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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-34717] Performance regression in dropDatabase</title>
                <link>https://jira.mongodb.org/browse/SERVER-34717</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p/&gt;
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&lt;p/&gt;

&lt;p&gt;Time required for dropDatabase has substantially increased in 3.7.5. Like in 3.6.4 it progressively increases on each iteration of dropDatabase (which is the subject of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34713&quot; title=&quot;Progressively declining dropDatabase performance&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34713&quot;&gt;&lt;del&gt;SERVER-34713&lt;/del&gt;&lt;/a&gt;), although the coefficient may be smaller than 3.6.4. Variability appears to be quite a bit larger.&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/185163/185163_chart.png&quot; width=&quot;&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="535304">SERVER-34717</key>
            <summary>Performance regression in dropDatabase</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="13203">Gone away</resolution>
                                        <assignee username="daniel.gottlieb@mongodb.com">Daniel Gottlieb</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                            <label>nyc</label>
                    </labels>
                <created>Fri, 27 Apr 2018 17:29:03 +0000</created>
                <updated>Fri, 27 Oct 2023 20:43:28 +0000</updated>
                            <resolved>Mon, 6 Apr 2020 21:23:47 +0000</resolved>
                                    <version>3.7.5</version>
                                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>17</watches>
                                                                                                                <comments>
                            <comment id="3028337" author="daniel.gottlieb@10gen.com" created="Mon, 6 Apr 2020 21:23:47 +0000"  >&lt;p&gt;Closing as &quot;Gone away&quot;.&lt;/p&gt;</comment>
                            <comment id="3028058" author="bruce.lucas@10gen.com" created="Mon, 6 Apr 2020 19:31:37 +0000"  >&lt;p&gt;Re-ran on my machine and saw&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;~1s and steady for both 3.4.10 and 3.4.15&lt;/li&gt;
	&lt;li&gt;~5s and increasing for 3.6 and 4.0&lt;/li&gt;
	&lt;li&gt;~1.5s and steady for 4.2, 4.3.5, and master&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;So I agree it appears that the steadily worsening performance went away in 4.2. There is still possibly a performance difference between 4.2+ and 3.4 that could be investigated, but given the performance in 3.6 and 4.0 it seems a moot point now. So I&apos;m happy to close this as &quot;gone away&quot; if you are.&lt;/p&gt;</comment>
                            <comment id="3026498" author="daniel.gottlieb@10gen.com" created="Sun, 5 Apr 2020 03:28:58 +0000"  >&lt;p&gt;Disregard the &quot;histogram&quot; title; I don&apos;t know how to google sheets. This is over 1600 runs and I&apos;m not seeing any appreciable upward trend in latency. This is my ~24 hour run against master with EMRC: on&lt;/p&gt;

&lt;p&gt; &lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;a id=&quot;254968_thumb&quot; href=&quot;https://jira.mongodb.org/secure/attachment/254968/254968_Histogram.png&quot; title=&quot;Histogram.png&quot; file-preview-type=&quot;image&quot; file-preview-id=&quot;254968&quot; file-preview-title=&quot;Histogram.png&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/thumbnail/254968/_thumb_254968.png&quot; style=&quot;border: 0px solid black&quot; role=&quot;presentation&quot;/&gt;&lt;/a&gt;&lt;/span&gt; &lt;/p&gt;</comment>
                            <comment id="3026067" author="daniel.gottlieb@10gen.com" created="Fri, 3 Apr 2020 21:42:21 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=bruce.lucas&quot; class=&quot;user-hover&quot; rel=&quot;bruce.lucas&quot;&gt;bruce.lucas&lt;/a&gt; can you rerun your experiment against some recent master/4.4-ish build? I&apos;m getting a lot of variability and am unable to reproduce the order of magnitude you have. With 3.4.10 your graph shows ~500ms, while my 3.4.15 is at ~2s with some bumps to ~7-8 seconds. The good news on my run though is that master with EMRC=on (default, includes new two-phase drop) is ~400-500ms. EMRC=off (uses old two-phase drop) is ~3seconds.  If my numbers are trending upwards:&lt;br/&gt;
a) The variance may be masking it.&lt;br/&gt;
b) The improvement from new two-phase drop may negate the need for further improvements.&lt;/p&gt;

&lt;p&gt;In the meantime I&apos;ll gather data from a longer running experiment.&lt;/p&gt;</comment>
                            <comment id="1876587" author="benety.goh" created="Fri, 27 Apr 2018 19:46:07 +0000"  >&lt;p&gt;We may be able to rule &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34372&quot; title=&quot;Drop collection command with majority write concern should wait until two-phase drop finishes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34372&quot;&gt;&lt;del&gt;SERVER-34372&lt;/del&gt;&lt;/a&gt; out as a root cause because we introduced it in 3.7.6.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="535120">SERVER-34713</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="523439">SERVER-34372</issuekey>
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                            <attachment id="254968" name="Histogram.png" size="18012" author="daniel.gottlieb@mongodb.com" created="Sun, 5 Apr 2020 03:29:13 +0000"/>
                            <attachment id="185163" name="chart.png" size="13295" author="bruce.lucas@mongodb.com" created="Fri, 27 Apr 2018 17:30:10 +0000"/>
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