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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[CDRIVER-1902] Round trip time not reset on disconnect</title>
                <link>https://jira.mongodb.org/browse/CDRIVER-1902</link>
                <project id="10030" key="CDRIVER">C Driver</project>
                    <description>&lt;p&gt;After a server description is invalidated (typically from a socket hangup during an application operation), its RTT should be reset. The next time we successfully connect to it, the new RTT begins a new series of moving averages.&lt;/p&gt;

&lt;p&gt;The Server Discovery And Monitoring Spec says about a server description, &quot;if it changes from a known type to Unknown its RTT is set to null.&quot;&lt;/p&gt;

&lt;p&gt;The C Driver instead records an RTT of 0 and factors this into the moving average. Therefore, a server that we have failed to reach for the last few checks and then successfully connected to, appears to have a very &lt;b&gt;low&lt;/b&gt; latency and it is preferred for reads.&lt;/p&gt;</description>
                <environment></environment>
        <key id="328978">CDRIVER-1902</key>
            <summary>Round trip time not reset on disconnect</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="9">Done</resolution>
                                        <assignee username="jesse@mongodb.com">A. Jesse Jiryu Davis</assignee>
                                    <reporter username="jesse@mongodb.com">A. Jesse Jiryu Davis</reporter>
                        <labels>
                    </labels>
                <created>Thu, 3 Nov 2016 02:56:22 +0000</created>
                <updated>Fri, 4 Nov 2016 02:59:51 +0000</updated>
                            <resolved>Fri, 4 Nov 2016 02:59:41 +0000</resolved>
                                    <version>1.2.0</version>
                                    <fixVersion>1.5.0</fixVersion>
                                    <component>libmongoc</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="1425862" author="xgen-internal-githook" created="Fri, 4 Nov 2016 02:59:51 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;ajdavis&apos;, u&apos;name&apos;: u&apos;A. Jesse Jiryu Davis&apos;, u&apos;email&apos;: u&apos;jesse@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CDRIVER-1902&quot; title=&quot;Round trip time not reset on disconnect&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CDRIVER-1902&quot;&gt;&lt;del&gt;CDRIVER-1902&lt;/del&gt;&lt;/a&gt; reset round trip time on error&lt;/p&gt;

&lt;p&gt;After a server description is invalidated (typically from a socket hangup&lt;br/&gt;
during an application operation), its RTT should be reset. The next time we&lt;br/&gt;
successfully connect to it, the new RTT begins a new series of moving averages.&lt;/p&gt;

&lt;p&gt;The Server Discovery And Monitoring Spec says about a server description, &quot;if&lt;br/&gt;
it changes from a known type to Unknown its RTT is set to null.&quot;&lt;/p&gt;

&lt;p&gt;The C Driver instead records an RTT of 0 and factors this into the moving&lt;br/&gt;
average. Therefore, a server that we have failed to reach for the last few&lt;br/&gt;
checks and then successfully connected to, appears to have a very low latency&lt;br/&gt;
and it is preferred for reads.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-c-driver/commit/53a43737e29c2870459ff5ee986caa12a384d368&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-c-driver/commit/53a43737e29c2870459ff5ee986caa12a384d368&lt;/a&gt;&lt;/p&gt;</comment>
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