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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-21441] Optimize shard targeting for equality queries on the shard key</title>
                <link>https://jira.mongodb.org/browse/SERVER-21441</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The shard targeting process is fairly heavy-weight. It involves running all query planning logic using QueryPlanner::plan(), and then analyzing the plan to determine the shard key ranges represented by the query.&lt;/p&gt;

&lt;p&gt;For the special case of equality on the shard key, we don&apos;t have to plan the entire query. Instead, we can simply extract the shard key value from the query, look up the corresponding chunk, and determine the shard on which that chunk resides. Performance testing has shown an overall performance benefit of 6-7% associated with this change for equality-on-shardkey queries.&lt;/p&gt;</description>
                <environment></environment>
        <key id="239182">SERVER-21441</key>
            <summary>Optimize shard targeting for equality queries on the shard key</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="9">Done</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Thu, 12 Nov 2015 23:49:53 +0000</created>
                <updated>Wed, 25 Nov 2015 00:27:00 +0000</updated>
                            <resolved>Tue, 17 Nov 2015 18:06:35 +0000</resolved>
                                                    <fixVersion>3.2.0-rc4</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="1090760" author="xgen-internal-githook" created="Tue, 17 Nov 2015 18:05:37 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21441&quot; title=&quot;Optimize shard targeting for equality queries on the shard key&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21441&quot;&gt;&lt;del&gt;SERVER-21441&lt;/del&gt;&lt;/a&gt; faster shard targeting for equality queries on the shard key&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8c0443a33249b3aec2f94fc97017e1314ef3d53f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8c0443a33249b3aec2f94fc97017e1314ef3d53f&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="231248">SERVER-20596</issuekey>
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