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    <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-77918] Make monotonicity calculation in analyzeShardKey command avoid unnecessary shard key extraction and comparison</title>
                <link>https://jira.mongodb.org/browse/SERVER-77918</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The check involves scanning the supporting index to get the &lt;a href=&quot;https://github.com/10gen/mongo/blob/468d51cf75af686832154241611fee8de8a7dfbb/src/mongo/db/s/analyze_shard_key_cmd_util.cpp#L582&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;recordIds&lt;/a&gt; and checking that shard key isn&apos;t &lt;a href=&quot;https://github.com/10gen/mongo/blob/468d51cf75af686832154241611fee8de8a7dfbb/src/mongo/db/s/analyze_shard_key_cmd_util.cpp#L626-L630&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;constant&lt;/a&gt;. The latter can be done without &lt;a href=&quot;https://github.com/10gen/mongo/blob/468d51cf75af686832154241611fee8de8a7dfbb/src/mongo/db/s/analyze_shard_key_cmd_util.cpp#L599-L604&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;extracting the shard key value from every index key value and compare every pair of pervious and current value&lt;/a&gt;, i.e. we can skip extracting and comparing as long as more than one shard key value has been seen. The check was only necessary back when we use to &lt;a href=&quot;https://github.com/mongodb/mongo/commit/a56ab1d23fb4d14da3ece21570fc77f443aae608#diff-60e1debfedc5eeb68b397e7569c75a65834aee9660d5ccba79f8010c9d7dcbc9L478-L479&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;exclude recordIds with the same shard key value&lt;/a&gt; from the correlation coefficient calculation in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74772&quot; title=&quot;Make analyzeShardKey command include all records in the monotonicity check&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74772&quot;&gt;&lt;del&gt;SERVER-74772&lt;/del&gt;&lt;/a&gt;. Skipping this might significantly reduce the latency of the monotonicity check.&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2362580">SERVER-77918</key>
            <summary>Make monotonicity calculation in analyzeShardKey command avoid unnecessary shard key extraction and comparison</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="cheahuychou.mao@mongodb.com">Cheahuychou Mao</assignee>
                                    <reporter username="cheahuychou.mao@mongodb.com">Cheahuychou Mao</reporter>
                        <labels>
                    </labels>
                <created>Thu, 8 Jun 2023 15:14:15 +0000</created>
                <updated>Sun, 29 Oct 2023 21:20:19 +0000</updated>
                            <resolved>Wed, 14 Jun 2023 14:28:21 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                    <fixVersion>7.0.0-rc5</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5503863" author="xgen-internal-githook" created="Fri, 16 Jun 2023 02:22:40 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Cheahuychou Mao&apos;, &apos;email&apos;: &apos;mao.cheahuychou@gmail.com&apos;, &apos;username&apos;: &apos;cheahuychou&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-77918&quot; title=&quot;Make monotonicity calculation in analyzeShardKey command avoid unnecessary shard key extraction and comparison&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-77918&quot;&gt;&lt;del&gt;SERVER-77918&lt;/del&gt;&lt;/a&gt; Make monotonicity calculation in analyzeShardKey command avoid unnecessary shard key extraction and comparison&lt;/p&gt;

&lt;p&gt;(cherry picked from commit cf00278a5230148eaf71c04df84f6c6de77decee)&lt;br/&gt;
Branch: v7.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2b52a6c3cf6995c1b11632f04186c16d65bf6ed0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2b52a6c3cf6995c1b11632f04186c16d65bf6ed0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5498506" author="xgen-internal-githook" created="Wed, 14 Jun 2023 14:12:15 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Cheahuychou Mao&apos;, &apos;email&apos;: &apos;mao.cheahuychou@gmail.com&apos;, &apos;username&apos;: &apos;cheahuychou&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-77918&quot; title=&quot;Make monotonicity calculation in analyzeShardKey command avoid unnecessary shard key extraction and comparison&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-77918&quot;&gt;&lt;del&gt;SERVER-77918&lt;/del&gt;&lt;/a&gt; Make monotonicity calculation in analyzeShardKey command avoid unnecessary shard key extraction and comparison&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cf00278a5230148eaf71c04df84f6c6de77decee&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cf00278a5230148eaf71c04df84f6c6de77decee&lt;/a&gt;&lt;/p&gt;</comment>
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