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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-58664] Simplify and comment autoSplitVector</title>
                <link>https://jira.mongodb.org/browse/SERVER-58664</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;With the work done under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58650&quot; title=&quot;Extract splitVector logic for the auto splitter into a new function&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58650&quot;&gt;&lt;del&gt;SERVER-58650&lt;/del&gt;&lt;/a&gt; , a part of the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/8fd4cd2c997692e3d40afad84064203d71a3127f/src/mongo/db/s/split_vector.cpp#L61&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;splitVector&lt;/a&gt; code - used by the chunk splitter - has been mechanically ported into the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/8fd4cd2c997692e3d40afad84064203d71a3127f/src/mongo/db/s/auto_split_vector.cpp#L61&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;autoSplitVector&lt;/a&gt; without much context.&lt;/p&gt;

&lt;p&gt;As a precondition to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55028&quot; title=&quot;Improve the auto-splitter policy&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-55028&quot;&gt;&lt;del&gt;SERVER-55028&lt;/del&gt;&lt;/a&gt; that is aimed to improve such function, it is recommendable to further simplify/clarify the auto split vector code.&lt;/p&gt;

&lt;p&gt;Planned refactoring:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Extract the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/8fd4cd2c997692e3d40afad84064203d71a3127f/src/mongo/db/s/auto_split_vector.cpp#L85-L95&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;logic to extend the chunk bounds&lt;/a&gt; into an independent function&lt;/li&gt;
	&lt;li&gt;Extract the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/8fd4cd2c997692e3d40afad84064203d71a3127f/src/mongo/db/s/auto_split_vector.cpp#L146-L176&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;minKey == maxKey check&lt;/a&gt; into an independent function&lt;/li&gt;
	&lt;li&gt;Bring out of from the collection lock scope the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/8fd4cd2c997692e3d40afad84064203d71a3127f/src/mongo/db/s/auto_split_vector.cpp#L237-L256&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;code that doesn&apos;t require it&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;Avoid the confusing part &lt;a href=&quot;https://github.com/mongodb/mongo/blob/8fd4cd2c997692e3d40afad84064203d71a3127f/src/mongo/db/s/auto_split_vector.cpp#L182-L245&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;adding/removing minKey to the split vector&lt;/a&gt;, but rather simply keep the last split point reference initialized to the first chunk&apos;s key&lt;/li&gt;
	&lt;li&gt;Better document each unintuitive step/statement&lt;/li&gt;
	&lt;li&gt;Simplify code but preserve the original semantic&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1823868">SERVER-58664</key>
            <summary>Simplify and comment autoSplitVector</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="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                            <label>PM-2321-Chunk-Splitter</label>
                    </labels>
                <created>Mon, 19 Jul 2021 15:28:45 +0000</created>
                <updated>Sun, 29 Oct 2023 21:50:42 +0000</updated>
                            <resolved>Thu, 22 Jul 2021 09:15:29 +0000</resolved>
                                                    <fixVersion>5.1.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="4107814" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 18:37:03 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="3956941" author="xgen-internal-githook" created="Thu, 22 Jul 2021 09:08:04 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Pierlauro Sciarelli&apos;, &apos;email&apos;: &apos;pierlauro.sciarelli@mongodb.com&apos;, &apos;username&apos;: &apos;pierlauro&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58664&quot; title=&quot;Simplify and comment autoSplitVector&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58664&quot;&gt;&lt;del&gt;SERVER-58664&lt;/del&gt;&lt;/a&gt; Simplify and comment autoSplitVector&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1f4dd25739c182d7528847dd3303598a751d1390&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1f4dd25739c182d7528847dd3303598a751d1390&lt;/a&gt;&lt;/p&gt;</comment>
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