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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-43993] Improve Document memory usage during blocking sort</title>
                <link>https://jira.mongodb.org/browse/SERVER-43993</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The changes in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42565&quot; title=&quot;Aggregations and find commands sort missing fields differently&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42565&quot;&gt;&lt;del&gt;SERVER-42565&lt;/del&gt;&lt;/a&gt; lead sort key generation to perform field lookups on Document objects instead of raw BSON. These lookups fault field values into each Document&apos;s internal field cache. In the worst case, a single lookup can fault in every field, causing every Document in the blocking sort to use up twice as much memory.&lt;/p&gt;

&lt;p&gt;This worst case occurred in BF-14987, where a blocking sort that was supposed to fit in memory instead exceeds the memory limit for sorts.&lt;/p&gt;

&lt;p&gt;We have two possible approaches in mind to fix this:&lt;br/&gt;
1) Always perform projection before a blocking sort (but after sort key generation). After projection is done, there is no performance benefit from keeping the original BSON around. We can pull all of a Document&apos;s BSON into its cache and destroy the underlying BSON.&lt;/p&gt;

&lt;p&gt;2) Add a non-faulting lookup function to Document and use that for sort key generation.&lt;/p&gt;</description>
                <environment></environment>
        <key id="969166">SERVER-43993</key>
            <summary>Improve Document memory usage during blocking sort</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="3">Duplicate</resolution>
                                        <assignee username="ian.boros@mongodb.com">Ian Boros</assignee>
                                    <reporter username="justin.seyster@mongodb.com">Justin Seyster</reporter>
                        <labels>
                            <label>qexec-team</label>
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                <created>Mon, 14 Oct 2019 18:48:50 +0000</created>
                <updated>Thu, 2 Apr 2020 18:06:40 +0000</updated>
                            <resolved>Thu, 2 Apr 2020 18:06:40 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3023718" author="ian.boros" created="Thu, 2 Apr 2020 18:06:25 +0000"  >&lt;p&gt;Given that we&apos;ve implemented suggestion (2) under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45763&quot; title=&quot;Optimize extractKeyFast() fallback path&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45763&quot;&gt;&lt;del&gt;SERVER-45763&lt;/del&gt;&lt;/a&gt;, I&apos;m closing this as a duplicate.&lt;/p&gt;</comment>
                            <comment id="2886720" author="david.storch" created="Thu, 20 Feb 2020 15:51:34 +0000"  >&lt;p&gt;Justin is moving onto other priorities, so I&apos;m marking this to be re-triaged.&lt;/p&gt;</comment>
                            <comment id="2489891" author="david.storch" created="Fri, 18 Oct 2019 15:11:24 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=justin.seyster&quot; class=&quot;user-hover&quot; rel=&quot;justin.seyster&quot;&gt;justin.seyster&lt;/a&gt; can you investigate possible approaches for this problem during this sprint?&lt;/p&gt;</comment>
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