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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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    <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-44187] High I/O load in Secondary node</title>
                <link>https://jira.mongodb.org/browse/SERVER-44187</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In the scenario of continuous insertion and update, the role of mongodb is changed on the same host, and iostat is used to monitor the performance of io. It is found that the value of %util is much lower than that of seconary while in role primary.&lt;/p&gt;</description>
                <environment></environment>
        <key id="977968">SERVER-44187</key>
            <summary>High I/O load in Secondary node</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="13202">Works as Designed</resolution>
                                        <assignee username="dmitry.agranat@mongodb.com">Dmitry Agranat</assignee>
                                    <reporter username="879811746@qq.com">miao yimin</reporter>
                        <labels>
                    </labels>
                <created>Thu, 24 Oct 2019 03:37:19 +0000</created>
                <updated>Fri, 27 Oct 2023 13:53:01 +0000</updated>
                            <resolved>Mon, 11 Nov 2019 09:55:34 +0000</resolved>
                                    <version>3.2.10</version>
                                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="2498806" author="dmitry.agranat" created="Thu, 24 Oct 2019 10:05:08 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=879811746%40qq.com&quot; class=&quot;user-hover&quot; rel=&quot;879811746@qq.com&quot;&gt;879811746@qq.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;In general, uneven i/o during the write workload between the Primary and Secondaries can be attributed to different reasons, for example, due to the way we are flushing on every replication batch to ensure durability of each batch. &lt;/p&gt;

&lt;p&gt;We&apos;d be happy to have a closer look once your cluster is running on one of our latest MongoDB versions (as of today &lt;a href=&quot;https://docs.mongodb.com/manual/release-notes/4.2/#oct-18-2019&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;MongoDB 4.2.1&lt;/a&gt; ) as MongoDB 3.2 has reached EOL on September 2018.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Dima&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="235178" name="primary iops.jpg" size="203805" author="879811746@qq.com" created="Thu, 24 Oct 2019 06:27:19 +0000"/>
                            <attachment id="235179" name="primary mongostat.jpg" size="260438" author="879811746@qq.com" created="Thu, 24 Oct 2019 06:27:23 +0000"/>
                            <attachment id="235180" name="secondary iops.jpg" size="161122" author="879811746@qq.com" created="Thu, 24 Oct 2019 06:27:28 +0000"/>
                            <attachment id="235181" name="secondary mongostat.jpg" size="256435" author="879811746@qq.com" created="Thu, 24 Oct 2019 06:27:31 +0000"/>
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&lt;p&gt;&#65288;2&#65289;Watch the primary iops&lt;/p&gt;

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Observing the main iops situation&lt;/p&gt;</customfieldvalue>

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