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    <title>MongoDB Jira</title>
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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-30559] Sharding tests which run under continuous stepdown must allow for lastVisibleOp to go backwards</title>
                <link>https://jira.mongodb.org/browse/SERVER-30559</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In view_rewrite.js, the test enables sharding on a database and then shards a collection.  Sharding a collection requires the database have sharding enabled.  However, this can fail under unusual circumstances when a stepdown occurs between enabling sharding on the database and sharding the collection; the write to the config server indicating that the database has sharding enabled may no longer be visible (though it is guaranteed to eventually become visible).&lt;/p&gt;</description>
                <environment></environment>
        <key id="413891">SERVER-30559</key>
            <summary>Sharding tests which run under continuous stepdown must allow for lastVisibleOp to go backwards</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="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="13203">Gone away</resolution>
                                        <assignee username="kevin.pulo@mongodb.com">Kevin Pulo</assignee>
                                    <reporter username="matthew.russotto@mongodb.com">Matthew Russotto</reporter>
                        <labels>
                            <label>sharding-4.4-stabilization</label>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Tue, 8 Aug 2017 15:46:29 +0000</created>
                <updated>Fri, 27 Oct 2023 20:43:57 +0000</updated>
                            <resolved>Thu, 26 Mar 2020 09:16:09 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3001778" author="kaloian.manassiev" created="Thu, 26 Mar 2020 08:56:32 +0000"  >&lt;p&gt;Thanks for the detailed write-up, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kevin.pulo&quot; class=&quot;user-hover&quot; rel=&quot;kevin.pulo&quot;&gt;kevin.pulo&lt;/a&gt;. Yes, the reasoning sounds right, because the &lt;tt&gt;local&lt;/tt&gt; read concern will permit the write to be seen even though it is not yet majority committed and any decision (i.e., subsequent write) made based on that read will be majority committed.&lt;/p&gt;

&lt;p&gt;This looks like it&apos;s gone away.&lt;/p&gt;</comment>
                            <comment id="3001744" author="kevin.pulo@10gen.com" created="Thu, 26 Mar 2020 08:06:08 +0000"  >&lt;p&gt;I&apos;m 99% sure this was fixed by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30615&quot; title=&quot;_configsvrShardCollection can retry upsert after getting writeConcern timeout and result in duplicate key error&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30615&quot;&gt;&lt;del&gt;SERVER-30615&lt;/del&gt;&lt;/a&gt; (and later further strengthened by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32375&quot; title=&quot;Config metadata commands should not use readConcern majority&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32375&quot;&gt;&lt;del&gt;SERVER-32375&lt;/del&gt;&lt;/a&gt;), which adjusted ShardLocal to do these local configsvr reads with readConcern level of local, rather than majority (as it was when this ticket was filed).  This means that the enableSharding op isn&apos;t hidden by reading from the slightly-old majority snapshot.  This was the approach taken at the time, rather than trying to do afterOpTime/afterClusterTime majority reads, to solve similar visibility problems when stepdowns occurred between sequential sharding operations.  This would also explain why there haven&apos;t been any recent recurrences of this problem, since &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30615&quot; title=&quot;_configsvrShardCollection can retry upsert after getting writeConcern timeout and result in duplicate key error&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30615&quot;&gt;&lt;del&gt;SERVER-30615&lt;/del&gt;&lt;/a&gt; was fixed about a month after this ticket was filed.&lt;/p&gt;</comment>
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