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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-16262] WriteConflict during concurrent map-reduce operations in WT</title>
                <link>https://jira.mongodb.org/browse/SERVER-16262</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Happens when using the &quot;reduce&quot; action to combine the results of multiple threads into the same collection.&lt;/p&gt;

&lt;p/&gt;
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&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;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;mr failed, removing collection :: caused by :: WriteConflict&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 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;Uncaught std::exception: std::exception, terminating&lt;/span&gt;&lt;/pre&gt;
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                <environment></environment>
        <key id="170599">SERVER-16262</key>
            <summary>WriteConflict during concurrent map-reduce operations in WT</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="9">Done</resolution>
                                        <assignee username="geert.bosch@mongodb.com">Geert Bosch</assignee>
                                    <reporter username="max.hirschhorn@mongodb.com">Max Hirschhorn</reporter>
                        <labels>
                            <label>28qa</label>
                            <label>wiredtiger</label>
                    </labels>
                <created>Fri, 21 Nov 2014 04:31:13 +0000</created>
                <updated>Thu, 18 Dec 2014 23:47:21 +0000</updated>
                            <resolved>Mon, 15 Dec 2014 22:02:25 +0000</resolved>
                                    <version>2.8.0-rc0</version>
                                    <fixVersion>2.8.0-rc3</fixVersion>
                                    <component>Concurrency</component>
                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="787161" author="xgen-internal-githook" created="Tue, 16 Dec 2014 17:10:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;GeertBosch&apos;, u&apos;name&apos;: u&apos;Geert Bosch&apos;, u&apos;email&apos;: u&apos;geert@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16262&quot; title=&quot;WriteConflict during concurrent map-reduce operations in WT&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16262&quot;&gt;&lt;del&gt;SERVER-16262&lt;/del&gt;&lt;/a&gt;: Add test case for Map/Reduce WriteConflict&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/35d89db03ecb922e3b43a1b1f8f0aaab3794d87f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/35d89db03ecb922e3b43a1b1f8f0aaab3794d87f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="786567" author="geert.bosch" created="Mon, 15 Dec 2014 22:02:25 +0000"  >&lt;p&gt;This was fixed as a side effect of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16429&quot; title=&quot;Concurrent mapReduces with same replacement collection fail with WT&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16429&quot;&gt;&lt;del&gt;SERVER-16429&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="786566" author="geert.bosch" created="Mon, 15 Dec 2014 22:01:31 +0000"  >&lt;p&gt;This was fixed by: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16429&quot; title=&quot;Concurrent mapReduces with same replacement collection fail with WT&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16429&quot;&gt;&lt;del&gt;SERVER-16429&lt;/del&gt;&lt;/a&gt; Add ScopedTransaction to AutoGetCollectionForRead and Map-reduce.&lt;/p&gt;</comment>
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