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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-75059] Explore improvements on index build concurrent state handling</title>
                <link>https://jira.mongodb.org/browse/SERVER-75059</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The way index build state is handled is very racy.&lt;/p&gt;

&lt;p&gt;The way active index builds are managed. Active index builds are registered before the &apos;startIndexBuild&apos; oplog entry is replicated, which leaves open the possibility of a node stepping down, and encountering oplog entry for a DDL operation which assumes no index builds are in-progress (e.g. a collection drop) while the index build is still registered.&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74953&quot; title=&quot;Explore avoiding stepdowns during the early phases of index build setup&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74953&quot;&gt;&lt;del&gt;SERVER-74953&lt;/del&gt;&lt;/a&gt; tries to mitigate the issue by making the builder thread interruptible until the oplog entry is replicated, but it won&apos;t make the problem disappear.&lt;/p&gt;

&lt;p&gt;The reverse is also true, a committed index build de-registered and cleaned-up can race with step-up checks. And the way index builds are de-registered is all over the place. A search for &quot;activeIndexBuilds.unregisterIndexBuild&quot; turns up 10+ instances.&lt;/p&gt;

&lt;p&gt;...&lt;/p&gt;</description>
                <environment></environment>
        <key id="2292759">SERVER-75059</key>
            <summary>Explore improvements on index build concurrent state handling</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="yujin.kang@mongodb.com">Yujin Kang Park</reporter>
                        <labels>
                            <label>techdebt</label>
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                <created>Mon, 20 Mar 2023 17:40:25 +0000</created>
                <updated>Wed, 24 May 2023 13:26:55 +0000</updated>
                                                                                                <votes>1</votes>
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