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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-24721] Make BalancerPolicy::balance return more than one migration per collection (if appropriate)</title>
                <link>https://jira.mongodb.org/browse/SERVER-24721</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, the &lt;tt&gt;BalancerPolicy::balance&lt;/tt&gt; call, which is used by the sharding balancer returns a single migration per collection. In order to better utilize the ability to move multiple chunks in parallel across the cluster, this call should be made to return more than one migration per collection if this is appropriate.&lt;/p&gt;

&lt;p&gt;For example:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Starting state of S1 (50 chunks), S2 (50 chunks), S3 (0 chunks), S4 (0 chunks) should result in two migrations:&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;S1 -&amp;gt; S3 and S2 -&amp;gt; S4&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Care should be taken that the balancer does not move chunks over-zealously and cause unnecessary churn in the cluster.&lt;/p&gt;</description>
                <environment></environment>
        <key id="295844">SERVER-24721</key>
            <summary>Make BalancerPolicy::balance return more than one migration per collection (if appropriate)</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="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Wed, 22 Jun 2016 15:43:10 +0000</created>
                <updated>Tue, 19 Jul 2016 17:04:01 +0000</updated>
                            <resolved>Thu, 14 Jul 2016 12:46:41 +0000</resolved>
                                                    <fixVersion>3.3.10</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1326343" author="xgen-internal-githook" created="Sun, 17 Jul 2016 16:08:21 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &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; Use explicit std::set contructor&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c4f55991f8be792f95d58ece57fca61e6890befd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c4f55991f8be792f95d58ece57fca61e6890befd&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1323842" author="xgen-internal-githook" created="Thu, 14 Jul 2016 12:41:40 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &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; BalancerPolicy should return more than one migration per collection&lt;/p&gt;

&lt;p&gt;This change makes the BalancerPolicy return multiple migrations per&lt;br/&gt;
collection, if applicable and if they are for different shards.&lt;/p&gt;

&lt;p&gt;These migrations are still executed serially.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/600997a753d1c5b2d2678f615fc1338ab18fc685&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/600997a753d1c5b2d2678f615fc1338ab18fc685&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1323525" author="xgen-internal-githook" created="Thu, 14 Jul 2016 01:41:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &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; Move ShardStatistics vector out of DistributionStatus&lt;/p&gt;

&lt;p&gt;The collection DistributionStatus class shouldn&apos;t contain information&lt;br/&gt;
about the shards since it is not using it. Also cleans up the&lt;br/&gt;
DistributionStatus class so it is more of a cache of the cluster runtime&lt;br/&gt;
state.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4da91b20ca36982b5b86cfb88081353f6adf56a9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4da91b20ca36982b5b86cfb88081353f6adf56a9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1321823" author="xgen-internal-githook" created="Tue, 12 Jul 2016 19:21:37 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &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; Make DistributionStatus include the collection namespace&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d6bc531aeeaacfaa2e21ddcd3a3de187e143a3ad&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d6bc531aeeaacfaa2e21ddcd3a3de187e143a3ad&lt;/a&gt;&lt;/p&gt;</comment>
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