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    <title>MongoDB Jira</title>
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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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<item>
            <title>[SERVER-16905] Concurrent upserts to the same non-existing document can result in duplicate key error</title>
                <link>https://jira.mongodb.org/browse/SERVER-16905</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A test program that starts five threads, each repeatedly upserting a document with the same _id to a collection that doesn&apos;t initially contain a document with that _id, will encounter duplicate key errors on the first attempt from 0-4 of the five threads, depending on timing.&lt;/p&gt;
</description>
                <environment>2.8.0-rc5, wiredTiger storage engine only</environment>
        <key id="179211">SERVER-16905</key>
            <summary>Concurrent upserts to the same non-existing document can result in duplicate key error</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="jeff.yemin@mongodb.com">Jeffrey Yemin</reporter>
                        <labels>
                    </labels>
                <created>Fri, 16 Jan 2015 19:08:54 +0000</created>
                <updated>Mon, 14 Sep 2015 18:14:48 +0000</updated>
                            <resolved>Fri, 16 Jan 2015 19:19:42 +0000</resolved>
                                    <version>2.8.0-rc5</version>
                                                    <component>Concurrency</component>
                    <component>Write Ops</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="806718" author="scotthernandez" created="Fri, 16 Jan 2015 19:19:42 +0000"  >&lt;p&gt;dup of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-14322&quot; title=&quot;Retry on predicate unique index violations of update + upsert -&amp;gt; insert when possible&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14322&quot;&gt;&lt;del&gt;SERVER-14322&lt;/del&gt;&lt;/a&gt;, or a variation of that.&lt;/p&gt;</comment>
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                            <customfieldvalue>&lt;p&gt;Run the Java code from this gist: &lt;a href=&quot;https://gist.github.com/anonymous/5221f3025b549a708299&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://gist.github.com/anonymous/5221f3025b549a708299&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Expected result:&lt;/p&gt;

&lt;p&gt;One thread will &quot;win&quot; and be the one to insert the document.  The rest will see the insert and just update the existing document.&lt;/p&gt;

&lt;p&gt;Actual result:&lt;/p&gt;

&lt;p&gt;Depending on timing, there are 0-4 exceptions thrown indicating a duplicate key error.&lt;/p&gt;
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