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    <title>MongoDB Jira</title>
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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-31123] Primary node of ReplicaSet constantly high cpu usage</title>
                <link>https://jira.mongodb.org/browse/SERVER-31123</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hi,&lt;br/&gt;
We use mongo replicaSet version 3.4.2 on our production environments. The replicaSet works with 6 nodes , one primary and 5 secondaries. Few weeks ago we have started to get alerts on high cpu consumption on the primary node. At the beginning we thought that we should separate the load between the members so we configured our service to make reads from secondaries and write to the primary.&lt;/p&gt;

&lt;p&gt;Unfortunately we are still on the same point. The cpu of the primary node is between 70-100% even on idle times while the secondaries consumes maximum of 20%.&lt;/p&gt;

&lt;p&gt;It is important to mention that we creates DB for each one of our customers with average of 9 indexes each - we have 1500DB&apos;s like that.&lt;/p&gt;

&lt;p&gt;Attached a log of db.currentOp() , mongostat and diagnostic metrics. let me know if more information required.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Roie.&lt;/p&gt;</description>
                <environment></environment>
        <key id="428679">SERVER-31123</key>
            <summary>Primary node of ReplicaSet constantly high cpu usage</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="kelsey.schubert@mongodb.com">Kelsey Schubert</assignee>
                                    <reporter username="roiey">Roie Yossef</reporter>
                        <labels>
                    </labels>
                <created>Mon, 18 Sep 2017 08:17:32 +0000</created>
                <updated>Mon, 9 Oct 2017 17:01:38 +0000</updated>
                            <resolved>Mon, 18 Sep 2017 14:57:36 +0000</resolved>
                                    <version>3.4.2</version>
                                                    <component>Performance</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1675421" author="thomas.schubert" created="Mon, 18 Sep 2017 14:57:36 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=roiey&quot; class=&quot;user-hover&quot; rel=&quot;roiey&quot;&gt;roiey&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thanks for the report. From the provided diagnostic data, I do not see anything to indicate a bug in the MongoDB server. For MongoDB-related support discussion please post on the &lt;a href=&quot;http://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user group&lt;/a&gt; or &lt;a href=&quot;http://stackoverflow.com/questions/tagged/mongodb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Stack Overflow with the &lt;tt&gt;mongodb&lt;/tt&gt; tag&lt;/a&gt;. A question like this involving more discussion would be best posted on the mongodb-users group.&lt;/p&gt;

&lt;p&gt;See also our &lt;a href=&quot;https://docs.mongodb.org/manual/support&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Technical Support page&lt;/a&gt; for additional support resources.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Kelsey&lt;/p&gt;</comment>
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                    <attachments>
                            <attachment id="165705" name="metrics.2017-09-17T20-02-23Z-00000" size="10427529" author="roiey" created="Mon, 18 Sep 2017 08:15:00 +0000"/>
                            <attachment id="165706" name="mongo.currentOp" size="6171" author="roiey" created="Mon, 18 Sep 2017 08:14:48 +0000"/>
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