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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-26087] _configsvrSetFeatureCompatibilityVersion should only set its own state if setFeatureCompatibilityVersion succeeded on all shards</title>
                <link>https://jira.mongodb.org/browse/SERVER-26087</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The mongos implementation of &lt;tt&gt;setFeatureCompatibilityVersion&lt;/tt&gt; works simply by calling the internal &lt;tt&gt;_configsvrSetFeatureCompatibilityVersion&lt;/tt&gt; command on the primary shard of the config server replica set. In the implementation of this internal command, the config server does 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;
		&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;   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;// Set featureCompatibilityVersion on self.&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;FeatureCompatibilityVersion::set(txn, version);&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;&amp;nbsp;&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;// Forward to all shards.&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;uassertStatusOK(Grid::get(txn)-&amp;gt;catalogManager()-&amp;gt;setFeatureCompatibilityVersionOnShards(txn, version));&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;&amp;nbsp;&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;return true;&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;Namely, it sets its own state and then forwards the sFCV() command to all shards, failing if any of the shards fail. This leads to the following problem scenario:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Mongos sFCV(&quot;3.4&quot;) calls _configsvfSFCV(&quot;3.4&quot;) on the primary shard of the config server replica set.&lt;/li&gt;
	&lt;li&gt;The config server successfully sets its own state to &quot;3.4&quot;.&lt;/li&gt;
	&lt;li&gt;Due to, say, a network problem, sFCV() on one of the shards fails.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Now the config server primary will report &quot;3.4&quot; as its feature compatibility version, even if sFCV(&quot;3.4&quot;) did not succeed cluster-wide.&lt;/p&gt;

&lt;p&gt;In order to allow the config server primary to act as the cluster&apos;s source of truth for the current feature compatibility version, it should set its own state only after all shards have returned successfully from sFCV().&lt;/p&gt;</description>
                <environment></environment>
        <key id="315938">SERVER-26087</key>
            <summary>_configsvrSetFeatureCompatibilityVersion should only set its own state if setFeatureCompatibilityVersion succeeded on all shards</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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>
                    </labels>
                <created>Tue, 13 Sep 2016 17:30:11 +0000</created>
                <updated>Sat, 19 Nov 2016 00:05:16 +0000</updated>
                            <resolved>Wed, 14 Sep 2016 18:45:59 +0000</resolved>
                                                    <fixVersion>3.3.14</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1384562" author="xgen-internal-githook" created="Wed, 14 Sep 2016 18:45:23 +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-26087&quot; title=&quot;_configsvrSetFeatureCompatibilityVersion should only set its own state if setFeatureCompatibilityVersion succeeded on all shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26087&quot;&gt;&lt;del&gt;SERVER-26087&lt;/del&gt;&lt;/a&gt; make config server only set its own featureCompatibilityVersion if all shards report success&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/63582d3c291235d11e7597d659bdfe365bdac158&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/63582d3c291235d11e7597d659bdfe365bdac158&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1383499" author="david.storch" created="Tue, 13 Sep 2016 17:41:09 +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;, this would be nice, but I&apos;m not sure if it would be worthwhile to invest the engineering effort. The user can re-run sFCV() against the mongos whenever it fails in order to obtain a consistent state across the cluster.&lt;/p&gt;</comment>
                            <comment id="1383490" author="milkie" created="Tue, 13 Sep 2016 17:37:44 +0000"  >&lt;p&gt;If setting the feature version fails on one of the shards, should the code attempt to undo the setting on the rest of the cluster?  Otherwise you might be left with an unclean state across shards.&lt;/p&gt;</comment>
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