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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-20769] Remove global X lock from setShardVersion while initializing ShardingState</title>
                <link>https://jira.mongodb.org/browse/SERVER-20769</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When setShardVersion is initializing the global sharding state it does so while holding an exclusive lock: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/s/set_shard_version_command.cpp#L361&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/src/mongo/db/s/set_shard_version_command.cpp#L361&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;ShardingState initialization, however, can perform network traffic.  Holding the exclusive lock while performing network traffic is a bad idea for several reasons, including that it can block stepdown and promotion to primary.&lt;/p&gt;

&lt;p&gt;We should figure out why it&apos;s holding the global lock at all, and if there&apos;s no need we should remove it.&lt;/p&gt;</description>
                <environment></environment>
        <key id="232911">SERVER-20769</key>
            <summary>Remove global X lock from setShardVersion while initializing ShardingState</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, 5 Oct 2015 21:49:48 +0000</created>
                <updated>Wed, 25 Jan 2017 21:59:56 +0000</updated>
                            <resolved>Fri, 9 Oct 2015 15:26:45 +0000</resolved>
                                                    <fixVersion>3.2.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1056626" author="xgen-internal-githook" created="Fri, 9 Oct 2015 15:26:03 +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-20769&quot; title=&quot;Remove global X lock from setShardVersion while initializing ShardingState&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20769&quot;&gt;&lt;del&gt;SERVER-20769&lt;/del&gt;&lt;/a&gt; Remove global lock from setShardVersion&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a16c8abbb18c6f12346ca8ab8b0316ff5e04034b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a16c8abbb18c6f12346ca8ab8b0316ff5e04034b&lt;/a&gt;&lt;/p&gt;</comment>
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