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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-18147] Take distributed lock on database creation</title>
                <link>https://jira.mongodb.org/browse/SERVER-18147</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There is a race condition if two different mongoses (or even two connections to the same mongos) try to create a database at the same time.  Poor timing can make the mongos receive a &quot;config write inconsistent&quot; error when writing the config.databases entry where the insert is successful on 1 or more config servers but fails with a duplicate key error on 1 or more other config servers because the simultaneous db creation got there first.&lt;/p&gt;

&lt;p&gt;We didn&apos;t do this previously because of the way mongos was written wrt implicit database creation made it difficult to avoid taking the dist lock on every write event.  With the new catalog refactor we&apos;ve separated out implicit database creation so now it should be possible to take the distlock only when actually needed&lt;/p&gt;</description>
                <environment></environment>
        <key id="199122">SERVER-18147</key>
            <summary>Take distributed lock on database creation</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="spencer@mongodb.com">Spencer Brody</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                    </labels>
                <created>Mon, 20 Apr 2015 21:56:57 +0000</created>
                <updated>Wed, 25 Jan 2017 22:01:00 +0000</updated>
                            <resolved>Tue, 21 Apr 2015 15:18:29 +0000</resolved>
                                                    <fixVersion>3.1.2</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="893880" author="xgen-internal-githook" created="Tue, 21 Apr 2015 15:13:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;stbrody&apos;, u&apos;name&apos;: u&apos;Spencer T Brody&apos;, u&apos;email&apos;: u&apos;spencer@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-18147&quot; title=&quot;Take distributed lock on database creation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-18147&quot;&gt;&lt;del&gt;SERVER-18147&lt;/del&gt;&lt;/a&gt; Take distributed lock on database creation&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1b3a27a722319094d0b5683ff28bce22922bcc0a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1b3a27a722319094d0b5683ff28bce22922bcc0a&lt;/a&gt;&lt;/p&gt;</comment>
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