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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-42282] Consider replacing CommandOnShardedViewNotSupportedOnMongod mechanism with rewrite / routing from shard</title>
                <link>https://jira.mongodb.org/browse/SERVER-42282</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When a read against a non-materialized view is performed in a sharded cluster, the read is first sent to the primary shard for the database, which then looks up the view definition and returns to mongos as part of a CommandOnShardedViewNotSupportedOnMongod error response. We could consider instead performing the rewrite locally on the primary shard and then performing shard to shard routing. This would save us a network hop from the primary shard back to mongos.&lt;/p&gt;</description>
                <environment></environment>
        <key id="860952">SERVER-42282</key>
            <summary>Consider replacing CommandOnShardedViewNotSupportedOnMongod mechanism with rewrite / routing from shard</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-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="james.wahlin@mongodb.com">James Wahlin</reporter>
                        <labels>
                            <label>read-only-views</label>
                    </labels>
                <created>Thu, 18 Jul 2019 19:48:15 +0000</created>
                <updated>Mon, 20 Mar 2023 19:23:10 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4113052" author="JIRAUSER1257467" created="Fri, 8 Oct 2021 15:21:56 +0000"  >&lt;p&gt;Paasing this over to QO since this seems more of a Distributed Planning issues and it a bit big piece for Quick win&lt;/p&gt;</comment>
                            <comment id="3230550" author="james.wahlin@10gen.com" created="Tue, 30 Jun 2020 16:58:10 +0000"  >&lt;p&gt;With the resolution of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32198&quot; title=&quot;Missing collection metadata on the shard implies both UNSHARDED and &amp;quot;metadata not loaded yet&amp;quot;&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32198&quot;&gt;&lt;del&gt;SERVER-32198&lt;/del&gt;&lt;/a&gt;, we are now in a position to tell on a shard whether a collection is sharded, unsharded, or whether we are not sure. If we decide not to do the work scope for this ticket in Q3, we may want to consider instead a change to allow a cluster view read, where the underlying collection is unsharded, to be resolved and executed on the primary shard without having to kickback to mongos. &lt;/p&gt;</comment>
                            <comment id="2914562" author="charlie.swanson" created="Thu, 27 Feb 2020 16:41:58 +0000"  >&lt;p&gt;Flagging for re-triage. The new mechanisms we built to support $unionWith running on a shard may allow us to do this relatively easily. I&apos;d recommend considering this as a quick win.&lt;/p&gt;</comment>
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            <issuekey id="2033023">SERVER-65949</issuekey>
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            <issuekey id="1398544">SERVER-49228</issuekey>
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