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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[DOCS-2910] Upgrade instructions for 2.6 should warn about new behavior of ensureIndex</title>
                <link>https://jira.mongodb.org/browse/DOCS-2910</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;Many application frameworks perform the following action on startup:  for every model object in the application, verify that the necessary indexes are in place by calling &lt;tt&gt;ensureIndex&lt;/tt&gt; for each associated index.&lt;/p&gt;

&lt;p&gt;Prior to 2.6 &lt;tt&gt;ensureIndex&lt;/tt&gt; was (annoyingly) forgiving.  If you had previously defined the an index &lt;tt&gt;foo&lt;/tt&gt; to be &lt;tt&gt;name,1&lt;/tt&gt; and then later you changed your code and defined it as &lt;tt&gt;username,1&lt;/tt&gt;, when you re-ensured the index it would just silently do nothing.&lt;/p&gt;

&lt;p&gt;The 2.6 version of &lt;tt&gt;ensureIndex&lt;/tt&gt; is stricter (yay!).  However, this may cause many application developers off guard when doing the upgrade.  If they have any indexes in their dbs that are &lt;b&gt;not&lt;/b&gt; in tune with the &lt;tt&gt;ensureIndex&lt;/tt&gt; commands executed by their framework, their applications will fail to start up.   The previous forgiving nature of &lt;tt&gt;ensureIndex&lt;/tt&gt; will unfortunately make this a common issue.&lt;/p&gt;</description>
                <environment></environment>
        <key id="120333">DOCS-2910</key>
            <summary>Upgrade instructions for 2.6 should warn about new behavior of ensureIndex</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="9">Done</resolution>
                                        <assignee username="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="cailin.nelson@mongodb.com">Cailin Nelson</reporter>
                        <labels>
                            <label>sprint-slipstream</label>
                    </labels>
                <created>Thu, 13 Mar 2014 21:09:07 +0000</created>
                <updated>Sat, 15 Mar 2014 14:11:50 +0000</updated>
                            <resolved>Sat, 15 Mar 2014 14:11:43 +0000</resolved>
                                                    <fixVersion>v1.3.2</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="516729" author="xgen-internal-githook" created="Sat, 15 Mar 2014 14:11:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kay-kim&apos;, u&apos;name&apos;: u&apos;kay&apos;, u&apos;email&apos;: u&apos;kay.kim@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-2910&quot; title=&quot;Upgrade instructions for 2.6 should warn about new behavior of ensureIndex&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-2910&quot;&gt;&lt;del&gt;DOCS-2910&lt;/del&gt;&lt;/a&gt; ensureIndex with name but diff key spec&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/f48e792513aae2db0f3c9492599da28d04b927e5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/f48e792513aae2db0f3c9492599da28d04b927e5&lt;/a&gt;&lt;/p&gt;</comment>
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