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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-10295] Consider propagating dropDatabase() command to all non-primary shards in all circumstances</title>
                <link>https://jira.mongodb.org/browse/SERVER-10295</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A &quot;&lt;tt&gt;show dbs&lt;/tt&gt;&quot; command sent to a mongos always propagates a &lt;tt&gt;listDatabases&lt;/tt&gt; command to all shards. On the other hand, a &quot;&lt;tt&gt;drop database&lt;/tt&gt;&quot; command only propagates the &lt;tt&gt;dropDatabase&lt;/tt&gt; command to non-primary shards that the mongos thinks contains sharded data (from the information in the config database).&lt;/p&gt;

&lt;p&gt;This could be interpreted as inconsistent, and it results in an inability to drop a database from the mongos in the following scenario:&lt;/p&gt;

&lt;p&gt;1. A sharded collection does not contain any chunks on a particular non-primary shard. Somehow, however, data is stored in a non-primary shard of a database, without it being recorded in the config database. The obvious example of this happening is if the user inserts data in the database directly in a mongod, without going via the mongos.&lt;/p&gt;

&lt;p&gt;2. The user drops the database via the mongos.&lt;/p&gt;

&lt;p&gt;3. The user runs the &quot;&lt;tt&gt;show dbs&lt;/tt&gt;&quot; command from the mongos. The database that had the data stored directly in the non-primary shard is included in the list returned.&lt;/p&gt;

&lt;p&gt;4. Subsequent attempts to drop the database via the mongos will also fail.&lt;/p&gt;

&lt;p&gt;The attached jstest demonstrates the above scenario.&lt;/p&gt;

&lt;p&gt;I realise that it is highly debatable whether we should actually delete the data from the non-primary shard in this case. Some users, however, have expressed surprise at the current behaviour. As such, I thought it worth raising this so that it can at least be evaluated whether to stick with the current behaviour or to change.&lt;/p&gt;</description>
                <environment></environment>
        <key id="83184">SERVER-10295</key>
            <summary>Consider propagating dropDatabase() command to all non-primary shards in all circumstances</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="9">Done</resolution>
                                        <assignee username="greg_10gen">Greg Studer</assignee>
                                    <reporter username="jantje.daniel">Ian Daniel</reporter>
                        <labels>
                    </labels>
                <created>Tue, 23 Jul 2013 07:39:02 +0000</created>
                <updated>Wed, 10 Dec 2014 23:10:31 +0000</updated>
                            <resolved>Mon, 5 Aug 2013 14:41:18 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="396072" author="greg_10gen" created="Mon, 5 Aug 2013 14:46:59 +0000"  >&lt;p&gt;See linked issue.&lt;/p&gt;</comment>
                            <comment id="396064" author="greg_10gen" created="Mon, 5 Aug 2013 14:41:18 +0000"  >&lt;p&gt;Resolved as WAD - this solution would introduce scalability problems for large clusters, and the issue here is more an abstraction violation of listDatabases through mongos than a problem with dropDatabase.  &lt;/p&gt;

&lt;p&gt;The cleanup problem is real, however - and we&apos;re definitely working on / would consider further solutions to make it easier to do &quot;garbage collection&quot; on clusters.  Ideally these would be automated.&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="84672">SERVER-10434</issuekey>
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                <attachments>
                            <attachment id="29126" name="SERVER-10295.js" size="1153" author="linda.qin@mongodb.com" created="Tue, 23 Jul 2013 07:49:39 +0000"/>
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