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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-49544] Config server should send setFCV to all shards in parallel</title>
                <link>https://jira.mongodb.org/browse/SERVER-49544</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, the config server &lt;a href=&quot;https://github.com/mongodb/mongo/blob/5446d926d8d21f3dd583b26980308519a2b67708/src/mongo/db/s/config/sharding_catalog_manager.cpp#L308-L331&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;sends setFCV to shards serially&lt;/a&gt;, meaning on large clusters where setFCV on each shard takes a long time, the overall setFCV across the cluster becomes extremely long.&lt;/p&gt;

&lt;p&gt;Instead, the config server could use the AsyncRequestsSender to send setFCV in parallel, similar to what is done &lt;a href=&quot;https://github.com/mongodb/mongo/blob/5446d926d8d21f3dd583b26980308519a2b67708/src/mongo/s/transaction_router.cpp#L177-L216&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Note that this will introduce a new possible cluster state where two shards are both in &quot;upgrading&quot; or &quot;downgrading&quot; and communicate with each other (via e.g., $out or chunk migration). Though some users turn the balancer off during setFCV, this is not intended to be a requirement, so we may want to add test cases to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/v4.4/jstests/multiVersion/migrations_with_mixed_fcv.js&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;migrations_with_mixed_fcv.js&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1412130">SERVER-49544</key>
            <summary>Config server should send setFCV to all shards in parallel</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-cluster-scalability">Backlog - Cluster Scalability</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                    </labels>
                <created>Thu, 16 Jul 2020 14:37:01 +0000</created>
                <updated>Tue, 12 Dec 2023 15:45:15 +0000</updated>
                                            <version>4.5.1</version>
                                                    <component>Sharding</component>
                                        <votes>2</votes>
                                    <watches>25</watches>
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