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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-9332] Mongos should re-write $in queries on the shard key before sending them to the shards so that the shards only receive the relevant portion of the $in</title>
                <link>https://jira.mongodb.org/browse/SERVER-9332</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In a sharded environment, a query like&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{_id : {$in : [100, 200, 300, 400, 500, 600...]}}&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;should be re-written by mongos by first resolving each _id value to the containing shard then sending the corresponding sub-qery to the right shard (assuming that _id is the shard key).&lt;/p&gt;

&lt;p&gt;For example, if 100, 300, 500 belong to shard1 and 200, 400, 600 belong to shard2 MongoS should make exactly 2 queries:&lt;/p&gt;
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;{_id : {$in : [100, 300, 500]}}&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;to shard1&lt;br/&gt;
and&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{_id : {$in : [200, 400, 600]}}&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;to shard2.&lt;/p&gt;</description>
                <environment></environment>
        <key id="71539">SERVER-9332</key>
            <summary>Mongos should re-write $in queries on the shard key before sending them to the shards so that the shards only receive the relevant portion of the $in</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                            <label>graphquery</label>
                    </labels>
                <created>Thu, 11 Apr 2013 19:25:00 +0000</created>
                <updated>Tue, 6 Dec 2022 05:22:05 +0000</updated>
                            <resolved>Fri, 10 Nov 2017 15:45:39 +0000</resolved>
                                                                    <component>Index Maintenance</component>
                    <component>Sharding</component>
                                        <votes>10</votes>
                                    <watches>19</watches>
                                                                                                                <comments>
                            <comment id="1665437" author="asya" created="Wed, 6 Sep 2017 14:27:31 +0000"  >&lt;p&gt;This looks like a duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1007&quot; title=&quot;rewrite $in queries on shard key to only include keys on each shard&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1007&quot;&gt;SERVER-1007&lt;/a&gt;&lt;/p&gt;</comment>
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