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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>
    </build-info>


<item>
            <title>[SERVER-22289] Mongo.setReadPref(&#8220;secondary&#8221;) doesn&apos;t work when connected to primary node</title>
                <link>https://jira.mongodb.org/browse/SERVER-22289</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I&apos;m not sure if I got this wrong, but I expect Mongo.setReadPref(&quot;secondary&quot;) to force reads to get redirected to the secondary nodes of a replica set. If I&apos;m connected to the master of the set via mongo-shell, the shell should know about primary/secondary nodes. Problem is that if I query something (which is of course a read) the master handles my query, which is not what I want it to do (because I do some reporting stuff).&lt;/p&gt;

&lt;p&gt;I also tried to set the readPref for single find(...) calls (with db.collection.find(&lt;/p&gt;
{email: &quot;example@mail.com&quot;}
&lt;p&gt;).readPref(&quot;secondary&quot;)), which didn&apos;t work neither.&lt;/p&gt;

&lt;p&gt;If I connect to the secondary right away (when starting the mongo shell), this works as expected. The problem still exists, since I don&apos;t want to care to which server I connect (in case of primary/secondary node changes). Mongo drivers in python e.g. do support this.&lt;/p&gt;</description>
                <environment></environment>
        <key id="260556">SERVER-22289</key>
            <summary>Mongo.setReadPref(&#8220;secondary&#8221;) doesn&apos;t work when connected to primary node</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="5">Cannot Reproduce</resolution>
                                        <assignee username="kelsey.schubert@mongodb.com">Kelsey Schubert</assignee>
                                    <reporter username="robsi">Robert Aistleitner</reporter>
                        <labels>
                    </labels>
                <created>Mon, 25 Jan 2016 13:03:19 +0000</created>
                <updated>Fri, 29 Jan 2016 23:26:56 +0000</updated>
                            <resolved>Mon, 25 Jan 2016 19:01:40 +0000</resolved>
                                    <version>3.0.8</version>
                    <version>3.2.1</version>
                                                    <component>Shell</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1158605" author="thomas.schubert" created="Fri, 29 Jan 2016 23:26:56 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=robsi&quot; class=&quot;user-hover&quot; rel=&quot;robsi&quot;&gt;robsi&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;I wanted to correct my previous comment and provide some additional information. The mongo shell respects read preference, but you need to use a replica set connection instead of a direct connection&lt;/p&gt;

&lt;p&gt;I suggest you use the following command which creates a replica set connection:&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;   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;mongo --host replsetname/seedhost:port script.js&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;where the script sets the readPref to secondary.&lt;/p&gt;

&lt;p&gt;Additionally, as of 3.2.0, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6233&quot; title=&quot;Support MongoDB URIs as mongo shell argument&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6233&quot;&gt;&lt;del&gt;SERVER-6233&lt;/del&gt;&lt;/a&gt; means you may also use the &lt;a href=&quot;https://docs.mongodb.org/manual/reference/connection-string/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;modern URI style connection string&lt;/a&gt;:&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;   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;mongo mongodb://seedhost1:port,seedhost2:port,.../dbname?replicaSet=replsetname&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;I believe that the first command should fulfill your needs. It is possible that during failover the read pref of &quot;secondary&quot; may be directed to the new primary if the connection if the connection was established while it was a secondary.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
                            <comment id="1152983" author="thomas.schubert" created="Mon, 25 Jan 2016 19:01:41 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=robsi&quot; class=&quot;user-hover&quot; rel=&quot;robsi&quot;&gt;robsi&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;I connected to the replicaset using &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;   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;mongo --host host1:27017&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;When this parameter is used the mongo shell will connect to the primary and if a step down occurs it will reconnect to the new primary after an election occurs.&lt;/p&gt;

&lt;p&gt;I executed &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;   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;db.getMongo().setReadPref(&quot;secondary&quot;)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;and observed that the queries were being sent to the secondaries.&lt;/p&gt;

&lt;p&gt;If you follow these steps and the issue persists please comment and we will reopen this ticket.&lt;/p&gt;

&lt;p&gt;Thank you,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
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