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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-23594] Add option to specify TCMalloc statistics verbosity in FTDC</title>
                <link>https://jira.mongodb.org/browse/SERVER-23594</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;After &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23409&quot; title=&quot;Add tunability to tcmalloc serverStatus detail&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23409&quot;&gt;&lt;del&gt;SERVER-23409&lt;/del&gt;&lt;/a&gt;, it will be possible to customize the verbosity of the TCMalloc section of &lt;tt&gt;serverStatus&lt;/tt&gt;. We should add a &lt;tt&gt;setParameter&lt;/tt&gt; option to allow FTDC to take advantage of this &amp;#8211; right now, it&apos;s hard coded to do&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;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;db.serverStatus( { tcmalloc: true } )&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;h5&gt;&lt;a name=&quot;OriginalDescription&quot;&gt;&lt;/a&gt;Original Description&lt;/h5&gt;

&lt;p&gt;The tcmalloc freelist statistics introduced by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23069&quot; title=&quot;Improve tcmalloc freelist statistics&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23069&quot;&gt;&lt;del&gt;SERVER-23069&lt;/del&gt;&lt;/a&gt; are very useful for debugging memory issues, but they have a large impact on diagnostic data capture. Here is the impact on (compressed) sample size and retention period (with the default 100 MB diagnostic data capture size) for a 10 minute run of a busy 1-node replica set:&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;      &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;3.2 (no tcamlloc stats) - 270 bytes/sample - 4.2 days / 100 MB&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;3.3 (w/ tcmalloc stats) - 426 bytes/sample - 2.7 days / 100 MB&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;This seems unlike to be useful for diagnosing issues in the field, so the large impact on retention period isn&apos;t warranted, so the detailed tcmalloc stats shouldn&apos;t be included in diagnostic data capture by default.&lt;/p&gt;

&lt;p&gt;Some options:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;make it optional as suggested in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23409&quot; title=&quot;Add tunability to tcmalloc serverStatus detail&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23409&quot;&gt;&lt;del&gt;SERVER-23409&lt;/del&gt;&lt;/a&gt; and exclude it from diagnostic data capture&lt;/li&gt;
	&lt;li&gt;remove it from the result of serverStatus before packaging it up for diagnostic data capture&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Whatever approach to exclude it by default from diagnostic data capture, it might still be a good idea to have an option to included it in diagnostic data capture for special customer debugging scenarios. &lt;/p&gt;</description>
                <environment></environment>
        <key id="278136">SERVER-23594</key>
            <summary>Add option to specify TCMalloc statistics verbosity in FTDC</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="3">Duplicate</resolution>
                                        <assignee username="mark.benvenuto@mongodb.com">Mark Benvenuto</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                            <label>move-sec</label>
                            <label>platforms-re-triaged</label>
                    </labels>
                <created>Thu, 7 Apr 2016 11:21:55 +0000</created>
                <updated>Tue, 1 Sep 2020 21:38:06 +0000</updated>
                            <resolved>Tue, 1 Sep 2020 21:38:06 +0000</resolved>
                                    <version>3.3.4</version>
                                                    <component>Diagnostics</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1385833" author="mark.benvenuto" created="Thu, 15 Sep 2016 21:59:35 +0000"  >&lt;p&gt;Since the verbose tcmalloc statistics in serverStatus are optional, and may be useful to debug certain issues, it would be nice for FTDC to capture them. This is the intent of the ticket since the verbose tcmalloc statistics are no longer on by default.&lt;/p&gt;</comment>
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                <issuelinks>
                            <issuelinktype id="10010">
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            <issuekey id="1357377">SERVER-48324</issuekey>
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                    <name>Related</name>
                                                                <inwardlinks description="is related to">
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            <issuekey id="271585">SERVER-23069</issuekey>
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