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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-10470] per-db replication configuration / state (per-db master, etc)</title>
                <link>https://jira.mongodb.org/browse/SERVER-10470</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, each Replica Set has exactly one master at any time. Reads may be performed by slaves, but writes always go to the master.&lt;/p&gt;

&lt;p&gt;It may be advantageous to allow this master-slave preference to be controlled per-DB. For example:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;DB: &quot;global&quot;; replicaSet: no-preferred master&lt;/li&gt;
	&lt;li&gt;DB: &quot;usa&quot;; replicaSet: prefer USA-located replica members to be master&lt;/li&gt;
	&lt;li&gt;DB: &quot;asia&quot;; replicaSet: prefer Asia-located replica members to be master&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;This would allow a single known-working cluster to be used for multiple region-specific purposes without needing to create and maintain region-specific clusters.&lt;/p&gt;</description>
                <environment></environment>
        <key id="85254">SERVER-10470</key>
            <summary>per-db replication configuration / state (per-db master, etc)</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="jokeyrhyme">Ron Waldon</reporter>
                        <labels>
                            <label>replicaset</label>
                            <label>replication</label>
                            <label>sharding</label>
                    </labels>
                <created>Fri, 9 Aug 2013 02:22:53 +0000</created>
                <updated>Wed, 10 Dec 2014 23:15:34 +0000</updated>
                            <resolved>Mon, 12 Aug 2013 13:56:28 +0000</resolved>
                                                                    <component>Replication</component>
                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="400986" author="eliot" created="Mon, 12 Aug 2013 13:56:28 +0000"  >&lt;p&gt;I don&apos;t think db level settings for this make sense.&lt;/p&gt;

&lt;p&gt;You can do this with sharding and 1 replica set per geography.&lt;br/&gt;
In that model you can even do it in 1 collection with tagged sharding.&lt;/p&gt;

&lt;p&gt;We are working on tools to make setting that up simpler.&lt;/p&gt;

&lt;p&gt;Note: you can run all the replica sets on the same hardware, so shouldn&apos;t be more costly.&lt;/p&gt;</comment>
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