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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-16261] Make insert on update (upsert: true) atomic with query + insert</title>
                <link>https://jira.mongodb.org/browse/SERVER-16261</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The update operation (with upsert:true) is not currently atomic, for both the query + resulting insert. In highly active environments this will results in duplicated documents or an error due to unique index constraints.&lt;/p&gt;

&lt;p&gt;The preferred behavior is that all updates will insert a new document or update the existing one, and not result in duplicate documents.&lt;/p&gt;</description>
                <environment></environment>
        <key id="170592">SERVER-16261</key>
            <summary>Make insert on update (upsert: true) atomic with query + insert</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="lubinwang">lubinwang</reporter>
                        <labels>
                            <label>duplicates</label>
                            <label>insert</label>
                            <label>update</label>
                            <label>upsert</label>
                    </labels>
                <created>Fri, 21 Nov 2014 01:50:20 +0000</created>
                <updated>Fri, 26 Apr 2019 13:32:53 +0000</updated>
                            <resolved>Fri, 21 Nov 2014 16:22:08 +0000</resolved>
                                                                    <component>Write Ops</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="2225869" author="ian@10gen.com" created="Fri, 26 Apr 2019 13:32:53 +0000"  >&lt;p&gt;Switching &quot;Drivers Changes Needed&quot; from &quot;Maybe&quot; to &quot;Not Needed&quot; since this was closed as something other than Fixed.&lt;/p&gt;</comment>
                            <comment id="769886" author="scotthernandez" created="Fri, 21 Nov 2014 12:07:20 +0000"  >&lt;p&gt;The documentation here covers the expected and current behavior: &lt;a href=&quot;http://docs.mongodb.org/manual/reference/method/db.collection.update/#use-unique-indexes&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/reference/method/db.collection.update/#use-unique-indexes&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;While conceptually it would be possible to implement a change like this it would require dramatic changes to performance and the scale of locking needed to ensure no duplicates are created. Due to this extreme cost it is hard to see this as a viable behavioral change nor a good one.&lt;/p&gt;</comment>
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