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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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            <title>[SERVER-76552] Skip taking CSSLock when acquiring CSS on non-shardsvr nodes</title>
                <link>https://jira.mongodb.org/browse/SERVER-76552</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-69435&quot; title=&quot;Make the CSS acquisition a RAII&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-69435&quot;&gt;&lt;del&gt;SERVER-69435&lt;/del&gt;&lt;/a&gt; changed the CollectionShardingState acquisition to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/788248b98798044e325f30402ec3812a80dfbaf1/src/mongo/db/s/collection_sharding_state.cpp#L161&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;always take the CSSLock&lt;/a&gt;, rather than taking it later when accessing some of it&apos;s data (e.g. checking the shardVersion, getting the collection description). On non-shardsvrs, accessing the CSS data &lt;a href=&quot;https://github.com/mongodb/mongo/blob/788248b98798044e325f30402ec3812a80dfbaf1/src/mongo/db/s/collection_sharding_state_factory_standalone.cpp#L58&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;didn&apos;t even take the CSSLock&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;After &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-69435&quot; title=&quot;Make the CSS acquisition a RAII&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-69435&quot;&gt;&lt;del&gt;SERVER-69435&lt;/del&gt;&lt;/a&gt;, the CSSLock is taken at acquisition time, both for shard and non-shard servers. This caused performance regression on non-sharded deployments. Since for non-sharded deployments the CSSLock is not really necessary, we can skip it and improve  performance.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="2324812">SERVER-76552</key>
            <summary>Skip taking CSSLock when acquiring CSS on non-shardsvr nodes</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</assignee>
                                    <reporter username="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</reporter>
                        <labels>
                    </labels>
                <created>Wed, 26 Apr 2023 14:56:58 +0000</created>
                <updated>Sun, 29 Oct 2023 21:22:27 +0000</updated>
                            <resolved>Fri, 28 Apr 2023 08:07:49 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                    <fixVersion>7.0.0-rc1</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5393369" author="xgen-internal-githook" created="Tue, 2 May 2023 10:36:29 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Serra Torrens&apos;, &apos;email&apos;: &apos;jordi.serra-torrens@mongodb.com&apos;, &apos;username&apos;: &apos;jordist&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76552&quot; title=&quot;Skip taking CSSLock when acquiring CSS on non-shardsvr nodes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76552&quot;&gt;&lt;del&gt;SERVER-76552&lt;/del&gt;&lt;/a&gt; Skip taking CSSLock when acquiring CSS on non-shardsvr nodes&lt;br/&gt;
Branch: v7.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6dcc2e48765c4b560b052c8fa9e04ee32de12f96&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6dcc2e48765c4b560b052c8fa9e04ee32de12f96&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5380712" author="xgen-internal-githook" created="Thu, 27 Apr 2023 12:20:23 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Serra Torrens&apos;, &apos;email&apos;: &apos;jordi.serra-torrens@mongodb.com&apos;, &apos;username&apos;: &apos;jordist&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76552&quot; title=&quot;Skip taking CSSLock when acquiring CSS on non-shardsvr nodes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76552&quot;&gt;&lt;del&gt;SERVER-76552&lt;/del&gt;&lt;/a&gt; Skip taking CSSLock when acquiring CSS on non-shardsvr nodes&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e56fac94f9aba4c3277cd07100eff86a457e49e1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e56fac94f9aba4c3277cd07100eff86a457e49e1&lt;/a&gt;&lt;/p&gt;</comment>
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