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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-66078] Adapt sessions collection balacing policy to data-size aware balancing</title>
                <link>https://jira.mongodb.org/browse/SERVER-66078</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/30b8ed7e87a4bdf1fbc9e36f3ba7275c71f2eb6c/src/mongo/db/namespace_string.cpp#L65-L66&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;sessions collection&lt;/a&gt; is sharded in order to spread sessions info across different nodes to avoid bottlenecks.&lt;br/&gt;
Sessions load distribution has always happened by balancing the number of chunks across shards; with the introduction of data-size aware balancing, we should find a way to spread documents across shards considering that they are very small (~150/200 bytes in average) and their cumulative size is often much less than the default max chunk size (meaning that if balancing would happen on data size, nothing would be considered eligible to move).&lt;/p&gt;</description>
                <environment></environment>
        <key id="2036297">SERVER-66078</key>
            <summary>Adapt sessions collection balacing policy to data-size aware balancing</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="paolo.polato@mongodb.com">Paolo Polato</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                    </labels>
                <created>Fri, 29 Apr 2022 13:07:36 +0000</created>
                <updated>Sun, 29 Oct 2023 21:38:47 +0000</updated>
                            <resolved>Wed, 1 Jun 2022 14:51:11 +0000</resolved>
                                                    <fixVersion>6.0.3</fixVersion>
                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4903352" author="xgen-internal-githook" created="Fri, 14 Oct 2022 13:35:03 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66078&quot; title=&quot;Adapt sessions collection balacing policy to data-size aware balancing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66078&quot;&gt;&lt;del&gt;SERVER-66078&lt;/del&gt;&lt;/a&gt; Make config.system.sessions balanceable by data size criteria&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e316e3a005dd85ff0eca94e064d08372d90ad972&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e316e3a005dd85ff0eca94e064d08372d90ad972&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4586644" author="xgen-internal-githook" created="Wed, 1 Jun 2022 14:43:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66078&quot; title=&quot;Adapt sessions collection balacing policy to data-size aware balancing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66078&quot;&gt;&lt;del&gt;SERVER-66078&lt;/del&gt;&lt;/a&gt; Make config.system.sessions balanceable by data size criteria&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d47db7491eec3f05df5021793a6a97e6f9f5c7d7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d47db7491eec3f05df5021793a6a97e6f9f5c7d7&lt;/a&gt;&lt;/p&gt;</comment>
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                                                                <inwardlinks description="is documented by">
                                        <issuelink>
            <issuekey id="2424049">DOCS-16339</issuekey>
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            <issuekey id="2209290">SERVER-72065</issuekey>
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            <issuelink>
            <issuekey id="2085560">SERVER-67898</issuekey>
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            <issuelink>
            <issuekey id="2085567">SERVER-67899</issuekey>
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            <issuekey id="1101563">SERVER-45624</issuekey>
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                            <customfieldvalue>The documentation currently states:&lt;br/&gt;
```&lt;br/&gt;
Starting in version 4.4 (and 4.2.7), MongoDB automatically splits the system.sessions collection into at least 1024 chunks and distributes the chunks uniformly across shards in the cluster.&lt;br/&gt;
```&lt;br/&gt;
&lt;br/&gt;
In the DOCS starting from v6.0, this snippet should be removed.</customfieldvalue>

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