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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-51524] Alias internalQueryCacheSize to internalQueryCacheMaxEntriesPerCollection </title>
                <link>https://jira.mongodb.org/browse/SERVER-51524</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The server has a setParameter called &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a88407ca7f8467b63a4a316cbbbc7b7c0ca7af90/src/mongo/db/query/query_knobs.idl#L92&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;internalQueryCacheSize&lt;/tt&gt;&lt;/a&gt; which controls the maximum number of plan cache entries allowed in a single collection&apos;s plan cache. The parameter is poorly named, since it is not clear from the name whether the size is measured in number of entries or some other unit, such as bytes. It&apos;s also not clear that this is a maximum. And it&apos;s not clear whether the limit applies globally across all plan caches or whether the limit is per-collection.&lt;/p&gt;

&lt;p&gt;In order to clarify some of these questions, we should rename &lt;tt&gt;internalQueryCacheSize&lt;/tt&gt; to &lt;tt&gt;internalQueryCacheMaxEntriesPerCollection&lt;/tt&gt;. This will also help avoid confusion after related ticket &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40361&quot; title=&quot;Reduce memory footprint of plan cache entries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40361&quot;&gt;&lt;del&gt;SERVER-40361&lt;/del&gt;&lt;/a&gt; is implemented, since &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40361&quot; title=&quot;Reduce memory footprint of plan cache entries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40361&quot;&gt;&lt;del&gt;SERVER-40361&lt;/del&gt;&lt;/a&gt; will introduce a separate plan cache size-related parameter called &lt;tt&gt;internalQueryCacheMaxSizeBytesBeforeStripDebugInfo&lt;/tt&gt;. The rename proposed here will make sure that the two different plan cache size parameters cannot be easily confused with one another.&lt;/p&gt;

&lt;p&gt;In order to avoid a breaking change for any user that has configured &lt;tt&gt;internalQueryCacheSize&lt;/tt&gt; in a config file or on the command line, we continue to allow &lt;tt&gt;internalQueryCacheSize&lt;/tt&gt; as a deprecated alias for{{internalQueryCacheMaxSizeBytesBeforeStripDebugInfo}}.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1513157">SERVER-51524</key>
            <summary>Alias internalQueryCacheSize to internalQueryCacheMaxEntriesPerCollection </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="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                            <label>qexec-team</label>
                    </labels>
                <created>Tue, 13 Oct 2020 20:44:28 +0000</created>
                <updated>Sun, 29 Oct 2023 22:02:02 +0000</updated>
                            <resolved>Fri, 6 Nov 2020 14:28:46 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="3479406" author="xgen-internal-githook" created="Fri, 6 Nov 2020 14:24:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;David Storch&apos;, &apos;email&apos;: &apos;david.storch@mongodb.com&apos;, &apos;username&apos;: &apos;dstorch&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-51524&quot; title=&quot;Alias internalQueryCacheSize to internalQueryCacheMaxEntriesPerCollection &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51524&quot;&gt;&lt;del&gt;SERVER-51524&lt;/del&gt;&lt;/a&gt; Rename internalQueryCacheSize to internalQueryCacheMaxEntriesPerCollection&lt;/p&gt;

&lt;p&gt;Retains &quot;internalQueryCacheSize&quot; as a deprecated alias.&lt;/p&gt;

&lt;p&gt;The new name better reflects the function of the parameter,&lt;br/&gt;
as it controls the number of cache entries allowed for each&lt;br/&gt;
collection&apos;s cache rather than the overall size of the cache&lt;br/&gt;
in bytes.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5da1a52746a85a54b2809e8901da707a35d78e22&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5da1a52746a85a54b2809e8901da707a35d78e22&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="724151">SERVER-40361</issuekey>
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