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            <title>[SERVER-14698] Maintaining mirror database of replset on a single MongoDB instance</title>
                <link>https://jira.mongodb.org/browse/SERVER-14698</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hello,&lt;/p&gt;

&lt;p&gt;We are running production replset and also need a mirror DB of it. This mirror DB is on a single MongoDB instance, not a replset. Please check attachment for the layout.&lt;/p&gt;

&lt;p&gt;We would like to know if there is a best practice for this use case?&lt;/p&gt;

&lt;p&gt;Thank you very much,&lt;br/&gt;
Tung&lt;/p&gt;</description>
                <environment></environment>
        <key id="149298">SERVER-14698</key>
            <summary>Maintaining mirror database of replset on a single MongoDB instance</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="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="tung@misfitwearables.com">Tung Nguyen</reporter>
                        <labels>
                    </labels>
                <created>Sat, 26 Jul 2014 14:34:48 +0000</created>
                <updated>Wed, 10 Dec 2014 23:19:01 +0000</updated>
                            <resolved>Mon, 28 Jul 2014 14:18:12 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="674476" author="tung@misfitwearables.com" created="Tue, 29 Jul 2014 04:00:10 +0000"  >&lt;p&gt;Thanks Ramon.&lt;/p&gt;</comment>
                            <comment id="673529" author="ramon.fernandez" created="Mon, 28 Jul 2014 14:17:24 +0000"  >&lt;p&gt;Thanks for your report. The SERVER project is for reporting bugs or feature suggestions for the MongoDB server and tools. For MongoDB-related support discussion please post on the &lt;a href=&quot;http://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user group&lt;/a&gt; or &lt;a href=&quot;http://stackoverflow.com/questions/tagged/mongodb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Stack Overflow with the &lt;tt&gt;mongodb&lt;/tt&gt; tag&lt;/a&gt;. A question like this involving more discussion would be best posted on the mongodb-user group.&lt;/p&gt;</comment>
                            <comment id="672332" author="tung@misfitwearables.com" created="Sat, 26 Jul 2014 14:48:47 +0000"  >&lt;p&gt;More information, we tried running mongooplog on the mirror DB, mirroring the hidden member but it got timed out all the time.&lt;/p&gt;

&lt;p&gt;Then we added another hidden instance to the replset (it is not drawn out in the attachment), which was a powerful machine so we could touch oplog into its memory. And we could run mongooplog successfully. But he problem is, we do not want the hidden member to be that powerful, we need to keep it as small as the original hidden (in the attachment).&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Tung&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="48623" name="mirroring-db.png" size="30118" author="tung@misfitwearables.com" created="Sat, 26 Jul 2014 14:34:48 +0000"/>
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