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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-16116] Server should not start if datafiles from other storage engine are present in dbpath</title>
                <link>https://jira.mongodb.org/browse/SERVER-16116</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Say I start mongod with mmapv1 enabled in a clean directory:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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&lt;p/&gt;

&lt;p&gt;Then exit the server.&lt;/p&gt;

&lt;p&gt;then if I start the server with the same dbpath but with wiredtiger:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;mongod --dbpath=mongodata --storageEngine=wiredtiger&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;the server will happily start writing data files to the same directory mmapv1 was using. (Also happens if I do wiredtiger, than mmap)&lt;/p&gt;

&lt;p&gt;This is probably going to cause some confusion and/or misconfiguration at some point. I think it would be better if we detected that we are starting in a non-empty dbpath with incompatible data files and refuse to start.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="168887">SERVER-16116</key>
            <summary>Server should not start if datafiles from other storage engine are present in dbpath</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="adam.midvidy">Adam Midvidy</reporter>
                        <labels>
                    </labels>
                <created>Wed, 12 Nov 2014 22:13:17 +0000</created>
                <updated>Thu, 13 Nov 2014 18:50:08 +0000</updated>
                            <resolved>Wed, 12 Nov 2014 22:17:39 +0000</resolved>
                                    <version>2.8.0-rc0</version>
                                                    <component>Storage</component>
                    <component>Usability</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
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                            <issuelinktype id="10010">
                    <name>Duplicate</name>
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            <issuekey id="167654">SERVER-15986</issuekey>
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                            <issuelinktype id="10012">
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            <issuekey id="168533">SERVER-16082</issuekey>
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