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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-25763] addShard upserts discovered databases without locking, this could change a databases primary out from under it</title>
                <link>https://jira.mongodb.org/browse/SERVER-25763</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;During &lt;a href=&quot;https://github.com/mongodb/mongo/blob/8f0665f1f0cb98db7b2c31880208b576fe90a04f/src/mongo/s/catalog/replset/sharding_catalog_manager_impl.cpp#L804&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;addShard&lt;/a&gt; we find any databases that already exist on the shard being added and attempt to add them to the cluster.  Before we do that, we check that no databases that exist on the shard already exist on the cluster.  There is no locking during these checks, however, so it&apos;s possible that a database could be created after the check and assigned to a different shard.  If that happens, when we upsert the database document for the database discovered on the shard, we might wind up changing the &apos;primary&apos; shard for that database out from under it, leading to data loss.&lt;/p&gt;</description>
                <environment></environment>
        <key id="311336">SERVER-25763</key>
            <summary>addShard upserts discovered databases without locking, this could change a databases primary out from under it</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="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-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                            <label>PM-1017</label>
                    </labels>
                <created>Tue, 23 Aug 2016 20:28:55 +0000</created>
                <updated>Tue, 6 Dec 2022 04:18:20 +0000</updated>
                            <resolved>Thu, 19 Dec 2019 14:31:55 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
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                            <comment id="2649733" author="sheeri.cabral" created="Thu, 19 Dec 2019 14:31:55 +0000"  >&lt;p&gt;This is not pervasive enough for a fix.&lt;/p&gt;</comment>
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