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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-79975] [Classic] Optimize large group keys</title>
                <link>https://jira.mongodb.org/browse/SERVER-79975</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;After 4.4 we switched mongo::Document to use lazy shredding instead of eager shredding. If a customer has a large group key over large documents with potentially missing fields this can result in lots of linear look ups for each field resulting in O(n^2) type behavior. where N is the number of fields in a document. The goal is to fix this issue for 5.0 since &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79548&quot; title=&quot;[SBE] optimize pulling multiple fields out of a large document&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79548&quot;&gt;SERVER-79548&lt;/a&gt; should fix this for SBE&lt;/p&gt;</description>
                <environment></environment>
        <key id="2416872">SERVER-79975</key>
            <summary>[Classic] Optimize large group keys</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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>
                            <label>auto-reverted</label>
                    </labels>
                <created>Mon, 14 Aug 2023 15:44:15 +0000</created>
                <updated>Fri, 8 Dec 2023 19:18:27 +0000</updated>
                            <resolved>Tue, 31 Oct 2023 20:27:05 +0000</resolved>
                                                    <fixVersion>7.2.0-rc0</fixVersion>
                    <fixVersion>5.0.22</fixVersion>
                    <fixVersion>6.0.12</fixVersion>
                    <fixVersion>7.0.4</fixVersion>
                                                        <votes>1</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="5847969" author="xgen-internal-githook" created="Thu, 2 Nov 2023 00:04:49 +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-79975&quot; title=&quot;[Classic] Optimize large group keys&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79975&quot;&gt;&lt;del&gt;SERVER-79975&lt;/del&gt;&lt;/a&gt; add document shredder stage&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a0b6e66c6dab285228504997bbc998c9d5942ba2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a0b6e66c6dab285228504997bbc998c9d5942ba2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5796298" author="xgen-internal-githook" created="Fri, 20 Oct 2023 21:58:37 +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-79975&quot; title=&quot;[Classic] Optimize large group keys&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79975&quot;&gt;&lt;del&gt;SERVER-79975&lt;/del&gt;&lt;/a&gt; add document shredder stage&lt;br/&gt;
Branch: v7.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ea2457a45e990a9ab9c664f0f16c2ae02f9c33c9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ea2457a45e990a9ab9c664f0f16c2ae02f9c33c9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5754169" author="xgen-internal-githook" created="Thu, 5 Oct 2023 00:03:59 +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-79975&quot; title=&quot;[Classic] Optimize large group keys&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79975&quot;&gt;&lt;del&gt;SERVER-79975&lt;/del&gt;&lt;/a&gt; add document shredder stage&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/779c37d5e96f264d5ebd5d901668ff26448eb932&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/779c37d5e96f264d5ebd5d901668ff26448eb932&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5737105" author="xgen-buildbaron-user" created="Thu, 28 Sep 2023 11:50:11 +0000"  >&lt;p&gt;Ticket re-opened due to revert. &lt;a href=&quot;https://evergreen.mongodb.com/task/mongodb_mongo_master_rhel80_debug_aubsan_all_feature_flags_cqf_experimental_aggregation_passthrough_1a474953f59a356c1a8da08f2463be30af4610ae_23_09_27_22_43_18&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;cqf_experimental_aggregation_passthrough&lt;/a&gt; began a consistent failure of jstests/aggregation/sources/shred_documents.js&lt;/p&gt;</comment>
                            <comment id="5737102" author="xgen-internal-githook" created="Thu, 28 Sep 2023 11:49:23 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;auto-revert-processor&apos;, &apos;email&apos;: &apos;dev-prod-dag@mongodb.com&apos;, &apos;username&apos;: &apos;&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79975&quot; title=&quot;[Classic] Optimize large group keys&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79975&quot;&gt;&lt;del&gt;SERVER-79975&lt;/del&gt;&lt;/a&gt; add document shredder stage&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 1a474953f59a356c1a8da08f2463be30af4610ae.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2a4b25b7854a2361bbd3c79ba37acecfe1dacddf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2a4b25b7854a2361bbd3c79ba37acecfe1dacddf&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5736183" author="xgen-internal-githook" created="Wed, 27 Sep 2023 22:43:21 +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-79975&quot; title=&quot;[Classic] Optimize large group keys&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79975&quot;&gt;&lt;del&gt;SERVER-79975&lt;/del&gt;&lt;/a&gt; add document shredder stage&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1a474953f59a356c1a8da08f2463be30af4610ae&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1a474953f59a356c1a8da08f2463be30af4610ae&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5732837" author="xgen-internal-githook" created="Tue, 26 Sep 2023 20:54:58 +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-79975&quot; title=&quot;[Classic] Optimize large group keys&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79975&quot;&gt;&lt;del&gt;SERVER-79975&lt;/del&gt;&lt;/a&gt; add document shredder stage&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0258e64a280960dc0bd0273cb27ca46d8697fc1d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0258e64a280960dc0bd0273cb27ca46d8697fc1d&lt;/a&gt;&lt;/p&gt;</comment>
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