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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-8219] empty tag sets [{}] asserts with primary read preference</title>
                <link>https://jira.mongodb.org/browse/SERVER-8219</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In jsTests, with a ReplicaSetConnection:&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;
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					&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;conn.setReadPref(&quot;primary&quot;, [{}]);&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;... always results in:&lt;/p&gt;
&lt;p/&gt;
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&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;
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				&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;Thu Jan 17 16:51:38.864 javascript execution failed src/mongo/shell/query.js:78 socket error on query&lt;/span&gt;&lt;/pre&gt;
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						&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;this._cursor = this._mongo.find( this._ns , this._query , this._fields , this.&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;{}&amp;#93;&lt;/span&gt; should be treated the same as null, but apparently it&apos;s treated some other way.&lt;/p&gt;</description>
                <environment></environment>
        <key id="62506">SERVER-8219</key>
            <summary>empty tag sets [{}] asserts with primary read preference</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="9">Done</resolution>
                                        <assignee username="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="jesse@mongodb.com">A. Jesse Jiryu Davis</reporter>
                        <labels>
                    </labels>
                <created>Thu, 17 Jan 2013 21:56:50 +0000</created>
                <updated>Mon, 11 Jul 2016 17:57:38 +0000</updated>
                            <resolved>Fri, 1 Feb 2013 19:14:18 +0000</resolved>
                                                    <fixVersion>2.4.0-rc1</fixVersion>
                                    <component>Internal Client</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="255882" author="auto" created="Fri, 1 Feb 2013 19:13:24 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2013-01-24T16:07:18Z&apos;, u&apos;email&apos;: u&apos;randolph@10gen.com&apos;, u&apos;name&apos;: u&apos;Randolph Tan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-8219&quot; title=&quot;empty tag sets [{}] asserts with primary read preference&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-8219&quot;&gt;&lt;del&gt;SERVER-8219&lt;/del&gt;&lt;/a&gt; empty tag sets &lt;span class=&quot;error&quot;&gt;&amp;#91;{}&amp;#93;&lt;/span&gt; asserts with primary read preference&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cd134b933098e6c777b49bd68365c644d8f63a16&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cd134b933098e6c777b49bd68365c644d8f63a16&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="248016" author="renctan" created="Wed, 23 Jan 2013 21:27:03 +0000"  >&lt;p&gt;Did a quick survey:&lt;/p&gt;

&lt;p&gt;Ruby: allowed&lt;br/&gt;
Python: allowed&lt;br/&gt;
Java: impossible&lt;br/&gt;
Php: allowed&lt;/p&gt;

&lt;p&gt;So I am going to proceed to allow {} tag set for primary.&lt;/p&gt;</comment>
                            <comment id="247978" author="renctan" created="Wed, 23 Jan 2013 20:59:11 +0000"  >&lt;p&gt;The specs says that specifying tags for primary is an error. So, the C++ driver treats it as an error if read preference is primary and the tag field exists. Will check with how the other drivers deal with this to be consistent.&lt;/p&gt;</comment>
                            <comment id="242984" author="jesse" created="Thu, 17 Jan 2013 22:00:08 +0000"  >&lt;p&gt;My local current version of read_pref_cmd.js&lt;/p&gt;</comment>
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