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            <title>[DOCS-847] need to doc upgrade of cluster from v2.2 to v2.4 format</title>
                <link>https://jira.mongodb.org/browse/DOCS-847</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;As part of an upgrade of a cluster from v2.2 to v2.4, the config database will need to be upgraded and epochs added to all collections (to support &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-939&quot; title=&quot;Ability to distribute collections in a single db&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-939&quot;&gt;SERVER-939&lt;/a&gt;).  v2.2 is backwards-compatible with these changes, however v2.0 is not.  In order to migrate the cluster, a single v2.4 mongos must be started with --upgrade, and no collection metadata changes (adding shards, dropping databases, dropping collections) can happen while the upgrade is in progress.&lt;/p&gt;

&lt;p&gt;We need to doc this upgrade process for 2.3.2/2.4.&lt;/p&gt;</description>
                <environment></environment>
        <key id="58377">DOCS-847</key>
            <summary>need to doc upgrade of cluster from v2.2 to v2.4 format</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>
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                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="sam.kleinman">Sam Kleinman</assignee>
                                    <reporter username="greg_10gen">Greg Studer</reporter>
                        <labels>
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                <created>Wed, 5 Dec 2012 16:09:14 +0000</created>
                <updated>Sun, 6 Jan 2013 02:55:00 +0000</updated>
                            <resolved>Sun, 6 Jan 2013 02:54:30 +0000</resolved>
                                                                        <due></due>
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                                                                                                                <comments>
                            <comment id="232121" author="samk" created="Sun, 6 Jan 2013 02:55:00 +0000"  >&lt;p&gt;marking 847 as the duplicate as 929 has more information. &lt;/p&gt;</comment>
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