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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-45687] Replace mutex in CollectionShardingRuntime with CSRLock</title>
                <link>https://jira.mongodb.org/browse/SERVER-45687</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/896505a1ee961597277945fe63892d0bbb91f9ad/src/mongo/db/s/collection_sharding_runtime.h#L200&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;This mutex&lt;/a&gt; is redundant and hurts performance and the CSRLock can be used instead.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1107896">SERVER-45687</key>
            <summary>Replace mutex in CollectionShardingRuntime with CSRLock</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="matthew.saltz@mongodb.com">Matthew Saltz</assignee>
                                    <reporter username="matthew.saltz@mongodb.com">Matthew Saltz</reporter>
                        <labels>
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                <created>Tue, 21 Jan 2020 23:13:48 +0000</created>
                <updated>Tue, 18 Feb 2020 18:11:00 +0000</updated>
                            <resolved>Tue, 18 Feb 2020 18:11:00 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2882791" author="matthew.saltz" created="Tue, 18 Feb 2020 18:11:00 +0000"  >&lt;p&gt;After implementing this, it turns out that using a SharedLock on the CSR ResourceMutex was actually &lt;b&gt;worse&lt;/b&gt; for performance, as seen in the run of &lt;a href=&quot;https://evergreen.mongodb.com/task/mongodb_mongo_master_linux_64_debug_display_sharding_auth_patch_542de84ec1e17520bd0d99d54a024ff0e0bc3de2_5e46ea710ae6061b00248a8d_20_02_14_18_44_07##%257B%2522compare%2522%253A%255B%257B%2522hash%2522%253A%2522542de84ec1e17520bd0d99d54a024ff0e0bc3de2%2522%257D%255D%257D&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;bulk_shard_insert.js here&lt;/a&gt; (20 min compared to usual 9 min). In retrospect, this makes sense, since SharedLock in general is much more heavyweight and isn&apos;t particularly useful with short critical sections.&lt;/p&gt;</comment>
                            <comment id="2766203" author="matthew.saltz" created="Mon, 27 Jan 2020 18:27:43 +0000"  >&lt;p&gt;It turns out the major perf hit was due to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45691&quot; title=&quot;Change Mutex::LockListeners to use a std::vector again&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45691&quot;&gt;&lt;del&gt;SERVER-45691&lt;/del&gt;&lt;/a&gt;, so I&apos;ll postpone doing this one for the moment in favor of functionality-adding tickets, but we should do it before releasing.&lt;/p&gt;</comment>
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