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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-15156] MongoDB upgrade 2.4 to 2.6 check returns error in config.changelog collection</title>
                <link>https://jira.mongodb.org/browse/SERVER-15156</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In running the db.upgradeCheckAllDBs() command to check for issues in order to upgrade from MongoDB 2.4 to 2.6, an error is reported: &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;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;Checking collection config.changelog&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;   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;Collection Error: lack of _id index on collection: config.changelog&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;I don&apos;t think the _id index check should occur on collections in the config database, right? This check is skipped for several other internal collections. &lt;/p&gt;

&lt;p&gt;Is it safe to ignore this error and move forward with the upgrade if no other errors are reported?&lt;/p&gt;</description>
                <environment></environment>
        <key id="156625">SERVER-15156</key>
            <summary>MongoDB upgrade 2.4 to 2.6 check returns error in config.changelog collection</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="matt.dannenberg">Matt Dannenberg</assignee>
                                    <reporter username="jason@cloudwords.com">Jason Buchanan</reporter>
                        <labels>
                    </labels>
                <created>Fri, 5 Sep 2014 17:54:11 +0000</created>
                <updated>Wed, 11 Mar 2015 16:57:49 +0000</updated>
                            <resolved>Tue, 9 Sep 2014 14:32:41 +0000</resolved>
                                    <version>2.6.0</version>
                                    <fixVersion>2.6.5</fixVersion>
                    <fixVersion>2.7.7</fixVersion>
                                    <component>Admin</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="715908" author="xgen-internal-githook" created="Wed, 10 Sep 2014 17:24:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dannenberg&apos;, u&apos;name&apos;: u&apos;matt dannenberg&apos;, u&apos;email&apos;: u&apos;matt.dannenberg@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15156&quot; title=&quot;MongoDB upgrade 2.4 to 2.6 check returns error in config.changelog collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15156&quot;&gt;&lt;del&gt;SERVER-15156&lt;/del&gt;&lt;/a&gt; skip _id index checks on the config db in the upgradeChecker()&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 4da87914c4ad2b3ca34cd0008a57faa2c068db85)&lt;br/&gt;
Branch: v2.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7f085a7cd723ca6045e430d367e592879d92d994&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7f085a7cd723ca6045e430d367e592879d92d994&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="714536" author="xgen-internal-githook" created="Tue, 9 Sep 2014 14:32:16 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dannenberg&apos;, u&apos;name&apos;: u&apos;matt dannenberg&apos;, u&apos;email&apos;: u&apos;matt.dannenberg@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15156&quot; title=&quot;MongoDB upgrade 2.4 to 2.6 check returns error in config.changelog collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15156&quot;&gt;&lt;del&gt;SERVER-15156&lt;/del&gt;&lt;/a&gt; skip _id index checks on the config db in the upgradeChecker()&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4da87914c4ad2b3ca34cd0008a57faa2c068db85&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4da87914c4ad2b3ca34cd0008a57faa2c068db85&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="713185" author="jason@cloudwords.com" created="Sun, 7 Sep 2014 20:34:13 +0000"  >&lt;p&gt;Dan,&lt;/p&gt;

&lt;p&gt;Yes, this shared cluster was created with mongodb version 2.0, maybe even 1.8. Will ignore the error and proceed. Thanks!&lt;/p&gt;</comment>
                            <comment id="713016" author="dan@10gen.com" created="Sat, 6 Sep 2014 14:55:36 +0000"  >&lt;p&gt;Jason,&lt;br/&gt;
This is a bug in the upgrade script and can be ignored.   For the changelog collection, there is no harm in not having this index.  Since v2.2, all capped collections are created with an &lt;tt&gt;_id&lt;/tt&gt; index by default.  Was this sharded cluster created with a version of mongodb before 2.2?&lt;/p&gt;</comment>
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