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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[DOCS-615] Documentation on localThreshold internals</title>
                <link>https://jira.mongodb.org/browse/DOCS-615</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;Given the level of documentation on &lt;tt&gt;--localThreshold&lt;/tt&gt; it would be a common expectation that setting this option will cause an immediate switch of queries falling below the threshold.  However, as the value is calculated on a moving average, and only done once every 10 seconds, it can take some time for the steady state ping to emerge.  This means some queries will hit secondaries below the threshold until the steady state is reached.&lt;/p&gt;

&lt;p&gt;Some documentation on how we reach the threshold calculated value would clear up any confusion.&lt;/p&gt;</description>
                <environment></environment>
        <key id="53244">DOCS-615</key>
            <summary>Documentation on localThreshold internals</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="9">Done</resolution>
                                        <assignee username="sam.kleinman">Sam Kleinman</assignee>
                                    <reporter username="andre.defrere@mongodb.com">Andre de Frere</reporter>
                        <labels>
                    </labels>
                <created>Tue, 16 Oct 2012 00:42:50 +0000</created>
                <updated>Thu, 29 Nov 2012 16:35:00 +0000</updated>
                            <resolved>Tue, 30 Oct 2012 18:59:45 +0000</resolved>
                                                                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="180649" author="auto" created="Tue, 30 Oct 2012 18:59:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-10-30T11:55:53-07:00&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-615&quot; title=&quot;Documentation on localThreshold internals&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-615&quot;&gt;&lt;del&gt;DOCS-615&lt;/del&gt;&lt;/a&gt;: clarifying local threshold&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/59b90df120f5038eb51840215d7e411766f30711&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/59b90df120f5038eb51840215d7e411766f30711&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="175433" author="samk" created="Tue, 16 Oct 2012 14:53:26 +0000"  >&lt;p&gt;Changing the setting requires a restart of the &lt;tt&gt;mongos&lt;/tt&gt;, which should reset the cached average, and provide a more expected behavior. &lt;/p&gt;

&lt;p&gt;I can add a note to the documentation that says the &lt;tt&gt;mongos&lt;/tt&gt; calculates latency using a rolling average of response times, and as a result it may take a little while for actual changes in ping times to affect observed behavior. &lt;/p&gt;

&lt;p&gt;Having said that, this seems like the kind of thing that might be worth thinking about as a behavior change to the C++ driver (and therefore the &lt;tt&gt;mongos&lt;/tt&gt;) if it&apos;s the kind of thing that is unintuitive and actually causing problems.&lt;/p&gt;</comment>
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