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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-61184] Compound 2dsphere indexes can generate a massive number of index keys per document</title>
                <link>https://jira.mongodb.org/browse/SERVER-61184</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&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="1915557">SERVER-61184</key>
            <summary>Compound 2dsphere indexes can generate a massive number of index keys per document</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="dan.larkin-york@mongodb.com">Dan Larkin-York</assignee>
                                    <reporter username="henrik.edin@mongodb.com">Henrik Edin</reporter>
                        <labels>
                    </labels>
                <created>Tue, 2 Nov 2021 13:29:54 +0000</created>
                <updated>Sun, 29 Oct 2023 21:46:35 +0000</updated>
                            <resolved>Wed, 22 Dec 2021 17:55:25 +0000</resolved>
                                                    <fixVersion>5.3.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="4264429" author="JIRAUSER1258161" created="Wed, 22 Dec 2021 17:55:25 +0000"  >&lt;p&gt;This change does come with a minor change regarding backwards compatibility, in that previously the index build or document insertion would succeed as long as we had enough memory to build the keys and insert them. We will now fail the operation if a document would generate in excess of 100000 keys. This should impact few users, and can be worked around by increasing the value of the server parameter &apos;indexMaxNumGeneratedKeysPerDocument&apos; if the server has enough memory to handle it.&lt;/p&gt;</comment>
                            <comment id="4264399" author="xgen-internal-githook" created="Wed, 22 Dec 2021 17:42:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Henrik Edin&apos;, &apos;email&apos;: &apos;henrik.edin@mongodb.com&apos;, &apos;username&apos;: &apos;henrikedin&apos;}
&lt;p&gt;Message: &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; Add limit to number of compound 2dsphere index keys we may generate&lt;/p&gt;

&lt;p&gt;Co-authored-by: Henrik Edin&amp;lt;henrik.edin@mongodb.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/af183c9e3f8f498c89440e28c949f4079ee37b39&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/af183c9e3f8f498c89440e28c949f4079ee37b39&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4163434" author="dianna.hohensee" created="Tue, 2 Nov 2021 15:28:20 +0000"  >&lt;p&gt;We think there needs to be some limits here, so users can&apos;t shoot themselves in the foot.&lt;/p&gt;

&lt;p&gt;Alternatively: might be a bug that this is managing to happen / allowed.&lt;/p&gt;</comment>
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