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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>
    </build-info>


<item>
            <title>[SERVER-76390] Refine UpdateIndexData class so that it has index to field path mapping</title>
                <link>https://jira.mongodb.org/browse/SERVER-76390</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;After &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-70984&quot; title=&quot;Decouple the concepts &amp;quot;in-place updates&amp;quot; and &amp;quot;index updates&amp;quot;&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-70984&quot;&gt;&lt;del&gt;SERVER-70984&lt;/del&gt;&lt;/a&gt;, we will stop using the &lt;tt&gt;UpdateIndexData&lt;/tt&gt; data store in &lt;tt&gt;CollectionRoutingInfo&lt;/tt&gt;. We have this information replicated on &lt;tt&gt;IndexCatalogEntryImpl&lt;/tt&gt; class. We should consider keeping a single &lt;tt&gt;UpdateIndexData&lt;/tt&gt; variable in the CollectionQueryInfo, but extend it so that it can store the &lt;tt&gt;FieldRef&lt;/tt&gt;, &lt;tt&gt;std::string&lt;/tt&gt; and &lt;tt&gt;allPathIndexed&lt;/tt&gt; information for each separate index. This way it is also available for columnar indexes to obtain the separate paths without polluting the storage code&lt;/p&gt;</description>
                <environment></environment>
        <key id="2320490">SERVER-76390</key>
            <summary>Refine UpdateIndexData class so that it has index to field path mapping</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="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="arun.banala@mongodb.com">Arun Banala</reporter>
                        <labels>
                    </labels>
                <created>Fri, 21 Apr 2023 00:33:16 +0000</created>
                <updated>Tue, 30 Jan 2024 15:21:21 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="5558780" author="JIRAUSER1259274" created="Tue, 11 Jul 2023 20:39:14 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=alberto.massari%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;alberto.massari@mongodb.com&quot;&gt;alberto.massari@mongodb.com&lt;/a&gt; I did quick local profiles back in April to evaluate whether the ticket should have been prioritized for 7.0. I haven&apos;t saved the data from those runs except for the following excerpts. I don&apos;t know how much of this is still applicable now.&lt;/p&gt;

&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;With just the primary index&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;     3.29%     0.40%  mongod              [.] mongo::IndexCatalogImpl::updateRecord&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            |--2.89%--mongo::IndexCatalogImpl::updateRecord&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            |          |--2.59%--mongo::doc_diff::anyIndexesMightBeAffected&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            |          |          |          |--0.37%--mongo::FieldRef::appendPart&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            |          |          |           --0.12%--mongo::doc_diff::DocumentDiffReader::nextUpdate&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            |          |          |          &lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            |          |          |--0.49%--mongo::doc_diff::DocumentDiffReader::DocumentDiffReader&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            |          |          |--0.27%--__strlen_avx2&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            |          |           --0.17%--std::vector&amp;lt;unsigned long, std::allocator&amp;lt;unsigned long&amp;gt; &amp;gt;::_M_default_append&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            |          |          &lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            |           --0.14%--tc_deletearray_sized&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;With 8 secondary indexes&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;     4.68%     0.38%  mongod              [.] mongo::IndexCatalogImpl::updateRecord&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            |--4.30%--mongo::IndexCatalogImpl::updateRecord&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            |          |          |--2.69%--mongo::doc_diff::(anonymous namespace)::anyIndexesMightBeAffected&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            |          |          |          |--0.86%--mongo::UpdateIndexData::mightBeIndexed&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            |           --0.14%--std::vector&amp;lt;unsigned long, std::allocator&amp;lt;unsigned long&amp;gt; &amp;gt;::_M_default_append&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;My understanding is that the ticket tracks a technical debt Arun wanted to address only with a side-effect of a potential perf improvement (this is why I did the profiles in April). Please follow up with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=arun.banala%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;arun.banala@mongodb.com&quot;&gt;arun.banala@mongodb.com&lt;/a&gt; if more clarifications are needed.&lt;/p&gt;</comment>
                            <comment id="5558422" author="kyle.suarez" created="Tue, 11 Jul 2023 19:10:38 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=alberto.massari%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;alberto.massari@mongodb.com&quot;&gt;alberto.massari@mongodb.com&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ian.boros%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;ian.boros@mongodb.com&quot;&gt;ian.boros@mongodb.com&lt;/a&gt;, should we consider scheduling this improvement as part of one of the block processing projects? Or is it low-priority enough to either backlog or close? CC &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=rushan.chen%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;rushan.chen@mongodb.com&quot;&gt;rushan.chen@mongodb.com&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5382934" author="JIRAUSER1259274" created="Thu, 27 Apr 2023 21:33:35 +0000"  >&lt;p&gt;I&apos;ve profiled updating every record in a collection with 1e4 simple documents and 8 secondary indexes: &lt;tt&gt;IndexCatalogImpl::updateRecord()&lt;/tt&gt;&#160;takes ~5% (including its callees). Most of this time (~4.5%) is spent inside&#160;&lt;tt&gt;doc_diff::anyIndexesMightBeAffected()&lt;/tt&gt; . When updating 1e5 records (again, updating all documents in a larger collection), the relative weight of updateRecord() and anyIndexesMightBeAffected() goes &lt;em&gt;down&lt;/em&gt;&#160;a little.&lt;/p&gt;

&lt;p&gt;With no secondary indexes&#160;&lt;tt&gt;IndexCatalogImpl::updateRecord()&lt;/tt&gt;&#160;takes ~3.5%.&lt;br/&gt;
So it doesn&apos;t look like optimizing UpdateIndexData on this path could bring tangible perf benefit.&lt;/p&gt;</comment>
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