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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-64542] shardCollection no-op oplog can be written even when command ultimately fails</title>
                <link>https://jira.mongodb.org/browse/SERVER-64542</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, we write the oplog right before we send the final update that commits the migration to the config server:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/077b55e6330264b262d87d296a7f7006fece669e/src/mongo/db/s/create_collection_coordinator.cpp#L920&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/077b55e6330264b262d87d296a7f7006fece669e/src/mongo/db/s/create_collection_coordinator.cpp#L920&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;However, if the server restarts right before the final update it sent, then it is possible for dropIndex to sneak in and drop the necessary index required by the shard collection. When the CreateCoordinator gets restored and tries to redo, it will find out that the collection doesn&apos;t have the required index for the shard key pattern and fail.&lt;/p&gt;

&lt;p&gt;Some context for why oplog was written before the final update: it was done to achieve the property where the oplog will have ts &amp;lt; any writes that come after the collection became sharded.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2002493">SERVER-64542</key>
            <summary>shardCollection no-op oplog can be written even when command ultimately fails</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="13201">Fixed</resolution>
                                        <assignee username="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                    </labels>
                <created>Tue, 15 Mar 2022 21:04:33 +0000</created>
                <updated>Sun, 29 Oct 2023 21:41:03 +0000</updated>
                            <resolved>Fri, 18 Mar 2022 19:16:19 +0000</resolved>
                                                    <fixVersion>6.0.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4421515" author="xgen-internal-githook" created="Fri, 18 Mar 2022 19:10:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Randolph Tan&apos;, &apos;email&apos;: &apos;randolph@10gen.com&apos;, &apos;username&apos;: &apos;renctan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64542&quot; title=&quot;shardCollection no-op oplog can be written even when command ultimately fails&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64542&quot;&gt;&lt;del&gt;SERVER-64542&lt;/del&gt;&lt;/a&gt; shardCollection no-op oplog can be written even when command ultimately fails&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/25ddbc88cabaf0d14896c40526dc1b7a3077aebe&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/25ddbc88cabaf0d14896c40526dc1b7a3077aebe&lt;/a&gt;&lt;/p&gt;</comment>
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                                                                <inwardlinks description="is related to">
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            <issuekey id="1942187">SERVER-61887</issuekey>
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            <issuelink>
            <issuekey id="44572">SERVER-6491</issuekey>
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