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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-67346] Disable autosplit on config.system.sessions when upgrading the cluster to avoid crashes on shard primaries</title>
                <link>https://jira.mongodb.org/browse/SERVER-67346</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Up until v6.0, the chunk splitter is hitting &lt;a href=&quot;https://github.com/mongodb/mongo/blob/fa24cc60109b36ad0c8f6f8fcce78f93156e7dbb/src/mongo/db/s/chunk_splitter.cpp#L339&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;an invariant&lt;/a&gt; in case the configured chunk size for a collection is below 1MB. With the changes committed under &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;, the session collection default chunk size has been decreased to 200KB. Purpose of this ticket is to disable auto-split for the sessions collection in order to avoid hitting the invariant when upgrading to a version with the &quot;no more auto splitter&quot; feature flag active. This is safe because when upgrading, data-size aware balancing will start hence the auto-splitter can be safely disabled.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2071254">SERVER-67346</key>
            <summary>Disable autosplit on config.system.sessions when upgrading the cluster to avoid crashes on shard primaries</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="paolo.polato@mongodb.com">Paolo Polato</reporter>
                        <labels>
                    </labels>
                <created>Fri, 17 Jun 2022 08:56:59 +0000</created>
                <updated>Sun, 29 Oct 2023 21:36:44 +0000</updated>
                            <resolved>Mon, 20 Jun 2022 08:15:43 +0000</resolved>
                                                    <fixVersion>6.0.3</fixVersion>
                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4903357" author="xgen-internal-githook" created="Fri, 14 Oct 2022 13:35:12 +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-67346&quot; title=&quot;Disable autosplit on config.system.sessions when upgrading the cluster to avoid crashes on shard primaries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-67346&quot;&gt;&lt;del&gt;SERVER-67346&lt;/del&gt;&lt;/a&gt; Disable autosplit on config.system.sessions when upgrading the cluster&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ceeb5b9847174009b8a6ea478ae6a8f3bd6eec40&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ceeb5b9847174009b8a6ea478ae6a8f3bd6eec40&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4626455" author="xgen-internal-githook" created="Mon, 20 Jun 2022 08:14:49 +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-67346&quot; title=&quot;Disable autosplit on config.system.sessions when upgrading the cluster to avoid crashes on shard primaries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-67346&quot;&gt;&lt;del&gt;SERVER-67346&lt;/del&gt;&lt;/a&gt; Disable autosplit on config.system.sessions when upgrading the cluster to 6.1&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b06eb97f6f440a52010eef40f1da7af5fa3a2a0f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b06eb97f6f440a52010eef40f1da7af5fa3a2a0f&lt;/a&gt;&lt;/p&gt;</comment>
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