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    <title>MongoDB Jira</title>
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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>[SERVER-47584] Additional testing for hidden indexes</title>
                <link>https://jira.mongodb.org/browse/SERVER-47584</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Extend testing coverage for &apos;hidden index&apos;.&lt;br/&gt;
1. Ensure the query plan cache will be cleared for the given collection on hiding or unhiding an index.&lt;br/&gt;
2. Ensure hidden indexes will not be not visible for use by index filters.&lt;br/&gt;
3. Allow users to determine whether an index is hidden via the $indexStats aggregation stage.&lt;br/&gt;
4. Leave index usage statistics intact when an index is hidden. They will remain static due to non-use while hidden. Once unhidden they will continue from where they left off on use.&lt;br/&gt;
5. Replicate hidden index state on collMod or createIndexes&lt;br/&gt;
6. Persist hidden index state in the index catalog (i.e. hidden index remains hidden after restart)&lt;br/&gt;
7. Ensure the &apos;hidden&apos; flag can be found in currentOp and profiler.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1317435">SERVER-47584</key>
            <summary>Additional testing for hidden indexes</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="ruoxin.xu@mongodb.com">Ruoxin Xu</assignee>
                                    <reporter username="ruoxin.xu@mongodb.com">Ruoxin Xu</reporter>
                        <labels>
                    </labels>
                <created>Thu, 16 Apr 2020 10:32:41 +0000</created>
                <updated>Sun, 29 Oct 2023 22:09:25 +0000</updated>
                            <resolved>Thu, 30 Apr 2020 09:01:54 +0000</resolved>
                                                    <fixVersion>4.4.0-rc4</fixVersion>
                    <fixVersion>4.7.0</fixVersion>
                                    <component>Index Maintenance</component>
                    <component>Testing Infrastructure</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3062141" author="xgen-internal-githook" created="Thu, 30 Apr 2020 09:12:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ruoxin Xu&apos;, &apos;email&apos;: &apos;ruoxin.xu@mongodb.com&apos;, &apos;username&apos;: &apos;RuoxinXu&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47584&quot; title=&quot;Additional testing for hidden indexes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47584&quot;&gt;&lt;del&gt;SERVER-47584&lt;/del&gt;&lt;/a&gt; Additional testing for hidden indexes&lt;/p&gt;

&lt;p&gt;(cherry picked from commit e8fea93bf76fd89dc25cd664888b4959b472b2f9)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6a4f2a64ff3f1f1673c5cddc7b801125829f9fbe&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6a4f2a64ff3f1f1673c5cddc7b801125829f9fbe&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3061432" author="xgen-internal-githook" created="Wed, 29 Apr 2020 21:18:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ruoxin Xu&apos;, &apos;email&apos;: &apos;ruoxin.xu@mongodb.com&apos;, &apos;username&apos;: &apos;RuoxinXu&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47584&quot; title=&quot;Additional testing for hidden indexes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47584&quot;&gt;&lt;del&gt;SERVER-47584&lt;/del&gt;&lt;/a&gt; Additional testing for hidden indexes&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e8fea93bf76fd89dc25cd664888b4959b472b2f9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e8fea93bf76fd89dc25cd664888b4959b472b2f9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3048695" author="ruoxin.xu" created="Tue, 21 Apr 2020 10:08:30 +0000"  >&lt;p&gt;On collMod() on indexes, the IndexCatalog will be notified and refresh the index entry which resets the &apos;accesses&apos; field, an indicator indicating the number of operations that have used this index. So the current behaviour does not quite match testing point &lt;b&gt;&quot;4. Leave index usage statistics intact when an index is hidden. They will remain static due to non-use while hidden. Once unhidden they will continue from where they left off on use.&quot;&lt;/b&gt;, but &apos;spec&apos; related fields of the hidden index stay intact and static while hidden.&lt;/p&gt;</comment>
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