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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-74427] Refactor lifetime of OplogCapMaintainerThread</title>
                <link>https://jira.mongodb.org/browse/SERVER-74427</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Right now the thread gets spawned with a raw &lt;tt&gt;new&lt;/tt&gt; and the pointer &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c0f9f5c10f68e89bb11f0c75bc9e7525dd668656/src/mongo/db/repl/storage_interface_impl.cpp#L1416&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;goes out of scope&lt;/a&gt; without ever being {{delete}}d.&lt;/p&gt;

&lt;p&gt;This is a literal memory leak that&apos;s harmless since it should only ever be deleted during shutdown. Nonetheless, we could refactor the code so at least it&apos;s lifetime is tied to the service context via a &lt;tt&gt;unique_ptr&lt;/tt&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2276933">SERVER-74427</key>
            <summary>Refactor lifetime of OplogCapMaintainerThread</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="jordi.olivares-provencio@mongodb.com">Jordi Olivares Provencio</assignee>
                                    <reporter username="jordi.olivares-provencio@mongodb.com">Jordi Olivares Provencio</reporter>
                        <labels>
                            <label>techdebt</label>
                    </labels>
                <created>Tue, 28 Feb 2023 09:53:55 +0000</created>
                <updated>Sun, 29 Oct 2023 21:25:38 +0000</updated>
                            <resolved>Mon, 3 Apr 2023 10:44:58 +0000</resolved>
                                                    <fixVersion>7.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="5318664" author="xgen-internal-githook" created="Mon, 3 Apr 2023 09:47:49 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Olivares Provencio&apos;, &apos;email&apos;: &apos;jordi.olivares-provencio@mongodb.com&apos;, &apos;username&apos;: &apos;jordiolivares&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74427&quot; title=&quot;Refactor lifetime of OplogCapMaintainerThread&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74427&quot;&gt;&lt;del&gt;SERVER-74427&lt;/del&gt;&lt;/a&gt; Refactor OplogCapMaintainerThread lifetime&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0d9fbf5838d712c94abd9ee9810444e8d0f8dbcc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0d9fbf5838d712c94abd9ee9810444e8d0f8dbcc&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5305610" author="JIRAUSER1264163" created="Tue, 28 Mar 2023 12:31:16 +0000"  >&lt;p&gt;The thread gets started as a self destructing BackgroundJob that never ends until shutdown. Theoretically this is fine since the thread will return when the server is in shutdown mode and thus self delete itself from the heap, clearing its memory usage.&lt;/p&gt;

&lt;p&gt;The problem with refactoring is that the thread gets blocked waiting inside the CollectionTruncateMarkers notification condition variable. This CV gets woken only if there&apos;s a new marker or the Oplog record store gets deleted. But the latter only happens once the Oplog RecordStore gets deleted during shutdown.&lt;/p&gt;</comment>
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