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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-64425] Unify shard key index logic</title>
                <link>https://jira.mongodb.org/browse/SERVER-64425</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There are currently 2 places that decides which index can be used as the shard key index. This ticket is to figure out if they can be refactored into a one place that makes these decisions.&lt;/p&gt;

&lt;p&gt;The 2 places:&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/blob/1e2a94cd7396709295f615de0437d854d72e54cd/src/mongo/db/catalog/index_catalog_impl.cpp#L1378&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/1e2a94cd7396709295f615de0437d854d72e54cd/src/mongo/db/catalog/index_catalog_impl.cpp#L1378&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/blob/d589fdc86a615409f4fd85e2d73bbd48398753de/src/mongo/db/s/shard_key_util.cpp#L105&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/d589fdc86a615409f4fd85e2d73bbd48398753de/src/mongo/db/s/shard_key_util.cpp#L105&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1999085">SERVER-64425</key>
            <summary>Unify shard key index logic</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="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="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                    </labels>
                <created>Thu, 10 Mar 2022 21:40:08 +0000</created>
                <updated>Tue, 12 Dec 2023 15:44:55 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4406822" author="jack.mulrow" created="Fri, 11 Mar 2022 16:18:15 +0000"  >&lt;p&gt;To give some more context, these two places check for slightly different things and when shardCollection/refineCollectionShardKey check for a compatible shard key index they actually run both of these.&lt;/p&gt;

&lt;p&gt;The shard_key_util.cpp logic runs a listIndexes command, which returns most of the info to know if a shard key index is valid, but notably not if a candidate index is multi key, which is only checked for by the index_catalog_impl.cpp logic, which is accessed by shardCollection/refineCollectionShardKey &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1e2a94cd7396709295f615de0437d854d72e54cd/src/mongo/db/s/shard_key_util.cpp#L262-L266&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;by running the &lt;tt&gt;checkShardingIndex&lt;/tt&gt; command&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;So to remove one of these, we&apos;d have to consolidate the behaviors, possibly by adding multi key info to listIndexes output or changing shard_key_util.cpp to only run checkShardingIndex.&lt;/p&gt;</comment>
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