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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>[DOCS-15885] Investigate changes in SERVER-71678: Allow compact to run on system collections</title>
                <link>https://jira.mongodb.org/browse/DOCS-15885</link>
                <project id="10380" key="DOCS">Documentation</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&gt;
&lt;p&gt;    It is now possible to run compact on a system collection. &lt;/p&gt;

&lt;p&gt;Interestingly, it appears that the docs for the compact command already incorrectly state this is possible, dating back as far as at least 4.2 (&quot;For system collections....&quot;): &lt;a href=&quot;https://www.mongodb.com/docs/v4.2/reference/command/compact/#compact-required-privileges&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://www.mongodb.com/docs/v4.2/reference/command/compact/#compact-required-privileges&lt;/a&gt; &lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    System collections can&apos;t be compacted:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// Items in system.* cannot be moved as there might be pointers to them.&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;uassert(ErrorCodes::InvalidNamespace, &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;can&apos;t compact a system namespace&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;, !nss.isSystem());&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;This restriction was added in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-11595&quot; title=&quot;Re-implement parallel index build for compact&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-11595&quot;&gt;&lt;del&gt;SERVER-11595&lt;/del&gt;&lt;/a&gt; and is likely an MMAP limitation. With WiredTiger being the default storage engine, this is no longer necessary as WiredTiger supports online compaction.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="2255400">DOCS-15885</key>
            <summary>Investigate changes in SERVER-71678: Allow compact to run on system collections</summary>
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                                            <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="corry.root@mongodb.com">Corry Root</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Tue, 7 Feb 2023 18:19:46 +0000</created>
                <updated>Mon, 13 Nov 2023 17:35:52 +0000</updated>
                            <resolved>Wed, 2 Aug 2023 13:19:07 +0000</resolved>
                                    <version>7.0.0-rc0</version>
                                    <fixVersion>7.0.0-rc0</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
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                            <customfieldvalue>It is now possible to run compact on a system collection. &lt;br/&gt;
&lt;br/&gt;
Interestingly, it appears that the docs for the compact command already incorrectly state this is possible, dating back as far as at least 4.2 (&amp;quot;For system collections....&amp;quot;): &lt;a href=&quot;https://www.mongodb.com/docs/v4.2/reference/command/compact/#compact-required-privileges&quot;&gt;https://www.mongodb.com/docs/v4.2/reference/command/compact/#compact-required-privileges&lt;/a&gt; </customfieldvalue>

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