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    <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-13540] Investigate changes in SERVER-46084: Don&apos;t use $setUnion in aggregation for finding inconsistent sharded indexes</title>
                <link>https://jira.mongodb.org/browse/DOCS-13540</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;

    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    This ticket updated and finalized the aggregation pipeline we expect users to run to verify the indexes for a sharded collection are correct across all shards that was initially added by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44916&quot; title=&quot;Test and document a pipeline to find inconsistent indexes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44916&quot;&gt;&lt;del&gt;SERVER-44916&lt;/del&gt;&lt;/a&gt;. The pipeline is written out in full in this jstest: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2eaf0ba58cca9e96276e8a07a3d46f0a7b83289d/jstests/sharding/index_stats_pipeline_detects_inconsistent_indexes.js#L20-L72&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/2eaf0ba58cca9e96276e8a07a3d46f0a7b83289d/jstests/sharding/index_stats_pipeline_detects_inconsistent_indexes.js#L20-L72&lt;/a&gt;&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;
&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    The aggregation added in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44916&quot; title=&quot;Test and document a pipeline to find inconsistent indexes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44916&quot;&gt;&lt;del&gt;SERVER-44916&lt;/del&gt;&lt;/a&gt; and used in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45389&quot; title=&quot;Add metrics tracking how often shards have inconsistent indexes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45389&quot;&gt;&lt;del&gt;SERVER-45389&lt;/del&gt;&lt;/a&gt; to find inconsistent sharded indexes relies on $setUnion providing a consistent ordering, which is not supported. Instead, the pipeline will only consider fields known to be important, like name, key, and expireAfterSeconds until&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29425&quot; title=&quot;Add an expression to sort an array&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29425&quot;&gt;&lt;del&gt;SERVER-29425&lt;/del&gt;&lt;/a&gt; adds a supported way to sort an array.&lt;/p&gt;


&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="1289474">DOCS-13540</key>
            <summary>Investigate changes in SERVER-46084: Don&apos;t use $setUnion in aggregation for finding inconsistent sharded indexes</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="13201">Fixed</resolution>
                                        <assignee username="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Tue, 24 Mar 2020 22:25:47 +0000</created>
                <updated>Mon, 13 Nov 2023 18:07:35 +0000</updated>
                            <resolved>Wed, 8 Apr 2020 17:19:55 +0000</resolved>
                                                    <fixVersion>4.4.0-rc0</fixVersion>
                    <fixVersion>4.2.6</fixVersion>
                    <fixVersion>4.7.0</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due>Fri, 10 Apr 2020 00:00:00 +0000</due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3048944" author="xgen-internal-githook" created="Tue, 21 Apr 2020 13:22:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13540&quot; title=&quot;Investigate changes in SERVER-46084: Don&amp;#39;t use $setUnion in aggregation for finding inconsistent sharded indexes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13540&quot;&gt;&lt;del&gt;DOCS-13540&lt;/del&gt;&lt;/a&gt;: agg pipeline to find inconsistent indexes for sharded collection&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/ad0166311aa09c39c0549a852bc5c20d3b70b916&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/ad0166311aa09c39c0549a852bc5c20d3b70b916&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3031445" author="xgen-internal-githook" created="Wed, 8 Apr 2020 17:19:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13540&quot; title=&quot;Investigate changes in SERVER-46084: Don&amp;#39;t use $setUnion in aggregation for finding inconsistent sharded indexes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13540&quot;&gt;&lt;del&gt;DOCS-13540&lt;/del&gt;&lt;/a&gt;: agg pipeline to find inconsistent indexes for sharded collection&lt;br/&gt;
Branch: v4.2.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/19035fa33acf413783981daf88f7a0ccae62dd45&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/19035fa33acf413783981daf88f7a0ccae62dd45&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3031436" author="xgen-internal-githook" created="Wed, 8 Apr 2020 17:15:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13540&quot; title=&quot;Investigate changes in SERVER-46084: Don&amp;#39;t use $setUnion in aggregation for finding inconsistent sharded indexes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13540&quot;&gt;&lt;del&gt;DOCS-13540&lt;/del&gt;&lt;/a&gt;: agg pipeline to find inconsistent indexes for sharded collection&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/c5a3c5ddad6689864227d2c2fa0626884dc0dc0a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/c5a3c5ddad6689864227d2c2fa0626884dc0dc0a&lt;/a&gt;&lt;/p&gt;</comment>
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