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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-45850] Remove mutex guards on read access for _shardId and _clusterId in ShardingState</title>
                <link>https://jira.mongodb.org/browse/SERVER-45850</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The ShardingState mutex guard for data read access on these variables is unnecessary, due to existing invariants that:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/695146e648e032e04d97bb0b4de873272c242f04/src/mongo/db/s/sharding_state.cpp#L61&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Prevent the ShardingState from being initialized twice. &lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/695146e648e032e04d97bb0b4de873272c242f04/src/mongo/db/s/sharding_state.cpp#L113&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Prevent the ShardingState&apos;s state variables (_shardId, _clusterId) from being accessed before initialization. &lt;/a&gt;&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Removing these read access mutex acquisitions will reverse the performance drop found in BF-16012.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1120749">SERVER-45850</key>
            <summary>Remove mutex guards on read access for _shardId and _clusterId in ShardingState</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="13201">Fixed</resolution>
                                        <assignee username="blake.oler@mongodb.com">Blake Oler</assignee>
                                    <reporter username="blake.oler@mongodb.com">Blake Oler</reporter>
                        <labels>
                    </labels>
                <created>Wed, 29 Jan 2020 21:17:53 +0000</created>
                <updated>Sun, 29 Oct 2023 22:12:45 +0000</updated>
                            <resolved>Wed, 5 Feb 2020 16:31:46 +0000</resolved>
                                                    <fixVersion>4.3.4</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="2784951" author="xgen-internal-githook" created="Wed, 5 Feb 2020 16:07:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;BlakeIsBlake&apos;, &apos;name&apos;: &apos;Blake Oler&apos;, &apos;email&apos;: &apos;blake.oler@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45850&quot; title=&quot;Remove mutex guards on read access for _shardId and _clusterId in ShardingState&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45850&quot;&gt;&lt;del&gt;SERVER-45850&lt;/del&gt;&lt;/a&gt; Remove mutex guards on read access for _shardId and _clusterId in ShardingState&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3114642e2e211fadcbed1b41d13c9f9423a4e27f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3114642e2e211fadcbed1b41d13c9f9423a4e27f&lt;/a&gt;&lt;/p&gt;</comment>
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