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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-49228] Remove kickback to mongos requirement for cluster view read when view is backed by unsharded collection</title>
                <link>https://jira.mongodb.org/browse/SERVER-49228</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently when a read is performed against a view backed by an unsharded collection, the following takes place:&lt;br/&gt;
1) mongos sends the read to the primary shard for the given database&lt;br/&gt;
2) The primary shard determines that namespace is a view, and returns the view definition and underlying namespace to mongos&lt;br/&gt;
3) mongos rewrites the read on the view to be an aggregate command against the underlying collection, with the view definition incorporated into the aggregation pipeline&lt;br/&gt;
4) mongos executes the aggregate command&lt;/p&gt;

&lt;p&gt;When the view is backed by an unsharded collection we would ideally perform the rewrite on the primary shard and execute locally rather than return the view definition to mongos for rewrite/execution. This was previously not possible, as the primary shard could incorrectly report that a sharded collection was unsharded. With the completion 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; however we can now definitively know whether a collection&apos;s sharding state is sharded, unsharded or unknown. In the case where we know it is unsharded, we can execute the view on the read remotely, without mongos kick-back.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1398544">SERVER-49228</key>
            <summary>Remove kickback to mongos requirement for cluster view read when view is backed by unsharded collection</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="james.wahlin@mongodb.com">James Wahlin</assignee>
                                    <reporter username="james.wahlin@mongodb.com">James Wahlin</reporter>
                        <labels>
                            <label>neweng</label>
                            <label>qopt-team</label>
                    </labels>
                <created>Wed, 1 Jul 2020 13:17:16 +0000</created>
                <updated>Sun, 29 Oct 2023 22:06:15 +0000</updated>
                            <resolved>Mon, 8 Mar 2021 14:26:25 +0000</resolved>
                                    <version>4.4.0-rc11</version>
                                    <fixVersion>4.9.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3650350" author="xgen-internal-githook" created="Fri, 5 Mar 2021 22:01:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;James Wahlin&apos;, &apos;email&apos;: &apos;james@mongodb.com&apos;, &apos;username&apos;: &apos;jameswahlin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-49228&quot; title=&quot;Remove kickback to mongos requirement for cluster view read when view is backed by unsharded collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-49228&quot;&gt;&lt;del&gt;SERVER-49228&lt;/del&gt;&lt;/a&gt; Remove kickback to mongos requirement for cluster view read when view is backed by unsharded collection&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a407cf2e8e25aad8762bb379854e10acf17793bd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a407cf2e8e25aad8762bb379854e10acf17793bd&lt;/a&gt;&lt;/p&gt;</comment>
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                <issuelinks>
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                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="1656624">SERVER-55454</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="469026">SERVER-32198</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="860952">SERVER-42282</issuekey>
        </issuelink>
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