop the index build temp table on server restart. FCV 4.0 builds recovered on startup may need to deliberately drop those before discarding.&lt;/p&gt;

&lt;p&gt;Lastly, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38910&quot; title=&quot;Remove redundant rollback handling on index drops&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38910&quot;&gt;&lt;del&gt;SERVER-38910&lt;/del&gt;&lt;/a&gt; discovered that logic to rebuild one-phase dropped indexes cannot be removed because upgrade from v4.0 for v4.2 must be supported.&lt;/p&gt;</description>
                <environment></environment>
        <key id="657949">SERVER-38702</key>
            <summary>Set up FCV for simultaneous index builds</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                    </labels>
                <created>Wed, 19 Dec 2018 15:00:56 +0000</created>
                <updated>Tue, 6 Dec 2022 03:10:09 +0000</updated>
                            <resolved>Mon, 23 Sep 2019 15:30:48 +0000</resolved>
                                                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="2428251" author="benety.goh" created="Mon, 23 Sep 2019 15:30:48 +0000"  >&lt;p&gt;FCV constants are available in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41230&quot; title=&quot;Update FCV constants throughout server code following 4.2 branch&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41230&quot;&gt;&lt;del&gt;SERVER-41230&lt;/del&gt;&lt;/a&gt; for index builds. We will incorporate FCV checks in individual work tickets.&lt;/p&gt;</comment>
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            <issuekey id="629882">SERVER-37966</issuekey>
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