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    <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-45648] Make _configsvrCreateDatabase send _flushDatabaseCacheUpdates to primary shard even if database already existed in config.databases</title>
                <link>https://jira.mongodb.org/browse/SERVER-45648</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, if a config stepdown occurs after the database&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/169f13aff2b62483e9678409759528a2f9db58e7/src/mongo/db/s/config/sharding_catalog_manager_database_operations.cpp#L157&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;has been written to the sharding catalog&lt;/a&gt; but before the config &lt;a href=&quot;https://github.com/mongodb/mongo/blob/169f13aff2b62483e9678409759528a2f9db58e7/src/mongo/db/s/config/sharding_catalog_manager_database_operations.cpp#L177&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;sends _flushDatabaseCacheUpdates to the primary shard&lt;/a&gt;, a _configsvrCreateDatabase retry will see that the database already exists in the sharding catalog, and so returns early without running _flushDatabaseCacheUpdates.&lt;/p&gt;

&lt;p&gt;As a result, a database can be created even though the primary shard&apos;s filtering metadata for the database is &quot;unknown.&quot; This is not incorrect, but is not optimal as described &lt;a href=&quot;https://github.com/mongodb/mongo/blob/169f13aff2b62483e9678409759528a2f9db58e7/src/mongo/db/s/config/sharding_catalog_manager_database_operations.cpp#L160-L172&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Making _configsvrCreateDatabase send _flushDatabaseCacheUpdates even if the database already exists is not a perfect solution, since if the router does not retry (e.g., because the router crashed) or exhausts its retries (e.g., due to repeated network errors), this issue can still occur. However, this solution will at least prevent the BF from happening on Evergreen. A correct solution would require a larger design change to how the sharding catalog is kept in sync between the config server and shards.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1102762">SERVER-45648</key>
            <summary>Make _configsvrCreateDatabase send _flushDatabaseCacheUpdates to primary shard even if database already existed in config.databases</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="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="13201">Fixed</resolution>
                                        <assignee username="blake.oler@mongodb.com">Blake Oler</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                            <label>sharding-4.4-stabilization</label>
                            <label>sharding-csrs-stepdown-also</label>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Fri, 17 Jan 2020 20:47:08 +0000</created>
                <updated>Sun, 29 Oct 2023 22:13:07 +0000</updated>
                            <resolved>Thu, 12 Mar 2020 15:31:59 +0000</resolved>
                                                    <fixVersion>4.4.0-rc0</fixVersion>
                    <fixVersion>4.7.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="2978584" author="xgen-internal-githook" created="Fri, 13 Mar 2020 14:43:55 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Blake Oler&apos;, &apos;username&apos;: &apos;BlakeIsBlake&apos;, &apos;email&apos;: &apos;blake.oler@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45648&quot; title=&quot;Make _configsvrCreateDatabase send _flushDatabaseCacheUpdates to primary shard even if database already existed in config.databases&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45648&quot;&gt;&lt;del&gt;SERVER-45648&lt;/del&gt;&lt;/a&gt; Make _configsvrCreateDatabase send _flushDatabaseCacheUpdates to primary shard even if database already existed&lt;/p&gt;

&lt;p&gt;(cherry picked from commit db3a17bbfe2e265722ed88df961e79f3e1a68067)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d1b708e595e46846b76aa3172b36278848939700&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d1b708e595e46846b76aa3172b36278848939700&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2974869" author="xgen-internal-githook" created="Thu, 12 Mar 2020 15:20:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Blake Oler&apos;, &apos;username&apos;: &apos;BlakeIsBlake&apos;, &apos;email&apos;: &apos;blake.oler@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45648&quot; title=&quot;Make _configsvrCreateDatabase send _flushDatabaseCacheUpdates to primary shard even if database already existed in config.databases&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45648&quot;&gt;&lt;del&gt;SERVER-45648&lt;/del&gt;&lt;/a&gt; Make _configsvrCreateDatabase send _flushDatabaseCacheUpdates to primary shard even if database already existed in config.databases&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/db3a17bbfe2e265722ed88df961e79f3e1a68067&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/db3a17bbfe2e265722ed88df961e79f3e1a68067&lt;/a&gt;&lt;/p&gt;</comment>
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