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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-12085] Docs for SERVER-35656: Ensure a 4.0 mongos crashes upon attempting to connect to an FCV 4.2 cluster</title>
                <link>https://jira.mongodb.org/browse/DOCS-12085</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;blockquote&gt;
&lt;h3&gt;&lt;a name=&quot;Description%3A&quot;&gt;&lt;/a&gt;Description: &lt;/h3&gt;

&lt;p&gt;Document the changed behavior in adding a 4.0 mongos to a 4.2 cluster&lt;/p&gt;

&lt;h3&gt;&lt;a name=&quot;EngineeringTicketDescription%3A&quot;&gt;&lt;/a&gt;Engineering Ticket Description:&lt;/h3&gt;

&lt;p&gt;As part of&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32635&quot; title=&quot;Provide a framework to ensure a last stable binary version mongos crashes when attempting to connect to a latest featureCompatibilityVersion sharded cluster for all last stable binary versions &amp;gt;= 3.8&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32635&quot;&gt;&lt;del&gt;SERVER-32635&lt;/del&gt;&lt;/a&gt;, a last-stable binary version mongos will crash upon attempting to connect to a latest featureCompatibilityVersion cluster. However, since this behavior was added for 4.0 mongos and FCV 4.2 was not present at the time, some special testing behavior was necessary to simulate a 4.0 mongos crashing. As part of the 4.2 upgrade/downgrade work, the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d1c188b17167f0430f5a8d10e972c0d00a908ba2/jstests/sharding/crash_mongos_against_upgraded_cluster.js&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;crash_mongos_against_upgraded_cluster.js&lt;/a&gt; test should be updated to no longer rely on these failpoints and just directly use a 4.0 mongos and FCV 4.2 cluster. The failpoints/wireVersion added as part of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32635&quot; title=&quot;Provide a framework to ensure a last stable binary version mongos crashes when attempting to connect to a latest featureCompatibilityVersion sharded cluster for all last stable binary versions &amp;gt;= 3.8&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32635&quot;&gt;&lt;del&gt;SERVER-32635&lt;/del&gt;&lt;/a&gt; solely for simulation of the crash should also be removed.&lt;/p&gt;&lt;/blockquote&gt;

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

&lt;ul&gt;
	&lt;li&gt;Add note to:
	&lt;ul&gt;
		&lt;li&gt;mongos ref and conceptual pages&lt;/li&gt;
		&lt;li&gt;sharded cluster update page&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;the 4.0 version already mentions the fcv/mongos in 4.0 compatibility:
	&lt;ul&gt;
		&lt;li&gt;for now, won&apos;t add to 4.0 mongos ref and conceptual pages&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&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="610848">DOCS-12085</key>
            <summary>Docs for SERVER-35656: Ensure a 4.0 mongos crashes upon attempting to connect to an FCV 4.2 cluster</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="kay.kim@mongodb.com">Kay Kim</reporter>
                        <labels>
                    </labels>
                <created>Thu, 27 Sep 2018 15:41:15 +0000</created>
                <updated>Mon, 13 Nov 2023 18:30:59 +0000</updated>
                            <resolved>Thu, 8 Nov 2018 21:23:15 +0000</resolved>
                                                    <fixVersion>4.1.1</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>1</watches>
                                                                                                                <comments>
                            <comment id="2056576" author="xgen-internal-githook" created="Thu, 8 Nov 2018 21:21:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;kay&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12085&quot; title=&quot;Docs for SERVER-35656: Ensure a 4.0 mongos crashes upon attempting to connect to an FCV 4.2 cluster&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12085&quot;&gt;&lt;del&gt;DOCS-12085&lt;/del&gt;&lt;/a&gt;: mongos and fcv&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/599d70af865b14dfa631a5dfc649fdbb81a1e2b0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/599d70af865b14dfa631a5dfc649fdbb81a1e2b0&lt;/a&gt;&lt;/p&gt;</comment>
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