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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-5980] Cursor batch absolute maximum size is 4MB</title>
                <link>https://jira.mongodb.org/browse/DOCS-5980</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;RE: &lt;a href=&quot;http://docs.mongodb.org/manual/core/cursors/#cursor-batches&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/core/cursors/#cursor-batches&lt;/a&gt;&lt;/p&gt;
&lt;blockquote&gt;
&lt;p&gt;Subsequent batch size is 4 megabytes. To override the default size of the batch, see batchSize() and limit().&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;These 3 things are all orthogonal.&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;The 4MB limit per &quot;getMore&quot; is an absolute compiled-in constant:&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/blob/v3.0/src/mongo/db/query/find.cpp#L71&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/v3.0/src/mongo/db/query/find.cpp#L71&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;The &quot;batchSize&quot; parameter affects how many documents will be returned in a getMore at most (the wording above suggests it can override the 4MB, but it can&apos;t, it merely applies &lt;b&gt;as well&lt;/b&gt; as the 4MB limit).&lt;/li&gt;
	&lt;li&gt;The &quot;limit&quot; parameter determines the number of documents that can be enumerated by the cursor in total - if that number fits in the first batch then the cursor terminates, but if it doesn&apos;t then the cursor batch mechanism works as normal - &quot;limit&quot; can perhaps be thought of as the sum of document counts in all batches.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="224185">DOCS-5980</key>
            <summary>Cursor batch absolute maximum size is 4MB</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="andrew.ryder@mongodb.com">Andrew Ryder</reporter>
                        <labels>
                    </labels>
                <created>Wed, 5 Aug 2015 06:28:28 +0000</created>
                <updated>Mon, 30 Oct 2023 21:43:01 +0000</updated>
                            <resolved>Tue, 1 Nov 2022 11:02:04 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="4943633" author="edu.bot" created="Tue, 1 Nov 2022 11:02:01 +0000"  >&lt;p&gt;Hello! This ticket has been closed due to inactivity. If you believe this ticket is still important, please reopen it and leave a comment to explain why. Thank you!&lt;/p&gt;</comment>
                            <comment id="2441086" author="ronald@battlefy.com" created="Mon, 30 Sep 2019 19:21:38 +0000"  >&lt;p&gt;Now 16 MB in 4.2&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/v4.2/src/mongo/db/query/find.cpp#L331&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/v4.2/src/mongo/db/query/find.cpp#L331&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/v4.2/src/mongo/db/query/find_common.h#L90&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/v4.2/src/mongo/db/query/find_common.h#L90&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/v4.2/src/mongo/bson/util/builder.h#L65&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/v4.2/src/mongo/bson/util/builder.h#L65&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
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