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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-50299] Shard Targeting for $in statements</title>
                <link>https://jira.mongodb.org/browse/SERVER-50299</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;HI&#160;&lt;/p&gt;

&lt;p&gt;Working with a Client we were exploring ways to mitigate load issues on the mongod hosts on a Sharded cluster.&#160;&lt;/p&gt;

&lt;p&gt;The particular client is doing multiple $in statements in each query but have large lists for up to 1000 entries per $in part.&#160; Based on testing on both Our and the client side we were able to see significant advantages of trying to target each $in&apos;s entries to a single shard. Thus avoiding scatter gather queries foe each fo the $in queries.&lt;/p&gt;

&lt;p&gt;The optimisation could be both on the mongos or on the driver side, and on the dirver and could make it invisible to the client.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1385949">SERVER-50299</key>
            <summary>Shard Targeting for $in statements</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>
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                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="max.hirschhorn@mongodb.com">Max Hirschhorn</assignee>
                                    <reporter username="dawid.esterhuizen@mongodb.com">Dawid Esterhuizen</reporter>
                        <labels>
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                <created>Mon, 22 Jun 2020 16:41:52 +0000</created>
                <updated>Thu, 27 Aug 2020 15:53:02 +0000</updated>
                            <resolved>Thu, 27 Aug 2020 15:53:02 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="3337224" author="garaudy.etienne" created="Thu, 13 Aug 2020 16:03:46 +0000"  >&lt;p&gt;What exactly does &quot;mitigate load issues&quot; mean here?&lt;/p&gt;</comment>
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