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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-47372] config.cache collections can remain even after collection has been dropped</title>
                <link>https://jira.mongodb.org/browse/SERVER-47372</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Which can lead to secondaries believing that collection is still sharded.&lt;/p&gt;

&lt;p&gt;setup:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;collection test.user is sharded&lt;/li&gt;
	&lt;li&gt;1 shard, current primary: nodeA&lt;/li&gt;
	&lt;li&gt;shard&apos;s nodeB never heard about test.user, so it never had any catalog cache entries.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;1. _configsvrDrop deletes all config.chunks and config.collections.&lt;br/&gt;
2. nodeA steps down, and nodeB becomes new primary.&lt;br/&gt;
3. _configsvrDrop sends setShardVersion (0,0) to all shards. Since nodeB never had any entries, set shard version was a no-op.&lt;br/&gt;
4. If secondary read with shard version comes to nodeA, it will try to ask nodeB (the primary) to refresh with _flushRoutingTableCacheUpdates.&lt;br/&gt;
5. nodeB will end up calling &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.3.5/src/mongo/s/catalog_cache.cpp#L237&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;getDatabase&lt;/a&gt; and load all sharded collections under that database, but since test.user is already dropped, it will be &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.3.5/src/mongo/s/catalog_cache.cpp#L183&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;skipped&lt;/a&gt;.&lt;br/&gt;
6. So nodeB will end up &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.3.5/src/mongo/s/catalog_cache.cpp#L253&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;returning early&lt;/a&gt; without asking the CatalogCacheLoader to reload. The consequence is that since the catalog cache loader did not perform the reload, the config.cache collections for test.user will remain untouched.&lt;br/&gt;
7. nodeA gets ok response from _flushRoutingTableCacheUpdates, and then tries to check the version via reading config.cache.chunks, and will find out that there are still documents and erroneously believe that collection is still sharded.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1306191">SERVER-47372</key>
            <summary>config.cache collections can remain even after collection has been dropped</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="13201">Fixed</resolution>
                                        <assignee username="antonio.fuschetto@mongodb.com">Antonio Fuschetto</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                            <label>sharding-causes-bfs-hard</label>
                    </labels>
                <created>Mon, 6 Apr 2020 21:37:13 +0000</created>
                <updated>Sun, 29 Oct 2023 22:09:51 +0000</updated>
                            <resolved>Thu, 1 Jul 2021 07:08:51 +0000</resolved>
                                                    <fixVersion>5.0.2</fixVersion>
                    <fixVersion>5.1.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="3951408" author="xgen-internal-githook" created="Tue, 20 Jul 2021 08:04:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Antonio Fuschetto&apos;, &apos;email&apos;: &apos;antonio.fuschetto@mongodb.com&apos;, &apos;username&apos;: &apos;afuschetto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47372&quot; title=&quot;config.cache collections can remain even after collection has been dropped&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47372&quot;&gt;&lt;del&gt;SERVER-47372&lt;/del&gt;&lt;/a&gt; config.cache collections can remain even after collection has been dropped&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7bf25928a275bfbd22e85d6dcb8856f9cac4f62b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7bf25928a275bfbd22e85d6dcb8856f9cac4f62b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3911324" author="xgen-internal-githook" created="Wed, 30 Jun 2021 23:39:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Antonio Fuschetto&apos;, &apos;email&apos;: &apos;antonio.fuschetto@mongodb.com&apos;, &apos;username&apos;: &apos;afuschetto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47372&quot; title=&quot;config.cache collections can remain even after collection has been dropped&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47372&quot;&gt;&lt;del&gt;SERVER-47372&lt;/del&gt;&lt;/a&gt; config.cache collections can remain even after collection has been dropped&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d635f733ad873fd469cf3e35e27452c45f1597c9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d635f733ad873fd469cf3e35e27452c45f1597c9&lt;/a&gt;&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="533106">SERVER-34632</issuekey>
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