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    <title>MongoDB Jira</title>
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    <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-68199] An active index build on the existing target collection of a renameCollection command can fail the mongod</title>
                <link>https://jira.mongodb.org/browse/SERVER-68199</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="2096349">SERVER-68199</key>
            <summary>An active index build on the existing target collection of a renameCollection command can fail the mongod</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="dianna.hohensee@mongodb.com">Dianna Hohensee</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                    </labels>
                <created>Thu, 21 Jul 2022 13:34:56 +0000</created>
                <updated>Sun, 29 Oct 2023 21:35:28 +0000</updated>
                            <resolved>Mon, 25 Jul 2022 20:22:51 +0000</resolved>
                                    <version>4.2.21</version>
                                    <fixVersion>4.2.22</fixVersion>
                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="4702850" author="xgen-internal-githook" created="Mon, 25 Jul 2022 17:32:33 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Dianna Hohensee&apos;, &apos;email&apos;: &apos;dianna.hohensee@mongodb.com&apos;, &apos;username&apos;: &apos;DiannaHohensee&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-68199&quot; title=&quot;An active index build on the existing target collection of a renameCollection command can fail the mongod&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-68199&quot;&gt;&lt;del&gt;SERVER-68199&lt;/del&gt;&lt;/a&gt; Rename collection must check for index builds on the target collection before specially dropping indexes with names that are too long&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c808bc35dfe537a68961ec0fdfa5864793d550d7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c808bc35dfe537a68961ec0fdfa5864793d550d7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4701639" author="gregory.wlodarek" created="Mon, 25 Jul 2022 13:11:58 +0000"  >&lt;p&gt;Your suggestion to add an in-progress index build check before calling &lt;tt&gt;dropIndexesThatWillBeTooLongAfterDropPendingRename&lt;/tt&gt; makes the most sense to me &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=dianna.hohensee%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;dianna.hohensee@mongodb.com&quot;&gt;dianna.hohensee@mongodb.com&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="4696758" author="dianna.hohensee" created="Thu, 21 Jul 2022 20:28:07 +0000"  >&lt;p&gt;I looked into removing the dropIndexesThatWillBeTooLongAfterDropPendingRename call. We still rename collections out of the way for dropCollection for storage engines that do not support execution layer two-phase drop. Replication uses the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/16acd82faa5c42a8447619b1cb18e5da341185c8/src/mongo/db/catalog/database_impl.cpp#L437-L450&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;DropPendingCollectionReaper after renaming the dropped collection out of the way&lt;/a&gt;, if execution two-phase drop isn&apos;t supported. Otherwise, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/16acd82faa5c42a8447619b1cb18e5da341185c8/src/mongo/db/catalog/database_impl.cpp#L396-L418&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;execution two-phase drop obviates the need&lt;/a&gt;. In v4.2, regardless of FCV 4.0 or 4.2, however, the server seems just fine if I remove the dropIndexesThatWillBeTooLongAfterDropPendingRename call.&lt;/p&gt;

&lt;p&gt;In v4.2, we do not need dropIndexesThatWillBeTooLongAfterDropPendingRename. We might still want to use it in FCV 4.0 in case binary downgrade to v3.6 occurs before the drop-pending namespace gets dropped? I haven&apos;t looked into the downgrade story from v4.2 to v3.6 for long index/collection names. If we do keep the function, then we just need to add a in-progress index build check to the path.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=gregory.wlodarek%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;gregory.wlodarek@mongodb.com&quot;&gt;gregory.wlodarek@mongodb.com&lt;/a&gt;&#160;do you have any recommendations / knowledge add? IIRC, you worked on supporting longer names?&lt;/p&gt;</comment>
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