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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>
    </build-info>


<item>
            <title>[DOCS-10777] 3.2 users reading 3.4 version of createIndex should be warned specifying collation is a silent, but upgrade-blocking, error.</title>
                <link>https://jira.mongodb.org/browse/DOCS-10777</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;A 3.2 user can create an index with a &quot;collation&quot; option. It succeeds, even though collation is not supported in 3.2. I.e. it seems to be silently ignored.&lt;/p&gt;

&lt;p/&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;2017-09-12T12:42:10.774+1000 I CONTROL  [initandlisten] MongoDB starting : pid=5962 port=27017 dbpath=/tmp/data 64-bit host=10gensyd2&lt;/span&gt;&lt;/pre&gt;
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						&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;2017-09-12T12:42:10.774+1000 I CONTROL  [initandlisten] db version v3.2.10&lt;/span&gt;&lt;/pre&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;
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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;2017-09-12T12:53:19.782+1000 I NETWORK  [initandlisten] connection accepted from 127.0.0.1:36858 #2 (1 connection now open)&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;2017-09-12T13:06:16.784+1000 I INDEX    [conn2] build index on: product.foo properties: { v: 1, key: { orderDate: 1.0, category: 1.0 }, name: &quot;date_category_fr&quot;, ns: &quot;product.foo&quot;, collation: { locale: &quot;fr&quot;, strength: 2.0 } }&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;2017-09-12T13:06:16.784+1000 I INDEX    [conn2]          building index using bulk method&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;2017-09-12T13:06:16.785+1000 I INDEX    [conn2] build index done.  scanned 0 total records. 0 secs&lt;/span&gt;&lt;/pre&gt;
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		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;The problem is when they upgrade 3.4. As they do an in-place, binary-version only upgrade the 3.4 mongod will not be running in &quot;3.4&quot; feature compatibility mode at first. In this mode it strictly checks that indexes are 3.2 compatible, and exits with &quot;Fatal Assertion 28782&quot; when it finds the index with the collation:&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;
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						&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;2017-09-12T13:34:31.762+1000 I CONTROL  [initandlisten] MongoDB starting : pid=6705 port=27017 dbpath=/tmp/data 64-bit host=10gensyd2&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;2017-09-12T13:34:31.762+1000 I CONTROL  [initandlisten] db version v3.4.1-126-gdd491eeb54&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;...&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;2017-09-12T13:34:31.933+1000 F INDEX    [initandlisten] Found an invalid index { v: 1, key: { orderDate: 1.0, category: 1.0 }, name: &quot;date_category_fr&quot;, ns: &quot;product.foo&quot;, collation: { locale: &quot;fr&quot;, strength: 2.0 } } on the product.foo collection: CannotCreateIndex: Index version v=1 does not support the &apos;collation&apos; option&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;2017-09-12T13:34:31.933+1000 I -        [initandlisten] Fatal Assertion 28782 at src/mongo/db/catalog/index_catalog.cpp 144&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&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;2017-09-12T13:34:31.933+1000 I -        [initandlisten]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&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;
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						&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;***aborting after fassert() failure&lt;/span&gt;&lt;/pre&gt;
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			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;I think we should add a warning, in only the 3.4 version of documentation, at the following section. &lt;a href=&quot;https://docs.mongodb.com/manual/reference/method/db.collection.createIndex/#option-for-collation&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/reference/method/db.collection.createIndex/#option-for-collation&lt;/a&gt; &lt;/p&gt;

&lt;p&gt;E.g. &apos;Warning: 3.2 users should &lt;em&gt;not&lt;/em&gt; specify collation option - it will be silently accepted but then block the upgrade to 3.4&apos;&lt;/p&gt;</description>
                <environment></environment>
        <key id="426392">DOCS-10777</key>
            <summary>3.2 users reading 3.4 version of createIndex should be warned specifying collation is a silent, but upgrade-blocking, error.</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="akira.kurogane">Akira Kurogane</reporter>
                        <labels>
                    </labels>
                <created>Tue, 12 Sep 2017 03:39:05 +0000</created>
                <updated>Sun, 29 Oct 2023 13:59:09 +0000</updated>
                            <resolved>Tue, 12 Sep 2017 13:57:40 +0000</resolved>
                                                                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1969803" author="daniele.graziani" created="Tue, 7 Aug 2018 22:50:21 +0000"  >&lt;p&gt;Also, if you create a collection in 3.2 such as:&lt;/p&gt;

&lt;p&gt;db.createCollection(&quot;testCollation&quot;,{collation: {&quot;invalid&quot;: &quot;this is an invalid collation document&quot;}})&lt;/p&gt;
{ &quot;ok&quot; : 1 }

&lt;p&gt;It will succeed but upon upgrading to 3.4 it will fail.&lt;/p&gt;</comment>
                            <comment id="1671295" author="kay.kim@10gen.com" created="Tue, 12 Sep 2017 21:54:35 +0000"  >&lt;p&gt;&lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/biggrin.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;  &lt;/p&gt;
</comment>
                            <comment id="1671292" author="akira.kurogane" created="Tue, 12 Sep 2017 21:52:36 +0000"  >&lt;p&gt;Thanks Kim!&lt;/p&gt;</comment>
                            <comment id="1670278" author="kay.kim@10gen.com" created="Tue, 12 Sep 2017 13:57:40 +0000"  >&lt;p&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;master&amp;#93;&lt;/span&gt; &lt;a href=&quot;https://github.com/mongodb/docs/commit/d35c7619c8d0a9c624c8e51bf14eebc2dd6b9061&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/d35c7619c8d0a9c624c8e51bf14eebc2dd6b9061&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;v3.4&amp;#93;&lt;/span&gt;&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/25f6d838ebb8ae64c0f301fcae5a4ee84f78d799&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/25f6d838ebb8ae64c0f301fcae5a4ee84f78d799&lt;/a&gt;&lt;/p&gt;</comment>
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