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    <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>[DOCS-14251] Investigate changes in SERVER-54278: Add feature flag to disable Opportunistic Reads by default</title>
                <link>https://jira.mongodb.org/browse/DOCS-14251</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;

    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    This ticket disables opportunistic read targeting by default, and introduces a new server parameter, &quot;opportunisticSecondaryTargeting&quot;, to enable this feature.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    Opportunistic reads against replica-sets was originally introduced in v4.2 as part of PM-856. This feature allows &lt;tt&gt;mongos&lt;/tt&gt; to&#160;direct secondary reads to any secondary with an active connection, instead of waiting for a new connection to a specific secondary.&lt;/p&gt;

&lt;p&gt;Under certain workloads, as described in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53853&quot; title=&quot;Large buildup of mongos to mongod connections and low performance with secondaryPreferred reads&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53853&quot;&gt;&lt;del&gt;SERVER-53853&lt;/del&gt;&lt;/a&gt;, opportunistic reads may trigger construction of unnecessary connections to &lt;tt&gt;mongod&lt;/tt&gt; processes, which would regress the overall performance.&lt;/p&gt;

&lt;p&gt;This ticket should introduce a new feature flag to disable opportunistic reads in v4.2 by default. In particular, the following tickets from PM-856 introduce new functionality that we might want to guard with the feature flag: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41132&quot; title=&quot;Support parallel targeting of hosts in the ARS&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41132&quot;&gt;&lt;del&gt;SERVER-41132&lt;/del&gt;&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41133&quot; title=&quot;Add TaskExecutor::scheduleRemoteCommandOnAny&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41133&quot;&gt;&lt;del&gt;SERVER-41133&lt;/del&gt;&lt;/a&gt;, and&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41134&quot; title=&quot;Add RSM::findHostsWithMaxWait&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41134&quot;&gt;&lt;del&gt;SERVER-41134&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;We may wan to approach this ticket from &lt;a href=&quot;https://github.com/mongodb/mongo/blob/156bf0ff52ac8efbc7b417ec9ddbc6facc48e0f4/src/mongo/executor/network_interface_tl.cpp#L371-L402&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this for loop&lt;/a&gt;, introduced by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41133&quot; title=&quot;Add TaskExecutor::scheduleRemoteCommandOnAny&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41133&quot;&gt;&lt;del&gt;SERVER-41133&lt;/del&gt;&lt;/a&gt; (see excerpt below).&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;
		&lt;tbody &gt;
				&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-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// Attempt to get a connection to every target host&lt;/span&gt;&lt;/pre&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;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;for&lt;/span&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; (&lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;size_t&lt;/span&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; idx = 0; idx &amp;lt; request.target.size() &amp;amp;&amp;amp; !cmdState-&amp;gt;finishLine.isReady(); ++idx) {&lt;/span&gt;&lt;/pre&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;   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;    auto connFuture = _pool-&amp;gt;get(request.target[idx], request.sslMode, request.timeout);&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;   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;    ...&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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&lt;p/&gt;


&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="1632901">DOCS-14251</key>
            <summary>Investigate changes in SERVER-54278: Add feature flag to disable Opportunistic Reads by default</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="andrew.feierabend@mongodb.com">Andrew Feierabend</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Wed, 24 Feb 2021 21:48:12 +0000</created>
                <updated>Mon, 13 Nov 2023 17:57:38 +0000</updated>
                            <resolved>Fri, 26 Feb 2021 20:52:48 +0000</resolved>
                                                    <fixVersion>4.2.13</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due>Fri, 26 Feb 2021 00:00:00 +0000</due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3674151" author="xgen-internal-githook" created="Fri, 19 Mar 2021 18:30:56 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Andrew Feierabend&apos;, &apos;email&apos;: &apos;andrew.feierabend@mongodb.com&apos;, &apos;username&apos;: &apos;andf-mongodb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-14251&quot; title=&quot;Investigate changes in SERVER-54278: Add feature flag to disable Opportunistic Reads by default&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-14251&quot;&gt;&lt;del&gt;DOCS-14251&lt;/del&gt;&lt;/a&gt; add opportunisticSecondaryTargeting v4.2 only&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/ef68c4ecf7162a48fff581eda96c026383c76b0d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/ef68c4ecf7162a48fff581eda96c026383c76b0d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3637882" author="xgen-internal-githook" created="Fri, 26 Feb 2021 20:52:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Andrew Feierabend&apos;, &apos;email&apos;: &apos;andrew.feierabend@mongodb.com&apos;, &apos;username&apos;: &apos;andf-mongodb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-14251&quot; title=&quot;Investigate changes in SERVER-54278: Add feature flag to disable Opportunistic Reads by default&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-14251&quot;&gt;&lt;del&gt;DOCS-14251&lt;/del&gt;&lt;/a&gt; add opportunisticSecondaryTargeting v4.2 only&lt;br/&gt;
Branch: v4.2.13&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/5f1b833ec95a22f18696d72383bfcc50693e07ab&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/5f1b833ec95a22f18696d72383bfcc50693e07ab&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3636018" author="andrew.feierabend" created="Thu, 25 Feb 2021 21:21:51 +0000"  >&lt;p&gt;Thank you!!&lt;/p&gt;</comment>
                    </comments>
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