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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-3589] server downgrade doesn&apos;t handle new index version</title>
                <link>https://jira.mongodb.org/browse/SERVER-3589</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The docs and qa bug indicate that a downgrade should fail, or that at least operations against a newer index format should fail:&lt;br/&gt;
&lt;a href=&quot;http://www.mongodb.org/display/DOCS/Index+Versions#IndexVersions-RollingBacktoMongoDB%3Cv2.0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.mongodb.org/display/DOCS/Index+Versions#IndexVersions-RollingBacktoMongoDB%3Cv2.0&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Create a collection with an index on it and verify new index version format:&lt;/p&gt;

&lt;p&gt;db = db.getSisterDB(&quot;qadb&quot;);&lt;/p&gt;

&lt;p&gt;db.idx1.drop();&lt;br/&gt;
db.idx1.save(&lt;/p&gt;
{a:1, b:1}
&lt;p&gt;);&lt;br/&gt;
db.idx1.ensureIndex(&lt;/p&gt;
{a:1, b:1}
&lt;p&gt;);&lt;/p&gt;

&lt;p&gt;var idxlist = db.idx1.getIndexes();&lt;br/&gt;
idxlist;&lt;br/&gt;
// note v:1 indexes&lt;/p&gt;

&lt;p&gt;downloaded 1.8.2.  start it on the same database files.  mongod starts up normally.&lt;br/&gt;
I issued some queries, the last of which should use the index.  Note that query does not return an error as specified in the docs, but it also doesn&apos;t return the correct result:&lt;/p&gt;

&lt;p&gt;&amp;gt; use qadb&lt;br/&gt;
switched to db qadb&lt;br/&gt;
&amp;gt; db.idx1.find();&lt;/p&gt;
{ &quot;_id&quot; : ObjectId(&quot;4e445314fb3e65e39a74d26c&quot;), &quot;a&quot; : 1, &quot;b&quot; : 1 }
&lt;p&gt;&amp;gt; db.idx1.find(&lt;/p&gt;
{b:1}
&lt;p&gt;);&lt;/p&gt;
{ &quot;_id&quot; : ObjectId(&quot;4e445314fb3e65e39a74d26c&quot;), &quot;a&quot; : 1, &quot;b&quot; : 1 }
&lt;p&gt;&amp;gt; db.idx1.find(&lt;/p&gt;
{a:1}
&lt;p&gt;);&lt;br/&gt;
&amp;gt; db.idx1.getIndexes();&lt;br/&gt;
[&lt;br/&gt;
        {&lt;br/&gt;
                &quot;v&quot; : 1,&lt;br/&gt;
                &quot;key&quot; : &lt;/p&gt;
{
                        &quot;_id&quot; : 1
                }
&lt;p&gt;,&lt;br/&gt;
                &quot;ns&quot; : &quot;qadb.idx1&quot;,&lt;br/&gt;
                &quot;name&quot; : &quot;&lt;em&gt;id&lt;/em&gt;&quot;&lt;br/&gt;
        },&lt;br/&gt;
        {&lt;br/&gt;
                &quot;v&quot; : 1,&lt;br/&gt;
                &quot;key&quot; : &lt;/p&gt;
{
                        &quot;a&quot; : 1,
                        &quot;b&quot; : 1
                }
&lt;p&gt;,&lt;br/&gt;
                &quot;ns&quot; : &quot;qadb.idx1&quot;,&lt;br/&gt;
                &quot;name&quot; : &quot;a_1_b_1&quot;&lt;br/&gt;
        }&lt;br/&gt;
]&lt;br/&gt;
&amp;gt;&lt;/p&gt;</description>
                <environment>Tested on Vista 64</environment>
        <key id="20939">SERVER-3589</key>
            <summary>server downgrade doesn&apos;t handle new index version</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="9">Done</resolution>
                                        <assignee username="eliot">Eliot Horowitz</assignee>
                                    <reporter username="cwestin">Chris Westin</reporter>
                        <labels>
                    </labels>
                <created>Fri, 12 Aug 2011 21:04:24 +0000</created>
                <updated>Mon, 11 Jul 2016 18:35:44 +0000</updated>
                            <resolved>Wed, 17 Aug 2011 15:22:33 +0000</resolved>
                                    <version>1.9.1</version>
                                    <fixVersion>1.8.3</fixVersion>
                                    <component>Index Maintenance</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="49018" author="auto" created="Wed, 17 Aug 2011 15:22:28 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: better handling of new index versions &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3589&quot; title=&quot;server downgrade doesn&amp;#39;t handle new index version&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3589&quot;&gt;&lt;del&gt;SERVER-3589&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: v1.8&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d4435681b510407cf2ba83f338a3a925efaeb1ec&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d4435681b510407cf2ba83f338a3a925efaeb1ec&lt;/a&gt;&lt;/p&gt;</comment>
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