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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-47319] dropIndexes will invariant if it sees complete indexes after successfully aborting a different index build</title>
                <link>https://jira.mongodb.org/browse/SERVER-47319</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/0decca93cfd99752e7918e3ca8ecf6255d6069f2/src/mongo/db/catalog/drop_indexes.cpp#L424&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;An invariant can fail in dropIndexes&lt;/a&gt; given the following sequence between command threads A, B, and C:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;A: Start an index build on {a: 1}&lt;/li&gt;
	&lt;li&gt;B: dropIndexes: {a: 1}
	&lt;ul&gt;
		&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/0decca93cfd99752e7918e3ca8ecf6255d6069f2/src/mongo/db/catalog/drop_indexes.cpp#L337&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Aborts the active index build&lt;/a&gt;&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
	&lt;li&gt;C: Start and &lt;em&gt;finish&lt;/em&gt; another index build on {a: 1}&lt;/li&gt;
	&lt;li&gt;B: dropIndexes does not retry aborting&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/0decca93cfd99752e7918e3ca8ecf6255d6069f2/src/mongo/db/catalog/drop_indexes.cpp#L377&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;because it sees no active index build&lt;/a&gt;
	&lt;ul&gt;
		&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/0decca93cfd99752e7918e3ca8ecf6255d6069f2/src/mongo/db/catalog/drop_indexes.cpp#L424&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;invariant fails&lt;/a&gt; because the {a: 1} index is completed even though it was successfully aborted&#160;&lt;/li&gt;
		&lt;li&gt;This is because an index by the same name was able to start and commit &lt;a href=&quot;https://github.com/mongodb/mongo/blob/0decca93cfd99752e7918e3ca8ecf6255d6069f2/src/mongo/db/catalog/drop_indexes.cpp#L344-L353&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;after waiting for the build to complete and before retaking the collection X lock&lt;/a&gt;.&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Part of the problem here is that index names are not unique to index builds, so while the dropIndexes command can successfully abort an index build, another index by the same name could be created again in a brief window of time before it reacquires its locks.&lt;/p&gt;

&lt;p&gt;In this scenario, we should consider dropping the finished index if we discover that it exists.&#160; &lt;a href=&quot;https://github.com/mongodb/mongo/blame/f042509f1c46e292cc14af7c7ba23b9cc97c5185/src/mongo/db/catalog/drop_indexes.cpp#L412-L442&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;This was the previous behavior&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1303478">SERVER-47319</key>
            <summary>dropIndexes will invariant if it sees complete indexes after successfully aborting a different index build</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.wlodarek@mongodb.com">Gregory Wlodarek</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                    </labels>
                <created>Fri, 3 Apr 2020 14:56:27 +0000</created>
                <updated>Sun, 29 Oct 2023 22:09:57 +0000</updated>
                            <resolved>Tue, 5 May 2020 19:54:38 +0000</resolved>
                                                    <fixVersion>4.4.0-rc4</fixVersion>
                    <fixVersion>4.7.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3070465" author="xgen-internal-githook" created="Tue, 5 May 2020 21:22:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;, &apos;username&apos;: &apos;GWlodarek&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47319&quot; title=&quot;dropIndexes will invariant if it sees complete indexes after successfully aborting a different index build&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47319&quot;&gt;&lt;del&gt;SERVER-47319&lt;/del&gt;&lt;/a&gt; dropIndexes should not invariant if a similar index was created while yielding locks to abort different indexes&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 60b2655e069a30dfa1656809b1ae25d77617292c)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1e525750c99b70e21af0b20d4c29159f8329c008&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1e525750c99b70e21af0b20d4c29159f8329c008&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3070236" author="xgen-internal-githook" created="Tue, 5 May 2020 19:52:16 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;, &apos;username&apos;: &apos;GWlodarek&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47319&quot; title=&quot;dropIndexes will invariant if it sees complete indexes after successfully aborting a different index build&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47319&quot;&gt;&lt;del&gt;SERVER-47319&lt;/del&gt;&lt;/a&gt; dropIndexes should not invariant if a similar index was created while yielding locks to abort different indexes&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/60b2655e069a30dfa1656809b1ae25d77617292c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/60b2655e069a30dfa1656809b1ae25d77617292c&lt;/a&gt;&lt;/p&gt;</comment>
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