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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-20927] 100% CPU on mongo 3.0.4</title>
                <link>https://jira.mongodb.org/browse/SERVER-20927</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hi folks,&lt;/p&gt;

&lt;p&gt;We previously commented on &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19485&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/SERVER-19485&lt;/a&gt; and realise this may be fixed in subsequent versions, but thought it wise to report it nontheless and attach ss.log. I didn&apos;t run it very long as I had to stepDown the server as this is an operating production environment and things were pretty borked during the 100% cpu spike.&lt;/p&gt;

&lt;p&gt;As soon as the stepDown occurred, the CPU dropped back down to normal operating parameters.&lt;/p&gt;</description>
                <environment></environment>
        <key id="234408">SERVER-20927</key>
            <summary>100% CPU on mongo 3.0.4</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="-1">Unassigned</assignee>
                                    <reporter username="mydigitalself">Mike Bartlett</reporter>
                        <labels>
                    </labels>
                <created>Wed, 14 Oct 2015 21:58:20 +0000</created>
                <updated>Sat, 9 Jan 2016 13:23:21 +0000</updated>
                            <resolved>Sat, 9 Jan 2016 13:23:21 +0000</resolved>
                                    <version>3.0.4</version>
                                                    <component>Admin</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1096294" author="ramon.fernandez" created="Mon, 23 Nov 2015 21:28:49 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=mydigitalself&quot; class=&quot;user-hover&quot; rel=&quot;mydigitalself&quot;&gt;mydigitalself&lt;/a&gt;, in the latest date you uploaded I see peaks of over 400K operations per second, and up to 11K connections created per seconds, so it could be that this server is not powerful enough to handle the load it&apos;s being subjected to. In addition, there have been numerous fixes since version 3.0.4, so if this is still an issue for you can you please try MongoDB 3.0.7 and let us know if the issue persists?&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
                            <comment id="1060955" author="mydigitalself" created="Wed, 14 Oct 2015 22:16:23 +0000"  >&lt;p&gt;So it started happening on the new primary a few mins after election, but only very briefly.&lt;/p&gt;

&lt;p&gt;ss-10s.log should capture the 100% cpu&lt;/p&gt;

&lt;p&gt;i then noticed your instructions in the previous bug report for the iostat log and so dropped it down to 1s for the serverStatus and included the iostat.log but it appeared to have dropped down to regular CPU parameters either just before or perhaps during this period.&lt;/p&gt;
</comment>
                            <comment id="1060945" author="mydigitalself" created="Wed, 14 Oct 2015 22:05:51 +0000"  >&lt;p&gt;What I&apos;d really love to know is why the replicaset doesn&apos;t pick this up and re-elect, because clearly the primary is unhealthy in this state.&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="94116" name="iostat.log" size="178554" author="mydigitalself" created="Wed, 14 Oct 2015 22:16:23 +0000"/>
                            <attachment id="94118" name="ss-10s.log" size="150125" author="mydigitalself" created="Wed, 14 Oct 2015 22:16:23 +0000"/>
                            <attachment id="94117" name="ss-1s.log" size="575423" author="mydigitalself" created="Wed, 14 Oct 2015 22:16:23 +0000"/>
                            <attachment id="94107" name="ss.log" size="89261" author="mydigitalself" created="Wed, 14 Oct 2015 21:58:20 +0000"/>
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