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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-26264] Make 3.2 mongos fail gracefully on startup when cluster is featureCompatibilityVersion(&quot;3.4&quot;)</title>
                <link>https://jira.mongodb.org/browse/SERVER-26264</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25158&quot; title=&quot;Prevent a 3.2 mongos from joining a featureCompatibilityVersion(&amp;quot;3.4&amp;quot;) cluster&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25158&quot;&gt;&lt;del&gt;SERVER-25158&lt;/del&gt;&lt;/a&gt;, we bumped the &lt;tt&gt;configsvr&lt;/tt&gt; mode number in &lt;tt&gt;isMaster&lt;/tt&gt; when the config server has featureCompatibiliityVersion &quot;3.4&quot;. This prevents a 3.2 mongos from starting up against a FCV(&quot;3.4&quot;) cluster. Existing versions of mongos will get stuck in an infinite loop during sharding initialization as they attempt to connect to the config server replica set:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.2.9/src/mongo/s/sharding_initialization.cpp#L185-L213&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r3.2.9/src/mongo/s/sharding_initialization.cpp#L185-L213&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;While looping, the mongos will repeatedly log messages such as the following:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2016-09-22T11:50:42.012-0400 W NETWORK  [mongosMain] No primary detected for set test-configRS&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2016-09-22T11:50:42.012-0400 I NETWORK  [mongosMain] All nodes for set test-configRS are down. This has happened for 5 checks in a row. Polling will stop after 25 more failed checks&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;...&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2016-09-22T11:50:42.513-0400 D -        [mongosMain] User Assertion: 28785:Unrecognized configsvr version number: 2. Expected either 0 or 1&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2016-09-22T11:50:42.514-0400 D -        [replSetDistLockPinger] User Assertion: 28785:Unrecognized configsvr version number: 2. Expected either 0 or 1&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Instead, the mongos process should quickly exit with a non-zero exit code and a useful error message, without ever making its routing service available. The error message should display a &quot;MustUpgrade&quot; error code and should link to the documentation for the 3.2=&amp;gt;3.4 upgrade process.&lt;/p&gt;</description>
                <environment></environment>
        <key id="318289">SERVER-26264</key>
            <summary>Make 3.2 mongos fail gracefully on startup when cluster is featureCompatibilityVersion(&quot;3.4&quot;)</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="9">Done</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                            <label>code-only</label>
                    </labels>
                <created>Thu, 22 Sep 2016 23:00:51 +0000</created>
                <updated>Thu, 15 Jun 2017 15:31:49 +0000</updated>
                            <resolved>Fri, 23 Sep 2016 21:00:42 +0000</resolved>
                                                    <fixVersion>3.2.10</fixVersion>
                                    <component>Querying</component>
                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1392406" author="xgen-internal-githook" created="Fri, 23 Sep 2016 20:59:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26264&quot; title=&quot;Make 3.2 mongos fail gracefully on startup when cluster is featureCompatibilityVersion(&amp;quot;3.4&amp;quot;)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26264&quot;&gt;&lt;del&gt;SERVER-26264&lt;/del&gt;&lt;/a&gt; fail gracefully when attempting to join a cluster with featureCompatibilityVersion 3.4&lt;br/&gt;
Branch: v3.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7026ff8dbc62b9649e8be1793d3273d9cc162174&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7026ff8dbc62b9649e8be1793d3273d9cc162174&lt;/a&gt;&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="318290">SERVER-26265</issuekey>
        </issuelink>
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                            <issuelinktype id="10320">
                    <name>Documented</name>
                                                                <inwardlinks description="is documented by">
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            <issuekey id="319534">DOCS-8895</issuekey>
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                            <issuelinktype id="10012">
                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="302409">SERVER-25158</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="389593">SERVER-29428</issuekey>
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