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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-10939] Add change to {getParameter: 1, featureCompatibilityVersion: 1} for Server 3.6</title>
                <link>https://jira.mongodb.org/browse/DOCS-10939</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;After &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31630&quot; title=&quot;getParameter for featureCompatibilityVersion must expose targetVersion&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31630&quot;&gt;&lt;del&gt;SERVER-31630&lt;/del&gt;&lt;/a&gt;, the output of {&lt;tt&gt;getParameter: 1, featureCompatibilityVersion: 1&lt;/tt&gt;} on a 3.6 mongod can have four possible returns:&lt;/p&gt;

&lt;p&gt;Fully downgraded featureCompatibilityVersion:&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;{featureCompatibilityVersion: {version: &quot;3.4&quot;}, ok: 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;Upgrading featureCompatibilityVersion:&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;{featureCompatibilityVersion: {version: &quot;3.4&quot;, targetVersion: &quot;3.6&quot;}, ok: 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;Downgrading featureCompatibilityVersion:&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;{featureCompatibilityVersion: {version: &quot;3.4&quot;, targetVersion: &quot;3.4&quot;}, ok: 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;Fully upgraded featureCompatibilityVersion:&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;{featureCompatibilityVersion: {version: &quot;3.6&quot;}, ok: 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;We should document the change to the &lt;tt&gt;getParameter&lt;/tt&gt; output. We should also include in the downgrade instructions to wait for each node to have &lt;b&gt;fully&lt;/b&gt; downgraded featureCompatibilityVersion before replacing the binary.&lt;/p&gt;</description>
                <environment></environment>
        <key id="450292">DOCS-10939</key>
            <summary>Add change to {getParameter: 1, featureCompatibilityVersion: 1} for Server 3.6</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="tess.avitabile@mongodb.com">Tess Avitabile</reporter>
                        <labels>
                    </labels>
                <created>Tue, 24 Oct 2017 22:07:36 +0000</created>
                <updated>Sun, 29 Oct 2023 13:58:55 +0000</updated>
                            <resolved>Wed, 15 Nov 2017 21:42:57 +0000</resolved>
                                                    <fixVersion>3.6.0-rc2</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1727008" author="xgen-internal-githook" created="Wed, 15 Nov 2017 21:42:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;kay&apos;, &apos;username&apos;: &apos;kay-kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-10939&quot; title=&quot;Add change to {getParameter: 1, featureCompatibilityVersion: 1} for Server 3.6&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-10939&quot;&gt;&lt;del&gt;DOCS-10939&lt;/del&gt;&lt;/a&gt;: fcv value&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/ea9df136bb8ff1b287d72a8844a1cca4a4e1bfa1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/ea9df136bb8ff1b287d72a8844a1cca4a4e1bfa1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1724047" author="kay.kim@10gen.com" created="Mon, 13 Nov 2017 15:55:01 +0000"  >&lt;p&gt;Thanks much.  Will try that.&lt;/p&gt;</comment>
                            <comment id="1723977" author="tess.avitabile" created="Mon, 13 Nov 2017 14:57:38 +0000"  >&lt;p&gt;It is hard to see the &lt;tt&gt;targetVersion&lt;/tt&gt; in the &lt;tt&gt;getParameter&lt;/tt&gt; output, since usually we proceed immediately into the fully upgraded or fully downgraded state. &lt;/p&gt;

&lt;p&gt;One way you can be sure to see it is by doing a direct write to &lt;tt&gt;admin.system.version&lt;/tt&gt;, as in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c298f081852f1fc1ae4a51ed8997bd0fd15bb5aa/jstests/noPassthrough/feature_compatibility_version.js&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this test&lt;/a&gt;. Of course, we don&apos;t want users to write directly to &lt;tt&gt;admin.system.version&lt;/tt&gt;, but this will allow you to observe the &lt;tt&gt;targetVersion&lt;/tt&gt; in the &lt;tt&gt;getParameter&lt;/tt&gt; output.&lt;/p&gt;

&lt;p&gt;How you might see it in the real world is when the config primary can&apos;t connect to one of the shards during upgrade or downgrade, so it cannot complete the upgrade or downgrade process. We simulate that in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c298f081852f1fc1ae4a51ed8997bd0fd15bb5aa/jstests/multiVersion/set_feature_compatibility_version.js#L463&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this test&lt;/a&gt;.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10320">
                    <name>Documented</name>
                                            <outwardlinks description="documents">
                                        <issuelink>
            <issuekey id="447838">SERVER-31630</issuekey>
        </issuelink>
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