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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-80532] Sharding catalog may be missing databases created during addShard</title>
                <link>https://jira.mongodb.org/browse/SERVER-80532</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The current implementation of addShard discovers/registers databases in the following way:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/806f6d42ee6c2d0a8c1cc7079fb589301961124e/src/mongo/db/s/config/sharding_catalog_manager_shard_operations.cpp#L635-L642&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;listDatabases is invoked on the shard being added&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;a document is added to &lt;tt&gt;config.databases&lt;/tt&gt; &lt;a href=&quot;https://github.com/mongodb/mongo/blob/806f6d42ee6c2d0a8c1cc7079fb589301961124e/src/mongo/db/s/config/sharding_catalog_manager_shard_operations.cpp#L653-L660&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;for each result returned by (1)&lt;/a&gt;&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;If any database is created on the new shard between (1) and (2), the config server will not get to know that it exists. This is totally possible because during &lt;tt&gt;addShard&lt;/tt&gt; users are allowed to use direct connections to the new shard. The same bug can be hit also when users keep on using direct connections instead of switching to the router after &lt;tt&gt;addShard&lt;/tt&gt; returns.&lt;/p&gt;

&lt;p&gt;This can lead to data loss since the first time a router tries to access the version of a non-tracked db it contacts the config server that can potentially register it on another shard.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2429574">SERVER-80532</key>
            <summary>Sharding catalog may be missing databases created during addShard</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="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="backlog-server-catalog-and-routing">Backlog - Catalog and Routing</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                            <label>oldshardingemea</label>
                    </labels>
                <created>Tue, 29 Aug 2023 22:10:39 +0000</created>
                <updated>Mon, 30 Oct 2023 08:50:40 +0000</updated>
                                            <version>4.4.25</version>
                    <version>7.2.0-rc0</version>
                    <version>7.0.2</version>
                    <version>5.0.22</version>
                    <version>6.0.11</version>
                    <version>7.1.0</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
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