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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-56195] Make TTL monitor multi-threaded</title>
                <link>https://jira.mongodb.org/browse/SERVER-56195</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;TTL deletes are limited by a single-threaded background task. This can be problematic in very large instances with many TTL indexes and can result in a situation where the TTL monitor cannot keep up with new writes.&lt;/p&gt;

&lt;p&gt;Consider redesigning the TTL Monitor to dispatch fix-sized deletion batches to an appropriately-sized thread pool (some constant factor of the number of available cores). This would likely be done in combination with &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56194&quot; title=&quot;Make TTL deletes fair&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56194&quot;&gt;&lt;del&gt;SERVER-56194&lt;/del&gt;&lt;/a&gt; to limit the number of deletes per collection and also reduce the interval between TTL passes.&lt;/p&gt;

&lt;p&gt;Note that TTL deletes are very impactful on WT, so we should be very careful to evaluate the performance consequences of performing a higher volume of TTL deletions.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1683965">SERVER-56195</key>
            <summary>Make TTL monitor multi-threaded</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
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                <created>Tue, 20 Apr 2021 14:50:59 +0000</created>
                <updated>Thu, 11 Jan 2024 19:17:49 +0000</updated>
                                                                                                <votes>0</votes>
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