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    <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-56399] Configsvr step-up can fail after stepping-down during setFCV metadata patch-up</title>
                <link>https://jira.mongodb.org/browse/SERVER-56399</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Provided that featureFlagShardingFullDDLSupportTimestampedVersion is enabled, consider the following situation:&lt;br/&gt;
1. Configsvr starts fcv upgrade 4.4 -&amp;gt; 5.0. Thus, persists kUpgradingFrom44To50 fcv value.&lt;br/&gt;
2. &lt;a href=&quot;https://github.com/mongodb/mongo/blob/7edd66e0a235f420f65eda1d5dc338f30d5fdcd0/src/mongo/db/commands/set_feature_compatibility_version_command.cpp#L464&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Metadata patchup for phase-1&lt;/a&gt; completes: This means that chunks now have uuid, we have build the uuid_1_* indexes and dropped the ns_1_* indexes for config.chunks.&lt;br/&gt;
3. &lt;a href=&quot;https://github.com/mongodb/mongo/blob/7edd66e0a235f420f65eda1d5dc338f30d5fdcd0/src/mongo/db/commands/set_feature_compatibility_version_command.cpp#L479&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Metadata patchup for phase-2&lt;/a&gt; is in progress. We have (partially or completely) &lt;a href=&quot;https://github.com/mongodb/mongo/blob/ec0c168918b688d2b11505f41a014bbb428e03a5/src/mongo/db/s/config/sharding_catalog_manager.cpp#L888-L894&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;$unset the ns from the chunks&lt;/a&gt;.&lt;br/&gt;
4. Before transitioning to fcv kVersion50, the configsvr steps down&lt;br/&gt;
5. The new configsvr primary steps up, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/7edd66e0a235f420f65eda1d5dc338f30d5fdcd0/src/mongo/db/repl/replication_coordinator_external_state_impl.cpp#L838&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ShardingCatalogManager::initializeConfigDatabaseIfNeeded is called&lt;/a&gt;, which will call &lt;a href=&quot;https://github.com/mongodb/mongo/blob/ec0c168918b688d2b11505f41a014bbb428e03a5/src/mongo/db/s/config/sharding_catalog_manager.cpp#L432-L444&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ShardingCatalogManager::_initConfigIndexes&lt;/a&gt;. Because the current fcv value is kUpgradingFrom44To50, it will create the indexes for ns_1_*, but he have already $unset the &apos;ns&apos; fields from the config.chunks, so it will fail due to DuplicateKey errors.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="1693060">SERVER-56399</key>
            <summary>Configsvr step-up can fail after stepping-down during setFCV metadata patch-up</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="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</assignee>
                                    <reporter username="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</reporter>
                        <labels>
                            <label>PM-1965-Milestone-0-Metadata-Format</label>
                    </labels>
                <created>Tue, 27 Apr 2021 16:25:45 +0000</created>
                <updated>Sun, 29 Oct 2023 21:54:25 +0000</updated>
                            <resolved>Thu, 29 Apr 2021 08:56:49 +0000</resolved>
                                                    <fixVersion>5.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3745976" author="xgen-internal-githook" created="Thu, 29 Apr 2021 08:53:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Serra Torrens&apos;, &apos;email&apos;: &apos;jordi.serra-torrens@mongodb.com&apos;, &apos;username&apos;: &apos;jordist&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56399&quot; title=&quot;Configsvr step-up can fail after stepping-down during setFCV metadata patch-up&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56399&quot;&gt;&lt;del&gt;SERVER-56399&lt;/del&gt;&lt;/a&gt; Configsvr step-up can fail after stepping-down during setFCV metadata patch-up&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/731864699b5e71e57ea6bf27a38670ccfebab652&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/731864699b5e71e57ea6bf27a38670ccfebab652&lt;/a&gt;&lt;/p&gt;</comment>
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