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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-85975] Clear database state when dropping last collection</title>
                <link>https://jira.mongodb.org/browse/SERVER-85975</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&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;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;&amp;gt; db.getSiblingDB(&apos;mydb&apos;).createCollection(&apos;foo&apos;)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;&amp;gt; db.getSiblingDB(&apos;mydb&apos;).foo.drop()&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;&amp;gt; db.getSiblingDB(&apos;Mydb&apos;).createCollection(&apos;foo&apos;)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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-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;MongoServerError: db already exists with different case already have: [mydb] trying to create [Mydb]&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;^^ The above happens even in replica sets (i.e., unsharded clusters). Happens in the last 4.2 version as well as 7.0.5.&lt;/p&gt;

&lt;p&gt;Per &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=matt.kneiser%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;matt.kneiser@mongodb.com&quot;&gt;matt.kneiser@mongodb.com&lt;/a&gt;, it looks like the reason is:&lt;/p&gt;
&lt;blockquote&gt;&lt;p&gt;It looks like the DatabaseHolderImpl/DBsIndex, requires an explicit dropDb() call to unregister the namespace. Otherwise, we keep state around in memory that a database with &quot;mydb&quot; exists.&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;(&lt;a href=&quot;https://mongodb.slack.com/archives/C2RCHGB2L/p1706641672533519&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Slack thread&lt;/a&gt;)&lt;/p&gt;

&lt;p&gt;Ideas:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;The last collection drop should probably clear out the DB state.&lt;/li&gt;
	&lt;li&gt;Should that mean we get an oplog dropDatabase entry (and change event), too?&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Additional context: Mongosync can&#8217;t do `dropDatabase` commands&#8212;even in response to events of that name&#8212;because there&#8217;s no UUID.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2561529">SERVER-85975</key>
            <summary>Clear database state when dropping last collection</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="henrik.edin@mongodb.com">Henrik Edin</assignee>
                                    <reporter username="felipe.gasper@mongodb.com">Felipe Gasper</reporter>
                        <labels>
                            <label>time-series-mongosync</label>
                    </labels>
                <created>Tue, 30 Jan 2024 19:36:09 +0000</created>
                <updated>Tue, 6 Feb 2024 16:53:19 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>6</watches>
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                                        <issuelink>
            <issuekey id="966052">SERVER-43925</issuekey>
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            <issuekey id="2319688">SERVER-76342</issuekey>
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