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    <title>MongoDB Jira</title>
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    <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-78439] Investigate IDL generated parser performance</title>
                <link>https://jira.mongodb.org/browse/SERVER-78439</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;IDL generated parsers cost O(N x M) where N = number of fields in the document and M = number of fields defined in IDL. This is due to the fact that each field in a document is checked against each field in the IDL until one is found.  Over releases, the value of M has grown larger and the IDL generated parsers are a source of release over release slow down.&lt;/p&gt;

&lt;p&gt;I have briefly investigated using a generated trie instead of a linear scan. I should do more investigation since the results were inconclusive. I should consider a full trie for instance and maybe a hybrid trie (say 1 level deep) approach.&lt;/p&gt;

&lt;p&gt;I should microbenchmark different sizes of M and on different documents of N. The most important two cases are findOne, small agg and insertOne. Slower commands will not be impacted by this slowdown.&lt;/p&gt;

&lt;p&gt;Finally, one other issue in the generated IDL parsers for commands is how generic args are handled. The generic args are inefficiently checked today as they are always checked after all M IDL fields are checked. Now that generic args are part of IDL, we should evaluate merging them into the command parsers as ignored fields.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2377159">SERVER-78439</key>
            <summary>Investigate IDL generated parser performance</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="mark.benvenuto@mongodb.com">Mark Benvenuto</assignee>
                                    <reporter username="mark.benvenuto@mongodb.com">Mark Benvenuto</reporter>
                        <labels>
                    </labels>
                <created>Mon, 26 Jun 2023 15:50:51 +0000</created>
                <updated>Tue, 28 Nov 2023 18:57:13 +0000</updated>
                            <resolved>Mon, 24 Jul 2023 19:37:10 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5587433" author="xgen-internal-githook" created="Mon, 24 Jul 2023 18:33:40 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Mark Benvenuto&apos;, &apos;email&apos;: &apos;mark.benvenuto@mongodb.com&apos;, &apos;username&apos;: &apos;markbenvenuto&apos;}
&lt;p&gt;Message: &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; Improve IDL generated parser performance&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/003346994ba24b12de67c4883263ceca393d5c32&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/003346994ba24b12de67c4883263ceca393d5c32&lt;/a&gt;&lt;/p&gt;</comment>
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                <issuelinks>
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                                        <issuelink>
            <issuekey id="2459664">SERVER-81876</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2511026">SERVER-83671</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2494101">SERVER-82940</issuekey>
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