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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>
    </build-info>


<item>
            <title>[SERVER-43131] diagnostic.data and mongod.log disagree on when a connection was established</title>
                <link>https://jira.mongodb.org/browse/SERVER-43131</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I created &lt;a href=&quot;https://github.com/mongodb-labs/benchmarks/blob/7c9f4af9d2077c35b2b1e333b1ceab2b6f501143/sysbench/lua/high_thread_count.lua&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;a benchmark&lt;/a&gt; that opens lots of connections. I ran this with:&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;
		&lt;tbody &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-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;./high_thread_count.lua run --time=720 --rate=3000 --threads=36 --idle-handlers=20 --idle-connections=400000 --csv-file=../../../sysbench.csv --percentile=99 --report-interval=1 --mongo-url=&apos;mongodb://username:password@10.2.0.200:27017/admin?replicaSet=rs0&amp;amp;w=3&apos;&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;p&gt;The above will open 36 connections that maintain a constant load of 2000 queries/sec and also open about 830 new idle connections per second. For keep-alive purposes the idle connections do a single query each after 300 seconds.&lt;/p&gt;

&lt;p&gt;In mongod.log I can see the connections opened at the start of the test:&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;
		&lt;tbody &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-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;2019-09-02T15:36:14.137+0000 I  NETWORK  [listener] connection accepted from 10.2.0.10:50966 #82 (72 connections now open)&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;   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;2019-09-02T15:36:14.137+0000 I  NETWORK  [conn82] received client metadata from 10.2.0.10:50966 conn82: { driver: { name: &quot;mongoc&quot;, version: &quot;1.14.0&quot; }, os: { type: &quot;Linux&quot;, name: &quot;Amazon Linux&quot;, version: &quot;2&quot;, architecture: &quot;x86_64&quot; }, platform: &quot;cfg=0x2156a0e9 posix=200809 stdc=201112 CC=GCC 7.3.1 20180303 (Red Hat 7.3.1-5) CFLAGS=&quot;&quot; LDFLAGS=&quot;&quot;&quot; }&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;2019-09-02T15:36:14.163+0000 I  ACCESS   [conn82] Successfully authenticated as principal username on admin from client 10.2.0.10:50966&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;p&gt;However, in the  diagnostic.data only 36 connections are created at that time, and a large increase in connections is only seen 300 s later.&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/229232/229232_screenshot-1.png&quot; width=&quot;600&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt; &lt;/p&gt;</description>
                <environment></environment>
        <key id="915150">SERVER-43131</key>
            <summary>diagnostic.data and mongod.log disagree on when a connection was established</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="4">Incomplete</resolution>
                                        <assignee username="backlog-server-platform">DO NOT USE - Backlog - Platform Team</assignee>
                                    <reporter username="henrik.ingo@mongodb.com">Henrik Ingo</reporter>
                        <labels>
                    </labels>
                <created>Tue, 3 Sep 2019 09:44:37 +0000</created>
                <updated>Tue, 3 Sep 2019 11:29:54 +0000</updated>
                            <resolved>Tue, 3 Sep 2019 11:29:54 +0000</resolved>
                                    <version>4.2.0</version>
                                                    <component>Diagnostics</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2405136" author="henrik.ingo@10gen.com" created="Tue, 3 Sep 2019 11:29:54 +0000"  >&lt;p&gt;Ah my mistake. Writing this ticket I now see they do in fact agree.&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="229233" name="mongod.0.tar.gz" size="1477755" author="henrik.ingo@mongodb.com" created="Tue, 3 Sep 2019 09:50:29 +0000"/>
                            <attachment id="229232" name="screenshot-1.png" size="265055" author="henrik.ingo@mongodb.com" created="Tue, 3 Sep 2019 09:48:51 +0000"/>
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                            <customfieldvalue>&lt;p&gt;git clone &lt;a href=&quot;https://github.com/mongodb-labs/benchmarks&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb-labs/benchmarks&lt;/a&gt;&lt;br/&gt;
cd benchmarks/sysbench/lua&lt;br/&gt;
./high_thread_count.lua run --time=720 --rate=3000 --threads=36 --idle-handlers=20 --idle-connections=400000 --csv-file=../../../sysbench.csv --percentile=99 --report-interval=1 --mongo-url=&apos;mongodb://username:password@10.2.0.200:27017/admin?replicaSet=rs0&amp;amp;w=3&apos;&lt;/p&gt;

&lt;p&gt;For reference, my data is from this patch build: &lt;a href=&quot;https://evergreen.mongodb.com/task/sys_perf_4.2_linux_3_node_replSet_sysbench_patch_a4b751dcf51dd249c5865812b390cfd1c0129c30_5d692e57e3c33122f4866e52_19_08_30_14_19_01#&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://evergreen.mongodb.com/task/sys_perf_4.2_linux_3_node_replSet_sysbench_patch_a4b751dcf51dd249c5865812b390cfd1c0129c30_5d692e57e3c33122f4866e52_19_08_30_14_19_01#&lt;/a&gt;&lt;/p&gt;</customfieldvalue>

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