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    <title>MongoDB Jira</title>
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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-29113] Have WT grouped collections support random cursors</title>
                <link>https://jira.mongodb.org/browse/SERVER-29113</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;With multiple MongoDB collections grouped inside a single WT table, WT&apos;s random cursor configuration has no way to tell it&apos;s returning a document that belongs to the collection queried.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/bd678a44e7b087753024b27b2a75a465e00c7b89/src/mongo/db/storage/wiredtiger/wiredtiger_record_store.cpp#L639&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/bd678a44e7b087753024b27b2a75a465e00c7b89/src/mongo/db/storage/wiredtiger/wiredtiger_record_store.cpp#L639&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Grouping collections into WT tables will not mix with the existing random cursor implementation (passing &quot;next_random&quot; to the cursor config). Current options (disregarding feasibility) include:&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Leave the RandomCursor method unimplemented for grouped record stores. The query layer has a default walking implementation.&lt;/li&gt;
	&lt;li&gt;Make calls to WT with a &quot;next_random&quot; cursor. This can return a document that does not belong to the collection. Repeat calls until a valid document is returned.&lt;/li&gt;
	&lt;li&gt;Add work to WT that allows a random cursor to respect a range of keys to select from.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;A hybrid of the first two may cover most use cases. When the collection to sample is small, the overhead of a walking cursor is small. When a collection is large (relative to the entire table), sampling random documents from the table will often return one belonging to the collection of interest. Large collections that are small relative to the table is a use-case not particularly suited to grouped collections.&lt;/p&gt;</description>
                <environment></environment>
        <key id="382017">SERVER-29113</key>
            <summary>Have WT grouped collections support random cursors</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="daniel.gottlieb@mongodb.com">Daniel Gottlieb</reporter>
                        <labels>
                    </labels>
                <created>Mon, 8 May 2017 17:59:46 +0000</created>
                <updated>Tue, 6 Dec 2022 04:01:32 +0000</updated>
                            <resolved>Mon, 9 Nov 2020 19:53:42 +0000</resolved>
                                                                    <component>Storage</component>
                                        <votes>1</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1580203" author="daniel.gottlieb@10gen.com" created="Thu, 25 May 2017 18:27:25 +0000"  >&lt;p&gt;Heavy-lifting to be done in WT. This ticket will be for integrating into MongoDB.&lt;/p&gt;</comment>
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            <issuekey id="386999">WT-3341</issuekey>
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