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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-27485] mongos 3.2.4 use 100% CPU</title>
                <link>https://jira.mongodb.org/browse/SERVER-27485</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I&apos;m using mongos 3.2.4 on CentOS 6.5.&lt;br/&gt;
Today, mongos use 100% CPU suddenly and calm down.&lt;br/&gt;
mongos log didn&apos;t have any errors.&lt;br/&gt;
I have attached load log.&lt;/p&gt;

&lt;p&gt;Do you have any bug information?&lt;br/&gt;
And what should I do when this problem is occurred again?&lt;/p&gt;</description>
                <environment></environment>
        <key id="340312">SERVER-27485</key>
            <summary>mongos 3.2.4 use 100% CPU</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="5">Cannot Reproduce</resolution>
                                        <assignee username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="akihiro.tatematsu@rakuten.com">Akihiro Tatematsu</reporter>
                        <labels>
                    </labels>
                <created>Wed, 21 Dec 2016 09:43:54 +0000</created>
                <updated>Fri, 17 Feb 2017 20:20:58 +0000</updated>
                            <resolved>Fri, 17 Feb 2017 20:20:58 +0000</resolved>
                                    <version>3.2.4</version>
                                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1502420" author="kaloian.manassiev" created="Fri, 17 Feb 2017 19:08:57 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=akihiro.tatematsu%40rakuten.com&quot; class=&quot;user-hover&quot; rel=&quot;akihiro.tatematsu@rakuten.com&quot;&gt;akihiro.tatematsu@rakuten.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Apologies for the delayed response. Like you observed, there are no errors or warnings in the mongos logs. I also looked at the number of connections established and I don&apos;t see anything abnormal either.&lt;/p&gt;

&lt;p&gt;That being said, in version 3.2.12, which came out this month, we made numerous fixes which make the mongos to mongod communication more efficient. I would recommend that you upgrade to this release and see whether the issue still persists.&lt;/p&gt;

&lt;p&gt;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;Best regards,&lt;br/&gt;
-Kal.&lt;/p&gt;</comment>
                            <comment id="1471193" author="akihiro.tatematsu@rakuten.com" created="Fri, 6 Jan 2017 15:27:46 +0000"  >&lt;p&gt;Hello &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kaloian.manassiev&quot; class=&quot;user-hover&quot; rel=&quot;kaloian.manassiev&quot;&gt;kaloian.manassiev&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=anonymous.user&quot; class=&quot;user-hover&quot; rel=&quot;anonymous.user&quot;&gt;anonymous.user&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;We faced same trouble today.&lt;br/&gt;
I have attached load pics.&lt;br/&gt;
Please check it.&lt;/p&gt;

&lt;p&gt;Thank you,&lt;br/&gt;
Akihiro&lt;/p&gt;</comment>
                            <comment id="1470953" author="akihiro.tatematsu@rakuten.com" created="Fri, 6 Jan 2017 06:38:41 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kaloian.manassiev&quot; class=&quot;user-hover&quot; rel=&quot;kaloian.manassiev&quot;&gt;kaloian.manassiev&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=anonymous.user&quot; class=&quot;user-hover&quot; rel=&quot;anonymous.user&quot;&gt;anonymous.user&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Were you able to open the log of mongos??&lt;br/&gt;
If you checked it already, please share a current status of this ticket.&lt;/p&gt;

&lt;p&gt;Thank you,&lt;br/&gt;
Akihiro&lt;/p&gt;</comment>
                            <comment id="1464984" author="akihiro.tatematsu@rakuten.com" created="Mon, 26 Dec 2016 01:17:03 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=anonymous.user&quot; class=&quot;user-hover&quot; rel=&quot;anonymous.user&quot;&gt;anonymous.user&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for sharing about a secure upload portal site.&lt;br/&gt;
I uploaded the log of mongos that was masked hostname and IP(1st-3rd octet).&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Akihiro&lt;/p&gt;



</comment>
                            <comment id="1464084" author="thomas.schubert" created="Thu, 22 Dec 2016 16:08:17 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=akihiro.tatematsu%40rakuten.com&quot; class=&quot;user-hover&quot; rel=&quot;akihiro.tatematsu@rakuten.com&quot;&gt;akihiro.tatematsu@rakuten.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;I&apos;ve created a secure &lt;a href=&quot;https://10gen-httpsupload.s3.amazonaws.com/upload_forms/0f9637d9-95d4-4f7d-b127-0afcde651070.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;upload portal&lt;/a&gt; for you to use. Files uploaded this portal are only visible to MongoDB employees and are routinely deleted after some time.&lt;/p&gt;

&lt;p&gt;Thank you,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
                            <comment id="1463742" author="akihiro.tatematsu@rakuten.com" created="Thu, 22 Dec 2016 01:54:15 +0000"  >&lt;p&gt;Hi Kaloian Manassiev,&lt;/p&gt;

&lt;p&gt;&amp;gt; Can you please attach the log from mongos and the load from the same time interval from the shards?&lt;br/&gt;
We have 5 shards.&lt;br/&gt;
I have attached the load logs.&lt;/p&gt;

&lt;p&gt;Can I send the log of mongos to your e-mail address for security?&lt;/p&gt;

&lt;p&gt;Thank you,&lt;br/&gt;
 Akihiro&lt;/p&gt;</comment>
                            <comment id="1463601" author="kaloian.manassiev" created="Wed, 21 Dec 2016 22:40:48 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=minsoo.jun%40rakuten.com&quot; class=&quot;user-hover&quot; rel=&quot;minsoo.jun@rakuten.com&quot;&gt;minsoo.jun@rakuten.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Is it possible that the specified mongos simply received increased load for the duration of the time when the problem occurred? Do you have a graph of whether there was increased load on the shards as well?&lt;/p&gt;

&lt;p&gt;The number of established connections increasing might mean that this mongos received many incoming connections which triggered more load. Can you please attach the log from mongos and the load from the same time interval from the shards?&lt;/p&gt;

&lt;p&gt;Best regards,&lt;br/&gt;
-Kal.&lt;/p&gt;

</comment>
                            <comment id="1462925" author="minsoo.jun@rakuten.com" created="Wed, 21 Dec 2016 10:06:02 +0000"  >&lt;p&gt;Additional information.&lt;br/&gt;
We have 2 mongos server. but only 1 mongos server happen problem.&lt;br/&gt;
The disturbing difference is number of &quot;tcp ESTABLISHED&quot;&lt;/p&gt;

&lt;p&gt;Server one: 13387  &amp;lt;- this server have a errors&lt;br/&gt;
Server two: 2588 &lt;/p&gt;
&lt;p/&gt;
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				&lt;p style=&quot;margin: 5px 10px; padding: 0;&quot;&gt;&amp;quot;check command&amp;quot;&lt;/p&gt;
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&lt;p/&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="146632" name="20161222_load.zip" size="401537" author="akihiro.tatematsu@rakuten.com" created="Thu, 22 Dec 2016 01:52:56 +0000"/>
                            <attachment id="146548" name="mongo_load.png" size="9037" author="akihiro.tatematsu@rakuten.com" created="Wed, 21 Dec 2016 09:43:20 +0000"/>
                            <attachment id="147187" name="mongos2.png" size="10703" author="akihiro.tatematsu@rakuten.com" created="Fri, 6 Jan 2017 15:28:04 +0000"/>
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