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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>[CDRIVER-1963] Better error message for featureCompatibilityVersion</title>
                <link>https://jira.mongodb.org/browse/CDRIVER-1963</link>
                <project id="10030" key="CDRIVER">C Driver</project>
                    <description>&lt;p&gt;I tried inserting some dec128 into mongo. This immediately kills the connection with a not so helpful error message: &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;
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					&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;Failed to send &quot;insert&quot; command with database &quot;test&quot;: socket error or timeout&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;Looking in the mongod log files the real problem is this:&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;2016-12-21T16:39:42.585+0100 I -        [conn344] AssertionException handling request, closing client connection: 22 Client Error: bad object in message: Cannot use decimal BSON type when the featureCompatibilityVersion is 3.2. See http://dochub.mongodb.org/core/3.4-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;2016-12-21T16:39:42.585+0100 I -        [conn344] end connection 127.0.0.1:61918 (1 connection now open)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Is it expected that the connection is killed when inserting dec128 in mongo 3.2? Perhaps the C driver could return a more helpful error message, something that hints at featureCompatibilityVersion? How should I request featureCompatibilityVersion 3.4 in the client?&lt;/p&gt;</description>
                <environment></environment>
        <key id="340364">CDRIVER-1963</key>
            <summary>Better error message for featureCompatibilityVersion</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="13202">Works as Designed</resolution>
                                        <assignee username="bjori">Hannes Magnusson</assignee>
                                    <reporter username="Jeroenooms">Jeroen Ooms [X]</reporter>
                        <labels>
                    </labels>
                <created>Wed, 21 Dec 2016 15:44:00 +0000</created>
                <updated>Fri, 27 Oct 2023 13:14:22 +0000</updated>
                            <resolved>Wed, 21 Dec 2016 16:25:17 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1463177" author="bjori" created="Wed, 21 Dec 2016 16:25:17 +0000"  >&lt;p&gt;&lt;tt&gt;featureCompatibilityVersion&lt;/tt&gt; is a setting on the mongoD which allows you to rollback an upgrade if required.&lt;br/&gt;
After upgrading you should set the appropriate &lt;tt&gt;featureCompatibilityVersion&lt;/tt&gt; to enable 3.4 features.&lt;br/&gt;
See: &lt;a href=&quot;https://docs.mongodb.com/manual/reference/command/setFeatureCompatibilityVersion/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/reference/command/setFeatureCompatibilityVersion/&lt;/a&gt;&lt;/p&gt;


&lt;p&gt;The server closes the connections without error message so there isn&apos;t much we can do about it.&lt;/p&gt;</comment>
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