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    <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-71009] Make sure the select chunks operation doesn&apos;t take too long</title>
                <link>https://jira.mongodb.org/browse/SERVER-71009</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;On every balancer round, the balancer iterates over all the sharded collections stopping when all shards are already involved in one migration (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-70973&quot; title=&quot;Balancer should stop iterating collections when there are no more available shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-70973&quot;&gt;&lt;del&gt;SERVER-70973&lt;/del&gt;&lt;/a&gt;).&lt;br/&gt;
However, the balancer can still exceed the 1 sec defined interval time between rounds (&lt;a href=&quot;https://github.com/10gen/mongo/blob/6faa57abb9c9c466531ee008904989ca0cc3b4f4/src/mongo/db/s/balancer/balancer.cpp#L89&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;kBalancerMigrationsThrottling&lt;/a&gt;) in the following scenarios:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;The number of sharded collections is very high and it&apos;s not possible to involve all shards in a migration.&lt;/li&gt;
	&lt;li&gt;The number of sharded collections is very high and just a few of them are imbalanced.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="2172740">SERVER-71009</key>
            <summary>Make sure the select chunks operation doesn&apos;t take too long</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="silvia.surroca@mongodb.com">Silvia Surroca</assignee>
                                    <reporter username="silvia.surroca@mongodb.com">Silvia Surroca</reporter>
                        <labels>
                            <label>balancer-perf-improvement</label>
                    </labels>
                <created>Wed, 2 Nov 2022 09:38:27 +0000</created>
                <updated>Sun, 29 Oct 2023 21:31:11 +0000</updated>
                            <resolved>Wed, 12 Apr 2023 13:55:43 +0000</resolved>
                                                    <fixVersion>7.0.0-rc0</fixVersion>
                    <fixVersion>7.1.0-rc0</fixVersion>
                    <fixVersion>6.0.6</fixVersion>
                    <fixVersion>6.3.2</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5370737" author="xgen-internal-githook" created="Mon, 24 Apr 2023 15:15:38 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Silvia Surroca&apos;, &apos;email&apos;: &apos;silvia.surroca@mongodb.com&apos;, &apos;username&apos;: &apos;silviasuhu&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-71009&quot; title=&quot;Make sure the select chunks operation doesn&amp;#39;t take too long&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-71009&quot;&gt;&lt;del&gt;SERVER-71009&lt;/del&gt;&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76172&quot; title=&quot;Fix BalancerChunkSelection unit test on slow build variants&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76172&quot;&gt;&lt;del&gt;SERVER-76172&lt;/del&gt;&lt;/a&gt; Limit the select chunks operation time&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3c9b92a1890de2fac294e1e8d4829f986fba9337&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3c9b92a1890de2fac294e1e8d4829f986fba9337&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5362311" author="xgen-internal-githook" created="Thu, 20 Apr 2023 13:36:27 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Silvia Surroca&apos;, &apos;email&apos;: &apos;silvia.surroca@mongodb.com&apos;, &apos;username&apos;: &apos;silviasuhu&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-71009&quot; title=&quot;Make sure the select chunks operation doesn&amp;#39;t take too long&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-71009&quot;&gt;&lt;del&gt;SERVER-71009&lt;/del&gt;&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76172&quot; title=&quot;Fix BalancerChunkSelection unit test on slow build variants&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76172&quot;&gt;&lt;del&gt;SERVER-76172&lt;/del&gt;&lt;/a&gt; Limit the select chunks operation time&lt;br/&gt;
Branch: v6.3&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ed2a1d626231da574e86e99dd584c42e364f0300&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ed2a1d626231da574e86e99dd584c42e364f0300&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5343948" author="xgen-internal-githook" created="Thu, 13 Apr 2023 11:52:20 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Silvia Surroca&apos;, &apos;email&apos;: &apos;silvia.surroca@mongodb.com&apos;, &apos;username&apos;: &apos;silviasuhu&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-71009&quot; title=&quot;Make sure the select chunks operation doesn&amp;#39;t take too long&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-71009&quot;&gt;&lt;del&gt;SERVER-71009&lt;/del&gt;&lt;/a&gt; Limit the select chunks operation time&lt;/p&gt;

&lt;p&gt;(cherry picked from commit bdd5308d1b1dbc3d55a35a5a6ef4700d58bf32af)&lt;br/&gt;
Branch: v7.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cfbfeae2c34db7fe134803e420134a1b7fc52a4c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cfbfeae2c34db7fe134803e420134a1b7fc52a4c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5341215" author="xgen-internal-githook" created="Wed, 12 Apr 2023 13:51:50 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Silvia Surroca&apos;, &apos;email&apos;: &apos;silvia.surroca@mongodb.com&apos;, &apos;username&apos;: &apos;silviasuhu&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-71009&quot; title=&quot;Make sure the select chunks operation doesn&amp;#39;t take too long&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-71009&quot;&gt;&lt;del&gt;SERVER-71009&lt;/del&gt;&lt;/a&gt; Limit the select chunks operation time&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bdd5308d1b1dbc3d55a35a5a6ef4700d58bf32af&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bdd5308d1b1dbc3d55a35a5a6ef4700d58bf32af&lt;/a&gt;&lt;/p&gt;</comment>
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