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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[JAVA-1567] Calculate round trip time using exponentially weighted average</title>
                <link>https://jira.mongodb.org/browse/JAVA-1567</link>
                <project id="10006" key="JAVA">Java Driver</project>
                    <description>&lt;p&gt;If there have been no RTT measurements for a server (e.g. the first ismaster command after the server becomes available), the average RTT MUST be set equal to the first RTT measurement.&lt;/p&gt;

&lt;p&gt;After the first measurement, average RTT MUST be computed using an exponentially-weighted moving average formula, with a weighting factor (alpha) of 0.2. If the prior average is denoted old_rtt, then the new average (new_rtt) is computed from a new RTT measurement &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/error.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt; using the following formula:&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;
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					&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;alpha = 0.2&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&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;new_rtt = alpha * x + (1 - alpha) * old_rtt&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;A weighting factor of 0.2 was chosen to put about 85% of the weight of the average RTT on the 9 most recent observations.&lt;/p&gt;</description>
                <environment></environment>
        <key id="170237">JAVA-1567</key>
            <summary>Calculate round trip time using exponentially weighted average</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="jeff.yemin@mongodb.com">Jeffrey Yemin</assignee>
                                    <reporter username="jeff.yemin@mongodb.com">Jeffrey Yemin</reporter>
                        <labels>
                    </labels>
                <created>Wed, 19 Nov 2014 18:44:07 +0000</created>
                <updated>Tue, 31 Mar 2015 20:09:52 +0000</updated>
                            <resolved>Fri, 21 Nov 2014 18:44:03 +0000</resolved>
                                                    <fixVersion>3.0.0</fixVersion>
                                    <component>Cluster Management</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="869450" author="jeff.yemin" created="Tue, 31 Mar 2015 20:09:52 +0000"  >&lt;p&gt;Closing all resolved 3.0.0 issues, as 3.0.0 has been tagged and released.&lt;/p&gt;</comment>
                            <comment id="818023" author="xgen-internal-githook" created="Fri, 30 Jan 2015 18:45:38 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;jyemin&apos;, u&apos;name&apos;: u&apos;Jeff Yemin&apos;, u&apos;email&apos;: u&apos;jeff.yemin@10gen.com&apos;}
&lt;p&gt;Message: Calculate round trip time as an exponentially weighted moving average, using a value of 0.2 for the weighting factor.&lt;br/&gt;
A weighting factor of 0.2 was chosen to put about 85% of the weight of the average RTT on the 9 most recent observations.&lt;/p&gt;

&lt;p&gt; &lt;a href=&quot;https://jira.mongodb.org/browse/JAVA-1567&quot; title=&quot;Calculate round trip time using exponentially weighted average&quot; class=&quot;issue-link&quot; data-issue-key=&quot;JAVA-1567&quot;&gt;&lt;del&gt;JAVA-1567&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-java-driver/commit/81eaf6ed077e6171553430a12a64abc710cdda21&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-java-driver/commit/81eaf6ed077e6171553430a12a64abc710cdda21&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="770191" author="xgen-internal-githook" created="Fri, 21 Nov 2014 18:43:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;jyemin&apos;, u&apos;name&apos;: u&apos;Jeff Yemin&apos;, u&apos;email&apos;: u&apos;jeff.yemin@10gen.com&apos;}
&lt;p&gt;Message: Calculate round trip time as an exponentially weighted moving average, using a value of 0.2 for the weighting factor.&lt;br/&gt;
A weighting factor of 0.2 was chosen to put about 85% of the weight of the average RTT on the 9 most recent observations.&lt;/p&gt;

&lt;p&gt; &lt;a href=&quot;https://jira.mongodb.org/browse/JAVA-1567&quot; title=&quot;Calculate round trip time using exponentially weighted average&quot; class=&quot;issue-link&quot; data-issue-key=&quot;JAVA-1567&quot;&gt;&lt;del&gt;JAVA-1567&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: 3.0.x&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-java-driver/commit/81eaf6ed077e6171553430a12a64abc710cdda21&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-java-driver/commit/81eaf6ed077e6171553430a12a64abc710cdda21&lt;/a&gt;&lt;/p&gt;</comment>
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