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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-48245] index drop allowed on drop-pending collection</title>
                <link>https://jira.mongodb.org/browse/SERVER-48245</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When a collection is being dropped using old-style two phase drops (system.drop.* introduced in 3.6), there is a small window in which we may be able to drop indexes on the collection. using its drop-pending namespace. This produces an sequence of operations that may be problematic for a secondary to apply. This is not a common scenario in production because it requires the user to be able to derive the drop-pending namespace of the dropped collection, either from the logs or the oplog, and run the &lt;tt&gt;dropIndexes&lt;/tt&gt;&#160;command on the primary before it is permanently removed by the DropPendingCollectionReaper.&lt;/p&gt;

&lt;p&gt;------ OLD DESCRIPTION BELOW ------&lt;/p&gt;

&lt;p&gt;Old title:&#160; Old-style two-phase drops replicate &apos;dropIndexes&apos; operations after collection &apos;drop&apos;&lt;/p&gt;

&lt;p&gt;Old-style two-phase drops &lt;a href=&quot;https://github.com/mongodb/mongo/blob/0553eb750667692d25959c3b080156a6117789cf/src/mongo/db/catalog/database_impl.cpp#L414-L439&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;write an initial &apos;drop&apos; oplog entry&lt;/a&gt; to rename the collection to a drop-pending namespace. The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/e9d23f4045e9a79bf6caa325da4190da2deb3cc1/src/mongo/db/repl/drop_pending_collection_reaper.cpp#L201&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;DropPendingCollectionReaper&lt;/a&gt; asynchronously drops the collection, which also drops the indexes and replicates the &quot;dropIndexes&quot; oplog entries.&lt;/p&gt;

&lt;p&gt;As a result, the &quot;drop&quot; oplog entry replicates before the &quot;dropIndexes&quot; entry. If a secondary has already applied the &quot;drop&quot; and performed the second drop phase, when it applies the &quot;dropIndexes&quot; operation it will encounter a NamespaceNotFound error in replication, which leads to a crash.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1352707">SERVER-48245</key>
            <summary>index drop allowed on drop-pending collection</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="benety.goh@mongodb.com">Benety Goh</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                    </labels>
                <created>Fri, 15 May 2020 16:05:46 +0000</created>
                <updated>Sun, 29 Oct 2023 22:08:07 +0000</updated>
                            <resolved>Thu, 4 Jun 2020 01:32:49 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                    <fixVersion>4.4.2</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3380944" author="xgen-internal-githook" created="Tue, 8 Sep 2020 21:25:09 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Benety Goh&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;username&apos;: &apos;benety&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48245&quot; title=&quot;index drop allowed on drop-pending collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48245&quot;&gt;&lt;del&gt;SERVER-48245&lt;/del&gt;&lt;/a&gt; disallow index drops on drop-pending namespaces (system.drop.*) if we are primary.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 34b89472092922061c29dbfe72f1f8e4051f7856)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/020b0463d95f8b3d337351955598842528b38c47&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/020b0463d95f8b3d337351955598842528b38c47&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3380886" author="xgen-internal-githook" created="Tue, 8 Sep 2020 20:58:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Benety Goh&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;username&apos;: &apos;benety&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48245&quot; title=&quot;index drop allowed on drop-pending collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48245&quot;&gt;&lt;del&gt;SERVER-48245&lt;/del&gt;&lt;/a&gt; add js test for index drops on drop-pending namespaces&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 93ffa1d804ba78948b1def7134678c28f1dea1b8)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b17e4354cb6bb35ae3db7cde9bacf5e60a101f56&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b17e4354cb6bb35ae3db7cde9bacf5e60a101f56&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3380681" author="xgen-internal-githook" created="Tue, 8 Sep 2020 19:26:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Benety Goh&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;username&apos;: &apos;benety&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48245&quot; title=&quot;index drop allowed on drop-pending collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48245&quot;&gt;&lt;del&gt;SERVER-48245&lt;/del&gt;&lt;/a&gt; add uuid to &quot;CMD: dropIndexes&quot; log message. update checkReplState() arguments&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 6762642daa0cd703873af2d9e364a723d5a64c58)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/568f701aa5d51f35d9736b5b3ee5fba59800416f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/568f701aa5d51f35d9736b5b3ee5fba59800416f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3188914" author="benety.goh" created="Thu, 4 Jun 2020 01:32:26 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Benety Goh&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;username&apos;: &apos;benety&apos;}

&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48245&quot; title=&quot;index drop allowed on drop-pending collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48245&quot;&gt;&lt;del&gt;SERVER-48245&lt;/del&gt;&lt;/a&gt; disallow index drops on drop-pending namespaces (system.drop.*) if we are primary.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/34b89472092922061c29dbfe72f1f8e4051f7856&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/34b89472092922061c29dbfe72f1f8e4051f7856&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3188682" author="benety.goh" created="Wed, 3 Jun 2020 23:43:03 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Benety Goh&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;username&apos;: &apos;benety&apos;}

&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48245&quot; title=&quot;index drop allowed on drop-pending collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48245&quot;&gt;&lt;del&gt;SERVER-48245&lt;/del&gt;&lt;/a&gt; add js test for index drops on drop-pending namespaces&lt;br/&gt;
 Branch: master&lt;br/&gt;
 &lt;a href=&quot;https://github.com/mongodb/mongo/commit/93ffa1d804ba78948b1def7134678c28f1dea1b8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/93ffa1d804ba78948b1def7134678c28f1dea1b8&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3188448" author="xgen-internal-githook" created="Wed, 3 Jun 2020 20:20:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Benety Goh&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;username&apos;: &apos;benety&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48245&quot; title=&quot;index drop allowed on drop-pending collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48245&quot;&gt;&lt;del&gt;SERVER-48245&lt;/del&gt;&lt;/a&gt; add uuid to &quot;CMD: dropIndexes&quot; log message. update checkReplState() arguments&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6762642daa0cd703873af2d9e364a723d5a64c58&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6762642daa0cd703873af2d9e364a723d5a64c58&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3147921" author="benety.goh" created="Sun, 31 May 2020 14:51:34 +0000"  >&lt;p&gt;We should look into how the DropPendingCollectionReaper is able to replicate &quot;dropIndexes&quot; oplog entries while &lt;a href=&quot;https://github.com/mongodb/mongo/blob/e9d23f4045e9a79bf6caa325da4190da2deb3cc1/src/mongo/db/repl/drop_pending_collection_reaper.cpp#L186&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;replicated writes are disabled&lt;/a&gt;.&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="1275848">SERVER-46892</issuekey>
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