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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[DOCS-774] Documentation doesn&apos;t cover how to set up &quot;hidden&quot; nodes using a sharded cluster.</title>
                <link>https://jira.mongodb.org/browse/DOCS-774</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;Hidden members don&apos;t work well with a sharded cluster. The normal use case is for a single replica set. In that case, you can directly connect to the single hidden node and send your read-only testing queries there.&lt;/p&gt;

&lt;p&gt;However, you cannot query a sharded collection and have it target the hidden nodes. Because those nodes are marked as &apos;hidden&apos;, there is no way to have the &apos;mongos&apos; direct queries to those nodes.&lt;/p&gt;

&lt;p&gt;The way to implement &quot;hidden&quot; nodes in a sharded cluster is to use  the new tag-aware sharding features. In your three-node replica set, you&apos;d tag one node as &apos;testing&apos;, and set it to priority 0, so it could never become master. You&apos;d then tag the other two nodes as &apos;working&apos;.&lt;/p&gt;

&lt;p&gt;You would then have to set a read preference in your application: the production applications would set a read preference of &apos;working&apos;, and the testing/analytics application would set a read preference of &apos;testing&apos;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="56938">DOCS-774</key>
            <summary>Documentation doesn&apos;t cover how to set up &quot;hidden&quot; nodes using a sharded cluster.</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="william.zola@10gen.com">William Zola</reporter>
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                <created>Mon, 19 Nov 2012 18:39:51 +0000</created>
                <updated>Mon, 19 Nov 2012 19:43:10 +0000</updated>
                            <resolved>Mon, 19 Nov 2012 19:43:10 +0000</resolved>
                                                                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="194034" author="samk" created="Mon, 19 Nov 2012 19:41:34 +0000"  >&lt;p&gt;dupe. Will link and close.&lt;/p&gt;</comment>
                            <comment id="194013" author="scotthernandez" created="Mon, 19 Nov 2012 19:19:43 +0000"  >&lt;p&gt;We should not come at this from the hidden perspective but about creating different groups of replicas for different work-loads. I think this also a dup, but I haven&apos;t searched for it yet.&lt;/p&gt;</comment>
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            <issuekey id="42793">DOCS-305</issuekey>
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