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    <title>MongoDB Jira</title>
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    <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>[COMPASS-6215] Investigate changes in PM-3092: Truncate Ranges on Internal Collections</title>
                <link>https://jira.mongodb.org/browse/COMPASS-6215</link>
                <project id="13182" key="COMPASS">Compass </project>
                    <description>    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Original Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    StorE may introduce a new oplog entry&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-color: #cccccc;border-style: dashed;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;border-bottom-style: dashed;border-bottom-color: #cccccc;background-color: #239eb0;&quot;&gt;&lt;b&gt;Epic Summary&lt;/b&gt;&lt;/div&gt;&lt;/div&gt;
&lt;h4&gt;&lt;a name=&quot;Summary&quot;&gt;&lt;/a&gt;Summary&lt;/h4&gt;
&lt;p&gt;Use WiredTiger truncation to delete data on change stream pre/post-images collections and Serverless change collections.&lt;/p&gt;

&lt;h4&gt;&lt;a name=&quot;Motivation&quot;&gt;&lt;/a&gt;Motivation&lt;/h4&gt;
&lt;p&gt;MongoDB maintains internal collections that contain full or partial copies of user data. These collections support features such as pre/post-images for change streams and per-tenant change streams for Serverless. These new collections multiply the amount of data we must insert and delete on each node. Unfortunately, deleting old data is still costly and slow despite improvements made in PM-2227. As a result the tasks that purge expired data may not be able to delete data faster than new data is inserted, which risks clusters running out of disk space. &lt;/p&gt;

&lt;p&gt;WiredTiger has a truncation API that efficiently deletes large ranges of data without having to read everything from disk. Use this new API on these internal collections to delete data.&lt;/p&gt;

&lt;h4&gt;&lt;a name=&quot;Documentation&quot;&gt;&lt;/a&gt;Documentation&lt;/h4&gt;

&lt;p&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;Scope Document|&amp;#93;&lt;/span&gt;&lt;br/&gt;
 &lt;span class=&quot;error&quot;&gt;&amp;#91;Technical Design Document|&amp;#93;&lt;/span&gt;&lt;br/&gt;
 &lt;span class=&quot;error&quot;&gt;&amp;#91;Product Description|&amp;#93;&lt;/span&gt;&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;
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                <environment></environment>
        <key id="2162078">COMPASS-6215</key>
            <summary>Investigate changes in PM-3092: Truncate Ranges on Internal Collections</summary>
                <type id="10501" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Investigation</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="-1">Unassigned</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Wed, 19 Oct 2022 09:35:45 +0000</created>
                <updated>Fri, 3 Nov 2023 13:03:37 +0000</updated>
                            <resolved>Wed, 19 Oct 2022 10:08:24 +0000</resolved>
                                                    <fixVersion>No version</fixVersion>
                                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5852029" author="dbeng-pm-bot" created="Fri, 3 Nov 2023 13:03:37 +0000"  >&lt;p&gt;&lt;em&gt;Fix Version updated for upstream PM-3092:&lt;/em&gt; &lt;br/&gt;
7.2.0&lt;/p&gt;</comment>
                            <comment id="5594733" author="dbeng-pm-bot" created="Thu, 27 Jul 2023 08:54:11 +0000"  >&lt;p&gt;&lt;em&gt;Fix Version updated for upstream PM-3092:&lt;/em&gt; &lt;br/&gt;
7.2 Targeted&lt;/p&gt;</comment>
                            <comment id="5573191" author="dbeng-pm-bot" created="Tue, 18 Jul 2023 08:56:02 +0000"  >&lt;p&gt;&lt;em&gt;Fix Version updated for upstream PM-3092:&lt;/em&gt; &lt;br/&gt;
7.3 Targeted&lt;/p&gt;</comment>
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