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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-29304] Exclude time spent blocking for awaitData from latency metrics</title>
                <link>https://jira.mongodb.org/browse/SERVER-29304</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When a getMore is issued against a tailable cursor with the awaitData option and no results are currently available, the thread executing the getMore will wait on a condition variable for additional results to become available via insertion into the capped collection. This allows clients to periodically poll a capped collection for new records.&lt;/p&gt;

&lt;p&gt;This waiting time is currently incorporated into some of the latency measurements surfaced by the server (e.g. in diagnostic logs, the system.profile collection, and the &lt;tt&gt;opLatencies&lt;/tt&gt; section of serverStatus). This can be counter-intuitive to users, since reporting on average latency may be skewed by this &quot;expected&quot; waiting time on systems that are mostly idle. Therefore, we should exclude this &quot;expected latency&quot; from the following:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;system.profile&lt;/li&gt;
	&lt;li&gt;slow query logs&lt;/li&gt;
	&lt;li&gt;top&lt;/li&gt;
	&lt;li&gt;global operation latency histogram&lt;/li&gt;
	&lt;li&gt;per-collection operation latency histogram&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Note, however, that this behavior change will not apply to &lt;tt&gt;db.currentOp()&lt;/tt&gt;&apos;s &lt;tt&gt;secs_running&lt;/tt&gt; or &lt;tt&gt;microsecs_running&lt;/tt&gt;, since this output is more often used to gauge the true latency of active operations, rather than generating reports after the fact.&lt;/p&gt;</description>
                <environment></environment>
        <key id="385226">SERVER-29304</key>
            <summary>Exclude time spent blocking for awaitData from latency metrics</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="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Fri, 19 May 2017 20:06:43 +0000</created>
                <updated>Mon, 30 Oct 2023 23:16:38 +0000</updated>
                            <resolved>Wed, 14 Jun 2017 22:56:18 +0000</resolved>
                                                    <fixVersion>3.5.9</fixVersion>
                                    <component>Diagnostics</component>
                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>14</watches>
                                                                                                                <comments>
                            <comment id="1597414" author="xgen-internal-githook" created="Wed, 14 Jun 2017 22:53:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29304&quot; title=&quot;Exclude time spent blocking for awaitData from latency metrics&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29304&quot;&gt;&lt;del&gt;SERVER-29304&lt;/del&gt;&lt;/a&gt; Exclude time spent blocking for awaitData from getMore latency reporting.&lt;/p&gt;

&lt;p&gt;This change applies to various server diagnostics which&lt;br/&gt;
include latency metrics: the slow query logs, the&lt;br/&gt;
system.profile collection, top, global operation latency&lt;br/&gt;
stats, and per-collection operation latency stats. The&lt;br/&gt;
secs_running and microsecs_running fields reported in&lt;br/&gt;
currentOp output, on the other hand, will include time spent&lt;br/&gt;
blocking for awaitData.&lt;/p&gt;

&lt;p&gt;Furthermore, this change fixes the following:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;getMore operations are no longer double-counted.&lt;/li&gt;
	&lt;li&gt;Lock acquisition times are now consistently included.&lt;br/&gt;
   This fixes a bug in which time spent acquiring locks was&lt;br/&gt;
   accidentally omitted in some cases.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a68f209e4ff495e805e4d1b12d6fc3381c56a771&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a68f209e4ff495e805e4d1b12d6fc3381c56a771&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
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            <issuekey id="206138">SERVER-18637</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="383223">SERVER-29189</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="389796">SERVER-29435</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="544199">SERVER-34998</issuekey>
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