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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-20054] Duplicate Key error when trying to start mongos with config rs on empty cluster</title>
                <link>https://jira.mongodb.org/browse/SERVER-20054</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&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;
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					&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;2015-08-19T16:20:40.491-0400 E SHARDING [mongosMain] Error initializing sharding system: DuplicateKey E11000 duplicate key error collection: config.version index: _id_ dup key: { : 1 }&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;I suspect that this is caused by &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;. This can be triggered by multiple mongos trying to start at the same time on an empty cluster and all of them tries to upsert the config.version document at the same time. This was not an issue in the old config servers because we used to take a distributed lock before inserting the new config.version document and now we don&apos;t (since writes will be serialized by the primary and only 1 write will win).&lt;/p&gt;</description>
                <environment></environment>
        <key id="226367">SERVER-20054</key>
            <summary>Duplicate Key error when trying to start mongos with config rs on empty cluster</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="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                    </labels>
                <created>Wed, 19 Aug 2015 22:14:24 +0000</created>
                <updated>Wed, 25 Jan 2017 22:00:15 +0000</updated>
                            <resolved>Tue, 1 Sep 2015 19:47:10 +0000</resolved>
                                    <version>3.1.6</version>
                                    <fixVersion>3.1.8</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1019784" author="xgen-internal-githook" created="Tue, 1 Sep 2015 19:45:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;renctan&apos;, u&apos;name&apos;: u&apos;Randolph Tan&apos;, u&apos;email&apos;: u&apos;randolph@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20054&quot; title=&quot;Duplicate Key error when trying to start mongos with config rs on empty cluster&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20054&quot;&gt;&lt;del&gt;SERVER-20054&lt;/del&gt;&lt;/a&gt; Duplicate Key error when trying to start mongos with config rs on empty cluster&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fc05f77386b3a3ae9bea4c3c89447947f38b37b9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fc05f77386b3a3ae9bea4c3c89447947f38b37b9&lt;/a&gt;&lt;/p&gt;</comment>
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