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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-53502] Consider introducing fine grained chunk locks</title>
                <link>https://jira.mongodb.org/browse/SERVER-53502</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;With the work done under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53468&quot; title=&quot;Ensure config.chunks stability during upgrade/downgrade&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53468&quot;&gt;&lt;del&gt;SERVER-53468&lt;/del&gt;&lt;/a&gt; it, the global chunk lock can potentially be held for long periods during upgrade/downgrade resulting in chunk operations slowing down or timing out on all collections.&lt;/p&gt;

&lt;p&gt;As an optimization, consider if it would be better to introduce a more fine grained chunk locking mechanism (per collection). The idea is to synchronize the access to subsets of documents of &lt;tt&gt;config.chunks&lt;/tt&gt; that contains the chunk entries for all namespaces.&lt;/p&gt;</description>
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        <key id="1576788">SERVER-53502</key>
            <summary>Consider introducing fine grained chunk locks</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
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                <created>Wed, 23 Dec 2020 09:20:52 +0000</created>
                <updated>Tue, 6 Dec 2022 01:40:51 +0000</updated>
                            <resolved>Thu, 7 Jan 2021 13:43:37 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
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                            <comment id="3552399" author="kaloian.manassiev" created="Thu, 7 Jan 2021 13:43:37 +0000"  >&lt;p&gt;Instead of just reducing the granularity of chunk locks, we should do that entire work when we switch the update of the routing information to use transactions instead of &lt;tt&gt;applyOps&lt;/tt&gt; as tracked in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33326&quot; title=&quot;Remove use of applyOps/doTxn from sharding chunk operations&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33326&quot;&gt;&lt;del&gt;SERVER-33326&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
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