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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-37472] Improve behavior if user downgrades to 4.0 binary without setting FCV to 4.0</title>
                <link>https://jira.mongodb.org/browse/SERVER-37472</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, if a user tries to run a 4.0 mongod binary on data files from FCV 4.2, the following messages appear in the log:&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;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;2018-10-04T08:40:21.447-0400 F STORAGE  [initandlisten] BadValue: Invalid value for version, found 4.2, expected &apos;4.0&apos; or &apos;3.6&apos;. Contents of featureCompatibilityVersion document in admin.system.version: { _id: &quot;featureCompatibilityVersion&quot;, version: &quot;4.2&quot; }. See http://dochub.mongodb.org/core/4.0-feature-compatibility.&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;2018-10-04T08:40:21.447-0400 F CONTROL  [initandlisten] ** IMPORTANT: UPGRADE PROBLEM: Unable to parse the featureCompatibilityVersion document. The data files need to be fully upgraded to version 3.6 before attempting an upgrade to 4.0. If you are upgrading to 4.0, see http://dochub.mongodb.org/core/4.0-upgrade-fcv.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="613999">SERVER-37472</key>
            <summary>Improve behavior if user downgrades to 4.0 binary without setting FCV to 4.0</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="natalie.tsvetkova@mongodb.com">Natalie Tsvetkova</assignee>
                                    <reporter username="milkie@mongodb.com">Eric Milkie</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Thu, 4 Oct 2018 12:43:56 +0000</created>
                <updated>Sun, 29 Oct 2023 22:27:38 +0000</updated>
                            <resolved>Fri, 2 Nov 2018 15:32:32 +0000</resolved>
                                    <version>4.0.3</version>
                                    <fixVersion>4.0.5</fixVersion>
                    <fixVersion>4.1.5</fixVersion>
                                    <component>Upgrade/Downgrade</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="2060244" author="xgen-internal-githook" created="Tue, 13 Nov 2018 16:35:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;natalie.tsvetkova&apos;, &apos;email&apos;: &apos;natalie.tsvetkova@mongodb.com&apos;, &apos;username&apos;: &apos;ntsvetko&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37472&quot; title=&quot;Improve behavior if user downgrades to 4.0 binary without setting FCV to 4.0&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37472&quot;&gt;&lt;del&gt;SERVER-37472&lt;/del&gt;&lt;/a&gt;: Improve behavior if user downgrades to 4.0 binary without setting FCV to 4.0&lt;/p&gt;

&lt;p&gt;(cherry picked from commit bda182eaab096c34f57efe94f5e0a8022c54bcc3)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d8fb9151e857590b80f4bb8dea82e6782e534ef8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d8fb9151e857590b80f4bb8dea82e6782e534ef8&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2047957" author="xgen-internal-githook" created="Wed, 31 Oct 2018 19:12:32 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;natalie.tsvetkova&apos;, &apos;email&apos;: &apos;natalie.tsvetkova@mongodb.com&apos;, &apos;username&apos;: &apos;ntsvetko&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37472&quot; title=&quot;Improve behavior if user downgrades to 4.0 binary without setting FCV to 4.0&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37472&quot;&gt;&lt;del&gt;SERVER-37472&lt;/del&gt;&lt;/a&gt;: Improve behavior if user downgrades to 4.0 binary without setting FCV to 4.0&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bda182eaab096c34f57efe94f5e0a8022c54bcc3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bda182eaab096c34f57efe94f5e0a8022c54bcc3&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2024853" author="milkie" created="Fri, 5 Oct 2018 12:39:09 +0000"  >&lt;p&gt;Something like that, yes.  At the very minimum, we shouldn&apos;t print the message about having upgraded from prior to 3.6.&lt;/p&gt;</comment>
                            <comment id="2024691" author="kaloian.manassiev" created="Fri, 5 Oct 2018 06:52:50 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=milkie&quot; class=&quot;user-hover&quot; rel=&quot;milkie&quot;&gt;milkie&lt;/a&gt;, the messaging improvement you have in mind here would be to make it say something like this, right:&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;
		&lt;tbody &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-top: 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;You must have downgraded your binaries without downgrading your FCV to a version, which is supported to that binary. Please restart using the version supporting FCV in question and follow the downgrade instructions from the documentation&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;</comment>
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