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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-43376] Operations on non-sharded views in sharded clusters extra round trip</title>
                <link>https://jira.mongodb.org/browse/SERVER-43376</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It looks like if I have a view on a non-sharded collection, then operations on it (e.g. find, explain) require an extra roundtrip because mongod bounces the first request with an exception that is used by mongos to find out that it&apos;s indeed a view:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2019-09-19T09:20:46.883-0500 D TRACKING [replSetDistLockPinger] Cmd: NotSet, TrackingId: 5d838ebe2a67f139ad45d445&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2019-09-19T09:20:47.647-0500 D TRACKING [Uptime reporter] Cmd: NotSet, TrackingId: 5d838ebf2a67f139ad45d447&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2019-09-19T09:20:48.476-0500 D -        [conn5] User Assertion: CommandOnShardedViewNotSupportedOnMongod{ resolvedView: { ns: &quot;test.test&quot;, pipeline: [], collation: { locale: &quot;simple&quot; } } }: On sharded systems, resolved views must be executed by mongos src/mongo/db/query/cursor_response.h 165&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2019-09-19T09:20:48.479-0500 D TRACKING [conn5] Cmd: find, TrackingId: 5d838ec02a67f139ad45d44c&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2019-09-19T09:20:48.483-0500 I COMMAND  [conn5] command test.view appName: &quot;MongoDB Shell&quot; command: find { find: &quot;view&quot;, filter: { x: 3.0 }, lsid: { id: UUID(&quot;a9e2ff0d-2a78-4a7a-b8d5-16f14ac83375&quot;) }, $clusterTime: { clusterTime: Timestamp(1568902782, 1), signature: { hash: BinData(0, 0000000000000000000000000000000000000000&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;I think this is not necessary for non-sharded collections. &lt;/p&gt;</description>
                <environment></environment>
        <key id="932699">SERVER-43376</key>
            <summary>Operations on non-sharded views in sharded clusters extra round trip</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="13202">Works as Designed</resolution>
                                        <assignee username="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="alex.komyagin@mongodb.com">Alexander Komyagin</reporter>
                        <labels>
                    </labels>
                <created>Thu, 19 Sep 2019 14:25:32 +0000</created>
                <updated>Fri, 27 Oct 2023 13:53:04 +0000</updated>
                            <resolved>Mon, 23 Sep 2019 15:28:59 +0000</resolved>
                                    <version>4.0.12</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="2428245" author="esha.maharishi@10gen.com" created="Mon, 23 Sep 2019 15:28:59 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=alex.komyagin&quot; class=&quot;user-hover&quot; rel=&quot;alex.komyagin&quot;&gt;alex.komyagin&lt;/a&gt; we are aware of this inefficiency but don&apos;t have immediate plans to improve it, so closing as Works as Designed.&lt;/p&gt;</comment>
                            <comment id="2425379" author="renctan" created="Thu, 19 Sep 2019 15:34:10 +0000"  >&lt;p&gt;This was a compromise we made because OSS (OperationShardingState: the thing that keeps track of request&apos;s shard version) supported only 1 namespace. So when the request on view ns1 comes in and resolves to ns2, the shard version checking code could not perform the check the ns2. We may need to also enhance OSS to track more than one ns to enable this&lt;/p&gt;</comment>
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