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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-56173] FCV upgrade to 5.0 can fail in presence of concurrent collection drop</title>
                <link>https://jira.mongodb.org/browse/SERVER-56173</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;With featureFlagShardingFullDDLSupportTimestampedVersion enabled, the FCV upgrade process can fail upon the following sequence of events:&lt;br/&gt;
1. Shards enter phase1 of the FCV update. (Meaning they will still use the legacy DDL paths)&lt;br/&gt;
2. The configsvr &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bbc7fb75ef48ae650124a54b205e0fcf8a646740/src/mongo/db/s/config/sharding_catalog_manager.cpp#L744&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;reads the current sharded collections&lt;/a&gt;, and performs the phase1 of the metadata patchup.&lt;br/&gt;
2. A collection is dropped. The legacy path first &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bbc7fb75ef48ae650124a54b205e0fcf8a646740/src/mongo/db/s/drop_collection_legacy.cpp#L291&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;deletes the chunks&lt;/a&gt;, but it has &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bbc7fb75ef48ae650124a54b205e0fcf8a646740/src/mongo/db/s/drop_collection_legacy.cpp#L300-L304&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;not yet deleted the config.collections document&lt;/a&gt;.&lt;br/&gt;
3. The configsvr, as part of the setFCV procedure, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bbc7fb75ef48ae650124a54b205e0fcf8a646740/src/mongo/db/s/config/sharding_catalog_manager.cpp#L821&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;tells shards to refresh that collection&lt;/a&gt;. The shards will try to refresh their catalog cache, but &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bbc7fb75ef48ae650124a54b205e0fcf8a646740/src/mongo/s/catalog/sharding_catalog_client_impl.cpp#L783-L785&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;it will fail with ConflictingOperationInProgress&lt;/a&gt; (because the config.collections document still exists, but no chunk was found).&lt;/p&gt;

&lt;p&gt;This could be solved by either catching the ConflictingOperationInProgress error, or by telling the shards to refresh after they have entered phase2 of the FCV (because on the new DDL path, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bbc7fb75ef48ae650124a54b205e0fcf8a646740/src/mongo/db/s/sharding_ddl_util.cpp#L160-L162&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;dropCollection first deletes the config.collections document, and later the chunks&lt;/a&gt;.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="1682891">SERVER-56173</key>
            <summary>FCV upgrade to 5.0 can fail in presence of concurrent collection drop</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>Mon, 19 Apr 2021 16:44:39 +0000</created>
                <updated>Sun, 29 Oct 2023 21:54:47 +0000</updated>
                            <resolved>Mon, 26 Apr 2021 10:28:51 +0000</resolved>
                                                    <fixVersion>5.0.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3738016" author="xgen-internal-githook" created="Mon, 26 Apr 2021 10:22:50 +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-56173&quot; title=&quot;FCV upgrade to 5.0 can fail in presence of concurrent collection drop&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56173&quot;&gt;&lt;del&gt;SERVER-56173&lt;/del&gt;&lt;/a&gt;: FCV upgrade to 5.0 can fail to refresh collection on shards in presence of concurrent drop&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6fb420bca5031e4864db1260a490b21cc699a129&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6fb420bca5031e4864db1260a490b21cc699a129&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1663262">SERVER-55637</issuekey>
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