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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-82940] Use tries for IDL enumeration lookups</title>
                <link>https://jira.mongodb.org/browse/SERVER-82940</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-78439&quot; title=&quot;Investigate IDL generated parser performance&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-78439&quot;&gt;&lt;del&gt;SERVER-78439&lt;/del&gt;&lt;/a&gt; improved the performance of decoding field names in BSON objects over a simple series of if() statements, by using a trie to do the decoding and thus scanning the string only once.  The same method can be used to decode enumeration values to improve performance there.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2494101">SERVER-82940</key>
            <summary>Use tries for IDL enumeration lookups</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="billy.donahue@mongodb.com">Billy Donahue</assignee>
                                    <reporter username="matthew.russotto@mongodb.com">Matthew Russotto</reporter>
                        <labels>
                            <label>perf-8.0</label>
                            <label>perf-tiger</label>
                            <label>perf-tiger-handoff</label>
                            <label>perf-tiger-q4</label>
                    </labels>
                <created>Wed, 8 Nov 2023 14:22:43 +0000</created>
                <updated>Wed, 7 Feb 2024 08:56:14 +0000</updated>
                            <resolved>Wed, 7 Feb 2024 08:56:14 +0000</resolved>
                                                    <fixVersion>8.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="6073607" author="xgen-internal-githook" created="Wed, 7 Feb 2024 00:52:15 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Billy Donahue&apos;, &apos;email&apos;: &apos;BillyDonahue@users.noreply.github.com&apos;, &apos;username&apos;: &apos;BillyDonahue&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-82940&quot; title=&quot;Use tries for IDL enumeration lookups&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82940&quot;&gt;&lt;del&gt;SERVER-82940&lt;/del&gt;&lt;/a&gt; 1-liner fix bsonobj lifetime in benchmark (#18757)&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: 7470781f37c438e70d3a1f2762ba80a5a30e2a97&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b1989de9d97eeb852e7302d3e650b01c6eefbd6c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b1989de9d97eeb852e7302d3e650b01c6eefbd6c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="6051240" author="xgen-internal-githook" created="Tue, 30 Jan 2024 01:23:58 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Billy Donahue&apos;, &apos;email&apos;: &apos;billy.donahue@mongodb.com&apos;, &apos;username&apos;: &apos;BillyDonahue&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-82940&quot; title=&quot;Use tries for IDL enumeration lookups&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82940&quot;&gt;&lt;del&gt;SERVER-82940&lt;/del&gt;&lt;/a&gt; use trie for parsing IDL string enums&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: d9c2db069faddf633cdf7eb81ca13ea1ababf7eb&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/741c19f225409cc08c400191b1ffc0a084948f3a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/741c19f225409cc08c400191b1ffc0a084948f3a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="6005520" author="jason.chan" created="Thu, 11 Jan 2024 21:27:03 +0000"  >&lt;p&gt;Re-opening since we decided to stick with the trie implementation, but will first wait on &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-83671&quot; title=&quot;Implement lookup tries for IDL parse in C++&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-83671&quot;&gt;SERVER-83671&lt;/a&gt; to move the trie implementation from python to C++ for better code maintenance.&lt;/p&gt;</comment>
                            <comment id="5918101" author="jason.chan" created="Fri, 1 Dec 2023 13:32:16 +0000"  >&lt;p&gt;Closing in favor of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-81876&quot; title=&quot;Improve IDL code generation for command parsers&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-81876&quot;&gt;&lt;del&gt;SERVER-81876&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5912717" author="judah.schvimer" created="Wed, 29 Nov 2023 16:01:34 +0000"  >&lt;p&gt;We should consider using a method like &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-81876&quot; title=&quot;Improve IDL code generation for command parsers&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-81876&quot;&gt;&lt;del&gt;SERVER-81876&lt;/del&gt;&lt;/a&gt; for even faster decoding.&lt;/p&gt;</comment>
                            <comment id="5909974" author="billy.donahue" created="Tue, 28 Nov 2023 18:46:05 +0000"  >&lt;p&gt;I think the tries as implemented in IDL right now should be backed out and rewritten as C++ containers before we expand their uses. I captured this as &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-83671&quot; title=&quot;Implement lookup tries for IDL parse in C++&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-83671&quot;&gt;SERVER-83671&lt;/a&gt;.&lt;/p&gt;</comment>
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