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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-33371] Don&apos;t allocate resources for ingress connection until first byte is received</title>
                <link>https://jira.mongodb.org/browse/SERVER-33371</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This is to reduce the cost of drivers that implement the Happy Eyeballs RFC to enable ipv6. That RFC calls for connecting over both ipv4 and ipv6 in parallel, using whichever connects first, and immediately closing the other connection.&lt;/p&gt;

&lt;p&gt;Currently the server allocates a thread and allocates many objects as soon as it accepts an ingress connection. We should defer that work until there is data ready to be read from the socket. This will avoid allocating resources (other than the FD) for the doomed connections that the drivers will be closing.&lt;/p&gt;

&lt;p&gt;This plan assumes that drivers won&apos;t send &lt;b&gt;any&lt;/b&gt; data over the doomed TCP socket, even to initiate a TLS handshake.&lt;/p&gt;</description>
                <environment></environment>
        <key id="499193">SERVER-33371</key>
            <summary>Don&apos;t allocate resources for ingress connection until first byte is received</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-server-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="mathias@mongodb.com">Mathias Stearn</reporter>
                        <labels>
                    </labels>
                <created>Fri, 16 Feb 2018 19:16:34 +0000</created>
                <updated>Tue, 6 Dec 2022 03:38:01 +0000</updated>
                            <resolved>Tue, 21 Dec 2021 18:39:10 +0000</resolved>
                                                                    <component>Networking</component>
                                        <votes>1</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1839444" author="kevin.albertson" created="Tue, 20 Mar 2018 13:36:45 +0000"  >&lt;p&gt;The C driver now implements the Happy Eyeballs RFC (&lt;a href=&quot;https://jira.mongodb.org/browse/CDRIVER-1972&quot; title=&quot;Support IPv6 only hostnames&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CDRIVER-1972&quot;&gt;&lt;del&gt;CDRIVER-1972&lt;/del&gt;&lt;/a&gt;) on master and is planned to be released for 1.10.&lt;/p&gt;</comment>
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