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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-63892] Update namespace on acquiring locks for a collection using UUID during dropIndex</title>
                <link>https://jira.mongodb.org/browse/SERVER-63892</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;While running &lt;a href=&quot;https://github.com/mongodb/mongo/blob/239052f6e878dcf0892a8ae33b9e69c30a6ffc6d/src/mongo/db/catalog/drop_indexes.cpp#L345&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;dropIndex&lt;/a&gt; command:&lt;br/&gt;
 1- We acquire the lock of the collection &lt;a href=&quot;https://github.com/mongodb/mongo/blob/239052f6e878dcf0892a8ae33b9e69c30a6ffc6d/src/mongo/db/catalog/drop_indexes.cpp#L352&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;using namespace&lt;/a&gt;.&lt;br/&gt;
 2- We take a copy of the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/239052f6e878dcf0892a8ae33b9e69c30a6ffc6d/src/mongo/db/catalog/drop_indexes.cpp#L357-L358&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;collectionUUID &amp;amp; the namespace&lt;/a&gt;.&lt;br/&gt;
 3- We &lt;a href=&quot;https://github.com/mongodb/mongo/blob/239052f6e878dcf0892a8ae33b9e69c30a6ffc6d/src/mongo/db/catalog/drop_indexes.cpp#L401&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;release the lock&lt;/a&gt; of the collection because of (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46216&quot; title=&quot;The dropIndexes command should not hold the global lock throughout the duration of the command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46216&quot;&gt;&lt;del&gt;SERVER-46216&lt;/del&gt;&lt;/a&gt;).&lt;br/&gt;
 4- We &lt;a href=&quot;https://github.com/mongodb/mongo/blob/239052f6e878dcf0892a8ae33b9e69c30a6ffc6d/src/mongo/db/catalog/drop_indexes.cpp#L420&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;reacquire the lock&lt;/a&gt; of the collection using db and collectionUUID.&lt;br/&gt;
 5- after that we hit &lt;a href=&quot;https://github.com/mongodb/mongo/blob/239052f6e878dcf0892a8ae33b9e69c30a6ffc6d/src/mongo/db/catalog/drop_indexes.cpp#L440-L443&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;some code paths&lt;/a&gt; that assert that the locks for the namespace should be acquired.&lt;/p&gt;

&lt;p&gt;The issue happens when there is a concurrent renaming happening, so the namespace of the collection can be changed between &lt;b&gt;step 3 &amp;amp; 4&lt;/b&gt;, so any code path that checks for the locks for the old namespace will fail.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Suggestions:&lt;/b&gt;&#160;&lt;br/&gt;
 1- To update the local copy of the namespace of the collection each time we reacquire the lock on &lt;a href=&quot;https://github.com/mongodb/mongo/blob/239052f6e878dcf0892a8ae33b9e69c30a6ffc6d/src/mongo/db/catalog/drop_indexes.cpp#L421&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;step 4.&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;2- (Harder) to make sure that after we release the lock on &lt;b&gt;step 3&lt;/b&gt;, we don&apos;t use the namespace and replace it with db &amp;amp; uuid. &lt;br/&gt;
 &#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1988251">SERVER-63892</key>
            <summary>Update namespace on acquiring locks for a collection using UUID during dropIndex</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="gregory.noma@mongodb.com">Gregory Noma</assignee>
                                    <reporter username="m.maher@mongodb.com">Moustafa Maher</reporter>
                        <labels>
                    </labels>
                <created>Tue, 22 Feb 2022 22:54:13 +0000</created>
                <updated>Sun, 29 Oct 2023 21:42:06 +0000</updated>
                            <resolved>Fri, 25 Feb 2022 21:07:20 +0000</resolved>
                                                    <fixVersion>6.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4378210" author="xgen-internal-githook" created="Fri, 25 Feb 2022 21:00:56 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Noma&apos;, &apos;email&apos;: &apos;gregory.noma@gmail.com&apos;, &apos;username&apos;: &apos;gregorynoma&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63892&quot; title=&quot;Update namespace on acquiring locks for a collection using UUID during dropIndex&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63892&quot;&gt;&lt;del&gt;SERVER-63892&lt;/del&gt;&lt;/a&gt; Update namespace after dropping locks for `dropIndexes`&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/60bebe12f557f9126184f500dff8c8673ebd526a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/60bebe12f557f9126184f500dff8c8673ebd526a&lt;/a&gt;&lt;/p&gt;</comment>
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