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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-62094] Incorrect memory usage calculation in $top/$bottom/$topN/$bottomN window functions due to Document field caching</title>
                <link>https://jira.mongodb.org/browse/SERVER-62094</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The Document class has a cache to speed up accessing fields on large documents that can increase the value of getApproximateSize as fields are accessed. The outer window function code greedily calls fillCache() on input documents so that their field caches are stable and remove() calls subtracts the same amount of memory as the corresponding add() call removed. However these accumulators still run into the issue since they generate a new Document Value when they calculate sortKeys and it starts out with an empty cache. remove() searches through the internal map structure to remove the value provided, so by the time we do the memory calculation the sortKey&apos;s field cache is already fully populated, thus causing remove() calls to subtract more memory than add() added.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1952136">SERVER-62094</key>
            <summary>Incorrect memory usage calculation in $top/$bottom/$topN/$bottomN window functions due to Document field caching</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="mickey.winters@mongodb.com">Mickey Winters</assignee>
                                    <reporter username="mickey.winters@mongodb.com">Mickey Winters</reporter>
                        <labels>
                    </labels>
                <created>Thu, 16 Dec 2021 14:47:26 +0000</created>
                <updated>Sun, 29 Oct 2023 21:44:58 +0000</updated>
                            <resolved>Sat, 18 Dec 2021 00:31:36 +0000</resolved>
                                    <version>5.2.0-rc1</version>
                                    <fixVersion>5.3.0</fixVersion>
                    <fixVersion>5.2.0-rc3</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4258102" author="xgen-internal-githook" created="Sat, 18 Dec 2021 03:07:02 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mickey. J Winters&apos;, &apos;email&apos;: &apos;mickey.winters@mongodb.com&apos;, &apos;username&apos;: &apos;mjrb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62094&quot; title=&quot;Incorrect memory usage calculation in $top/$bottom/$topN/$bottomN window functions due to Document field caching&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62094&quot;&gt;&lt;del&gt;SERVER-62094&lt;/del&gt;&lt;/a&gt; fix memory tracking in $top/$bottom/$topN/$bottomN window functions to prevent underflow&lt;/p&gt;

&lt;p&gt;(cherry-picked from commit 8376b0cbfcffb3d6737eaa1b42d0879df562fe0a)&lt;br/&gt;
Branch: v5.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ecfa7547f6a1b1fef7efe7f8233ea06203001f40&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ecfa7547f6a1b1fef7efe7f8233ea06203001f40&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4258050" author="xgen-internal-githook" created="Sat, 18 Dec 2021 00:28:40 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mickey. J Winters&apos;, &apos;email&apos;: &apos;mickey.winters@mongodb.com&apos;, &apos;username&apos;: &apos;mjrb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62094&quot; title=&quot;Incorrect memory usage calculation in $top/$bottom/$topN/$bottomN window functions due to Document field caching&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62094&quot;&gt;&lt;del&gt;SERVER-62094&lt;/del&gt;&lt;/a&gt; fix memory tracking in $top/$bottom/$topN/$bottomN window functions to prevent underflow&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8376b0cbfcffb3d6737eaa1b42d0879df562fe0a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8376b0cbfcffb3d6737eaa1b42d0879df562fe0a&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1919133">SERVER-61281</issuekey>
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