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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-85390] Index build can be missing on secondary after stepdown</title>
                <link>https://jira.mongodb.org/browse/SERVER-85390</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When oplogApplicationEnforcesSteadyStateConstraints is set to false, if there is an index build conflict after a node steps down and the existing index build fails, the index build is not retried resulting in an index build missing on a secondary.&lt;/p&gt;

&lt;p&gt;This is the order events that can cause this:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Node 1 starts index build A as a primary and the index build is scheduled (making it past &lt;a href=&quot;https://github.com/10gen/mongo/blob/a726af52f43109eefaef3d61413d031b04316220/src/mongo/db/index_builds_coordinator_mongod.cpp#L487-L492&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this check&lt;/a&gt;)&lt;/li&gt;
	&lt;li&gt;Node 1 steps down&lt;/li&gt;
	&lt;li&gt;Node 2 steps up as primary and starts index build B with the same name as index build A&lt;/li&gt;
	&lt;li&gt;Node 1 tries to replicate index build B but runs into an &lt;a href=&quot;https://github.com/10gen/mongo/blob/a726af52f43109eefaef3d61413d031b04316220/src/mongo/db/repl_index_build_state.cpp#L661-L662&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;index build conflict&lt;/a&gt; with index build A but continues with &lt;a href=&quot;https://github.com/10gen/mongo/blob/4946f9aaa808fc341e7e3666de0c4808c5c3b019/src/mongo/db/repl/oplog.cpp#L2461-L2472&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this error&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;Index build A on node 1 fails&lt;/li&gt;
	&lt;li&gt;Index build B now missing on node 1 and is not retried&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;In production, this could only be detected by running dbcheck when the db hashes for Node 1 and Node 2 mismatch.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2550226">SERVER-85390</key>
            <summary>Index build can be missing on secondary after stepdown</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</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="shinyee.tan@mongodb.com">Shin Yee Tan</reporter>
                        <labels>
                            <label>storex-shortlist</label>
                    </labels>
                <created>Thu, 18 Jan 2024 17:09:24 +0000</created>
                <updated>Mon, 29 Jan 2024 19:03:49 +0000</updated>
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