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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>[DOCS-14995] [SERVER] Compound 2dsphere indexes can generate a massive number of index keys per document</title>
                <link>https://jira.mongodb.org/browse/DOCS-14995</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    We may want to update documentation to reflect that we now limit the number of compound-2dsphere index keys that can be generated by a single document. If a document would generate more keys, the index build, insertion, or update will fail.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    When generating keys for 2dsphere indexes we calculate the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2d5a16adde2b17c851675c6a95f84afa33347cd1/src/mongo/db/index/expression_keys_private.cpp#L106-L128&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;cartesian products of all keys&lt;/a&gt;. &lt;/p&gt;

&lt;p&gt;If documents contain locations with a large number of location coordinates compounded with an array of a large number of elements the resulting cartesian product can be massive in size.&lt;/p&gt;

&lt;p&gt;When generating all these keys they are inserted into a single std::vector that needs to hold the cartesian product number of elements which can fail as the number is simply too large.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="1955600">DOCS-14995</key>
            <summary>[SERVER] Compound 2dsphere indexes can generate a massive number of index keys per document</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="dave.cuthbert@mongodb.com">Dave Cuthbert</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Wed, 22 Dec 2021 17:55:27 +0000</created>
                <updated>Mon, 13 Nov 2023 17:46:06 +0000</updated>
                            <resolved>Tue, 15 Feb 2022 05:49:14 +0000</resolved>
                                                    <fixVersion>5.3.0</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4354904" author="xgen-internal-githook" created="Mon, 14 Feb 2022 23:06:23 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Dave&apos;, &apos;email&apos;: &apos;69165704+davemungo@users.noreply.github.com&apos;, &apos;username&apos;: &apos;davemungo&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-14995&quot; title=&quot;[SERVER] Compound 2dsphere indexes can generate a massive number of index keys per document&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-14995&quot;&gt;&lt;del&gt;DOCS-14995&lt;/del&gt;&lt;/a&gt; limit keys for 2dsphere doc indices v5.3 (#613)&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-14995&quot; title=&quot;[SERVER] Compound 2dsphere indexes can generate a massive number of index keys per document&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-14995&quot;&gt;&lt;del&gt;DOCS-14995&lt;/del&gt;&lt;/a&gt; too many index keys&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;Compatibility&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;Limits&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;Staging updates&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;Review feedback&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;Staging fixes&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;Review feedback&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;Review feedback&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/docs-mongodb-internal/commit/aa82795f0892a3ec5d734e9408a49a36a5d5b15c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/docs-mongodb-internal/commit/aa82795f0892a3ec5d734e9408a49a36a5d5b15c&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="4264430" author="dbeng-pm-bot" created="Wed, 22 Dec 2021 17:55:30 +0000"  >&lt;p&gt;&lt;em&gt;Downstream changes updated for upstream &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61184&quot; title=&quot;Compound 2dsphere indexes can generate a massive number of index keys per document&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61184&quot;&gt;&lt;del&gt;SERVER-61184&lt;/del&gt;&lt;/a&gt;:&lt;/em&gt; &lt;br/&gt;
We may want to update documentation to reflect that we now limit the number of compound-2dsphere index keys that can be generated by a single document. If a document would generate more keys, the index build, insertion, or update will fail.&lt;/p&gt;</comment>
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