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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>
    </build-info>


<item>
            <title>[SERVER-82325] Config server could invariant during balancer round</title>
                <link>https://jira.mongodb.org/browse/SERVER-82325</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;h3&gt;&lt;a name=&quot;Summary&quot;&gt;&lt;/a&gt;Summary&lt;/h3&gt;

&lt;p&gt;In &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40459&quot; title=&quot;Optimize the construction of the balancer&amp;#39;s collection distribution status histogram&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40459&quot;&gt;&lt;del&gt;SERVER-40459&lt;/del&gt;&lt;/a&gt; we changed the logic used by the balancer to decide which chunks to move in a specific balancer round. The new code is affected by a bug, for which it could happen that we schedule more than one migration with the same donor shard.&lt;br/&gt;
When this happens, the balancer will hit &lt;a href=&quot;https://github.com/mongodb/mongo/blob/e513cd7df412a9d8c2b656ff88035160b1085457/src/mongo/db/s/balancer/balancer_policy.cpp#L625&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;an invariant&lt;/a&gt; and the primary of the config server will shut down, triggering a new primary election.&lt;/p&gt;
&lt;h3&gt;&lt;a name=&quot;Requiredconditions&quot;&gt;&lt;/a&gt;Required conditions&lt;/h3&gt;

&lt;p&gt;There are two code paths whose execution can lead to this bug and In both cases there are some necessary conditions that need to be met in order to hit the invariant.&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Sharded cluster&lt;/li&gt;
	&lt;li&gt;Balancer enabled&lt;/li&gt;
	&lt;li&gt;At least 4 shards&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;moreover, depending on the code path there are specific conditions that need to be met:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Shard removal
	&lt;ul&gt;
		&lt;li&gt;At least one shard being drained&lt;/li&gt;
		&lt;li&gt;At least one zone configured on the draining shard&lt;/li&gt;
		&lt;li&gt;Draining shard have at least two chunks belonging to different zones that can be moved in the same round to two different recipient shards.&lt;br/&gt;
Note: chunks that are not completely contained within any of the configured zones are considered to belong to the special &quot;no-zone&quot;.&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
	&lt;li&gt;Zone enforcing
	&lt;ul&gt;
		&lt;li&gt;At least two chunks residing on the same shards.&lt;/li&gt;
		&lt;li&gt;They belong to two different zones not associated to the shard.&lt;/li&gt;
		&lt;li&gt;The two chunks can be moved in the same balancer round.&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;


&lt;h3&gt;&lt;a name=&quot;Technicaldescription&quot;&gt;&lt;/a&gt;Technical description&lt;/h3&gt;

&lt;p&gt;TODO&lt;/p&gt;
&lt;h3&gt;&lt;a name=&quot;Affectedversions&quot;&gt;&lt;/a&gt;Affected versions&lt;/h3&gt;

&lt;p&gt;The only releases affected by this bug are:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;&lt;tt&gt;6.0.11&lt;/tt&gt;&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;4.4.25&lt;/tt&gt;&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="2478813">SERVER-82325</key>
            <summary>Config server could invariant during balancer round</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="tommaso.tocci@mongodb.com">Tommaso Tocci</assignee>
                                    <reporter username="tommaso.tocci@mongodb.com">Tommaso Tocci</reporter>
                        <labels>
                            <label>balancer-round-perf</label>
                    </labels>
                <created>Thu, 19 Oct 2023 14:56:33 +0000</created>
                <updated>Fri, 10 Nov 2023 14:19:15 +0000</updated>
                            <resolved>Fri, 10 Nov 2023 14:19:15 +0000</resolved>
                                    <version>4.4.25</version>
                    <version>6.0.11</version>
                                    <fixVersion>5.0.22</fixVersion>
                    <fixVersion>7.0.3</fixVersion>
                    <fixVersion>4.4.26</fixVersion>
                    <fixVersion>6.0.12</fixVersion>
                                                        <votes>0</votes>
                                    <watches>16</watches>
                                                                                                                <comments>
                            <comment id="5855753" author="xgen-internal-githook" created="Mon, 6 Nov 2023 04:15:27 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-82325&quot; title=&quot;Config server could invariant during balancer round&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82325&quot;&gt;&lt;del&gt;SERVER-82325&lt;/del&gt;&lt;/a&gt; Config server could invariant during balancer round&lt;/p&gt;

&lt;p&gt;This effectively reverts &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40459&quot; title=&quot;Optimize the construction of the balancer&amp;#39;s collection distribution status histogram&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40459&quot;&gt;&lt;del&gt;SERVER-40459&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: 1818719db3009bcc10addd016f08f35c2b6718d8&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f45ff415970f8244303c77a964948630ce3bc93b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f45ff415970f8244303c77a964948630ce3bc93b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5855628" author="xgen-internal-githook" created="Sun, 5 Nov 2023 23:48:46 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-82325&quot; title=&quot;Config server could invariant during balancer round&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82325&quot;&gt;&lt;del&gt;SERVER-82325&lt;/del&gt;&lt;/a&gt; Config server could invariant during balancer round&lt;/p&gt;

&lt;p&gt;This effectively reverts &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40459&quot; title=&quot;Optimize the construction of the balancer&amp;#39;s collection distribution status histogram&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40459&quot;&gt;&lt;del&gt;SERVER-40459&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: be9ea3f19e95fc92a6835c9c30381fb29962b45e&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1818719db3009bcc10addd016f08f35c2b6718d8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1818719db3009bcc10addd016f08f35c2b6718d8&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5854776" author="xgen-internal-githook" created="Sun, 5 Nov 2023 04:21:17 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-82325&quot; title=&quot;Config server could invariant during balancer round&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82325&quot;&gt;&lt;del&gt;SERVER-82325&lt;/del&gt;&lt;/a&gt; Config server could invariant during balancer round&lt;/p&gt;

&lt;p&gt;This effectively reverts &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40459&quot; title=&quot;Optimize the construction of the balancer&amp;#39;s collection distribution status histogram&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40459&quot;&gt;&lt;del&gt;SERVER-40459&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: 7a3c2a47cee449b5c02392b08dc5b33265cbe11b&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/be9ea3f19e95fc92a6835c9c30381fb29962b45e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/be9ea3f19e95fc92a6835c9c30381fb29962b45e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5854000" author="xgen-internal-githook" created="Sat, 4 Nov 2023 04:26:33 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-82325&quot; title=&quot;Config server could invariant during balancer round&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82325&quot;&gt;&lt;del&gt;SERVER-82325&lt;/del&gt;&lt;/a&gt; Config server could invariant during balancer round&lt;/p&gt;

&lt;p&gt;This effectively reverts &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40459&quot; title=&quot;Optimize the construction of the balancer&amp;#39;s collection distribution status histogram&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40459&quot;&gt;&lt;del&gt;SERVER-40459&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: 595d8110122be5b1ca2d951c6f71cd8ecb29b8cb&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7a3c2a47cee449b5c02392b08dc5b33265cbe11b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7a3c2a47cee449b5c02392b08dc5b33265cbe11b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5797534" author="xgen-internal-githook" created="Sun, 22 Oct 2023 04:12:51 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-82325&quot; title=&quot;Config server could invariant during balancer round&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82325&quot;&gt;&lt;del&gt;SERVER-82325&lt;/del&gt;&lt;/a&gt; Config server could invariant during balancer round&lt;/p&gt;

&lt;p&gt;This effectively reverts &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40459&quot; title=&quot;Optimize the construction of the balancer&amp;#39;s collection distribution status histogram&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40459&quot;&gt;&lt;del&gt;SERVER-40459&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: 5d091b472fa127626698ea9244e3a7fb5f727849&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/595d8110122be5b1ca2d951c6f71cd8ecb29b8cb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/595d8110122be5b1ca2d951c6f71cd8ecb29b8cb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5796189" author="tommaso.tocci" created="Fri, 20 Oct 2023 20:59:27 +0000"  >{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}

&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40459&quot; title=&quot;Optimize the construction of the balancer&amp;#39;s collection distribution status histogram&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40459&quot;&gt;&lt;del&gt;SERVER-40459&lt;/del&gt;&lt;/a&gt; Optimize the construction of the balancer&apos;s collection distribution status histogram&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 56f414fe81c8fd7ae2ad87ada1ed0f9cb1299151.&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e6230d4c34ba250a3129ccfa5da06ccbc5b6d536&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e6230d4c34ba250a3129ccfa5da06ccbc5b6d536&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5792150" author="xgen-internal-githook" created="Thu, 19 Oct 2023 19:20:29 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-82325&quot; title=&quot;Config server could invariant during balancer round&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82325&quot;&gt;&lt;del&gt;SERVER-82325&lt;/del&gt;&lt;/a&gt; Config server could invariant during balancer round&lt;br/&gt;
Branch: v7.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b96efb7e0cf6134d5938de8a94c37cec3f22cff4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b96efb7e0cf6134d5938de8a94c37cec3f22cff4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5792005" author="xgen-internal-githook" created="Thu, 19 Oct 2023 18:45:51 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-82325&quot; title=&quot;Config server could invariant during balancer round&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82325&quot;&gt;&lt;del&gt;SERVER-82325&lt;/del&gt;&lt;/a&gt; Config server could invariant during balancer round&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/302c19437ae65b7d459360e18c5ac5086f494989&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/302c19437ae65b7d459360e18c5ac5086f494989&lt;/a&gt;&lt;/p&gt;</comment>
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