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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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    <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-7789] mapReduce on a sharded collection fails with $readPreference </title>
                <link>https://jira.mongodb.org/browse/SERVER-7789</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Running a mapReduce against mongos on a sharded collection with a driver that supports $readPreference produces a server error:&lt;/p&gt;

{ &quot;serverUsed&quot; : &quot;localhost/127.0.0.1:30999&quot; , &quot;ok&quot; : 0.0 , &quot;errmsg&quot; : &quot;unknown m/r field for sharding: $readPreference&quot;}</description>
                <environment></environment>
        <key id="57763">SERVER-7789</key>
            <summary>mapReduce on a sharded collection 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="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="3">Duplicate</resolution>
                                        <assignee username="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="jeff.yemin@mongodb.com">Jeffrey Yemin</reporter>
                        <labels>
                    </labels>
                <created>Wed, 28 Nov 2012 13:33:41 +0000</created>
                <updated>Fri, 15 Feb 2013 15:06:54 +0000</updated>
                            <resolved>Mon, 17 Dec 2012 00:43:00 +0000</resolved>
                                    <version>2.2.2</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="201971" author="zql6625@163.com" created="Thu, 29 Nov 2012 07:29:38 +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>
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                            <customfieldvalue>&lt;p&gt;First, shard the collection that you&apos;re map/reducing over.&lt;br/&gt;
Then, run a command like:&lt;/p&gt;

&lt;p&gt;mongos&amp;gt; db.runCommand( { &quot;mapreduce&quot; : &quot;test&quot;, map : &quot;function() {}&quot;, reduce : &quot;function() {}&quot;, out : &lt;/p&gt;
{inline:1}
&lt;p&gt;, &quot;$readPreference&quot; : &lt;/p&gt;
{ mode : &quot;primary&quot;}
&lt;p&gt; } )&lt;/p&gt;
{ &quot;ok&quot; : 0, &quot;errmsg&quot; : &quot;unknown m/r field for sharding: $readPreference&quot; }</customfieldvalue>

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