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    <title>MongoDB Jira</title>
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    <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-7868] Map/Reduce Does not run on secondaries in a sharded/replica-set configuration</title>
                <link>https://jira.mongodb.org/browse/SERVER-7868</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It appears that Map/Reduce using a readPreference of secondary is not being routed to the secondary servers by the Mongos.&lt;/p&gt;

&lt;p&gt;In the attached mongostat output you can clearly see that the bulk of the commands are being issued to the primary servers instead of the secondaries.&lt;/p&gt;</description>
                <environment>$ uname -a&lt;br/&gt;
Linux pepe 3.6.8-2.fc17.x86_64 #1 SMP Tue Nov 27 19:35:02 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux&lt;br/&gt;
$ more /etc/redhat-release &lt;br/&gt;
Fedora release 17 (Beefy Miracle)&lt;br/&gt;
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        <key id="58609">SERVER-7868</key>
            <summary>Map/Reduce Does not run on secondaries in a sharded/replica-set configuration</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="gianfranco">Gianfranco Palumbo</assignee>
                                    <reporter username="robert.j.moore@allanbank.com">Robert Moore</reporter>
                        <labels>
                    </labels>
                <created>Fri, 7 Dec 2012 02:37:09 +0000</created>
                <updated>Fri, 7 Dec 2012 15:15:30 +0000</updated>
                            <resolved>Fri, 7 Dec 2012 15:14:18 +0000</resolved>
                                    <version>2.2.0</version>
                    <version>2.2.1</version>
                    <version>2.2.2</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="208967" author="gianfranco" created="Fri, 7 Dec 2012 15:15:30 +0000"  >&lt;p&gt;Reproduced and it&apos;s working on 2.3.1&lt;br/&gt;
And to in 2.2.1 as expected.&lt;/p&gt;</comment>
                            <comment id="208835" author="adamc" created="Fri, 7 Dec 2012 11:05:16 +0000"  >&lt;p&gt;Robert,&lt;/p&gt;

&lt;p&gt;As discussed elsewhere, this looks like a dupe of &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&apos;ll test with the snippet provided to confirm.&lt;/p&gt;

&lt;p&gt;Adam&lt;/p&gt;</comment>
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                            <attachment id="22268" name="mongostat_out.txt" size="11006" author="robert.j.moore@allanbank.com" created="Fri, 7 Dec 2012 02:37:09 +0000"/>
                            <attachment id="22267" name="mr_secondaries_test.js" size="875" author="robert.j.moore@allanbank.com" created="Fri, 7 Dec 2012 02:37:09 +0000"/>
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                            <customfieldvalue>&lt;p&gt;Start a cluster with a atleast two replica sets in a sharded configuration.&lt;br/&gt;
Shard a database and collection.&lt;br/&gt;
Start a mongostat to view the commands issued to each server.&lt;br/&gt;
Run the attached script.&lt;/p&gt;</customfieldvalue>

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