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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>[DOCS-16030] Investigate changes in SERVER-75942: Check that database name is valid UTF-8 when creating a new database </title>
                <link>https://jira.mongodb.org/browse/DOCS-16030</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Original Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;    This ticket has some interesting upgrade and migration (mongosync et al.) considerations. A user that somehow ends up with one of these bad UTF-8 database names will need to remove or rename them before upgrading.&lt;/p&gt;

&lt;p&gt;I am marking documentation changes as &quot;Needed&quot; as, if we make this change, we should update this page on MongoDB database name restrictions: &lt;a href=&quot;https://www.mongodb.com/docs/manual/reference/limits/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://www.mongodb.com/docs/manual/reference/limits/&lt;/a&gt;&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    When running the attached &lt;span class=&quot;error&quot;&gt;&amp;#91;^bad_dbname.cpp&amp;#93;&lt;/span&gt;script with mongod, we allow the database name to have an invalid utf-8 character (eg. &quot;name\xbc&quot;). &lt;/p&gt;

&lt;p&gt;When running with mongos, the sharding catalog manager checks if the dbName already exists. It also does a case insensitive match by filtering on the regex (&lt;a href=&quot;https://github.com/10gen/mongo/blob/master/src/mongo/db/s/config/sharding_catalog_manager_database_operations.cpp/#L176-L180&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/blob/master/src/mongo/db/s/config/sharding_catalog_manager_database_operations.cpp/#L176-L180&lt;/a&gt;). In doing so, the regex fails with invalid utf-8 (&lt;a href=&quot;https://github.com/10gen/mongo/blob/master/src/mongo/db/matcher/expression_leaf.cpp/#L245-L247&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/blob/master/src/mongo/db/matcher/expression_leaf.cpp/#L245-L247&lt;/a&gt;).&lt;/p&gt;

&lt;p&gt;We should not allow creating a database with an invalid utf-8 in any of the cases.&lt;/p&gt;

&lt;p&gt;This was motivated by investigating &#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57026&quot; title=&quot;Regular expression is invalid UTF-8 while enabling mongo backwards-incompatible 4.0 features&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57026&quot;&gt;&lt;del&gt;SERVER-57026&lt;/del&gt;&lt;/a&gt;&#160;and&#160;&lt;del&gt;HELP-43395.&lt;/del&gt; We should verify that after this change the invalid entries listed in the tickets cannot be created.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="2312175">DOCS-16030</key>
            <summary>Investigate changes in SERVER-75942: Check that database name is valid UTF-8 when creating a new database </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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                            <label>backlog</label>
                            <label>feature</label>
                            <label>sharding</label>
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                <created>Tue, 11 Apr 2023 21:30:03 +0000</created>
                <updated>Mon, 22 Jan 2024 15:48:01 +0000</updated>
                                                                            <component>manual</component>
                    <component>Server</component>
                        <due></due>
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                            <customfieldvalue>This ticket has some interesting upgrade and migration (mongosync et al.) considerations. A user that somehow ends up with one of these bad UTF-8 database names will need to remove or rename them before upgrading.&lt;br/&gt;
&lt;br/&gt;
I am marking documentation changes as &amp;quot;Needed&amp;quot; as, if we make this change, we should update this page on MongoDB database name restrictions: &lt;a href=&quot;https://www.mongodb.com/docs/manual/reference/limits/&quot;&gt;https://www.mongodb.com/docs/manual/reference/limits/&lt;/a&gt;</customfieldvalue>

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