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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>[DOCS-13369] Investigate changes in SERVER-45440: Add support for implicit operation hedging when using readPreference mode nearest</title>
                <link>https://jira.mongodb.org/browse/DOCS-13369</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;After &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45432&quot; title=&quot;Basic Support for operation hedging in NetworkInterfaceTL&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45432&quot;&gt;&lt;del&gt;SERVER-45432&lt;/del&gt;&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45434&quot; title=&quot;Modify RemoteCommandRequestOnAny to support hedge options&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45434&quot;&gt;&lt;del&gt;SERVER-45434&lt;/del&gt;&lt;/a&gt; are completed, mongos will perform hedged reads by default when the readPreference mode is &#8220;nearest&#8221;.&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;Add support for implicit delay selection and opt in to hedge options when using readPreference nearest.&lt;/p&gt;

&lt;p&gt;For all queries with readPreference mode &quot;nearest&quot;, pass hedge options of:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;count = 1&lt;/li&gt;
	&lt;li&gt;delay = as computed by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45449&quot; title=&quot;Write a function to compute the desired latency for a staggered hedged read&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45449&quot;&gt;&lt;del&gt;SERVER-45449&lt;/del&gt;&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;
&lt;div class=&apos;table-wrap&apos;&gt;
&lt;table class=&apos;confluenceTable&apos;&gt;&lt;tbody&gt;
&lt;tr&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;Update Doc&lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;DOCS ticket&lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;SERVER/DRIVER ticket&lt;/th&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Server Selection&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13369&quot; title=&quot;Investigate changes in SERVER-45440: Add support for implicit operation hedging when using readPreference mode nearest&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13369&quot;&gt;&lt;del&gt;DOCS-13369&lt;/del&gt;&lt;/a&gt;&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45440&quot; title=&quot;Add support for implicit operation hedging when using readPreference mode nearest&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45440&quot;&gt;&lt;del&gt;SERVER-45440&lt;/del&gt;&lt;/a&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Read pref nearest&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13369&quot; title=&quot;Investigate changes in SERVER-45440: Add support for implicit operation hedging when using readPreference mode nearest&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13369&quot;&gt;&lt;del&gt;DOCS-13369&lt;/del&gt;&lt;/a&gt;&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45440&quot; title=&quot;Add support for implicit operation hedging when using readPreference mode nearest&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45440&quot;&gt;&lt;del&gt;SERVER-45440&lt;/del&gt;&lt;/a&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;readHedgingMode (on/off) parameter&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13375&quot; title=&quot;Investigate changes in SERVER-45437: Add readHedgingMode serverParameter&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13375&quot;&gt;&lt;del&gt;DOCS-13375&lt;/del&gt;&lt;/a&gt;&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45437&quot; title=&quot;Add readHedgingMode serverParameter&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45437&quot;&gt;&lt;del&gt;SERVER-45437&lt;/del&gt;&lt;/a&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;maxTimeMSForHedgedReads&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13429&quot; title=&quot;Investigate changes in SERVER-46234: Remove the code for computing hedging delay and add maxTimeMSForHedgedReads serverParameter&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13429&quot;&gt;&lt;del&gt;DOCS-13429&lt;/del&gt;&lt;/a&gt;&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46234&quot; title=&quot;Remove the code for computing hedging delay and add maxTimeMSForHedgedReads serverParameter&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46234&quot;&gt;&lt;del&gt;SERVER-46234&lt;/del&gt;&lt;/a&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&lt;a href=&quot;https://docs.mongodb.com/manual/reference/method/Mongo.setReadPref&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Mongo.setReadPref&lt;/a&gt;&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13506&quot; title=&quot;Investigate changes in SERVER-46567: Update shell methods Mongo.setReadPref and cursor.readPref to support hedging&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13506&quot;&gt;&lt;del&gt;DOCS-13506&lt;/del&gt;&lt;/a&gt;&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46567&quot; title=&quot;Update shell methods Mongo.setReadPref and cursor.readPref to support hedging&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46567&quot;&gt;&lt;del&gt;SERVER-46567&lt;/del&gt;&lt;/a&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&lt;a href=&quot;https://docs.mongodb.com/manual/reference/method/cursor.readPref/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;cursor.readPref&lt;/a&gt;&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13506&quot; title=&quot;Investigate changes in SERVER-46567: Update shell methods Mongo.setReadPref and cursor.readPref to support hedging&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13506&quot;&gt;&lt;del&gt;DOCS-13506&lt;/del&gt;&lt;/a&gt;&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46567&quot; title=&quot;Update shell methods Mongo.setReadPref and cursor.readPref to support hedging&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46567&quot;&gt;&lt;del&gt;SERVER-46567&lt;/del&gt;&lt;/a&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Blurb about driver helper methods and not connection string &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13586&quot; title=&quot;remove uri connection string blurb for hedged reads&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13586&quot;&gt;&lt;del&gt;DOCS-13586&lt;/del&gt;&lt;/a&gt; &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/DRIVERS-723&quot; title=&quot;Driver support for server Hedged Reads&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DRIVERS-723&quot;&gt;&lt;del&gt;DRIVERS-723&lt;/del&gt;&lt;/a&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
&lt;/div&gt;


&lt;p&gt;=&lt;/p&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="1114900">DOCS-13369</key>
            <summary>Investigate changes in SERVER-45440: Add support for implicit operation hedging when using readPreference mode nearest</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="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Sat, 25 Jan 2020 03:32:13 +0000</created>
                <updated>Mon, 13 Nov 2023 18:11:23 +0000</updated>
                            <resolved>Thu, 5 Mar 2020 16:23:43 +0000</resolved>
                                                    <fixVersion>4.3.3</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></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2945259" author="xgen-internal-githook" created="Thu, 5 Mar 2020 16:22:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;username&apos;: &apos;kay-kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13369&quot; title=&quot;Investigate changes in SERVER-45440: Add support for implicit operation hedging when using readPreference mode nearest&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13369&quot;&gt;&lt;del&gt;DOCS-13369&lt;/del&gt;&lt;/a&gt;,&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13375&quot; title=&quot;Investigate changes in SERVER-45437: Add readHedgingMode serverParameter&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13375&quot;&gt;&lt;del&gt;DOCS-13375&lt;/del&gt;&lt;/a&gt;,&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13429&quot; title=&quot;Investigate changes in SERVER-46234: Remove the code for computing hedging delay and add maxTimeMSForHedgedReads serverParameter&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13429&quot;&gt;&lt;del&gt;DOCS-13429&lt;/del&gt;&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13487&quot; title=&quot;Investigate changes in SERVER-45438: Create serverStatus section for hedging metrics&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13487&quot;&gt;&lt;del&gt;DOCS-13487&lt;/del&gt;&lt;/a&gt; hedged reads for nearest, readHedgingMode param, maxTimeMSForHedgedReads, serverStatus hedging metrics&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/76c7fddf7e3a41454f4f90c3c9b6226f641333e3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/76c7fddf7e3a41454f4f90c3c9b6226f641333e3&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
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                                        <issuelink>
            <issuekey id="1082484">SERVER-45440</issuekey>
        </issuelink>
                            </outwardlinks>
                                                        </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="1119755">DOCS-13375</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1259631">DOCS-13506</issuekey>
        </issuelink>
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                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="900382">DRIVERS-723</issuekey>
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