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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-35780] `renameCollection` across databases incorrectly timestamps metadata for secondary index builds</title>
                <link>https://jira.mongodb.org/browse/SERVER-35780</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Renaming collections across databases is not a simple rename, but rather a process of:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Creating a temp collection on the destination database + _id index.&lt;/li&gt;
	&lt;li&gt;Build secondary indexes on the temp collection.&lt;/li&gt;
	&lt;li&gt;Insert documents to the temp collection.&lt;/li&gt;
	&lt;li&gt;Rename the temp collection to the desired destination.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Copying the index definitions over uses a &lt;tt&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/c842fb1f6479a6e7299f2bac51dd787393366dd6/src/mongo/db/catalog/rename_collection.cpp#L361&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;single MultiIndexBlock&lt;/a&gt;&lt;/tt&gt;. All of the indexes are generated with &lt;tt&gt;`ready: false`&lt;/tt&gt; writes in one WUOW and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c842fb1f6479a6e7299f2bac51dd787393366dd6/src/mongo/db/catalog/index_create_impl.cpp#L303-L304&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;a single timestamp from a noop oplog entry&lt;/a&gt;. However, committing the &lt;tt&gt;`ready: true`&lt;/tt&gt; writes &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c842fb1f6479a6e7299f2bac51dd787393366dd6/src/mongo/db/catalog/rename_collection.cpp#L397-L405&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;has the following sequence&lt;/a&gt; (for demonstration, suppose two secondary indexes, A and B):&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Begin WT transaction.&lt;/li&gt;
	&lt;li&gt;Set index A to ready.&lt;/li&gt;
	&lt;li&gt;Set index B to ready.&lt;/li&gt;
	&lt;li&gt;Write oplog entry creating A.&lt;/li&gt;
	&lt;li&gt;Set timestamp 1.&lt;/li&gt;
	&lt;li&gt;Write oplog entry creating B.&lt;/li&gt;
	&lt;li&gt;Set timestamp 2.&lt;/li&gt;
	&lt;li&gt;Commit WT transaction.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;In this case, both &lt;tt&gt;`ready: true`&lt;/tt&gt; writes are given timestamp 2. Rolling back inbetween these times will see both indexes as &lt;tt&gt;`ready: false`&lt;/tt&gt;, but replication recovery will only rebuild index B.&lt;/p&gt;

&lt;p&gt;This is an analogous bug to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35070&quot; title=&quot;multi index creates are given wrong timestamps&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35070&quot;&gt;&lt;del&gt;SERVER-35070&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;This ticket should consider adding the following invariant &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c842fb1f6479a6e7299f2bac51dd787393366dd6/src/mongo/db/catalog/index_create_impl.cpp#L519&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;right before here&lt;/a&gt;:&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;   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;        invariant(_indexes.size() == 1 || onCreateFn);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="563862">SERVER-35780</key>
            <summary>`renameCollection` across databases incorrectly timestamps metadata for secondary index builds</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="maria.vankeulen@mongodb.com">Maria van Keulen</assignee>
                                    <reporter username="daniel.gottlieb@mongodb.com">Daniel Gottlieb</reporter>
                        <labels>
                    </labels>
                <created>Mon, 25 Jun 2018 18:00:28 +0000</created>
                <updated>Sun, 29 Oct 2023 22:30:27 +0000</updated>
                            <resolved>Tue, 31 Jul 2018 18:08:25 +0000</resolved>
                                                    <fixVersion>4.0.3</fixVersion>
                    <fixVersion>4.1.2</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1996830" author="xgen-internal-githook" created="Fri, 7 Sep 2018 20:24:04 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Maria van Keulen&apos;, &apos;email&apos;: &apos;maria@mongodb.com&apos;, &apos;username&apos;: &apos;mvankeulen94&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35780&quot; title=&quot;`renameCollection` across databases incorrectly timestamps metadata for secondary index builds&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35780&quot;&gt;&lt;del&gt;SERVER-35780&lt;/del&gt;&lt;/a&gt; Timestamp multiple index builds during rename&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 57d12da516328ddc2102d8f71f9c4ebccb6b349d)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e631a9531fbc3d80945a72d15ae0ac83c76d51af&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e631a9531fbc3d80945a72d15ae0ac83c76d51af&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1961843" author="xgen-internal-githook" created="Tue, 31 Jul 2018 17:52:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Maria van Keulen&apos;, &apos;email&apos;: &apos;maria@mongodb.com&apos;, &apos;username&apos;: &apos;mvankeulen94&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35780&quot; title=&quot;`renameCollection` across databases incorrectly timestamps metadata for secondary index builds&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35780&quot;&gt;&lt;del&gt;SERVER-35780&lt;/del&gt;&lt;/a&gt; Timestamp multiple index builds during rename&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/57d12da516328ddc2102d8f71f9c4ebccb6b349d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/57d12da516328ddc2102d8f71f9c4ebccb6b349d&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="660186">SERVER-38745</issuekey>
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