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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-52728] Upgrade path from MongoDB 2.4 to 4.2 causes config servers to go down</title>
                <link>https://jira.mongodb.org/browse/SERVER-52728</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;b&gt;Issue&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;A customer was upgrading from 2.4 to 4.2 and config servers crash because of a conflicting index name in the lockping collection.&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;
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					&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;2020-11-03T10:57:41.080+0000 F - [rsSync-0] Fatal assertion 40184 IndexOptionsConflict: Failed to initialize config database on config server&apos;s first transition to primary :: caused by :: couldn&apos;t create lockping ping time index on config db :: caused by :: Index with name: ping_1 already exists with a different name at src/mongo/db/repl/replication_coordinator_external_state_impl.cpp 773&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;In 2.4.3, a bug caused the &quot;ping_&quot; index to be created (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-9399&quot; title=&quot;Invalid index on config.lockpings on the 2.4.1 config server&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-9399&quot;&gt;&lt;del&gt;SERVER-9399&lt;/del&gt;&lt;/a&gt;). Upgrading from 4.0 to 4.2, they crossed the boundary of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33149&quot; title=&quot;createIndexes fails to report an error when index is not created with the specified name&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33149&quot;&gt;&lt;del&gt;SERVER-33149&lt;/del&gt;&lt;/a&gt; which changed the behavior when an index is created with the same options but of a different name, emitting an error. The secondaries fail to create &quot;ping_1&quot; due to this new behavior.&#160;&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Suggested Fix&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;It would be helpful to soften the check on index &quot;ping_1&quot; so upgrading from 2.4 doesn&apos;t come across with that error.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1537531">SERVER-52728</key>
            <summary>Upgrade path from MongoDB 2.4 to 4.2 causes config servers to go down</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="haley.connelly@mongodb.com">Haley Connelly</assignee>
                                    <reporter username="edwin.zhou@mongodb.com">Edwin Zhou</reporter>
                        <labels>
                    </labels>
                <created>Mon, 9 Nov 2020 22:39:03 +0000</created>
                <updated>Sun, 29 Oct 2023 22:00:39 +0000</updated>
                            <resolved>Wed, 18 Aug 2021 13:32:11 +0000</resolved>
                                                    <fixVersion>4.2.16</fixVersion>
                                                        <votes>0</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="4005540" author="xgen-internal-githook" created="Tue, 17 Aug 2021 23:11:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Haley Connelly&apos;, &apos;email&apos;: &apos;haley.connelly@mongodb.com&apos;, &apos;username&apos;: &apos;haleyConnelly&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-52728&quot; title=&quot;Upgrade path from MongoDB 2.4 to 4.2 causes config servers to go down&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-52728&quot;&gt;&lt;del&gt;SERVER-52728&lt;/del&gt;&lt;/a&gt; Upgrade path from mongoDB 2.4 to 4.2 requires dropping ping_ index&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7853d994db8831e1f91e6c2a59cb01d26f1e6e45&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7853d994db8831e1f91e6c2a59cb01d26f1e6e45&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3488307" author="connie.chen" created="Thu, 12 Nov 2020 20:36:54 +0000"  >&lt;p&gt;We should error if this ping index is detected on FCV upgrade to 4.2&lt;/p&gt;</comment>
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