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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-40168] Pull the OplogTruncaterThread out of WiredTigerKVEngine and put it above the storage layer</title>
                <link>https://jira.mongodb.org/browse/SERVER-40168</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The OplogTruncaterThread will still call into the storage engine, but it&apos;s logic does not need to exist in that layer.&lt;/p&gt;

&lt;p&gt;Replication should control&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;whether to start the thread&lt;/li&gt;
	&lt;li&gt;when to start the thread&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Currently starting the OplogTruncaterThread is a byproduct of creating a local.oplog.* collection record store. That special logic can go away.&lt;/p&gt;

&lt;p&gt;The WiredTigerKVRecordStore currently depends on the OplogTruncaterThread to initialize the OplogStones logic, which then pivots from the regular capped collection clean up process to the OplogStones variation. The storage layer will need some other indicator &amp;#8211; ideally a generic one &amp;#8211; to signal use of the OplogStones.&lt;/p&gt;</description>
                <environment></environment>
        <key id="717515">SERVER-40168</key>
            <summary>Pull the OplogTruncaterThread out of WiredTigerKVEngine and put it above the storage layer</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="9">Done</resolution>
                                        <assignee username="gabe.villasana@mongodb.com">Gabriel Villasana</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Fri, 15 Mar 2019 18:13:25 +0000</created>
                <updated>Thu, 10 Oct 2019 22:06:02 +0000</updated>
                            <resolved>Thu, 11 Jul 2019 15:43:44 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="2476683" author="xgen-internal-githook" created="Thu, 10 Oct 2019 22:06:02 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Maria van Keulen&apos;, &apos;username&apos;: &apos;mvankeulen94&apos;, &apos;email&apos;: &apos;maria.vankeulen@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43322&quot; title=&quot;Add tracking tools for measuring OplogStones performance&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43322&quot;&gt;&lt;del&gt;SERVER-43322&lt;/del&gt;&lt;/a&gt; Add tunable oplog stone sizes and track truncation speeds&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 294a8f68615710b47936d5ee42439d01538ac746)&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43322&quot; title=&quot;Add tracking tools for measuring OplogStones performance&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43322&quot;&gt;&lt;del&gt;SERVER-43322&lt;/del&gt;&lt;/a&gt; Disallow oplog_sampling.js on inMemory storage enigne&lt;/p&gt;

&lt;p&gt;(cherry picked from commit b35dd89515473c97a87b3c06897e8a7ab51c93cc)&lt;/p&gt;

&lt;p&gt;This backport was not a straightforward cherry-pick due to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40168&quot; title=&quot;Pull the OplogTruncaterThread out of WiredTigerKVEngine and put it above the storage layer&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40168&quot;&gt;&lt;del&gt;SERVER-40168&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
existing in master and not v4.2.&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/dd819eb95636f47f13638259208ae8a69e48ded7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/dd819eb95636f47f13638259208ae8a69e48ded7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2321234" author="xgen-internal-githook" created="Thu, 11 Jul 2019 15:42:03 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gabe Villasana&apos;, &apos;username&apos;: &apos;villagab4&apos;, &apos;email&apos;: &apos;villagab4@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40168&quot; title=&quot;Pull the OplogTruncaterThread out of WiredTigerKVEngine and put it above the storage layer&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40168&quot;&gt;&lt;del&gt;SERVER-40168&lt;/del&gt;&lt;/a&gt; Pull the OplogTruncaterThread out of WiredTigerKVEngine and put it above the storage layer&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/commit/702f9f21105675bc23e26d80e719a55206601913&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo-enterprise-modules/commit/702f9f21105675bc23e26d80e719a55206601913&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2321224" author="xgen-internal-githook" created="Thu, 11 Jul 2019 15:37:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gabe Villasana&apos;, &apos;username&apos;: &apos;villagab4&apos;, &apos;email&apos;: &apos;villagab4@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40168&quot; title=&quot;Pull the OplogTruncaterThread out of WiredTigerKVEngine and put it above the storage layer&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40168&quot;&gt;&lt;del&gt;SERVER-40168&lt;/del&gt;&lt;/a&gt; Pull the OplogTruncaterThread out of WiredTigerKVEngine and put it above the storage layer&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d9b6940984db00c428441139a33f19b207e35f30&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d9b6940984db00c428441139a33f19b207e35f30&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                            <outwardlinks description="duplicates">
                                        <issuelink>
            <issuekey id="639635">SERVER-38296</issuekey>
        </issuelink>
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                            <issuelinktype id="10012">
                    <name>Related</name>
                                                                <inwardlinks description="is related to">
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            <issuekey id="717590">SERVER-40173</issuekey>
        </issuelink>
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