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    <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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            <title>[SERVER-8516] unique index allowed insertion of duplicate</title>
                <link>https://jira.mongodb.org/browse/SERVER-8516</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A duplicate document somehow made it into a collection with a unique index.  I did not discover that this occurred for some time &amp;#8211; after an ensureIndex call on the collection failed.  Both inserts occurred at about the same time &amp;#8211; the timestamps for their respective ObjectId&apos;s are equivalent.  What is strange is that two inserts were not actually executed against the collection, yet somehow two duplicate records ended up in the collection.  &lt;/p&gt;</description>
                <environment>Amazon ec2 server using Ubuntu 12.04.1 LTS and EBS </environment>
        <key id="64902">SERVER-8516</key>
            <summary>unique index allowed insertion of duplicate</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="-1">Unassigned</assignee>
                                    <reporter username="danieldkim">Daniel Kim</reporter>
                        <labels>
                    </labels>
                <created>Mon, 11 Feb 2013 21:49:29 +0000</created>
                <updated>Fri, 15 Feb 2013 15:05:42 +0000</updated>
                            <resolved>Tue, 12 Feb 2013 18:06:29 +0000</resolved>
                                    <version>2.2.2</version>
                                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="264272" author="danieldkim" created="Tue, 12 Feb 2013 18:05:31 +0000"  >&lt;p&gt;Hi Scott,&lt;/p&gt;

&lt;p&gt;Thanks for the timely response.  After I restored a backup to get a dump and looked through the mongo logs I discovered that the collection in question did not actually have the appropriate unique index.  My system always ensures indices on startup but I forgot that I had dropped the database at some point after starting up and before a test run and had never rebuilt the indices.  I apologize for the false alarm!  It was a long day ...&lt;/p&gt;

&lt;p&gt;-dk&lt;/p&gt;</comment>
                            <comment id="263721" author="scotthernandez" created="Tue, 12 Feb 2013 02:07:09 +0000"  >&lt;p&gt;Can you please provide the documents (mongodump would be best), index definitions (system.indexes entries) and conditions you believe caused this state?&lt;/p&gt;

&lt;p&gt;Please also describe your mongodb deployment; is it a replic set, sharded cluster or just a single server including versions and updated/orig versions.&lt;/p&gt;</comment>
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