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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-78657] Get rid of `getSplitCandidatesForSessionsCollection` and `minNumChunksForSessionsCollection`</title>
                <link>https://jira.mongodb.org/browse/SERVER-78657</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Starting from v6.0, the balancer is distributing data based on the data size on shards and not merely on the number of chunks. Because of that, it is totally useless to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a897690f1a192921fa8ddfdd002ed2513af14275/src/mongo/db/s/balancer/balancer_chunk_selection_policy.cpp#L338&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;presplit the session collection&lt;/a&gt; during balancing rounds and it&apos;s also counterproductive because (1) chunks will not be moved and (2) starting from v7.0 the auto merger will squash them back together.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2383398">SERVER-78657</key>
            <summary>Get rid of `getSplitCandidatesForSessionsCollection` and `minNumChunksForSessionsCollection`</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="pol.pinol@mongodb.com">Pol Pinol</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                            <label>shardingemea-qw</label>
                    </labels>
                <created>Tue, 4 Jul 2023 14:35:57 +0000</created>
                <updated>Sun, 29 Oct 2023 21:19:15 +0000</updated>
                            <resolved>Thu, 24 Aug 2023 08:31:35 +0000</resolved>
                                    <version>6.0.7</version>
                    <version>7.0.0-rc6</version>
                                    <fixVersion>7.1.0-rc0</fixVersion>
                    <fixVersion>7.0.2</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5658825" author="xgen-internal-githook" created="Fri, 25 Aug 2023 11:08:53 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Pol Pinol Castuera&apos;, &apos;email&apos;: &apos;pol.pinol@mongodb.com&apos;, &apos;username&apos;: &apos;PolPinol&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-78657&quot; title=&quot;Get rid of `getSplitCandidatesForSessionsCollection` and `minNumChunksForSessionsCollection`&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-78657&quot;&gt;&lt;del&gt;SERVER-78657&lt;/del&gt;&lt;/a&gt; Get rid of `getSplitCandidatesForSessionsCollection` and `minNumChunksForSessionsCollection`&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 2d340534b1acce98965b7ef9ccc96f3a73c3a86e)&lt;br/&gt;
Branch: v7.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/579d9319198d67dbd70de792fd4e7bf9d08b4205&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/579d9319198d67dbd70de792fd4e7bf9d08b4205&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5655538" author="xgen-internal-githook" created="Thu, 24 Aug 2023 08:25:43 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Pol Pinol Castuera&apos;, &apos;email&apos;: &apos;pol.pinol@mongodb.com&apos;, &apos;username&apos;: &apos;PolPinol&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-78657&quot; title=&quot;Get rid of `getSplitCandidatesForSessionsCollection` and `minNumChunksForSessionsCollection`&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-78657&quot;&gt;&lt;del&gt;SERVER-78657&lt;/del&gt;&lt;/a&gt; Get rid of `getSplitCandidatesForSessionsCollection` and `minNumChunksForSessionsCollection`&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2d340534b1acce98965b7ef9ccc96f3a73c3a86e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2d340534b1acce98965b7ef9ccc96f3a73c3a86e&lt;/a&gt;&lt;/p&gt;</comment>
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                            <customfieldvalue>We are marking as deprecated the server parameter `minNumChunksForSessionsCollection`. It will be ignored internally.&lt;br/&gt;
&lt;br/&gt;
It should be worth documenting this for the user, so in the future this server parameter could be internally removed. The problem is that `minNumChunksForSessionsCollection` has never been documented externally, and it makes no sense to do it from now.&lt;br/&gt;
&lt;br/&gt;
I propose introducing a section called &amp;quot;parameter ignored/DEPRECATED&amp;quot; or similar in the docs and expose the `minNumChunksForSessionsCollection` there, with the possibility to extend this list in the future.</customfieldvalue>

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