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    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-9480] primary shard gets most of the queries</title>
                <link>https://jira.mongodb.org/browse/SERVER-9480</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;does anyone know why the primary shard gets most (95%) of the queries?&lt;/p&gt;

&lt;p&gt;mongostat shows that the primary mongod of the primary shard gets 400 qps and the primary mongod of the other shard gets only around 20 qps&lt;/p&gt;

&lt;p&gt;shard key is &lt;/p&gt;
{ _id: &apos;hashed&apos; }
&lt;p&gt; and queries do not use the shard key, but data should be uniformly balanced on both shards&lt;br/&gt;
current chunk ratio between these 2 shards is 703 : 704&lt;/p&gt;

&lt;p&gt;this is a test environment, so nothing else is running on these servers&lt;/p&gt;

&lt;p&gt;if i &quot;movePrimary&quot; to another shard, then that&apos;s the one that will get most of the queries..&lt;/p&gt;</description>
                <environment></environment>
        <key id="73211">SERVER-9480</key>
            <summary>primary shard gets most of the queries</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="-1">Unassigned</assignee>
                                    <reporter username="pcmaniac">Nemanja Dubravac</reporter>
                        <labels>
                            <label>mongostat</label>
                            <label>query</label>
                            <label>sharding</label>
                    </labels>
                <created>Fri, 26 Apr 2013 09:20:10 +0000</created>
                <updated>Wed, 10 Dec 2014 23:11:33 +0000</updated>
                            <resolved>Thu, 2 May 2013 05:20:21 +0000</resolved>
                                    <version>2.4.2</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="326314" author="jantje.daniel" created="Thu, 2 May 2013 05:20:21 +0000"  >&lt;p&gt;Hi Nemanja,&lt;/p&gt;

&lt;p&gt;Thanks for the update. Resolving now.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Ian&lt;/p&gt;</comment>
                            <comment id="325547" author="pcmaniac" created="Wed, 1 May 2013 09:51:24 +0000"  >&lt;p&gt;we should close this ticket, as it&apos;s totally wrong..&lt;br/&gt;
i completely oversaw some other queries from an included class being made on non-sharded collections&lt;/p&gt;

&lt;p&gt;sorry for the waste of anyone&apos;s time.. &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/smile.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;</comment>
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