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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-9112] Config Servers as replica set</title>
                <link>https://jira.mongodb.org/browse/SERVER-9112</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The config servers have a crucial role over sharding since they hold the mapping information of all moving pieces of a shard cluster. &lt;br/&gt;
For several use cases the current behavior of config servers can be quite limiting due to 2 aspects:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Strick number of members
	&lt;ul&gt;
		&lt;li&gt;can impact multiple datacenter deployments&lt;/li&gt;
		&lt;li&gt;specially on slow networks&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
	&lt;li&gt;Failover of members
	&lt;ul&gt;
		&lt;li&gt;needs to have all 3 always online otherwise the cluster may encounter problems booting up mongos&apos;s&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Due to historic and mathematical reasons the config servers have the current hard number of 3 members. &lt;br/&gt;
Setting them as replicas with enforced Write Concerns for balancer locking and migration operations we can achieve a more flexible shard cluster.&lt;br/&gt;
Also the current hard setting creates some confusion on clients and generates a bit of unrest while configuring a sharding environment.&lt;/p&gt;</description>
                <environment></environment>
        <key id="69615">SERVER-9112</key>
            <summary>Config Servers as replica set</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="norberto.leite">Norberto Fernando Rocha Leite</reporter>
                        <labels>
                            <label>sharded-cluster</label>
                    </labels>
                <created>Mon, 25 Mar 2013 13:48:58 +0000</created>
                <updated>Thu, 28 Mar 2013 19:57:40 +0000</updated>
                            <resolved>Mon, 25 Mar 2013 14:01:24 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>1</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="297813" author="eliot" created="Mon, 25 Mar 2013 14:01:24 +0000"  >&lt;p&gt;See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1448&quot; title=&quot;Host sharding config data on a replica set&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1448&quot;&gt;&lt;del&gt;SERVER-1448&lt;/del&gt;&lt;/a&gt;, but the answer is most likely no.&lt;br/&gt;
There are other considerations that make replica sets a bad choice.&lt;/p&gt;</comment>
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