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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>[SERVER-44676] TCP Fast Open</title>
                <link>https://jira.mongodb.org/browse/SERVER-44676</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We should investigate what work needs to be done to perform TCP Fast Open when speaking to other hosts.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1005051">SERVER-44676</key>
            <summary>TCP Fast Open</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="matthew.russotto@mongodb.com">Matthew Russotto</assignee>
                                    <reporter username="spencer.jackson@mongodb.com">Spencer Jackson</reporter>
                        <labels>
                    </labels>
                <created>Fri, 15 Nov 2019 21:19:48 +0000</created>
                <updated>Sun, 29 Oct 2023 22:14:51 +0000</updated>
                            <resolved>Mon, 23 Dec 2019 19:16:11 +0000</resolved>
                                                    <fixVersion>4.3.3</fixVersion>
                                    <component>Internal Client</component>
                    <component>Networking</component>
                    <component>Security</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2660047" author="xgen-internal-githook" created="Sun, 22 Dec 2019 01:56:43 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Sara Golemon&apos;, &apos;email&apos;: &apos;sara.golemon@mongodb.com&apos;, &apos;username&apos;: &apos;sgolemon&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44676&quot; title=&quot;TCP Fast Open&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44676&quot;&gt;&lt;del&gt;SERVER-44676&lt;/del&gt;&lt;/a&gt; Enable TCP_FASTOPEN&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8189e058304baa734ea892b69c37d16021e17a2f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8189e058304baa734ea892b69c37d16021e17a2f&lt;/a&gt;&lt;/p&gt;</comment>
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                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="1065211">DRIVERS-802</issuekey>
        </issuelink>
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                            <issuelinktype id="10320">
                    <name>Documented</name>
                                                                <inwardlinks description="is documented by">
                                        <issuelink>
            <issuekey id="1065210">DOCS-13316</issuekey>
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                            <issuelinktype id="10010">
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                                        <issuelink>
            <issuekey id="870278">SERVER-42324</issuekey>
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                            <customfieldvalue>This change enables &amp;quot;TCP Fast Open&amp;quot; (TFO) connections to MongoDB.&lt;br/&gt;
&lt;br/&gt;
* The operating system of both the client and server must have TFO support&lt;br/&gt;
** Windows: Server only on Windows 10 or later&lt;br/&gt;
** macOS: Server only on 10.11 or later&lt;br/&gt;
** Linux&lt;br/&gt;
*** Client: Kernel version &amp;gt;= 4.11, /proc/sys/net/ipv4/tcp_fastopen set to 1 or 3.&lt;br/&gt;
*** Server: Kernel version &amp;gt;= 3.7, /proc/sys/net/ipv4/tcp_fastopen set to 2 or 3&lt;br/&gt;
&lt;br/&gt;
setParameters (these are enabled by default):&lt;br/&gt;
* tcpFastOpenClient - Attempt to make outbound TFO connections&lt;br/&gt;
* tcpFastOpenServer - Accept inbound TFO connection attempts&lt;br/&gt;
&lt;br/&gt;
Additionally the following setParameter may be tuned on the server:&lt;br/&gt;
* tcpFastOpenQueueSize (default 1024). </customfieldvalue>

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