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    <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-654] $push allows BSON object to exceed 4MB</title>
                <link>https://jira.mongodb.org/browse/SERVER-654</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Growing an object size through the use of $push doesn&apos;t trigger the 4MB object limit error.&lt;/p&gt;

&lt;p&gt;JS shell session that creates an object of 5MB, by $push ing 1MB strings onto an array:&lt;/p&gt;

&lt;p&gt;&amp;gt; s = &quot;x&quot;&lt;br/&gt;
&amp;gt; for(i = 0; i &amp;lt; 20; i++) s += s&lt;br/&gt;
&amp;gt; s.length  // 1MB string&lt;br/&gt;
1048576&lt;br/&gt;
&amp;gt; db.test.remove()&lt;br/&gt;
&amp;gt; db.test.insert(&lt;/p&gt;
{a:[]}
&lt;p&gt;)&lt;br/&gt;
ObjectId(&quot;4b83590a8f668d84b215eaa5&quot;)&lt;br/&gt;
&amp;gt; for(i = 0; i &amp;lt; 5; i++) db.test.update({}, {$push: {a:s}})  // push 5 times = ~5 MB object size&lt;br/&gt;
&amp;gt; db.test.findOne().a.length&lt;br/&gt;
5&lt;br/&gt;
&amp;gt; db.getLastError()&lt;br/&gt;
null&lt;/p&gt;
</description>
                <environment></environment>
        <key id="11351">SERVER-654</key>
            <summary>$push allows BSON object to exceed 4MB</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="9">Done</resolution>
                                        <assignee username="eliot">Eliot Horowitz</assignee>
                                    <reporter username="goosmurf">Yun Huang Yong</reporter>
                        <labels>
                    </labels>
                <created>Mon, 22 Feb 2010 23:29:57 +0000</created>
                <updated>Tue, 12 Jul 2016 00:29:56 +0000</updated>
                            <resolved>Tue, 23 Feb 2010 13:23:00 +0000</resolved>
                                    <version>1.3.2</version>
                                    <fixVersion>1.3.3</fixVersion>
                                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="12503" author="eliot" created="Tue, 23 Feb 2010 18:40:30 +0000"  >&lt;p&gt;not quite - there are a few places its a bit different for now&lt;br/&gt;
at some point maybe&lt;/p&gt;</comment>
                            <comment id="12500" author="goosmurf" created="Tue, 23 Feb 2010 17:58:02 +0000"  >&lt;p&gt;Would it be tidier to MaxBSONObjectSize from db.h instead of the magic number?&lt;/p&gt;</comment>
                            <comment id="12476" author="auto" created="Tue, 23 Feb 2010 13:23:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;login&apos;: &apos;erh&apos;, &apos;name&apos;: &apos;Eliot Horowitz&apos;, &apos;email&apos;: &apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: check that objects modified with $ operators are &amp;lt;= 4mb &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-654&quot; title=&quot;$push allows BSON object to exceed 4MB&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-654&quot;&gt;&lt;del&gt;SERVER-654&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/0f88bb48d2e1dc476487042db1c5b47d0bd9e69c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/0f88bb48d2e1dc476487042db1c5b47d0bd9e69c&lt;/a&gt;&lt;/p&gt;</comment>
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