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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-80596] Avoid useless initial iteration in ChunkMap chunks loops </title>
                <link>https://jira.mongodb.org/browse/SERVER-80596</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/2d00e180a75ab9404fc624c5abe7e9994f317479/src/mongo/s/chunk_manager.cpp#L623&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Here&lt;/a&gt; and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2d00e180a75ab9404fc624c5abe7e9994f317479/src/mongo/s/chunk_manager.h#L159&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here &lt;/a&gt;we use &lt;tt&gt;lower_bound&lt;/tt&gt; instead of &lt;tt&gt;upper_bound&lt;/tt&gt; to find the vector that contain the first chunk of the loop. The consequence is that when the start shard key is equal to the minKey of the first chunk of a vector, we will wrongly start iterating from the previous vector instead of the correct one.&lt;/p&gt;

&lt;p&gt;This does not actually cause any correctness issue because in both cases the logic afterward will simply skip the initial wrong vector because it doesn&apos;t actually contain the initial shard Key.&lt;br/&gt;
In any case, this logic is wrong and should be fixed.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2431246">SERVER-80596</key>
            <summary>Avoid useless initial iteration in ChunkMap chunks loops </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="13201">Fixed</resolution>
                                        <assignee username="tommaso.tocci@mongodb.com">Tommaso Tocci</assignee>
                                    <reporter username="tommaso.tocci@mongodb.com">Tommaso Tocci</reporter>
                        <labels>
                    </labels>
                <created>Thu, 31 Aug 2023 11:29:03 +0000</created>
                <updated>Sun, 29 Oct 2023 21:16:52 +0000</updated>
                            <resolved>Wed, 6 Sep 2023 09:49:48 +0000</resolved>
                                    <version>7.1.0-rc0</version>
                                    <fixVersion>7.2.0-rc0</fixVersion>
                    <fixVersion>7.1.0-rc2</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5683104" author="xgen-internal-githook" created="Wed, 6 Sep 2023 14:01:48 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80596&quot; title=&quot;Avoid useless initial iteration in ChunkMap chunks loops &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80596&quot;&gt;&lt;del&gt;SERVER-80596&lt;/del&gt;&lt;/a&gt; Avoid useless initial iteration in ChunkMap chunks loops&lt;/p&gt;

&lt;p&gt;(cherry picked from commit da03e4fb0c8b00702ca51606b54b39df504fc598)&lt;br/&gt;
Branch: v7.1&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7b1be26457b77ab0f2031b3437442838898ee052&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7b1be26457b77ab0f2031b3437442838898ee052&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5682327" author="xgen-internal-githook" created="Wed, 6 Sep 2023 09:06:27 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80596&quot; title=&quot;Avoid useless initial iteration in ChunkMap chunks loops &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80596&quot;&gt;&lt;del&gt;SERVER-80596&lt;/del&gt;&lt;/a&gt; Avoid useless initial iteration in ChunkMap chunks loops&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/da03e4fb0c8b00702ca51606b54b39df504fc598&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/da03e4fb0c8b00702ca51606b54b39df504fc598&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2195305">SERVER-71627</issuekey>
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