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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-27302] MongoDB 3.4 returns document with duplicate &quot;roles&quot; key for &quot;rolesInfo&quot; command.</title>
                <link>https://jira.mongodb.org/browse/SERVER-27302</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When running &lt;/p&gt;


&lt;p/&gt;
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&lt;p/&gt;


&lt;p&gt;MongoDB 3.4 (but not any previous version I tested) will return a document with two &quot;roles&quot; fields:&lt;/p&gt;


&lt;p/&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;    ...&lt;/span&gt;&lt;/pre&gt;
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			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;Note that the above command will not actually produce a document with two &quot;roles&quot; keys, but on the &quot;wire&quot; (meaning the BSON binary chunk) it will be a duplicate that is then (maybe) disambiguated &quot;in some way&quot; by the driver you use.&lt;/p&gt;

&lt;p&gt;Unfortunately, the first &quot;roles&quot; entry has the data, while the second one is empty. The java driver behaves differently compared to the C based drivers, since Map::put() will overwrite existing entries, thus making the last occurrence matter, while the C based drivers use a forward scan that will always return the first occurrence.&lt;/p&gt;

&lt;p&gt;Further, I want to point out that this is NOT a bug in the java driver, but since the broken MongoDB has already been shipped to production, we still need a fix to deal with the broken MongoDBs that are in circulation.&lt;/p&gt;</description>
                <environment></environment>
        <key id="336768">SERVER-27302</key>
            <summary>MongoDB 3.4 returns document with duplicate &quot;roles&quot; key for &quot;rolesInfo&quot; command.</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="ch3tmongo">Christoph Husse</reporter>
                        <labels>
                    </labels>
                <created>Tue, 6 Dec 2016 19:05:23 +0000</created>
                <updated>Tue, 6 Dec 2016 19:23:39 +0000</updated>
                            <resolved>Tue, 6 Dec 2016 19:23:39 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1450539" author="thomas.schubert" created="Tue, 6 Dec 2016 19:23:39 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ch3tmongo&quot; class=&quot;user-hover&quot; rel=&quot;ch3tmongo&quot;&gt;ch3tmongo&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thanks for reporting this issue. This issue has been fixed under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27271&quot; title=&quot;rolesInfo command raises System.InvalidOperationException : Duplicate element name &amp;#39;roles&amp;#39;.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27271&quot;&gt;&lt;del&gt;SERVER-27271&lt;/del&gt;&lt;/a&gt;, and will be included in MongoDB 3.4.1.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
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