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    <title>MongoDB Jira</title>
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    <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-1628] Excessive CPU usage by available replicaset nodes when one node is down</title>
                <link>https://jira.mongodb.org/browse/SERVER-1628</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In a replicaset of 3 idle nodes, when one node is unavailable, the remaining two nodes&apos; processes spike to about 60%-80% CPU usage. The spikes seem to occur in an alternating fashion once a second.&lt;/p&gt;

&lt;p&gt;Bringing the missing node back online results in all nodes&apos; processes returning to a consistent &amp;lt;1% cpu usage.&lt;/p&gt;

&lt;p&gt;The attached graph shows the processes spiking on CPU #2 (right most graph) and then returning to normal at the end when the 3rd node is brought back online.&lt;/p&gt;</description>
                <environment>Windows 7 64bit</environment>
        <key id="12783">SERVER-1628</key>
            <summary>Excessive CPU usage by available replicaset nodes when one node is down</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="9">Done</resolution>
                                        <assignee username="dwight@mongodb.com">Dwight Merriman</assignee>
                                    <reporter username="andrewk">AndrewK</reporter>
                        <labels>
                    </labels>
                <created>Fri, 13 Aug 2010 08:43:20 +0000</created>
                <updated>Tue, 12 Jul 2016 00:17:01 +0000</updated>
                            <resolved>Sat, 14 Aug 2010 02:08:03 +0000</resolved>
                                    <version>1.6.0</version>
                                    <fixVersion>1.6.1</fixVersion>
                    <fixVersion>1.7.0</fixVersion>
                                    <component>Performance</component>
                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="16954" author="auto" created="Mon, 16 Aug 2010 21:10:04 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;login&apos;: &apos;erh&apos;, &apos;name&apos;: &apos;Eliot Horowitz&apos;, &apos;email&apos;: &apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: BackgroundJob::wait bug &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1628&quot; title=&quot;Excessive CPU usage by available replicaset nodes when one node is down&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1628&quot;&gt;&lt;del&gt;SERVER-1628&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Conflicts:&lt;/p&gt;

&lt;p&gt;	util/background.cpp&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/67159d2583670da3b299a29d6e96e1afd119d31e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/67159d2583670da3b299a29d6e96e1afd119d31e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="16872" author="dwight_10gen" created="Fri, 13 Aug 2010 19:40:34 +0000"  >&lt;p&gt;1.6.1?&lt;/p&gt;</comment>
                            <comment id="16870" author="auto" created="Fri, 13 Aug 2010 19:36:22 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;login&apos;: &apos;dwight&apos;, &apos;name&apos;: &apos;dwight&apos;, &apos;email&apos;: &apos;dwight@10gen.com&apos;}
&lt;p&gt;Message: BackgroundJob::wait bug &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1628&quot; title=&quot;Excessive CPU usage by available replicaset nodes when one node is down&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1628&quot;&gt;&lt;del&gt;SERVER-1628&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/1bf648b529e51dea9f686745e66038b674d11a1b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/1bf648b529e51dea9f686745e66038b674d11a1b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="16869" author="auto" created="Fri, 13 Aug 2010 18:47:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;login&apos;: &apos;dwight&apos;, &apos;name&apos;: &apos;dwight&apos;, &apos;email&apos;: &apos;dwight@10gen.com&apos;}
&lt;p&gt;Message: make BackgroundJob less goofy in its implementation. towards &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1628&quot; title=&quot;Excessive CPU usage by available replicaset nodes when one node is down&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1628&quot;&gt;&lt;del&gt;SERVER-1628&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/38cf4f81f1fe36a2fb5ab839d6114989130abe0b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/38cf4f81f1fe36a2fb5ab839d6114989130abe0b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="16866" author="dwight_10gen" created="Fri, 13 Aug 2010 18:11:17 +0000"  >&lt;p&gt;reproduced.&lt;br/&gt;
looking into it&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="10372" name="excessivecpu.png" size="8831" author="andrewk" created="Fri, 13 Aug 2010 08:43:20 +0000"/>
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