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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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            <title>[SERVER-59957] Add NamespaceString::isPerShardNamespace method</title>
                <link>https://jira.mongodb.org/browse/SERVER-59957</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When attempting to perform an internal read, we typically use our pipeline-building API to create a pipeline and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/dbc183a9bdb2656b01134e3bd068b0e0e25d568d/src/mongo/db/pipeline/sharded_agg_helpers.cpp#L1269&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;attach a cursor source here&lt;/a&gt;, which can be either a local cursor (when running on a replica set) or a cursor which we establish via a sharded network request (when running on a shard). However, there are certain cases where the namespace we are attempting to read from is shard-local - that is, the collection exists independently on each shard - and attempting to attach a cursor source ends up incorrectly issuing a request to the remote primary shard instead, because the sharding infrastructure reports the collection as being unsharded. This has lead us to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/dbc183a9bdb2656b01134e3bd068b0e0e25d568d/src/mongo/db/pipeline/sharded_agg_helpers.cpp#L1284-L1285&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;create an increasing list of exceptions for different internal namespaces&lt;/a&gt; as each such use-case is encountered, and in other cases &lt;a href=&quot;https://github.com/mongodb/mongo/blob/dbc183a9bdb2656b01134e3bd068b0e0e25d568d/src/mongo/db/pipeline/process_interface/shardsvr_process_interface.cpp#L133-L135&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;to use &lt;tt&gt;NamespaceString::isNamespaceAlwaysUnsharded&lt;/tt&gt;&lt;/a&gt; as an imperfect approximation of a check for shard-local collections.&lt;/p&gt;

&lt;p&gt;We should add a new helper method &lt;tt&gt;NamespaceString::isPerShardNamespace&lt;/tt&gt; or &lt;tt&gt;isShardLocalNamespace&lt;/tt&gt; so that we can easily determine whether a given namespace is expected to exist independently on each shard, or whether we must issue a remote request to access it.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1874178">SERVER-59957</key>
            <summary>Add NamespaceString::isPerShardNamespace method</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-catalog-and-routing">Backlog - Catalog and Routing</assignee>
                                    <reporter username="bernard.gorman@mongodb.com">Bernard Gorman</reporter>
                        <labels>
                            <label>PM-2144-Milestone-0</label>
                            <label>oldshardingemea</label>
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                <created>Tue, 14 Sep 2021 21:13:16 +0000</created>
                <updated>Thu, 26 Oct 2023 10:10:51 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>2</watches>
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            <issuekey id="1869966">SERVER-59839</issuekey>
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