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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-67068] Entries in oplog of admin.$cmd increase in size</title>
                <link>https://jira.mongodb.org/browse/SERVER-67068</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;At some point in time on one of our shards the entries of the collection admin.$cmd got bigger, because of which the oplog size began lowering. We didn&apos;t notice that the amount of entries had any increase, only the size.&lt;br/&gt;
I guess that somehow was related to using transaction since the entries were for the collections we&apos;re using transaction for.&lt;br/&gt;
That kept happening until we changed the primary replica on that shard. Right after that the oplog went back to normal.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Our cluster configuration:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;shard cluster with 10 shards&lt;/li&gt;
	&lt;li&gt;four replicas in each shard&lt;/li&gt;
	&lt;li&gt;about 400 GB of data in storage size per shard&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Replica server configuration:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Ubuntu 16.04&lt;/li&gt;
	&lt;li&gt;XSF&lt;/li&gt;
	&lt;li&gt;Kernel - 4.4.0-1128-aws #142-Ubuntu SMP Fri Apr 16 12:42:33 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux&lt;/li&gt;
	&lt;li&gt;Disable Transparent Huge disabled&lt;/li&gt;
	&lt;li&gt;AWS m5.xlarge (4cpu\16gb)&lt;/li&gt;
	&lt;li&gt;SSD GP3 450 Gb&lt;/li&gt;
	&lt;li&gt;monogo-org-server - 4.2.17&lt;/li&gt;
&lt;/ul&gt;



&lt;p&gt;I&apos;m attaching diagnostic.data from the primary where the incident happened.&lt;/p&gt;

&lt;p&gt;Incident time:&lt;br/&gt;
beginning - 03.06.2022 08:30:00 UTC&lt;br/&gt;
end - 03.06.2022 15:45:00 UTC&lt;/p&gt;</description>
                <environment>Ubuntu 16.04&lt;br/&gt;
XSF&lt;br/&gt;
Kernel - 4.4.0-1128-aws #142-Ubuntu SMP Fri Apr 16 12:42:33 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux&lt;br/&gt;
Disable Transparent Huge disabled&lt;br/&gt;
AWS m5.xlarge (4cpu\16gb)&lt;br/&gt;
SSD GP3 450 Gb&lt;br/&gt;
monogo-org-server - 4.2.17</environment>
        <key id="2063388">SERVER-67068</key>
            <summary>Entries in oplog of admin.$cmd increase in size</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="backlog-server-triage">Backlog - Triage Team</assignee>
                                    <reporter username="vladimirred456@gmail.com">Vladimir Beliakov</reporter>
                        <labels>
                    </labels>
                <created>Tue, 7 Jun 2022 08:16:40 +0000</created>
                <updated>Tue, 6 Dec 2022 00:03:17 +0000</updated>
                            <resolved>Tue, 5 Jul 2022 20:08:49 +0000</resolved>
                                    <version>4.2.17</version>
                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4658693" author="JIRAUSER1257066" created="Tue, 5 Jul 2022 20:08:50 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=vladimirred456%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;vladimirred456@gmail.com&quot;&gt;vladimirred456@gmail.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for following up that the issue has been resolved on your end. I will now close this issue as requested.&lt;/p&gt;

&lt;p&gt;Best,&lt;br/&gt;
Edwin&lt;/p&gt;</comment>
                            <comment id="4607022" author="vladimirred456@gmail.com" created="Fri, 10 Jun 2022 14:08:34 +0000"  >&lt;p&gt;We found that the problem was on our side and we were doing the same big transaction over and over again.&lt;/p&gt;

&lt;p&gt;Please close the issue.&lt;br/&gt;
Sorry for the inconvenience.&lt;/p&gt;</comment>
                    </comments>
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                            <attachment id="383323" name="diagnostic.data.zip" size="23786881" author="vladimirred456@gmail.com" created="Tue, 7 Jun 2022 08:14:03 +0000"/>
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