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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>[SERVER-85636] Poor FTDC compression due to apparent schema change observed on 7.3.0-alpha1</title>
                <link>https://jira.mongodb.org/browse/SERVER-85636</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Environment&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;MongoDB 7.3.0-alpha1&lt;/li&gt;
	&lt;li&gt;Single node replica set&lt;/li&gt;
	&lt;li&gt;macOS&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Happened to observe that a new 10MB FTDC file was being rolled every 8 minutes instead of the more typical 4-8 hours.&lt;/p&gt;

&lt;p&gt;Based on some internal discussion this is thought to be caused by frequent schema changes brought on by a separate memory optimization. &lt;/p&gt;

&lt;p&gt;This is apparently trivially reproducible on linux. Example logs from a linux repro:&lt;/p&gt;
&lt;p/&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="2554850">SERVER-85636</key>
            <summary>Poor FTDC compression due to apparent schema change observed on 7.3.0-alpha1</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="13201">Fixed</resolution>
                                        <assignee username="henrik.edin@mongodb.com">Henrik Edin</assignee>
                                    <reporter username="john.morales@mongodb.com">John Morales</reporter>
                        <labels>
                    </labels>
                <created>Tue, 23 Jan 2024 22:09:02 +0000</created>
                <updated>Wed, 24 Jan 2024 15:40:03 +0000</updated>
                            <resolved>Wed, 24 Jan 2024 15:40:03 +0000</resolved>
                                                    <fixVersion>8.0.0-rc0</fixVersion>
                    <fixVersion>7.3.0-rc1</fixVersion>
                                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="6037984" author="henrik.edin" created="Wed, 24 Jan 2024 15:40:03 +0000"  >&lt;p&gt;Fixed by reverting &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80290&quot; title=&quot;Change WiredTigerUtil::exportTableToBSON to use StringMap&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80290&quot;&gt;&lt;del&gt;SERVER-80290&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
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