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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-32874] Map Reduce Sharded; true- It just writes to one shard</title>
                <link>https://jira.mongodb.org/browse/SERVER-32874</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I am trying to make a map reduce with sharded option true.&lt;br/&gt;
The output collection does not exist before the mapreduce.&lt;/p&gt;

&lt;p&gt;I have 8 shards, however when I run the map reduce:&lt;br/&gt;
with the output options:&lt;br/&gt;
    out: &lt;/p&gt;
{ &quot;reduce&quot; : &quot;testCollection&quot; , &quot;sharded&quot; : true , &quot;nonAtomic&quot; : false}
&lt;p&gt;,&lt;/p&gt;

&lt;p&gt;It is writing just to one shard, instead of balancing through the 8 shards.&lt;/p&gt;

&lt;p&gt;Totals&lt;br/&gt;
 data : 1.03GiB docs : 2768955 chunks : 16&lt;br/&gt;
 Shard shard0000 contains 0% data, 0% docs in cluster, avg obj size on shard : NaNGiB&lt;br/&gt;
 Shard shard0001 contains 0% data, 0% docs in cluster, avg obj size on shard : NaNGiB&lt;br/&gt;
 Shard shard0002 contains 0% data, 0% docs in cluster, avg obj size on shard : NaNGiB&lt;br/&gt;
 Shard shard0003 contains 0% data, 0% docs in cluster, avg obj size on shard : NaNGiB&lt;br/&gt;
 Shard shard0004 contains 0% data, 0% docs in cluster, avg obj size on shard : NaNGiB&lt;br/&gt;
 Shard shard0005 contains 0% data, 0% docs in cluster, avg obj size on shard : NaNGiB&lt;br/&gt;
 Shard shard0006 contains 100% data, 100% docs in cluster, avg obj size on shard : 400B&lt;br/&gt;
 Shard shard0007 contains 0% data, 0% docs in cluster, avg obj size on shard : NaNGiB&lt;/p&gt;</description>
                <environment></environment>
        <key id="486822">SERVER-32874</key>
            <summary>Map Reduce Sharded; true- It just writes to one shard</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="4">Incomplete</resolution>
                                        <assignee username="mark.agarunov">Mark Agarunov</assignee>
                                    <reporter username="rribeiro">Rui Ribeiro</reporter>
                        <labels>
                    </labels>
                <created>Wed, 24 Jan 2018 16:45:27 +0000</created>
                <updated>Wed, 21 Mar 2018 04:32:52 +0000</updated>
                            <resolved>Fri, 16 Feb 2018 22:40:54 +0000</resolved>
                                    <version>3.0 Required</version>
                                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1808621" author="thomas.schubert" created="Fri, 16 Feb 2018 22:40:54 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=rribeiro&quot; class=&quot;user-hover&quot; rel=&quot;rribeiro&quot;&gt;rribeiro&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;We haven&#8217;t heard back from you for some time, so I&#8217;m going to mark this ticket as resolved. If this is still an issue for you, please provide additional information and we will reopen the ticket.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Kelsey&lt;/p&gt;</comment>
                            <comment id="1784170" author="mark.agarunov" created="Wed, 24 Jan 2018 22:21:22 +0000"  >&lt;p&gt;Hello &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=rribeiro&quot; class=&quot;user-hover&quot; rel=&quot;rribeiro&quot;&gt;rribeiro&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for the report. To get a better idea of why the you are only seeing data written to one shard, could you please provide the output of &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;sh.status({verbose:true})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt; as well as the complete log files from the affected &lt;tt&gt;mongod&lt;/tt&gt; and &lt;tt&gt;mongos&lt;/tt&gt; nodes? This should give some insight into this behavior.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Mark&lt;/p&gt;</comment>
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