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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-73867] Improve logging at compact end</title>
                <link>https://jira.mongodb.org/browse/SERVER-73867</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;On finalizing a collection (and indices) compact call, the amount of freed space is logged &lt;a href=&quot;https://github.com/10gen/mongo/blob/6dad29fa64f0bab3468b18ec784f53027306c8d7/src/mongo/db/catalog/collection_compact.cpp#L131&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;It is possible for compact to actually cause the file size to grow instead of shrink, if there is little free space. This is because compacts also cause checkpoints to happen, which need to grow the file. If the compact operation results in no space reduction, and the checkpoint causes the file to grow, we will have a situation where pre-compact size is smaller than post-compact one.&lt;/p&gt;

&lt;p&gt;Size diff is computed as an unsigned long, so this results in an underflow and a very large number of freed bytes being reported.&lt;/p&gt;

&lt;p&gt;For instance, this can be observed in all runs of compact.js:&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;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;[fsm_workload_test:compact] Fixture status:&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;   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;...&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;[j0] | 2023-02-03T03:45:28.578-05:00 I  STORAGE  20286   [conn850] &quot;Compact end&quot;,&quot;attr&quot;:{&quot;namespace&quot;:&quot;test28_fsmdb0.compact_1&quot;,&quot;freedBytes&quot;:18446744073709441024}...&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2260165">SERVER-73867</key>
            <summary>Improve logging at compact end</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="yujin.kang@mongodb.com">Yujin Kang Park</assignee>
                                    <reporter username="yujin.kang@mongodb.com">Yujin Kang Park</reporter>
                        <labels>
                    </labels>
                <created>Fri, 10 Feb 2023 09:11:19 +0000</created>
                <updated>Sun, 29 Oct 2023 21:26:33 +0000</updated>
                            <resolved>Tue, 28 Feb 2023 13:53:23 +0000</resolved>
                                                    <fixVersion>7.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5235889" author="xgen-internal-githook" created="Tue, 28 Feb 2023 11:37:51 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Yu Jin Kang Park&apos;, &apos;email&apos;: &apos;yujin.kang@mongodb.com&apos;, &apos;username&apos;: &apos;ykangpark&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-73867&quot; title=&quot;Improve logging at compact end&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-73867&quot;&gt;&lt;del&gt;SERVER-73867&lt;/del&gt;&lt;/a&gt; Improve logging at compact end&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2293380500c18cfeb8eaa3d0f1353aae34f799f0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2293380500c18cfeb8eaa3d0f1353aae34f799f0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5197684" author="gregory.noma" created="Tue, 14 Feb 2023 16:35:02 +0000"  >&lt;p&gt;We might want to just report the before/after separately&lt;/p&gt;</comment>
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