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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-10643] Document max document wire size in isMaster</title>
                <link>https://jira.mongodb.org/browse/SERVER-10643</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The isMaster command result contains two fields related to size: &lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;maxBsonObjectSize: the maximum size of a document that will be stored in a mongo collection.&lt;/li&gt;
	&lt;li&gt;maxMessageSizeBytes: the maximum size of a wire protocol message&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;This is a request for a third:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;maxBsonWireObjectSize: the maximum size of a document not intended for storage that is included in a wire protocol message.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The reason this is necessary is that current drivers will not correctly send a command that includes a document that is close to the 16MB limit, because drivers apply maxBsonObjectSize to all documents, including command documents.  Ao for example, most drivers will reject a findAndModify that contains a 16MB replacement document.  With the new write commands, they will reject an insert of a 16MB document.&lt;/p&gt;

&lt;p&gt;Looking at the server code, the current value of maxBsonWireObjectSize is 16MB + 16K: &lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;mongo/bson/util/builder.h:    const int BSONObjMaxInternalSize = BSONObjMaxUserSize + ( 16 * 1024 )&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;Drivers can use this new field to impose a different limit on command documents than they impose on documents intended for storage.  Without, they will have to hardcode the value in a constant, which is less than ideal, as it may change in the future.&lt;/p&gt;</description>
                <environment></environment>
        <key id="87893">SERVER-10643</key>
            <summary>Document max document wire size in isMaster</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="greg_10gen">Greg Studer</assignee>
                                    <reporter username="jeff.yemin@mongodb.com">Jeffrey Yemin</reporter>
                        <labels>
                    </labels>
                <created>Thu, 29 Aug 2013 15:46:58 +0000</created>
                <updated>Mon, 26 Aug 2019 14:47:26 +0000</updated>
                            <resolved>Tue, 7 Jan 2014 18:09:35 +0000</resolved>
                                                                    <component>Usability</component>
                                        <votes>0</votes>
                                    <watches>13</watches>
                                                                                                                <comments>
                            <comment id="478410" author="greg_10gen" created="Tue, 7 Jan 2014 18:09:35 +0000"  >&lt;p&gt;Write commands are now bounded by the number of docs in the command and MaxBSONObjSize.  As with other commands that act on documents, clients should assume the internal BSON size is large enough to handle the documents themselves plus the command overhead.&lt;/p&gt;

&lt;p&gt;See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12275&quot; title=&quot;Add MaxWriteBatchSize to isMaster results.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12275&quot;&gt;&lt;del&gt;SERVER-12275&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
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            <issuekey id="890920">CDRIVER-3310</issuekey>
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