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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-7768] aggregate command fails with $readPreference</title>
                <link>https://jira.mongodb.org/browse/SERVER-7768</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Note: this seems to only be a problem with the aggregate command. In 2.2.x all other commands seem to ignore $readPreference (support is implemented in 2.3.1 for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7423&quot; title=&quot;Support commands for read preference&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7423&quot;&gt;&lt;del&gt;SERVER-7423&lt;/del&gt;&lt;/a&gt;)&lt;/p&gt;

&lt;p&gt;This effects at least the Java and Python drivers, which always send $readPreference to mongos for certain white listed commands.&lt;/p&gt;

&lt;p&gt;aggregate without $readPreference, no issues:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;mongos&amp;gt; db.runCommand({&apos;aggregate&apos;: &apos;test&apos;, &apos;pipeline&apos;: [{&apos;$project&apos;: {&apos;_id&apos;: false, &apos;foo&apos;: true}}]})&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;{ &quot;result&quot; : [ { }, { &quot;foo&quot; : &quot;bar&quot; } ], &quot;ok&quot; : 1 }&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;aggregate with $readPreference, errors:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;mongos&amp;gt; db.runCommand({&apos;aggregate&apos;: &apos;test&apos;, &apos;pipeline&apos;: [{&apos;$project&apos;: {&apos;_id&apos;: false, &apos;foo&apos;: true}}], $readPreference: {&apos;mode&apos;: &apos;primary&apos;}})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{ &quot;ok&quot; : 0, &quot;errmsg&quot; : &quot;unrecognized field \&quot;$readPreference&quot; }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;count (as one counter-example) with $readPreference, no issues:&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;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;mongos&amp;gt; db.runCommand({&apos;count&apos;: &apos;test&apos;, query: {}, $readPreference: {&apos;mode&apos;: &apos;primary&apos;}})&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;{ &quot;shards&quot; : { &quot;shard0000&quot; : 2 }, &quot;n&quot; : 2, &quot;ok&quot; : 1 }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</description>
                <environment></environment>
        <key id="57547">SERVER-7768</key>
            <summary>aggregate command fails with $readPreference</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="bernie@mongodb.com">Bernie Hackett</reporter>
                        <labels>
                    </labels>
                <created>Tue, 27 Nov 2012 00:48:21 +0000</created>
                <updated>Tue, 26 Sep 2017 13:29:39 +0000</updated>
                            <resolved>Tue, 11 Dec 2012 02:48:11 +0000</resolved>
                                    <version>2.2.0</version>
                    <version>2.2.1</version>
                                    <fixVersion>2.3.2</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="201970" author="zql6625@163.com" created="Thu, 29 Nov 2012 07:29:01 +0000"  >&lt;p&gt;i got this problem too after i run m/r with 2.10.0 version of java driver. so changed the java driver to 2.9.1. now it works ok.&lt;/p&gt;</comment>
                            <comment id="201653" author="auto" created="Wed, 28 Nov 2012 22:48:51 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-11-27T16:51:07Z&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7768&quot; title=&quot;aggregate command fails with $readPreference&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7768&quot;&gt;&lt;del&gt;SERVER-7768&lt;/del&gt;&lt;/a&gt; aggregate command should ignore options that start with $&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1aa1cd5d0b6e5d02d6aa0871a3fbc735e9e14ee5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1aa1cd5d0b6e5d02d6aa0871a3fbc735e9e14ee5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="199731" author="behackett" created="Tue, 27 Nov 2012 03:21:01 +0000"  >&lt;p&gt;This should already be fixed in 2.3.1 (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7423&quot; title=&quot;Support commands for read preference&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7423&quot;&gt;&lt;del&gt;SERVER-7423&lt;/del&gt;&lt;/a&gt;). We need a fix in 2.2.2. There isn&apos;t any good way to work around this in the drivers.&lt;/p&gt;</comment>
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