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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-26660] MongoDB WT replication network usage</title>
                <link>https://jira.mongodb.org/browse/SERVER-26660</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I have a mongo replica set where all reads/writes must go via the primary. The majority of the writes to the primary are small UPDATES to relatively large documents (~500kB). Each document may have between 5 and 10 updates one after the other.&lt;/p&gt;

&lt;p&gt;Recently I noticed something odd, in that the network IN to the secondaries is MUCH higher than the network IN to the primary. Given that the secondaries should only be handling replication and nothing else I&apos;m at a bit of a loss to explain this effect.&lt;/p&gt;

&lt;p&gt;Here is the network IN over the last hour to the PRIMARY: &lt;br/&gt;
&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/141661/141661_1.png&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;And here is the network IN over the last hour for the two SECONDARIES: &lt;br/&gt;
&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/141660/141660_2.png&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;br/&gt;
&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/141659/141659_3.png&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;The network IN on the secondaries appears to average about 200MB (per minute), which is 3 times higher than the 60MB (per minute) of the primary. &lt;/p&gt;

&lt;p&gt;What could explain this?&lt;/p&gt;</description>
                <environment>EC2 Sharded Replicaset</environment>
        <key id="324213">SERVER-26660</key>
            <summary>MongoDB WT replication network usage</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="-1">Unassigned</assignee>
                                    <reporter username="MarcF">Marc Fletcher</reporter>
                        <labels>
                    </labels>
                <created>Mon, 17 Oct 2016 16:45:20 +0000</created>
                <updated>Thu, 20 Oct 2016 08:35:39 +0000</updated>
                            <resolved>Mon, 17 Oct 2016 21:14:25 +0000</resolved>
                                    <version>3.0.12</version>
                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1413444" author="marcf" created="Thu, 20 Oct 2016 08:35:39 +0000"  >&lt;p&gt;Hi @ramon.fernandez, &lt;/p&gt;

&lt;p&gt;Thanks for the reply, but I do believe this might be a bug with MongoDB server, or WT (which is the project I originally reported this issue in). &lt;/p&gt;

&lt;p&gt;I did post this issue to Stack Overflow, and waited almost 1 month for a response (&lt;a href=&quot;http://stackoverflow.com/questions/39613389/mongodb-replication-network-usage&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://stackoverflow.com/questions/39613389/mongodb-replication-network-usage&lt;/a&gt;). The lack of response on SO is what made me believe it&apos;s &apos;unexpected&apos; behavior. I&apos;ve since also posted on the mongodb-user group as you suggested (also no response there).&lt;/p&gt;

&lt;p&gt;If you happen to know that this is NOT a bug a quick acknowledgment of that, alongside a potential solution to ensuring the network IN usage of both primary and secondaries are equivalent that would be greatly appreciated.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Marc&lt;/p&gt;</comment>
                            <comment id="1410917" author="ramon.fernandez" created="Mon, 17 Oct 2016 21:14:15 +0000"  >&lt;p&gt;Thanks for your report &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=MarcF&quot; class=&quot;user-hover&quot; rel=&quot;MarcF&quot;&gt;MarcF&lt;/a&gt;. Please note that the SERVER project is for reporting bugs or feature suggestions for 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;, where your question will reach a larger audience. A question like this involving more discussion would be best posted 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;. See also our &lt;a href=&quot;https://www.mongodb.org/about/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;Regards,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
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                            <attachment id="141661" name="1.png" size="57312" author="MarcF" created="Mon, 17 Oct 2016 16:45:20 +0000"/>
                            <attachment id="141660" name="2.png" size="51246" author="MarcF" created="Mon, 17 Oct 2016 16:45:20 +0000"/>
                            <attachment id="141659" name="3.png" size="52990" author="MarcF" created="Mon, 17 Oct 2016 16:45:20 +0000"/>
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