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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-31231] prevent addShard and shardCollection from running concurrently with setFCV</title>
                <link>https://jira.mongodb.org/browse/SERVER-31231</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;b&gt;addShard&lt;/b&gt; (that is, the _configsvrAddShard command) &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.5.13/src/mongo/s/catalog/sharding_catalog_manager_shard_operations.cpp#L639-L648&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;sends setFeatureCompatibilityVersion to the to-be-added shard&lt;/a&gt;, to set the shard&apos;s FCV to match the cluster&apos;s.&lt;/p&gt;

&lt;p&gt;If addShard runs concurrently with setFCV, the added shard can end up with the wrong FCV:&lt;/p&gt;

&lt;p&gt;1) setFCV=&quot;3.6&quot; called against a mongos, which forwards _configsvrSetFCV to the config server&lt;br/&gt;
2) configsvrSetFCV finishes sending setFCV to all existing shards&lt;br/&gt;
3) addShard is called&lt;br/&gt;
    --&amp;gt; the FCV on the config server hasn&apos;t been set to 3.6 yet, so addShard will send setFCV=3.4 to the to-be-added shard&lt;/p&gt;

&lt;p&gt;This ticket should make the addShard command take the featureCompatibilityVersionLock ResourceMutex.&lt;/p&gt;

&lt;p&gt;Similarly, &lt;b&gt;shardCollection&lt;/b&gt; (that is, the _configsvrShardCollection command) &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.5.13/src/mongo/db/s/config/configsvr_shard_collection_command.cpp#L637-L684&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;asks the primary shard for the collection&apos;s UUID&lt;/a&gt;, if the config server&apos;s FCV is 3.6 or is being upgraded to 3.6. &lt;/p&gt;

&lt;p&gt;If shardCollection runs concurrently with setFCV, the collection&apos;s entry in config.collections can end up without a UUID:&lt;/p&gt;

&lt;p&gt;1) shardCollection checks FCV, sees that it is 3.4, so does not ask primary shard for a UUID&lt;br/&gt;
2) setFCV=&quot;3.6&quot; called, and config server sets FCV to (3.4, 3.6) aka upgrading&lt;br/&gt;
3) config server generates UUIDs for existing sharded collections&lt;br/&gt;
4) config server sends setFCV to shards&lt;br/&gt;
5) config server finishes upgrade, sets FCV to 3.6&lt;br/&gt;
6) shardCollection persists entry without a UUID in &apos;config.collections&apos; for newly sharded collection&lt;/p&gt;</description>
                <environment></environment>
        <key id="431163">SERVER-31231</key>
            <summary>prevent addShard and shardCollection from running concurrently with setFCV</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="esha.maharishi@mongodb.com">Esha Maharishi</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                    </labels>
                <created>Fri, 22 Sep 2017 21:54:50 +0000</created>
                <updated>Mon, 30 Oct 2023 23:13:23 +0000</updated>
                            <resolved>Mon, 9 Oct 2017 14:59:02 +0000</resolved>
                                    <version>3.5.13</version>
                                    <fixVersion>3.6.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1693054" author="xgen-internal-githook" created="Mon, 9 Oct 2017 14:58:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;esha.maharishi@mongodb.com&apos;, &apos;name&apos;: &apos;Esha Maharishi&apos;, &apos;username&apos;: &apos;EshaMaharishi&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31231&quot; title=&quot;prevent addShard and shardCollection from running concurrently with setFCV&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31231&quot;&gt;&lt;del&gt;SERVER-31231&lt;/del&gt;&lt;/a&gt; prevent addShard and shardCollection from running concurrently with setFCV&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a6db2621e6376df07f368ab4c4028843015dfa51&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a6db2621e6376df07f368ab4c4028843015dfa51&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="419351">SERVER-30793</issuekey>
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