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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>[DOCS-1714] Please improve the documentation about meta data upgrade from 2.2 to 2.4 in a Sharded enviroment</title>
                <link>https://jira.mongodb.org/browse/DOCS-1714</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;A user raised an issue yesterday with questions about the meta-data upgrade procedure when upgrading from 2.2 to 2.4. The documentation is &lt;a href=&quot;http://docs.mongodb.org/manual/release-notes/2.4-upgrade/#meta-data-upgrade-procedure&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;. While most of the documentation is straightforward and self-explanatory, this section might need a revisit:&lt;/p&gt;

&lt;blockquote&gt;&lt;p&gt;If any index on the config database is {v:0}, you should drop that index using db.collection.dropIndex(), and then rebuild it with db.collection.ensureIndex(). This does not apply to indexes on other databases in the cluster. If you need to upgrade the _id index to {v:1} use the db.collection.reIndex().&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;Specifically:&lt;br/&gt;
1. Is it necessary to drop &amp;amp; recreate indexes instead of just running db.collection.reIndex() on all collections which contain &lt;/p&gt;
{v:0}
&lt;p&gt; indexes?&lt;br/&gt;
2. Explicitly mention that customers should do this once on the mongos which would then propagate to all configsvrs. The customer thought he had to do it once on each configsvr by connecting directly to it =&amp;gt; this is very error prone.&lt;/p&gt;

&lt;p&gt;Please let me know if this makes sense.&lt;/p&gt;

&lt;p&gt;Thanks, Angshuman&lt;/p&gt;</description>
                <environment></environment>
        <key id="82464">DOCS-1714</key>
            <summary>Please improve the documentation about meta data upgrade from 2.2 to 2.4 in a Sharded enviroment</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="sam.kleinman">Sam Kleinman</assignee>
                                    <reporter username="angshuman.bagchi@mongodb.com">Angshuman Bagchi</reporter>
                        <labels>
                    </labels>
                <created>Tue, 16 Jul 2013 18:52:12 +0000</created>
                <updated>Tue, 16 Jul 2013 20:46:15 +0000</updated>
                            <resolved>Tue, 16 Jul 2013 19:31:29 +0000</resolved>
                                                                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="382482" author="samk" created="Tue, 16 Jul 2013 20:46:15 +0000"  >&lt;p&gt;I think the current text which includes your change Asya (and some minor tweaks from me,) addresses all of these concerns. &lt;/p&gt;</comment>
                            <comment id="382480" author="asya" created="Tue, 16 Jul 2013 20:40:48 +0000"  >&lt;p&gt;The problem is that when there is only one v:0 index it&apos;s the _id index (config collections mostly only have one index each).&lt;/p&gt;

&lt;p&gt;Angshuman: note that that issue was opened before I submitted a pull request to update this page so what you see now is not what it said before - before it didn&apos;t even mention _id index or reIndex.&lt;/p&gt;

&lt;p&gt;It&apos;s true we should probably say they should do this through mongos.  It&apos;s bizarre they would think they need to do this on each config server - since there is &lt;b&gt;nothing&lt;/b&gt; we proscribe be done on individual config servers.&lt;/p&gt;</comment>
                            <comment id="382408" author="auto" created="Tue, 16 Jul 2013 19:31:28 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;tychoish&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-1714&quot; title=&quot;Please improve the documentation about meta data upgrade from 2.2 to 2.4 in a Sharded enviroment&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-1714&quot;&gt;&lt;del&gt;DOCS-1714&lt;/del&gt;&lt;/a&gt;: 2.4 upgrade index issue&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/554a06ccd92d2e6c577a6751444233f72e4d3981&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/554a06ccd92d2e6c577a6751444233f72e4d3981&lt;/a&gt;&lt;/p&gt;</comment>
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