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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-22936] Zero-downtime upgrade from mirrored (SCCC) to replica set (CSRS) config servers</title>
                <link>https://jira.mongodb.org/browse/SERVER-22936</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;div class=&quot;panel&quot; style=&quot;background-color: #EEEEEE;border-color: #ccc;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;border-bottom-color: #ccc;background-color: #6CB33F;&quot;&gt;&lt;b&gt;Issue Status as of Mar 02, 2016&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #EEEEEE;&quot;&gt;
&lt;p&gt;&lt;b&gt;ISSUE SUMMARY&lt;/b&gt;&lt;br/&gt;
MongoDB version 3.2 introduces the ability to run &lt;a href=&quot;https://docs.mongodb.org/manual/core/sharded-cluster-config-servers/#replica-set-config-servers&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Replica Set Config Servers&lt;/a&gt; (also referred to as &quot;config servers as replica sets&quot;, or running in CSRS mode).  This feature provides stronger consistency guarantees, easier management, better support for multi-datacenter deployments, and the ability to run more than 3 config servers.&lt;/p&gt;

&lt;p&gt;Upgrading the config servers to be replica sets is recommended for all users running MongoDB version 3.2, and will be required before moving to the forthcoming version 3.4 release. The legacy &apos;mirrored&apos; configuration for replica sets will not be supported starting in MongoDB version 3.4.&lt;/p&gt;

&lt;p&gt;While it was possible to upgrade existing deployments from the old &apos;mirrored&apos; deployment model to CSRS in versions MongoDB versions 3.2.0 to 3.2.3, doing so required taking cluster-wide downtime.  Starting in version 3.2.4 it is possible to upgrade your existing sharded cluster to CSRS mode without incurring downtime.&lt;/p&gt;

&lt;p&gt;To start using &lt;a href=&quot;https://docs.mongodb.org/manual/core/sharded-cluster-config-servers/#replica-set-config-servers&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Replica Set Config Servers&lt;/a&gt; in your MongoDB 3.2 cluster please see &lt;a href=&quot;https://docs.mongodb.org/manual/tutorial/upgrade-config-servers-to-replica-set/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the upgrade documentation&lt;/a&gt;.&lt;/p&gt;
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        <key id="269528">SERVER-22936</key>
            <summary>Zero-downtime upgrade from mirrored (SCCC) to replica set (CSRS) config servers</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="spencer@mongodb.com">Spencer Brody</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                            <label>code-and-test</label>
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                <created>Wed, 2 Mar 2016 22:49:59 +0000</created>
                <updated>Wed, 19 Jul 2017 15:48:13 +0000</updated>
                            <resolved>Wed, 2 Mar 2016 22:52:45 +0000</resolved>
                                                    <fixVersion>3.2.4</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
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