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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-37982] Distinguish two techniques to extract the document key fields within agg</title>
                <link>https://jira.mongodb.org/browse/SERVER-37982</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There are currently two stages which need to look up/determine the document key fields for a collection (shard key plus _id or simply the _id if it&apos;s not sharded): $out and $changeStream. On a shard server, there are two ways we can gather that information: through the CollectionShardingState or through the CatalogCache. The important distinction between these two classes is that CollectionShardingState is meant to be used for a collection which is hosted on the shard itself, whereas CatalogCache is meant to be used when a process is acting as a router. CatalogCache was originally developed and used for mongos. For change streams, we want to use the CollectionShardingState because we know the collection is hosted on this shard (given that we&apos;re transforming an oplog entry for a write to that collection). For $out, we want to use the CatalogCache because we may be performing remote writes and thus acting as a router. This distinction is not currently present and in fact &lt;a href=&quot;https://github.com/mongodb/mongo/blob/514873667fbb5fa62a245a936826bc71f73b87e8/src/mongo/db/pipeline/process_interface_shardsvr.cpp#L76-L132&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;we use both in a very confusing way&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;We should separate the current &lt;a href=&quot;https://github.com/mongodb/mongo/blob/514873667fbb5fa62a245a936826bc71f73b87e8/src/mongo/db/pipeline/mongo_process_interface.h#L227&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;MongoProcessInterface::collectDocumentKeyFields&lt;/a&gt; into two methods, one for each purpose.&lt;/p&gt;</description>
                <environment></environment>
        <key id="630175">SERVER-37982</key>
            <summary>Distinguish two techniques to extract the document key fields within agg</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="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="charlie.swanson@mongodb.com">Charlie Swanson</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                    </labels>
                <created>Wed, 7 Nov 2018 15:21:40 +0000</created>
                <updated>Sun, 29 Oct 2023 22:26:48 +0000</updated>
                            <resolved>Fri, 16 Nov 2018 20:26:38 +0000</resolved>
                                                    <fixVersion>4.1.6</fixVersion>
                                    <component>Aggregation Framework</component>
                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2065136" author="xgen-internal-githook" created="Fri, 16 Nov 2018 20:22:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Charlie Swanson&apos;, &apos;email&apos;: &apos;charlie.swanson@mongodb.com&apos;, &apos;username&apos;: &apos;cswanson310&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37982&quot; title=&quot;Distinguish two techniques to extract the document key fields within agg&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37982&quot;&gt;&lt;del&gt;SERVER-37982&lt;/del&gt;&lt;/a&gt; Distinguish use cases for collecting document key fields&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4a74a41fc5d2014aad3a2b85630f8e2e51156d51&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4a74a41fc5d2014aad3a2b85630f8e2e51156d51&lt;/a&gt;&lt;/p&gt;</comment>
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