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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-10677] Execute aggregation framework on secondary node</title>
                <link>https://jira.mongodb.org/browse/SERVER-10677</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hello.&lt;/p&gt;

&lt;p&gt;In C++ i tried execute aggregation framework like in example with readPreference :&lt;/p&gt;

&lt;p&gt;conn-&amp;gt;runCommand( &quot;goods&quot;, BSON( &quot;aggregate&quot; &amp;lt;&amp;lt; &quot;events&quot; &amp;lt;&amp;lt; &quot;pipeline&quot; &amp;lt;&amp;lt; pipeline&amp;lt;&amp;lt;&quot;$readPreference&quot;&amp;lt;&amp;lt;BSON(&quot;mode&quot;&amp;lt;&amp;lt;&quot;secondaryPreferred&quot;)), res);&lt;/p&gt;


&lt;p&gt;Client connected to monogos with one single shard with four nodes in replicaset. Command always execute on primary node. &lt;/p&gt;

&lt;p&gt;I dont understand, how execute framework on secondary node.&lt;br/&gt;
Is it possible?&lt;/p&gt;


&lt;p&gt;Thank you.&lt;/p&gt;

</description>
                <environment>Linux Ubuntu 12.04 single shard server with 4 nodes in one replicaset 2.4.6</environment>
        <key id="88467">SERVER-10677</key>
            <summary>Execute aggregation framework on secondary node</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="esp1974">Dmitry</reporter>
                        <labels>
                            <label>aggregate</label>
                            <label>c++</label>
                            <label>mongod</label>
                            <label>mongos</label>
                    </labels>
                <created>Wed, 4 Sep 2013 14:28:43 +0000</created>
                <updated>Wed, 10 Dec 2014 23:11:13 +0000</updated>
                            <resolved>Mon, 9 Sep 2013 02:37:43 +0000</resolved>
                                    <version>2.4.6</version>
                                                    <component>Aggregation Framework</component>
                    <component>Internal Client</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="418310" author="esp1974" created="Thu, 5 Sep 2013 06:38:46 +0000"  >&lt;p&gt;Thank you. Works for me.&lt;/p&gt;

&lt;p&gt;If add to cmdCommand $queryOptions: { $readPreference: &lt;/p&gt;
{ mode: &quot;secondaryPreferred&quot; }
&lt;p&gt; } }  works too.&lt;/p&gt;</comment>
                            <comment id="417659" author="renctan" created="Wed, 4 Sep 2013 14:52:02 +0000"  >&lt;p&gt;Hi,&lt;/p&gt;

&lt;p&gt;Currently, there is no helper method for the C++ driver for setting read preference for commands. As a work around, can you try doing this instead?&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Query cmd(BSON(&quot;aggregate&quot; &amp;lt;&amp;lt; &quot;events&quot; &amp;lt;&amp;lt; &quot;pipeline&quot; &amp;lt;&amp;lt; pipeline));&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;cmd.readPref(mongo::ReadPreference_SecondaryPreferred, BSONArray());&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;BSONObj result = conn-&amp;gt;findOne(&quot;goods.$cmd&quot;, cmd);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
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&lt;p/&gt;</comment>
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