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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-20453] Samples per chunk is off by one</title>
                <link>https://jira.mongodb.org/browse/SERVER-20453</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;With default max samples per chunk of 300, chunks may actually contain 301 samples.&lt;/p&gt;</description>
                <environment></environment>
        <key id="230203">SERVER-20453</key>
            <summary>Samples per chunk is off by one</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="mark.benvenuto@mongodb.com">Mark Benvenuto</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                            <label>FTDC</label>
                    </labels>
                <created>Thu, 17 Sep 2015 13:30:58 +0000</created>
                <updated>Thu, 15 Oct 2015 19:08:17 +0000</updated>
                            <resolved>Mon, 12 Oct 2015 19:12:42 +0000</resolved>
                                                    <fixVersion>3.2.0-rc0</fixVersion>
                                    <component>Diagnostics</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1050353" author="acm" created="Fri, 2 Oct 2015 22:10:24 +0000"  >&lt;p&gt;This has been fixed, in the sense that it no longer is off by one, but requires further work to address some edge cases.&lt;/p&gt;</comment>
                            <comment id="1048753" author="xgen-internal-githook" created="Thu, 1 Oct 2015 15:38:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;acmorrow&apos;, u&apos;name&apos;: u&apos;Andrew Morrow&apos;, u&apos;email&apos;: u&apos;acm@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20453&quot; title=&quot;Samples per chunk is off by one&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20453&quot;&gt;&lt;del&gt;SERVER-20453&lt;/del&gt;&lt;/a&gt; Count the FTDC reference document as the first sample&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8438163beaf983baa2120ac6705176c2bf1a33e3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8438163beaf983baa2120ac6705176c2bf1a33e3&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1033480" author="bruce.lucas@10gen.com" created="Thu, 17 Sep 2015 19:19:52 +0000"  >&lt;p&gt;The reference document is the first sample, so there should be 1 reference document and 299 deltas for a total of 300 samples.&lt;/p&gt;</comment>
                            <comment id="1033447" author="mark.benvenuto" created="Thu, 17 Sep 2015 19:08:37 +0000"  >&lt;p&gt;The &lt;tt&gt;diagnosticDataCollectionSamplesPerChunk&lt;/tt&gt; parameter controls how many samples are stored in the metric chunk. If you combine all the samples stored in the metric chunk with the reference document, you will get &lt;tt&gt;diagnosticDataCollectionSamplesPerChunk&lt;/tt&gt; + 1 documents after the metric chunk is inflated.&lt;/p&gt;

&lt;p&gt;This is verified by this test:&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/ftdc/compressor_test.cpp#L364-L379&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/src/mongo/db/ftdc/compressor_test.cpp#L364-L379&lt;/a&gt;&lt;/p&gt;</comment>
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