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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>[DOCS-11680] [Server] Update Migration Thresholds for MongoDB 3.4 or above</title>
                <link>https://jira.mongodb.org/browse/DOCS-11680</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;Triage notes: it looks like the only doc change is&#160;here:&#160;&lt;a href=&quot;https://docs.mongodb.com/manual/core/sharding-balancer-administration/index.html#migration-thresholds.&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/core/sharding-balancer-administration/index.html#migration-thresholds.&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Also, &quot;migration thresholds&quot; links to itself on this page. Does it make sense to explain this further?&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Document &lt;a href=&quot;https://docs.mongodb.com/manual/core/sharding-balancer-administration/index.html#migration-thresholds&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Migration Thresholds&lt;/a&gt;:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;In MongoDB 3.2 or earlier, the migration thresholds are calculated by difference in number of chunks between the shard with the most chunks for the collection and the shard with the fewest chunks for that collection.&lt;/li&gt;
	&lt;li&gt;However, the migration thresholds have been changed since MongoDB 3.4 in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-24721&quot; title=&quot;Make BalancerPolicy::balance return more than one migration per collection (if appropriate)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-24721&quot;&gt;&lt;del&gt;SERVER-24721&lt;/del&gt;&lt;/a&gt;, and also 4.0 in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35003&quot; title=&quot;Consider making the balancer threshold to always be 1&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35003&quot;&gt;&lt;del&gt;SERVER-35003&lt;/del&gt;&lt;/a&gt;. We&apos;d need to update the document on the migration thresholds for MongoDB 3.4 or above.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="541292">DOCS-11680</key>
            <summary>[Server] Update Migration Thresholds for MongoDB 3.4 or above</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="9">Done</resolution>
                                        <assignee username="lauren.tran@mongodb.com">Lauren Tran</assignee>
                                    <reporter username="linda.qin@mongodb.com">Linda Qin</reporter>
                        <labels>
                            <label>reopened</label>
                            <label>server-docs-bug-bash</label>
                            <label>sharding</label>
                            <label>triage</label>
                    </labels>
                <created>Wed, 9 May 2018 00:45:59 +0000</created>
                <updated>Mon, 8 Jan 2024 17:04:12 +0000</updated>
                            <resolved>Mon, 20 Nov 2023 21:44:38 +0000</resolved>
                                                    <fixVersion>4.4 Required</fixVersion>
                    <fixVersion>5.0 Required</fixVersion>
                    <fixVersion>Server_Docs_[20240108]</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="5871343" author="JIRAUSER1269489" created="Fri, 10 Nov 2023 16:23:06 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=garaudy.etienne%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;garaudy.etienne@mongodb.com&quot;&gt;garaudy.etienne@mongodb.com&lt;/a&gt; it is currently in external review and &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=pierlauro.sciarelli%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;pierlauro.sciarelli@mongodb.com&quot;&gt;pierlauro.sciarelli@mongodb.com&lt;/a&gt; said he will review it next week!&lt;/p&gt;</comment>
                            <comment id="5871268" author="garaudy.etienne" created="Fri, 10 Nov 2023 16:05:19 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=lauren.tran%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;lauren.tran@mongodb.com&quot;&gt;lauren.tran@mongodb.com&lt;/a&gt; did we ever finish this ticket?&lt;/p&gt;</comment>
                            <comment id="5420570" author="JIRAUSER1264464" created="Fri, 12 May 2023 13:51:00 +0000"  >&lt;p&gt;Thanks &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=matt.panton%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;matt.panton@mongodb.com&quot;&gt;matt.panton@mongodb.com&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=pierlauro.sciarelli%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;pierlauro.sciarelli@mongodb.com&quot;&gt;pierlauro.sciarelli@mongodb.com&lt;/a&gt;! Who would be the best person for a technical review once this change is drafted?&lt;/p&gt;</comment>
                            <comment id="4940589" author="edu.bot" created="Mon, 31 Oct 2022 16:07:50 +0000"  >&lt;p&gt;Hello! This ticket has been closed due to inactivity. If you believe this ticket is still important, please reopen it and leave a comment to explain why. Thank you!&lt;/p&gt;</comment>
                            <comment id="2698408" author="renctan" created="Thu, 2 Jan 2020 15:21:36 +0000"  >&lt;p&gt;Was it because they were having more migrations than before? If not, the CPU usage might be caused by something else.&lt;/p&gt;</comment>
                            <comment id="2697354" author="siyuan.zhou@10gen.com" created="Wed, 1 Jan 2020 03:33:06 +0000"  >&lt;p&gt;A user in Chineses community noticed this disparity since they observed the CPU usage of a hash sharded cluster increased from 10% to 40% after upgrading from 3.6 to 4.0. CC &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=renctan&quot; class=&quot;user-hover&quot; rel=&quot;renctan&quot;&gt;renctan&lt;/a&gt;.&lt;/p&gt;</comment>
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