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    <title>MongoDB Jira</title>
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    <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-58018] Creating a collection on standalone node that was part of a replica set may lead to fassert</title>
                <link>https://jira.mongodb.org/browse/SERVER-58018</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If the following sequence of events occurs:&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;Node &lt;tt&gt;n&lt;/tt&gt; in replica set is restarted as standalone&lt;/li&gt;
	&lt;li&gt;User creates a replicated collection on &lt;tt&gt;n&lt;/tt&gt;&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;n&lt;/tt&gt; rejoins the replica set&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;In this case, the collection created on &lt;tt&gt;n&lt;/tt&gt; in standalone mode would have a different UUID compared to the rest of the replica set. As a result, any subsequent operations on that collection would lead to an &lt;tt&gt;fassert&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;To help alleviate this, one idea is require an explicit UUID when creating this new collection, if the node is currently in standalone mode but was previously part of a replica set. &lt;/p&gt;

&lt;p&gt;Alternatively, we can add warning logs when the node attempts to create replicated collections in standalone mode.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1795306">SERVER-58018</key>
            <summary>Creating a collection on standalone node that was part of a replica set may lead to fassert</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="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-repl">Backlog - Replication Team</assignee>
                                    <reporter username="xuerui.fa@mongodb.com">Xuerui Fa</reporter>
                        <labels>
                    </labels>
                <created>Wed, 23 Jun 2021 14:11:54 +0000</created>
                <updated>Tue, 6 Dec 2022 01:10:49 +0000</updated>
                            <resolved>Tue, 6 Jul 2021 18:23:49 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>6</watches>
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                            <customfieldvalue>If the following sequence of events occurs:&lt;br/&gt;
&lt;br/&gt;
1. Node n in replica set is restarted as standalone&lt;br/&gt;
2. User creates a replicated collection on n&lt;br/&gt;
3. n rejoins the replica set&lt;br/&gt;
&lt;br/&gt;
In this case, the collection created on n in standalone mode would have a different UUID compared to the rest of the replica set. As a result, any subsequent operations on that collection would lead to an fassert.&lt;br/&gt;
&lt;br/&gt;
Should we update the docs around creating a replicated collection in standalone mode to inform users of this potential issue? This may help inform users about having collections with mismatched UUIDs. Thank you!</customfieldvalue>

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