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    <title>MongoDB Jira</title>
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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-21948] DuplicateKeyError during upsert</title>
                <link>https://jira.mongodb.org/browse/SERVER-21948</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hi,&lt;/p&gt;

&lt;p&gt;this error is very rare (I cannot reproduce it), it happens on production every one-two hours (operation which cause this errors have rate ~100/s).&lt;/p&gt;

&lt;p&gt;I read about this issue but every topic I found is about multiple unique indexes which isn&apos;t the case here.&lt;/p&gt;

&lt;p&gt;My collection has one unique index (&lt;tt&gt;_id&lt;/tt&gt;), two regular ones and one Map Field(EmbededDocumentField).&lt;/p&gt;

&lt;p&gt;I think these issues started after upgrading Mongo to 3.0 and WiredTiger engine.&lt;/p&gt;

&lt;p&gt;Current setup:&lt;br/&gt;
MongoDB 3.0.8&lt;br/&gt;
PyMongo 3.2.0&lt;/p&gt;

&lt;p&gt;Sample query which causing issue:&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;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;  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;collection.update({&apos;_id&apos;: &apos;9737600500733084563&apos;}, {&apos;$inc&apos;: {&apos;fields.123.counters.33&apos; : 1}}, upsert=True)&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="244460">SERVER-21948</key>
            <summary>DuplicateKeyError during upsert</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="5" iconUrl="https://jira.mongodb.org/images/icons/priorities/trivial.svg">Trivial - P5</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="mateuszm">Mateusz Moneta</reporter>
                        <labels>
                    </labels>
                <created>Fri, 18 Dec 2015 11:24:49 +0000</created>
                <updated>Fri, 18 Dec 2015 16:51:06 +0000</updated>
                            <resolved>Fri, 18 Dec 2015 16:50:17 +0000</resolved>
                                    <version>3.0.8</version>
                                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1118283" author="kaloian.manassiev" created="Fri, 18 Dec 2015 16:49:56 +0000"  >&lt;p&gt;Hi Mateusz,&lt;/p&gt;

&lt;p&gt;This is duplicate 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; and as of now the error is expected. Please see the mongodb &lt;a href=&quot;https://docs.mongodb.org/v3.0/reference/method/db.collection.update/#use-unique-indexes&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;upsert&lt;/a&gt; documentation for more information on how to handle this. In particular, this part:&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;If the operation fails because of a duplicate index key error, applications may retry the operation which will succeed as an update operation.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;-Kal.&lt;/p&gt;</comment>
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