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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-47112] Improve setFeatureCompatibilityVersion 4.2 impact with many tables</title>
                <link>https://jira.mongodb.org/browse/SERVER-47112</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When a primary executes setFCV(&quot;4.2&quot;) its main work is to upgrade all its unique indexes to a new format (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32825&quot; title=&quot;Add the infrastructure for upgrade/downgrade of V2Unique indexes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32825&quot;&gt;&lt;del&gt;SERVER-32825&lt;/del&gt;&lt;/a&gt;). It writes a collMod oplog entry per collection to trigger the secondaries to upgrade their unique indexes too. &lt;/p&gt;

&lt;p&gt;When mongos executes setFCV, it &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/s/commands/cluster_set_feature_compatibility_version_cmd.cpp#L103&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;sends it to the primary of the config replica set&lt;/a&gt;, which sends it to the primary of each shard, and waits for majority acknowledgement. &lt;/p&gt;
</description>
                <environment></environment>
        <key id="1290108">SERVER-47112</key>
            <summary>Improve setFeatureCompatibilityVersion 4.2 impact with many tables</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="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-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="dmitry.agranat@mongodb.com">Dmitry Agranat</reporter>
                        <labels>
                    </labels>
                <created>Wed, 25 Mar 2020 14:18:58 +0000</created>
                <updated>Tue, 6 Dec 2022 02:31:52 +0000</updated>
                                                                            <component>Replication</component>
                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>18</watches>
                                                                                                                <comments>
                            <comment id="3003040" author="connie.chen" created="Thu, 26 Mar 2020 19:39:01 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=rachelle.palmer&quot; class=&quot;user-hover&quot; rel=&quot;rachelle.palmer&quot;&gt;rachelle.palmer&lt;/a&gt; will review to determine priority/what the acceptable impact should be?&lt;/p&gt;</comment>
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