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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>[DRIVERS-822] Asymmetric Routing for Remote Procedure Calls</title>
                <link>https://jira.mongodb.org/browse/DRIVERS-822</link>
                <project id="10980" key="DRIVERS">Drivers</project>
                    <description>
    &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;    Haven&apos;t scoped it yet but expect there to be Drivers changes.&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;
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&lt;h4&gt;&lt;a name=&quot;Summary&quot;&gt;&lt;/a&gt;Summary&lt;/h4&gt;
&lt;p&gt;Allow a client to receive a response for a request from a node different than the one it made the request to&lt;/p&gt;

&lt;h4&gt;&lt;a name=&quot;Motivation&quot;&gt;&lt;/a&gt;Motivation&lt;/h4&gt;
&lt;p&gt;Sometimes we route requests to nodes that can&apos;t service those requests.  Today all we can do would be to either fail those requests (and retarget + retry) or make another request from the initial node, routing the response back through that node to the client.  Both of those approaches require an extra network hop that isn&apos;t strictly speaking necessary.&lt;/p&gt;

&lt;p&gt;By routing a response directly from the initial node to the node which can service the request, a client could receive a misrouted request in 3 hops, rather than 4.&lt;/p&gt;

&lt;p&gt;(Proposed) Client -&amp;gt; ineligible node -&amp;gt; eligible node -&amp;gt; client&lt;br/&gt;
vs.&lt;br/&gt;
(fail + retarget) Client -&amp;gt; ineligible node -&amp;gt; Client -&amp;gt; eligible node -&amp;gt; Client&lt;br/&gt;
vs.&lt;br/&gt;
(route request) Client -&amp;gt; ineligible node -&amp;gt; eligible node -&amp;gt; ineligible node -&amp;gt; Client&lt;/p&gt;


&lt;h4&gt;&lt;a name=&quot;CastofCharacters&quot;&gt;&lt;/a&gt;Cast of Characters&lt;/h4&gt;
&lt;ul&gt;
	&lt;li&gt;Product Owner:&lt;/li&gt;
	&lt;li&gt;Project Lead:&lt;/li&gt;
	&lt;li&gt;Program Manager:&lt;/li&gt;
&lt;/ul&gt;



&lt;h4&gt;&lt;a name=&quot;Documentation&quot;&gt;&lt;/a&gt;Documentation&lt;/h4&gt;
&lt;p&gt;&lt;a href=&quot;http://tinyurl.com/vtsoq6u&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Scope Document&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;http://tinyurl.com/vd5mge9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Technical Design Document&lt;/a&gt;&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;
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                <environment></environment>
        <key id="1124372">DRIVERS-822</key>
            <summary>Asymmetric Routing for Remote Procedure Calls</summary>
                <type id="11" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14707&amp;avatarType=issuetype">Epic</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Fri, 31 Jan 2020 15:16:22 +0000</created>
                <updated>Mon, 26 Sep 2022 00:09:24 +0000</updated>
                            <resolved>Mon, 26 Sep 2022 00:09:24 +0000</resolved>
                                                                            <votes>0</votes>
                                    <watches>3</watches>
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