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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-63263] Add metric for connection establishment once MongoDB accepts() a new connection on a socket</title>
                <link>https://jira.mongodb.org/browse/SERVER-63263</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We have often seen large delays in client perceived connection establishment latency, and don&apos;t have enough data to pin-down exactly where the delay is. While we often suspect delays may be happening in the TCP stack below mongoDB, or perhaps the network, we don&apos;t know how long MongoDB itself is taking on average to accept a new connection.&#160;&lt;/p&gt;

&lt;p&gt;As a first step should add a histogram that reveals how much time it takes for connections to be accept()ed on a socket by MongoDB&apos;s listener thread, until the connection is given its own dedicated thread and begins to run operations.&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1976887">SERVER-63263</key>
            <summary>Add metric for connection establishment once MongoDB accepts() a new connection on a socket</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="reo.kimura@mongodb.com">Reo Kimura</assignee>
                                    <reporter username="george.wangensteen@mongodb.com">George Wangensteen</reporter>
                        <labels>
                    </labels>
                <created>Thu, 3 Feb 2022 18:30:06 +0000</created>
                <updated>Sun, 29 Oct 2023 21:43:08 +0000</updated>
                            <resolved>Wed, 20 Apr 2022 15:05:37 +0000</resolved>
                                                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="4492160" author="xgen-internal-githook" created="Tue, 19 Apr 2022 19:20:00 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Reo Kimura&apos;, &apos;email&apos;: &apos;reo.kimura@mongodb.com&apos;, &apos;username&apos;: &apos;rkimura21&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63263&quot; title=&quot;Add metric for connection establishment once MongoDB accepts() a new connection on a socket&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63263&quot;&gt;&lt;del&gt;SERVER-63263&lt;/del&gt;&lt;/a&gt; Add metric for connection establishment once MongoDB accepts() a new connection on a socket&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ee1a5f6c6cffda99cfdc1abc9ec29c5daa2cfaa2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ee1a5f6c6cffda99cfdc1abc9ec29c5daa2cfaa2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4401804" author="JIRAUSER1253443" created="Wed, 9 Mar 2022 19:24:02 +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;&#160;Yes, that is correct. I&apos;ll update this ticket with the relevant information as the code review progresses.&lt;/p&gt;</comment>
                            <comment id="4401779" author="bruce.lucas@10gen.com" created="Wed, 9 Mar 2022 19:16:38 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=george.wangensteen&quot; class=&quot;user-hover&quot; rel=&quot;george.wangensteen&quot;&gt;george.wangensteen&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=reo.kimura&quot; class=&quot;user-hover&quot; rel=&quot;reo.kimura&quot;&gt;reo.kimura&lt;/a&gt;, can you please add a comment to this ticket summarizing the design that you are going with? From the code review I think you are adding only a single metric, cumulativeConnectionEstablishmentLatency, and not a histogram, is that correct?&lt;/p&gt;</comment>
                            <comment id="4334049" author="bruce.lucas@10gen.com" created="Thu, 3 Feb 2022 18:38:52 +0000"  >&lt;p&gt;I assume the intent is to record this in FTDC. If so, ideally the histogram would have a small number of buckets so it doesn&apos;t add a large FTDC burden.&lt;/p&gt;

&lt;p&gt;Alternatively, you could add a single metric that records cumulative time for all connections between the two points you mention. This could then be used to compute the average time that it takes over any interval you want (delta time divided by delta connections), and we&apos;ve generally found that histograms don&apos;t add a lot of diagnostic value above what you get with averages.&lt;/p&gt;</comment>
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