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    <title>MongoDB Jira</title>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-29231] Why was MongoDB not designed to have master-master replication ?</title>
                <link>https://jira.mongodb.org/browse/SERVER-29231</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;And why still we not have this feature ?&lt;br/&gt;
Is there really any reason that using the current replication model can be better than master-master ? like performance wise or something ?&lt;/p&gt;

&lt;p&gt;There is module that can sync data from MongoDB to MonogDB or even to any other DB like Elasticsearch ... etc&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb-labs/mongo-connector&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb-labs/mongo-connector&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Is it possible to use it to create Multi-Master Replicated MongoDB ? is it good approach?&lt;/p&gt;</description>
                <environment></environment>
        <key id="383907">SERVER-29231</key>
            <summary>Why was MongoDB not designed to have master-master replication ?</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="benishak">Wahb Ben Ishak</reporter>
                        <labels>
                    </labels>
                <created>Tue, 16 May 2017 13:59:14 +0000</created>
                <updated>Wed, 17 May 2017 07:29:25 +0000</updated>
                            <resolved>Wed, 17 May 2017 00:57:16 +0000</resolved>
                                    <version>3.5 Desired</version>
                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="1573035" author="cnstonefang" created="Wed, 17 May 2017 07:28:43 +0000"  >&lt;p&gt; @Wahb Ben Ishak an interesting suggestions.&lt;br/&gt;
actually, don&apos;t think master-master perform better than master-slave.&lt;br/&gt;
but it indeed easy to scale out.&lt;/p&gt;

&lt;p&gt;my point about this is that mongo have provided too much functions to support all DB requirement.and lose its core design brief.this cause messes when using mongo db.it want to provide RDBMS function,also provide high availbility,scale out.&lt;/p&gt;

&lt;p&gt;today mongo provide replica set deployment to meet normal data storage.and sharding cluster for large data storage.it is easy to convert replica set architect to sharding cluster deployment.but from application side,it is not easy to keep same query operation efficiency.&lt;/p&gt;

&lt;p&gt;and other things like Data engine.mongo provide MMap,WireTiger,also other third party data engine.which also cause application developer to optimize the performance.&lt;/p&gt;</comment>
                            <comment id="1572904" author="ramon.fernandez" created="Wed, 17 May 2017 00:56:49 +0000"  >&lt;p&gt;Thanks for your report &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=benishak&quot; class=&quot;user-hover&quot; rel=&quot;benishak&quot;&gt;benishak&lt;/a&gt;. Please note that the SERVER project is for reporting bugs or feature suggestions for the MongoDB server, so I&apos;m going to close this ticket.&lt;/p&gt;

&lt;p&gt;Master-master replication has been a requested feature for quite a while (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-2956&quot; title=&quot;Master-Master replication&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2956&quot;&gt;&lt;del&gt;SERVER-2956&lt;/del&gt;&lt;/a&gt;), and while it&apos;s still on the roadmap there are no specific plans for it yet. Feel free to vote for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-2956&quot; title=&quot;Master-Master replication&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2956&quot;&gt;&lt;del&gt;SERVER-2956&lt;/del&gt;&lt;/a&gt; and watch it for any updates.&lt;/p&gt;

&lt;p&gt;If you&apos;re familiar with MongoDB internals and have some ideas/suggestions on how to approach the implementation of this feature I&apos;d encourage you to start the discussion in the &lt;a href=&quot;http://groups.google.com/group/mongodb-dev&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-dev user group&lt;/a&gt;, which is for developers of MongoDB.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
                            <comment id="1572192" author="benishak" created="Tue, 16 May 2017 14:00:22 +0000"  >&lt;p&gt;this feature will kill other NoSQL like Cassandra&lt;/p&gt;</comment>
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