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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <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-9496] Drop sharded collection the drop of sharded db leaves data on non-primary shards</title>
                <link>https://jira.mongodb.org/browse/SERVER-9496</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Assuming 2+ shards&lt;/p&gt;

&lt;p&gt;Repro Steps:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;sh.enableSharding(&quot;foo&quot;);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;sh.shardCollection(&quot;foo.bar&quot;, {x:1});&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;for(i=0;i&amp;lt;500000;i++){db.getSiblingDB(&quot;foo&quot;).bar.insert({x:i});}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;//For Migrations&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;sleep(60);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.getSiblingDB(&quot;foo&quot;).bar.drop();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.getSiblingDB(&quot;foo&quot;).dropDatabase();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Check and confirm on the shard servers the amount of data remaining.&lt;/p&gt;

&lt;p&gt;Primary shard will have no data for this database.&lt;/p&gt;

&lt;p&gt;Secondary shards will still have db files existing as the MongoS did not route the drop command to these shards.&lt;/p&gt;

&lt;p&gt;The drop of the database should be routed to the non-primary shards to cleanup. We should do some preflight checks before the drop and then use that to help determine where the drops are needed.&lt;/p&gt;</description>
                <environment></environment>
        <key id="73389">SERVER-9496</key>
            <summary>Drop sharded collection the drop of sharded db leaves data on non-primary shards</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="david.hows">David Hows</reporter>
                        <labels>
                    </labels>
                <created>Mon, 29 Apr 2013 00:20:55 +0000</created>
                <updated>Fri, 7 Jun 2013 13:36:45 +0000</updated>
                            <resolved>Fri, 7 Jun 2013 13:36:45 +0000</resolved>
                                                                                        <votes>1</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="323758" author="david.hows" created="Mon, 29 Apr 2013 03:35:51 +0000"  >&lt;p&gt;Its an edge case, no doubt. But surely something we can do some checks for.&lt;/p&gt;

&lt;blockquote&gt;&lt;p&gt;What if there is data in other collections there?&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;I assume you mean non-sharded collections? If so, this would apply on the primary shard as well.&lt;/p&gt;

&lt;blockquote&gt;&lt;p&gt;I&apos;m a little confused by your comments starting with &quot;Primary shard will be empty&quot;. Perhaps writing this as jstest will make it more clear exactly what you expect to happen and for the behaviors to be.&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;I&apos;ve re-worded that bit and attached a JStest.&lt;/p&gt;

&lt;blockquote&gt;&lt;p&gt;I think what you are describing is that the collections are removed but the db isn&apos;t dropped on shards which only had sharded collections.&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;Correct. &lt;/p&gt;</comment>
                            <comment id="323705" author="scotthernandez" created="Mon, 29 Apr 2013 00:49:03 +0000"  >&lt;p&gt;What if there is data in other collections there?&lt;/p&gt;

&lt;p&gt;I&apos;m a little confused by your comments starting with &quot;Primary shard will be empty&quot;. Perhaps writing this as jstest will make it more clear exactly what you expect to happen and for the behaviors to be.&lt;/p&gt;

&lt;p&gt;I think what you are describing is that the collections are removed but the db isn&apos;t dropped on shards which only had sharded collections.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                            <outwardlinks description="duplicates">
                                        <issuelink>
            <issuekey id="27068">SERVER-4537</issuekey>
        </issuelink>
                            </outwardlinks>
                                                        </issuelinktype>
                    </issuelinks>
                <attachments>
                            <attachment id="26409" name="drop_sharded_db_col.js" size="1069" author="david.hows" created="Mon, 29 Apr 2013 03:36:48 +0000"/>
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